Abu Dhabi, United Arab Emirates. STANDARD CONSTRUCTION SPECIFICATIONS (PART 1 - ROADS, Second Edition 2020)

Joints shall be filled as soon as practical after compaction, before the termination of each work day,
before acceptance of the day’s work, and before construction traffic is allowed.

Dimensional accuracy, uniformity of joint games, alignment, and squareness of the paver installation
shall be checked by the Contractor after laying the first 3 rows of blocks and at regular intervals
thereafter. If joints begin to open, the blocks shall be knocked together using a rubber or wooden
mallet.

Completed sidewalks shall meet the requirements of the following tolerances, or the Contractor shall
remove and replace, at the Contractor

’s expense, failing areas:

a. Surface level shall be ±5 mm of the design level

b. Maximum deviation within the compacted surface shall be 3 mm or less, as measured with a

3 m straightedge

c. Level of any 2 adjacent blocks shall not differ by more than 1 mm

Exposed paver surfaces shall be washed clean after installation. Prior to final acceptance, any loose,
chipped, broken, stained, or otherwise damaged pavers shall be removed and replaced. New units
that match adjoining units shall be provided and installed by the Contractor in the same manner as
the original units with the same joint treatment.

7.6.7 Tile Sidewalks

Unless  otherwise  shown  or  specified,  tile  installation  for  sidewalks  shall  comply  with  applicable
requirements  of  ANSI  A  108/A  118/A  136.1  and  recommendations  of  the  TCNA  Handbook  for
Ceramic  Tile  Installation,  as  well  as  the  manufacturer's  instructions  for  the  installation  of  each
material required. Tiles shall be furnished and installed as shown on the Contract plans to the lines
and  grades  shown  on  the  Contract  plans,  as  approved  by  the  Engineer.  Colours,  patterns,  and
mosaics of quarry tile shall be as shown on the Contract plans.

Tile sidewalks shall be installed by the Contractor with at least 3 years experience in the installation
of materials comparable to those specified for the project.

Prior to installation of tile sidewalks, the Contractor shall submit the following to the Engineer for
approval:

•

Evidence of the Contractor

’s 3 years of experience, including contact information for the owner

of each project

•

Three samples of each type, class, and colour of tile for each form of construction and finish

•

Detailed shop drawings showing proposed widths, lines, grades, accesses, layout of all field

tiles, trim shapes, jointing patterns, and any other details necessary to properly construct the
work. Contractor shall provide scale details of expansion joints, control joints, special tiles,
frame and service abutments.

•

Test panels, measuring not less than 300 mm on a side, shall consist of a plywood backing

with tile grouted as required for installation in the works using materials indicated for the work.
Engineer

’s approval shall be for colour, pattern, texture and joint width only. Compliance with

all other requirements is the exclusive responsibility of the Contractor

No tiles shall be fabricated nor delivered before approval of shop drawings. Laying tile sidewalks
shall be as follows, unless otherwise directed by the Engineer:

a. Subgrade shall be prepared in accordance with Article 7.6.3.17.6.3.2 and the Contractor shall

ensure that:

1. Substrates for setting tile are firm, dry, and clean and free from oil or waxy films or curing

compounds

2. Grounds, anchors, recessed frames, electrical and mechanical units of work, and similar

items located in or behind tile have been completed before installing tile

ONSTRUCTION

b. Tiles shall be soaked in water a minimum of 30 minutes prior to installation

c. Base shall consist of the following:

1. For quarry tiles, bases shall be a 100 mm thick base slab of Class C15/20 concrete

complying with the requirements of Section 4.3 of Chapter 4, Concrete Works, or as
otherwise shown in the Contract plans

2. For precast tile blocks, bases shall be a 50 mm thick layer of clean coarse sand, 100 %

passing a 6-mm sieve, 0 % to 35 % passing a 0.300 mm sieve and 0 % to 10 % passing a
0.150 mm sieve, shall be spread with water added and compacted to obtain the required
grades before placing the precast concrete blocks

d. Quarry tiles shall be installed in accordance with ANSI A 108.1, except that the mortar bed

shall be 40 mm thick, as indicated on the Contract plans and shall be Class M3 mortar with a
latex additive that meets the requirements of Article 4.3.10.4 of Chapter 4, Concrete Works

e. Mortar bed shall not lay longer than 45 minutes or until mortar begins to set before placing

tiles.

f. Tile shall be laid symmetrically starting at the centre of area and finishing with equally cut rows

on the sides

g. Freshly placed tiles shall be damp cured for a minimum 72 hours prior to grouting

h. Pointing and grouting material shall be the same as for the mortar bed

If necessary, the Contractor may etch substrate with 10 % solution of muriatic acid, if necessary to
remove curing compounds or other substances that would interfere with the proper bond of specified
mortar for tiles. To remove all traces of acid and to seal the substrate with sealer, as recommended
by the manufacture, the Contractor shall rinse the tiles with water.

Tile work shall be laid-out in the pattern and trim shapes as shown on the Contract plans. Tiles shall
form a complete covering without interruptions, except for control and expansion joints as shown on
the Contract plans and as requ

ired to comply with the manufacturer’s instructions. Edges and

corners shall be neat without disruption of pattern or joint alignments. Joint widths shall be uniform.

Where required, tiles shall be cut with approved power saws. Tiles with jagged or flaked edges shall
not be installed. Cutting and drilling of tile shall not mar the surface. Cut tile edges abutting trim,
finish, or built-in items shall be carefully ground to create straight, aligned joints. Tile shall fit closely
around penetrations.

Control or expansion joints shall be provided where shown, or required by ANSI or TCNA standards,
or by job condition for proper workmanship. This process shall be as follows:

1. Install removable divider strip of proper width and depth to include tile and bed

2. Grout tiles and properly cure the work

3. Remove strips and install joint fillers and sealants of the type recommended by the tiling

manufacturer

Upon completion of placement and grouting, tile surfaces shall be cleaned so they are free of foreign
matter. Grout residue shall be removed from tile immediately. Unglazed tiles may be cleaned with
acid solutions only when permitted by the tile and grout manufacturer's printed instructions, but no
sooner than 14 days after installation. Metal surfaces, cast iron, and vitreous plumbing fixtures shall
be protected from the effects of acid cleaning. Surfaces shall be flushed with clean water before and
after cleaning.

Temporary protective coatings shall be removed by methods recommended by the coating
manufacturer and that are acceptable to the brick and grout manufacturer. Coating shall be
discarded in a manner that prevents clogging drains.

Finished installations shall be clean and free of cracked, chipped, broken, unbounded, and otherwise
defective tile work. Final protection and conditions meet the requirements of the manufacturer and
installer to ensure tile is without damage or deterioration at the time of substantial completion.

When recommended by tile manufacturer, the Contractor shall apply a protective coat of neutral
protective cleaner to completed tile walls and floors. Installed tile work shall be protected by the
Contractor with kraft paper or other heavy covering during the construction period to prevent staining,
damage, and wear. Foot and wheel traffic on tiled floors shall be prohibited by the Contractor for at
least 7 days after grouting is completed.

7.6.8 Architectural Concrete Sidewalks

Prior to installation, the Contractor shall prepare a 1-m by 1-m test panel, 75 mm thick, of each
colour, pattern, and texture required for the Engineer

’s approval.

Foundations shall be prepared per Article 7.6.3.17.6.3.2 and as shown on the Contract plans. Screed
concrete shall be placed to the proper grade and wood-float to a uniform surface per Article 7.6.4.1.
Colourant shall be applied by the Contractor

in accordance with the manufacturer’s

recommendations. Stain or colourant shall meet the requirements of Section 7.8.

If a dry-shake colour hardener is used, the Contractor shall apply it evenly to the plastic concrete
surface per the manufacturer’s directions and using at least 30 kg per 10 m

Colours shall be applied in two separate applications and the Contractor shall wood-float the surface
after each application. Trowelling shall occur only after the final floating.

Dyes with a repetitive pattern shall be placed on the concrete surface and hand-tamped to create
the required texture or imprint shown on the Contract plans.

Coloured curing and f

inishing compounds shall be applied in accordance with the manufacturer’s

directions.

7.7 Fencing

7.7.1 Description

This work furnishes, installs, repairs, and replaces fences and gates, complete with hardware and
appurtenances, as shown on the Contract plans, as specified herein, and as approved by the
Engineer. Types and height of fencing shall be shown on the Contract plans. These types include
the following:

•

Chain-link fence, including vinyl coated chain link.

•

Glare screen

•

Wire fence, which may be barbed wire or include woven wire

•

Temporary fence

•

Sand fence

Chain-link and wire fence are typically used as animal/pedestrian barriers along highway right-of-
ways. Wire fence is more generally used for right-of-way fencing in rural areas. Chain link may be
also used for security or vandal protection around public restricted areas.

Glare  screens  typically  consist  of  manufactured  units  and  may  be  of  two  different  general  types.
Type  1  is  a  vertical  blade  type  usually  mounted  to  the  tops  of  traffic  barriers  to  limit  glare  from
oncoming traffic headlights, used for both permanent and temporary detour applications.  Type 2 are
usually  constructed  of  a  small  pattern  sized  diamond-woven  wire  mesh  fence  or  using  chain-link
fencing  with  interlocked  vertical  slats,  manufactured  from  aluminium-,  galvanised-,  or  aluminium-
coated steel that is fabricated and placed to reduce glare from headlights of opposing traffic or other
adjacent  light  sources.  Type  2  glare  screens  can  be  installed  for  both  permanent  and  temporary

applications, and are often used as a combination glare screen and visual barrier for traffic along
work zones.

Sand fences may be of two general types.  Type 1 is a wire fence similar to the wire fence specified
in Article 7.7.3.4, except specifically modified to be used in rural areas as a camel fence.  Type 2 as
specified herein, is a sand trapping fence composed of manufactured units consisting of twisted wire
pairs with interwoven wooden slats specifically designed to trap and help protect the roadway from
drifting, windblown sand.

7.7.2 Materials

All material used in the construction of fences and gates shall be new. Materials shall be durable
and impact resistant, meeting the requirements specified herein, as shown on the Contract plans, or
as may be described in the Particular Specifications and as approved by the Engineer. Iron or steel
material shall be galvanised, unless specified otherwise. Material upon which serious abrasions of
galvanising occurs shall not be acceptable. All fence materials, per each type and application, shall
be provided from a single manufacture as approved by the Engineer.

All materials for the various types of fencing shall comply with the specified requirement of Table
7-34, including coating class, style, fabric, fittings, and hardware. Where there is a conflict between
these Specifications and the referenced specification, the requirements of these Specifications shall
govern.

Table 7-34: Materials requirements for fencing installations

Material

Requirement

Barbed wire

AASHTO M 280

Tension wire

AASHTO M 181

Steel woven fence wire

ASTM A116,

AASHTO M 181,

AASHTO M 279

Fence fittings

ASTM F626 or AASHTO M 232M

Fence posts and framework steel sections
Fence post and framework steel strengths
and coatings

ASTM A702, AASHTO M 181
ASTM F1043, ASTM F1083

Sampling of pipe posts for galvanizing

ASTM A53M

PVC shall mean polyvinyl chloride. GMS shall mean galvanised mild steel.

Approval of fence material shall be by manufacturer’s certificate of compliance, submitted by the
Contractor. This submittal shall include the following information for Engineer

’s approval:

•

Manufacturer’s name

•

Product name and description

•

Manufacturer’s technical data

•

Storage instructions

•

Installation instructions

Contractor shall also provide the following to the Engineer:

a. Shop drawings showing a complete layout plan with posts, bracings, gate, and detail drawings

for all connections

b. Mock-ups, as requested by the Engineer, that includes, at a minimum, a 2-m-length with typical

gate hardware and connections

Samples shall be supplied by the Contractor, as requested by the Engineer, and shall include, at a
minimum, the following:

1. Mesh measuring 300 mm by 300 mm

2. Line wire measuring 300 mm long

3. Tying wire measuring 300 mm long

4. Stirrup wire measuring 300 mm long

5. Barbed wire measuring 300 mm long

6. Fence fittings measuring 300 mm long

7. Post and brace of each type

Manufacturer shall be a company specialised in production of the fencing type required, with
minimum of 5 years experience.

7.7.2.1

Chain-link Fence

a. Post Material for Chain-link Fence

Except as noted otherwise, base metal for the manufacturing of posts and braces shall comply with
the requirements of AASHTO M 181, Type I zinc-coated steel, Grades 1 or 2; and shall include all
round and roll-formed material, including brace rails, top rails, line posts, brace posts, end posts,
corner posts, and pull posts

— except that the carbon content of steel posts shall not be more than

0.4 %. Steel made by the oxygen furnace process will be acceptable.

Grade 1 post material shall conform to the weight per linear foot, minimum wall thickness and detail
requirements  of  ASTM  F1043.  Grade  1  post  material  that  exceeds  the  maximum  wall  thickness
requirement  of  ASTM  F1043  may  be  accepted,  provided  it  does  not  interfere  with  the  proper
construction of the fence.

Grade 2 post material shall meet the organic exterior coatings requirements of AASHTO M 181,
Section 33; and the additional requirement that the interior coated surface shall be capable of
resisting 300 hours of exposure to salt fog with a maximum of 5 % red rust when tested in accordance
with ASTM B117.

Round post material shall be either Grade 1 or 2.

Roll-formed post material shall be Grade 1. Roll-formed end, corner, and pull posts shall have
integral fastening loops to connect to the fabric for the full length of each post. Top rails and brace
rails shall be open, rectangular sections with internal flanges as shown in ASTM F1043.

Posts and braces shall additionally comply with the following requirements, unless otherwise
indicated on the Contract plans.

Table 7-35: Chain-link post requirements

Location

Type

Minimum size of the

greatest dimension

(mm)

Minimum wt per linear

metre (kgs)

End, corner, pull, and gate
posts

Pipe

60.3 OD

5.43

Line posts

Pipe

48.3 OD

4.05

Braces (struts)

Pipe

42.2 OD

3.38

OD = outside diameter

Post-types used shall be the same on any one project.

Posts shall have provisions to securely hold the top tension wire in position and allow for removal
and replacement of a post without damaging the top tension wire. Tubular posts shall be fitted with
rain-proof tops.

Extension arms, stretcher bars, and other required fittings and hardware shall be steel or malleable
iron, or wrought iron, and shall be hot-dipped galvanised.

b. Post Caps for Chain-link Fence

Malleable iron, or plastic, post caps designed to exclude all moisture shall be provided for each post.
If the Contract plans show barbed wire, the Contractor shall furnish barbed wire support arms integral
with the post caps. If a top rail is shown on the Contract plans, the Contractor shall furnish post caps
with an opening for the top rail. Post caps must have a 50 mm skirt.

c. Chain-link Fence Fabric

Chain-link fence fabric shall consist of galvanised steel wire that complies with AASHTO M 181 and
as shown on the Contract plans. Base metal shall be hot-dipped galvanised steel wire. Wire used in
the manufacture of the fabric shall be 4.88 mm for all fence fabric. Wire shall be woven into 50 mm,
±2 mm, diamond mesh. Width, top, and bottom finishes of the fabric shall be as specified in AASHTO
M 181.

Tie wires and post clips shall be at least 3.76 mm galvanised steel.

Turnbuckles and truss tighteners shall be fabricated of commercial quality steel, malleable iron, or
wrought iron, and shall be hot-dipped galvanised. Truss tighteners shall have a strap thickness of
not less than 6 mm.

Portland cement concrete shall be used for metal post, brace foundations, and deadmen; and shall
comply with the requirements of Section 4.3.1 of Chapter 4, Concrete Works, for Class C20/20
concrete.

d. Gates for Chain-link Fence

Gates shall be of the sizes shown on the Contract plans, and gates wider than 2.45 m shall have a
vertical member installed at the midway point of the gate.

Gate frames shall be constructed of not less than 38 mm internal diameter, hot-dipped galvanised
pipe  conforming  to  AASHTO  M  181  Type  I,  Grades  1  or  2.  Corners  of  the  gate  frame  shall  be
fastened  together  and  reinforced  with  a  malleable  iron  or  pressed-steel  fitting  designed  for  the
purpose.  They  may  also  be  welded  in  conformance  to  the  requirements  of  Sections  23.4.11  and
23.6.10  of  Chapter  23,  Steel  Structures.  Paint  shall  be  applied  in  conformance  to  the  applicable
requirements of Chapter 24, Painting.

Each gate shall be furnished complete with necessary hinges, latch, and a drop bar locking device
designed  for  the  type  of  gate  posts  and  gate  used  on the  project. Gates  shall  have  positive  type
latching  devices  with  provisions  for  padlocking.  Hinges,  latches,  and  locking  devices  shall  be
galvanised. Locks shall be supplied for each gate.  Three sets of keys shall be provided for all locks.

Gates fabricated from round sections of pipe of the size and weight shown on the  Contract plans
shall  be  provided  by  the  Contractor.  These  materials  shall  meet  ASTM  F1083  for  all  gate  pipes.
Chain-link fence fabric for filling the gate frame shall meet the requirements of Sub-article c, of Article
7.7.2.1, for the fence type being furnished. Cross trussing shall consist of 9-mm steel adjustable rods
that have been galvanised. Chain-link fence fabric specified for the fence shall be attached to the
gate frame by the use of stretcher bars and the tie wires, as specified for fence construction. Suitable
tension connectors shall be spaced at approximately 300 mm intervals. For each gate, the Contractor
shall include the following:

1. Corner and tee fittings of malleable iron or pressed steel with means for attaching diagonal

bracing members

2. Hinges of malleable iron allowing a full 180° swing, easily operated by one person

3. Ball-and-socket-type bottom hinges that do not twist or turn from the action of the gate and

prevent the closed gate from being lifted off the hinges

4. A positive stop that prevents any portion of the gate from swinging over an adjacent traffic lane.

5. At least 2 steel, or malleable iron, hinges not less than 80 mm in width to hang the gate, so

designed as to securely clasp to the gate post and permit the gate to be swung back against
the fence

6. A malleable iron pulley system for roll-type gates, when required.

7. Diagonal braces consisting of 9-mm-diameter cable with turnbuckles, 2 to each gate frame;

and, for vehicle gates, a vertical pipe brace of the size and weight shown on the Contract plans
at the centre of each gate leaf

8. Latches of malleable iron or steel for single gates with a single-fork latch and padlock eye that

will keep the gate closed

9. Heavy-duty padlocks acceptable to the Engineer and master-keyed. Padlocks shall be a 51

mm, Type EPC, 5-pin tumbler mechanism, brass or bronze, solid case, with chain, unless
otherwise directed by the Engineer

10. Two fork latches mounted on a centre plunger rod with a padlock eye for double-leaf gates

11. Holdbacks for each leaf of vehicular gates, with a semi-automatic holdback catch anchored

at least 300 mm into a 300 mm diameter by 600-mm-deep concrete footing and a malleable
iron centre rest, designed to receive the plunger rod anchored as shown on the Contract plans
for all double-leaf gates

Gate frames constructed of steel sections, other than pipe, that are fabricated in such a manner as
to form a gate of equal or better rigidity may be used, provided they are approved by the Engineer.

e. Tension Wire for Chain-link Fence

Tension wire shall meet the requirements of AASHTO M 181. Tension wire galvanising shall be
Class 1.

f. Fittings and Hardware for Chain-link Fence

Except where indicated, fittings shall be malleable cast iron or pressed steel and shall conform to
the requirements of ASTM F626 or AASHTO M 232M, whichever is applicable. Fittings for any
particular fence shall be those furnished by the manufacturer of the fence.

Tension  truss  rods  shall  be  9.5  mm  round  galvanised  rods  with  drop-forged  turnbuckles  or  other
approved  type  of  adjustment.  Truss  tighteners  shall  have  a  strap  thickness  of  at  least  6.35  mm.
Couplings for tubular sections shall be outside sleeve type and shall be at least 150 mm long.

Eye-bolts for attaching tension wire shall be 9.5 mm diameter and of sufficient length to fasten to the
type of post being used. Tension bars shall be 4.76 mm by 19 mm nominal and cross sectional area
shall be 90 mm

±5 %.

Hog rings shall be 2.68 mm galvanised steel wire. Tie wire shall be 3.76 mm galvanised steel wire
or 3.76 mm aluminium wire meeting the requirements of ASTM F626.

Structural bars, stretcher bar bands, post caps, and miscellaneous hardware shall be fabricated from
commercial quality steel and shall be zinc-coated in accordance with the requirements of AASHTO
M 111M. Stretcher bars shall be 4.76 mm by 19 mm steel flat bars. Stretcher bar bands shall be 3.2
mm by 25.4 mm preformed steel bands.

Barbed  wire,  for  use  with  chain-link  fence,  shall  conform  to  the  requirements  of  Sub-article  e,  of
Article 7.7.2.3, of these specifications. Barbed wire support arms shall be of the type shown on the
Contract  plans,  shall  be  fabricated  from  commercial  quality  steel,  and  shall  be  zinc-coated  in
accordance with the requirements of AASHTO M 111M. Barbed wire shall be as specified on the
Contract  plans,  typically  3  strands  of  twisted  2.51  mm  barbed  wire  with  4-point,  2.03  mm  barbs

ONSTRUCTION

spaced approximately 125 mm, conforming to ASTM A121. Support arms typically extend at an
angle of 45° from vertical, with clips for attaching 3 strands of barbed wire to each support arm and
sufficient strength to support a 90 kg weight applied at the outer strand.

Contractor shall install grounding rods consisting of copper-clad steel rods at least 2.5 m long, with
a minimum diameter of 16 mm, or other ground rod approved by the Engineer.

All necessary quantities of fittings and fasteners shall by furnished by the Contractor in sufficient
quantities to erect all fencing materials in a proper manner. Fittings for posts shall be form-pressed
or rolled steel, forged steel, malleable iron or wrought iron of good commercial quality, and spaced
as shown on the Contract plans.

g. Chain-link Fence Coatings

Where shown on the Contract plans, or required in the Particular Specifications, posts, gate frames,
rails, bracings, clamps, accessories and similar materials shall have a vinyl coating thickness of
0.254 mm to 0.356 mm.

Fabric shall have a vinyl coating thickness over the galvanised substrate as per AASHTO M 181.

Vinyl coating shall be continuously extruded, not sprayed or dipped, over the galvanised steel wire
by the thermal extrusion process under 352 kg/cm

(34 MPa) pressure to ensure a dense and

impervious covering free of voids, having a smooth and lustrous surface appearance.

Wire shall be vinyl-clad before weaving and shall be free and flexible at all joints.

Plasticised PVC with a low temperature -20° C, consisting of plasticiser with no fillers, extenders, or
extraneous matter other than the necessary stabilisers and pigments shall be used. Colours shall be
stabilised and have a light fastness that shall withstand a minimum Weather-O-Meter exposure of
10,000 hours without any deterioration per ASTM D1499, E 42, Type E.

In addition to the requirements above, Vinyl-clad wire shall meet the material requirements of Table
7-36.

Table 7-36: Requirements for vinyl coating for chain-link wire

Property

Requirement

Accelerated aging test: 10,000 hours at 62° C

No cracking or peeling

Character

Self-extinguishing

Insulation

12,000 volts

Tensile strength

190 kg/cm

Elongation

275 %

Specific gravity

1.30 maximum

Hardness

At least Durometer A-90, ±5

Abrasion resistance

High

U.L. Test for abrasion at 120° C under 500 g load 15 % maximum deformation

Compression cut through (Bell Laboratory Test) 105.5 kg/cm

Vinyl coatings shall, in addition, resist attack from prolonged exposure to dilute solutions of most
common mineral acids, sea water, and dilute solutions of most salts and alkalis.

Pipe coating materials shall meet the material requirements of Table 7-37.

Table 7-37: Requirements for pipe coating materials

Property

Requirement

Specific gravity

1.32 maximum

Tensile strength

105.5 kg/cm

minimum

Elongation

200 %

Tear strength

381 microns = 2.4 kg

Hardness of coating

At least 80 Shore A Durometer, ±v5

Dielectric strength

1,000 volts per mil

Volume resistivity

2.0 ohm/cm by 1012 ohm/cm

Brittle temperature

-20° C (film)

Water absorption

at 25°C, one week

at 94°C, 2 hours

0.70 % maximum

0.95 % maximum

Resin formulation shall meet the standard 3,000-
hour Weather-O-Meter requirement

No cracking, blistering, or loss of adhesion

Impact resistance test, Gardner test method

185 cm/kg minimum

Certified abrasion resistance: withstand at least

10-minute blast, at 5.6 kg/cm

, at 305 mm, at 25°

C with S230 shot at an impingement angle of 90
degrees

Steel substrate shall not be exposed

Salt spray test (Federal Test standard 141

–

Method 6061)

For scored samples after exposure of 1,000
hours

10,000  hours  minimum  with  no  perceptive
deterioration to  coating or  evidence  of  metal
corrosion for unscored samples.

Undercutting shall not exceed 5 mm

Prolonged exposure at 24° C to fuses

Exhibit chemical resistance

Resist attach from prolonged exposure to dilute
solutions of mineral acids, sea water, and most
salts and alkaline

All damaged areas of the coating shall be repaired in accordance with the coating

manufacturer’s

instructions.

All fasteners, including nuts, bolts, washers, shall be stainless steel of Type 316 or A4.

All hardware, including latches and hinges, shall be GMS.

h. Motorised Gates and Accessories

1. Horizontal Sliding Type

Gates shall have a minimum clear width of 7.3 m and 1.0 m for vehicular and pedestrian
entrances, respectively, and a height to match the fence height as shown on the Contract
plans.

Frame, verticals, and bracings shall be of mild steel (MS) hollow sections, as detailed in the
Contract plans. After fabrication, MS sections, accessories, and other components shall be
hot-dipped galvanised. Finished fabricated products shall be painted using a system per
applicable specifications in Section 24.4 of Chapter 24, Painting, with an approved quality
primer and enamel paint, black in colour, or as otherwise shown on the Contract plans.

Motorised gates shall be remote-controlled and horizontally sliding. Systems shall be suitable
to be operated under a local power supply system 220/415 V, 50 Hz. Assembly shall consist
of photo-electric cells and the pressure switches connected together in series with contacts
normally closed for remote operation. Assembly shall include the following:

i. Heavy gauge steel frame for pad mounting.

ii. All-weather hinged covers with provision for padlocking

iii. Adjustable safety friction clutch.

iv. Adjustable limit switches, rotary type

v. Magnetic solenoid locking brake

vi. Emergency disconnect for manual operation in case of power failure

vii. Magnetic reversing starter, of size 1 contactor type, with overload and under voltage

protection.

viii. Factory prewired electrical system

ix. Permanent lubricated heavy-duty bearings and heavy-duty roller chain

x. Removable hood for the motor.

xi. Operator shall be suitable to withstand the local weather conditions IP54.

xii. Motor shall meet the international standards, IEC, and shall be suitable for remote

operation

xiii. Electric gate operator shall include electric gate operator to be located as indicated on

the Contract plans. Operator shall have parallel 3-button illuminated control stations for
open, stop, and close. Electrical conduit, switches, wiring, and connections specified
under the applicable electrical sections shall be provided

xiv. Pedestrian gates shall be of manually operated type

xv. Padlock with 3-sets of master keyed keys for each gate.

2. Stop Bar

Stop  bars,  or  traffic  barriers,  shall  be  designed  for  a  100  %  duty  cycle.  Barriers  shall  be
equipped with a torque motor that lifts the boom arm through a sinusoidal level system that
allows  the  boom  arm  to  be  locked  in  both  the  up  and  down  positions.  All  the  electronic
equipment shall be manufactured to ISO 9002 standards. Boom arms shall lift up to at least
85°  in  the  event  of  power  failure.  At  least  4  tension  springs  shall  be  available  for  counter
balancing.  Left-  and  right-hand  barriers  shall  be  provided,  as  required,  with  round  or
octagonal boom arms. Barriers shall be design to require minimum maintenance.

Boom arms shall be available to at least 6 m long and made from extruded aluminium tubing
powder-coated in white with red reflective tape. Boom arms shall be joined to the boom
adapter so that the attachment will sheer in case of accidental collision and prevent damage
to the barrier and boom arm. Jack knife kits shall be provided, if required, for height restricted
areas for up to 4.5 m boom arms.

Left- and right-hand boom arm configurations shall be available. Rubber buffers shall be used
for dampening on the down position to eliminate bouncing. A minimum 60 w, 220 v AC, 50
hz motor gear box shall be provided, and shall include 100 % duty cycles. An instant reverse
torque drive motor with a minimum design operating temperature of 50° C shall be provided.
Booms shall open to 90° under power and at least 85° on power failure.

Cabinets shall be an IP54 enclosure, manufactured from a minimum 1.6-mm 3CR12 stainless
steel. Cabinets shall be powder-coated in any RAL colour selected by the Engineer.
Operating speeds shall be from 2 seconds to 4 seconds from horizontal to vertical position.

ONSTRUCTION

Modular electronics with plug-in attachments shall be used for control. Large, lockable,
hinged doors shall be provided for easy access.

7.7.2.2

Glare Screens

Glare screens may be of two types, as shown on the Contract plans and as discussed below.

a. Type 1: Glare screen shall consist of a multipiece vertical blade delineator system used along

medians. They are the type positioned on the top of median barriers to create a visual shield
for the length of the median. They can be used for both temporary detours and permanent
medians. Salient features of the Type 1 glare screens shall be as follows:

1. Modular, with components consisting of a vertical blade, base and horizontal base rails.

Vertical blades shall be of sizes as shown on the drawing, but typically are available in 60
mm through 1000 mm heights.

2. Durable manufactured of impact resistant, non-metallic polymeric materials. All materials

shall  be  new.  Blade,  base  and  rail  shall  have  sufficient  strength  to  withstand  5  impacts
beginning with 15 mph and progressing through 25, 35, 45 and 55 mph respectively.  Device
used for impacting the glare screen shall be a horizontal steel bar with a 400 mm by 60 mm
plastic  covered  steel  plate  attached  to  simulate  truck  bumpers,  trailers  and  wide  or
overhanging loads.  Lowest point of impact by the steel plate will be 250 mm above the top
of the barrier wall.  After 5 impacts all blades shall remain attached to the system, stand
erect, be serviceable, and exhibit no delaminating or cracking.

b. Type 2: Visual barrier fence which can also be installed on concrete barriers and steel

guardrails or in standalone installations. They are typically used for curved roadways, access
ramps, raised highways and construction lanes. Glare screen fence types and sizes shall be
as shown on the Contract plans, but are typically of the general types as follows:

1. Style A: Woven wire panels with approximately a 25 mm diamond wire mesh.

2. Style B: Chain-link fencing with vertical wood or plastic material slats.

3. Alternate manufactured fence panel type as may be approved by the Engineer.

All material used in the construction of the fence shall be new. Iron or steel material shall be
galvanised or aluminium-coated, as specified. Imperfectly galvanised or aluminium-coated material,
or material upon which serious abrasions of galvanising or aluminium coating occur, will not be
acceptable.

Glare screen fence fabrics for Style A and Style B fences shall consist of diamond-woven wire mesh.
Fabric wire shall be 3.76 mm iron or steel wire that shall meet all of the requirements of ASTM A392
galvanised or ASTM A491 for aluminium-coated, except that galvanising of the Style B glare screen
fabric shall be not less than 305 g/m

and shall be done before weaving. Aluminium coating shall be

Class II.

Style A glare screen mesh size shall be approximately a 25 mm diamond. Style B glare screen mesh
size shall be a maximum of 90 mm vertical and 140 mm horizontal. Design of the Style B shall permit
the slats to be installed in a vertical position, as shown in the Contract plans without distortion of the
slats.

All fencing materials for the Type 2 glare screen fences shall meet the applicable requirements of
Article 7.7.2.1 for chain-link fencing. Vertical slat materials for the Style B glare screen fence shall
meet the following requirements:

1. Wood slats shall be 10 mm by 60 mm by the height designation of the fence. Material shall be

finished and treated and shall be free from loose knots, cracks, or other imperfections. A
dimensional tolerance of ±1.5 mm in width or thickness is allowed provided that the maximum
space between slats does not exceed 19 mm.

2. Plastic slats shall be 10 mm by 60 mm by the height designation of the fence. They shall be

manufactured from tubular polyethylene colour pigmented material consisting of high-density

virgin polyethylene and colour pigments, designed to retard ultraviolet penetration. These
materials shall have a minimum wall thickness of 0.076 mm, ±0.0076 mm, and shall remain
flexible without distortion and without becoming brittle through a temperature range of -57º C
to +121º C. Tensile strength shall be at least 24,820 kPa and the melt index shall not exceed
0.25.

Plastic slats shall be retained in place by means of U-shaped retainer members at the bottom
and top of the fence. Retainer members shall be of the same material as the slats. Colour for
plastic slats will be approved by the Engineer from samples submitted by the Contractor or
supplier.

7.7.2.3

Wire Fence

Wire fence materials shall conform to the requirements of Article 7.7.2.1. All materials used in the
construction of the wire fence shall be new. All iron or steel material shall be galvanised. Material
upon which serious abrasions of galvanising occur will not be accepted. Materials shall be accepted
based on manufacturer’s certificate of compliance.

a. Steel Post for Wire Fence

Round post material shall conform to AASHTO M 181, Type I, Grade 1.

All angle post material shall be hot-dipped galvanised in accordance with the requirements of
AASHTO M 111M, Grade 75. Galvanising shall be 541 ml/m

of surface area. Angle posts used for

end, corner, gate, and pull posts and braces shall have a minimum weight of 4.6 kg/m.

Posts shall be not less than 2 m in length. A tolerance of -5 % on the weight of individual posts,
braces or anchor plates will be permitted. One type of line post shall be used throughout the project.
Line posts shall be studded, slotted, or properly adapted for attaching either wire or mesh in a manner
that will not damage the galvanising of posts, wire, or mesh during the fastening. Line posts shall
have a minimum weight of 2 kg/m and shall be provided with a tapered galvanised steel anchor plate.
Anchor plates shall be securely attached and have a surface area of 500, ±50 mm

, a minimum

weight of 0.3 kg and 541 ml/m

galvanising. Only new steel shall be acceptable. Rerolled or open

seam material shall not be used.

When painting is specified, the Contractor shall use an approved anticorrosive coating per applicable
requirements of Section 24.3 of Chapter 24, Painting. After the installation of painted posts and
braces, the Contractor shall spot-coat damaged areas with the same paint colour using paint with at
least the same anticorrosive properties as the original paint. Size, weight, and area of posts, braces,
and anchor plates shall be as shown on the Contract plans.

b. Wood Posts and Braces for Wire Fence

Outer bark and all inner cambium bark shall be removed by the Contractor from treated posts;
however, occasional strips of bark may remain if not more than 13 mm wide or more than 75 mm
long. Only sound timber that is free from decay, shakes, splits, or other defects that can weaken the
posts or braces, or otherwise make them structurally unsuitable for the purposes intended, shall be
used. Knots that are sound, tight, trimmed flush, and not in clusters will be allowed, provided they
do not exceed one-third of the small diameter or the least dimension of the posts and braces. Spurs
and splinters shall be removed and the ends cut square.

All wood posts and braces shall be treated.

Before use all materials shall be of good quality and approved by the Engineer. Peeler cores shall
not  be  used  for  round  posts.  Wood  fencing  materials  shall  have  sufficient  sapwood  in  the  outer
periphery to obtain the specified penetration of preservative. Fencing materials shall  be cut to the
correct length before pressure treatment.

Line posts shall be 75-mm, minimum diameter round posts or nominal 75-mm by 75-mm square-
sawed posts. If the posts are to be pointed for driving, they shall be pointed before treatment. Line

posts shall be at least 2 m in length. Pull posts and brace posts shall be 150-mm-diameter round
posts or nominal 150-mm by 150-mm material not less than 2 m long.

End, gate, and corner posts, and posts at an intersecting fence, shall be 150-mm-diameter round
posts or nominal 150-mm by 150-mm material not less than 2.4 m long.

Preservatives used to pressure-treat wood fencing materials shall meet the requirements as shown
on the Contract plans or as approved by the Engineer. Minimum penetration of preservative shall
consist of the following:

•

For material 125 mm or less: 10 mm penetration and 90 % of sapwood

•

For material 125 mm or greater: 13 mm penetration and 90 % of sapwood

Retention of the preservative shall be per Table 7-38.

Table 7-38: Minimum retention in kilograms per m3

Preservative

Sawed Posts

Round Posts

Creosote

160.0

128.5

Pentachlorophenol

8.0

6.4

ACA

6.4

ACZA

6.4

CCA

6.4

c. Brace Wire for Wire Fence

Brace wire shall be 3.76-mm wire galvanised to meet the requirements of AASHTO M 279, Type Z,
Class 1.

d. Staples and Wire Clamps for Wire Fence

Staples used to attach the wire fencing to wood posts shall be 3.76 mm, 38 mm long, galvanised to
meet the requirements of AASHTO M 279, Type Z, Class 1. Wire clamps used to attach the wire
fencing to steel posts shall be 3.06 mm wire, galvanised to meet the requirements of AASHTO M
279, Type Z, Class 1.

e. Barbed Wire Material Requirements

Barbed wire shall be furnished by the Contractor where shown on the Contract plans, as approved
by the Engineer. Typical installations shall be per ASTM A121, Class 1, consisting of 3 strands of
2.51-mm gauge wire, twisted with 4-point, 2-mm barbs spaced 125 mm apart, at most.

f. Barbless Wire Material Requirements

Barbless wire shall meet the same requirements as barbed wire, except that the barbs shall be
omitted.

g. Wire Mesh Material Requirements

Wire mesh shall conform to the requirements of AASHTO M 279, Type Z, and shall consist of 8
horizontal wires with vertical stays spaced 300 mm apart. Top and bottom wires shall be 3.43 mm,
and the intermediate wires and vertical stays shall be 2.51 mm. Mesh shall have a total width of 0.8
m and a height as shown on the Contract plans.

Galvanising  shall  be  Class  3.  Zinc-coated  wire,  as  represented  by  the  test  specimens,  shall  be
capable  of  being  wrapped  in  a  close  helix  at  a  rate  not  exceeding  15  turns  per  minute  around  a
cylindrical steel mandrel having a diameter the same as the specimen being tested, without cracking
or  flaking  the  zinc  coating  to  such  an  extent  that  any  zinc  can  be  removed  by  rubbing  with  bare
fingers.

h. Vertical Cinch Stays for Wire Fence

Vertical cinch stays shall be 3.6 mm galvanised wire meeting the requirements of AASHTO M 279,
Type Z, Class 1. Minimum weights for zinc coating shall be 92 g/m

of uncoated wire surface. Tie

wires, hog rings, and post clips shall be zinc-coated steel of good commercial quality and shall be of
the same gauge as the fence fabric being fastened.

i. Miscellaneous Hardware for Wire Fence

Galvanised bolts, nuts, washers, braces, straps, and suitable devices for holding barbed wire and
wire mesh firmly to metal posts shall be used. Bolts, nuts, hinges, latches, and other miscellaneous
hardware shall be galvanised in accordance with AASHTO M 232M.

j. Wire Gates

Gate frames shall be constructed of galvanised pipe with a nominal diameter of not less than 25 mm.
Pipes shall conform to the requirements of AASHTO M 181 Type I, Grade 1. Wire gates shall be not
less than 1.2 m in height and shall be designed to fit openings of the widths called for in the Contract
plans. Each gate shall be provided with 2 upright braces of the same material as the frame, spaced
at quarter points in the gate. All gates shall be provided with adjustable 8-mm-diameter galvanised
diagonal truss rods from corner to corner.

Gate frame shall be provided with wire mesh conforming to the requirements specified in Sub-article
g, of Article 7.7.2.3, except that it shall consist of 10 horizontal wires and have a total width of 1.2 m.
Each gate shall be furnished complete with necessary galvanised hinges and latches designed for
use with the type of gate posts used on the project. Hinges shall be so designed as to be securely
attached to the gate post and to enable the gate to swing back against the fence. Double gates shall
be hinged in the same manner as single gates and shall be provided with an approved galvanised
drop-bar locking device. Galvanising for hinges, latches, and locking devices shall be in accordance
with AASHTO M 232M.

Gates greater than 1.5 m wide shall have a vertical member installed at the midway point of the gate.
Gates  shall  be  hung  by  at  least  2  steel,  ductile  iron,  or  malleable  iron  hinges,  so  designed  as  to
securely  clamp  to  the  type  of  gate  post  furnished  and  permit  the  gate  to  swing  back  against  the
fence. Gates  shall  be  provided  with  a  combination  steel,  ductile  iron,  or malleable  iron  catch  and
locking  attachment  that  will  not  rotate  around  the  latch  post.  Stops  to  hold  gates  open  shall  be
provided, where required.

7.7.2.4

Temporary Fencing

The  Contractor  shall  furnish,  install,  maintain  and  remove  temporary  fencing  at  existing  utilities,
services,  along  detour  roads,  as  required  for  safety  of  the  public,  as  specified  herein  and  where
directed by the Engineer.

Temporary fencing shall consist of wood fence posts a minimum of 1.5 m in length and with a
minimum cross-sectional dimension of 75 mm in any direction, set 600 mm into the ground at 3 m
on centres, and end struts or braces, as required. Steel fence posts may be substituted for wood, if
approved by the Engineer.

Two strands of approved, brightly coloured utility type plastic warning tape shall be stapled to the
wood fence posts at the top and at mid-height in a taut and workmanlike manner.

7.7.2.5

Sand Fences

Sand fences may consist of one of two types, and shall be supplied and constructed as shown on
the Contract plans, and as described below:

a. Wire fences used as camel fences: Camel fences shall meet the material and construction

requirements of Article 7.7.3.4 as modified by the following items:

1. Line wires: 16 nos. line wires, 3.15 mm dia., to every post with tensile strength of 1200

N/mm

and galvanized according to AASHTO M 279, Type Z, Class 1.

2. Straining, start, end and corner posts: Metal posts having IPE 120 section, 3000mm long,

hot dip galvanized to  BS EN ISO 1461. Straining posts are installed at maximum 300 m
centers.  Start, end and corner posts are installed at the locations described in Sub-article
a, of Article 7.7.3.4.

3. Intermediate (line) posts: Metal posts having IPE 80 section, 2900 mm long and Article

7.7.3.4. Intermediate posts are provided at every 7.5 m centers.

4. Struts (braces): Struts for straining and end posts are of IPE 80 sections and are 3000 mm

long, hot dip galvanized to BS EN ISO 1461.

5. All post and strut foundations shall be concrete bedded in accordance with Article 7.7.3.2.

6. Dropper bars:

11 nos. dropper bars per bay of 7.5 m to keep the line wires in place.

Droppers shall have aluminium clips to connect the bars to the line wires.

b. Sand control fences used for trapping windblown sand: Sand control fences shall be supplied

and constructed as shown on the Contract plans and as approved by the Engineer. Sand
control fences shall be a provided from a single manufacturer with the posts, wire and vertical
slats acting as a single system. Sand control fence shall be comprised of support posts, wire,
wood slats woven into the wire tension strands, fittings, braces, and all necessary hardware.
Approved sand control fences shall meet the following requirements:

1. Overall above ground height of the fence shall be approximately 2 m.

2. Porosity of the fence system (open space between the vertical slats) to be within 40 to 60

% of the frontal fence area.

3. Slats composed of durable wood, treated against insects, with sizes approximately 1.8 m

by 40 mm by 10 mm. Slats shall be evenly spaced and fixed into the wires by twisting each
tension wire pair around each slate and fixed with a galvanized steel staple. Each twist
shall be not less than two 360

twists of the wire in the weave between the slats.

4. Galvanised steel tension wires galvanized according to AASHTO M 279, Type Z, Class 1,

gauge 12 or larger, having minimum tensile strength of 1200 N/mm

. Tension wires shall

consist of a minimum of 4 no., 2-wire pairs spaced evenly over the height of the fence.

5. Post shall be carbon steel pipes, hot dip galvanized to BS EN ISO 1461, 50 mm dia. 3 m

long, placed 3 m apart, with a 4 mm wall thickness, Posts shall be have suitable wire
attachment provisions meeting the requirements of Sub-article a, of Article 7.7.2.3.

7.7.2.6

Animal Grid

The  Contractor  shall  furnish,  place,  and  construct  animal  grids  in  accordance  with  these
specifications and  requirements of  BS 4008:2006 and conforming to the details, dimensions, and
locations shown in the Contract plans.

The Contractor shall provide shop drawings for the Engineer’s approval prior to construction of the
animal grid.

Unless otherwise specified, all structural steelwork shall be Grade S275 conforming to BS EN 10025,
and shall be galvanized in accordance with BS EN ISO 1461:2009.

Unless otherwise specified, all bolts shall be Grade 4.6 conforming to BS 3692:2001.

Unless otherwise specified, all welds shall be in accordance with BS EN 1011-1:2009, BS EN 1011-
2:2001, and BS EN 1011-8:2004.

Concrete and steel reinforcement for use in animal grids shall meet the applicable requirements of
Chapter 4, Concrete Works, and Chapter 5, Reinforcing Steel, of these standard specifications.

ONSTRUCTION

7.7.3 Construction Requirements

7.7.3.1

General

Fence lines shall be cleared of all trees, brush, logs, up-turned stumps, roots of downed trees,
rubbish, and debris. Minor irregularities in the path of the fencing shall be levelled-off.

Clearing width shall be approximately 3 m, or as shown on the Contract plans or approved by the
Engineer.

Grubbing will not be required, except where short and abrupt changes in the ground contour will
necessitate removal of stumps to properly grade the fence line. Any high points that interfere with
the placing of fence fabric shall be excavated to provide the clearance shown on the Contract plans.
All stumps within the clearing limits shall be removed or close cut. Grading of the fence line shall be
sufficient enough to prevent short and abrupt breaks in the ground contour and improve the aesthetic
appearance of the top of the fencing when installed. It is expected that in the performance of this
work, machine operations will be required for chain-link fencing, and handwork will be required for
wire fencing

— except where sufficient widths exist for machine work.

Fences shall be constructed close to and inside the ROW line unless otherwise directed by the
Engineer or shown in the Contract plans. Deviations in alignment to miss obstacles will be permitted
only when approved by the Engineer and only when such deviations will not be visible to the travelling
public or adjacent property owners.

Damaged fences or gates shall be repaired or replaced by the Contractor. If posts cannot be repaired
by straightening, the Contractor shall remove and replace the post and foundation. When a fence
installation  is  to  be  removed  in  its  entirety  and  not  replaced,  the  Contractor  shall  return  all
salvageable  material  to  the  location  shown  in  the  Contract  plans  and  backfill  all  postholes  with
suitable material.  Salvaged fence  fabric shall  be returned  to the  Owner  in  secured  rolls  not more
than 15 m long. Unsalvageable materials shall be disposed of by the Contractor.

7.7.3.2

Chain-link Fence and Gate Construction

All gates, corners, and end posts shall be fitted with tops designed to fit securely over the posts. A
top rail shall be fastened to the side of the gate posts, corners, and end posts; and, on the top of the
line posts by steel or malleable iron or wrought iron fitting, galvanised, at each connection

— all in

accordance with the detail indicated on the Contract plans. All required fittings and hardware shall
be fastened to the posts in the proper manner.

Changes in line where the angle of deflection is 15 degrees or more shall be considered corners and
shall require the installation of corner posts. Post spacing and placement shall conform to the
requirements of Table 7-39.

Table 7-39: Post spacing and placement for chain-link fence

Post type

Required spacing or placement

Line posts

3 m maximum interval

Pull posts

50 m maximum interval
At each change in direction exceeding 20

vertically

Corner posts

At each horizontal angle point exceeding 15

At line changes amounting to 600-mm tangent offset or more
between posts

Post spacing shall be measured from the centre of one post to centre of the next, and shall be parallel
to the slope of the natural ground. All posts shall be placed in a vertical position. In unusual locations,
the posts shall be set perpendicular to the ground surface, as approved by the Engineer.

All posts shall be set in concrete footings that comply with the details shown on the Contract plans
and crowned at the top to shed water. Concrete footings shall consist of Class C25/20 concrete and

Abu Dhabi, United Arab Emirates. STANDARD CONSTRUCTION SPECIFICATIONS (PART 1 - ROADS, Second Edition 2020) - page 48