Standard Specifications for Road, Bridge, and Municipal Construction 2020 (M 41-10)

Concrete Barrier

6-10

The barrier shall be precast in sections as the

require. All barrier in the

same project (except end sections and variable length units needed for closure) shall be
the same length. All barrier shall be new and unused. It shall be true to Plan dimensions.
The manufacturer shall be responsible for any damage or distortion that results
from manufacturing.

Only one section less than 20 feet long for single slope barrier and 10 feet long for all
other barriers may be used in any single run of precast barrier, and it shall be at least 8
feet long. It may be precast or cast-in-place. Hardware identical to that used with other
sections shall interlock such a section with adjacent precast sections.

Barrier connection voids for permanent installations of precast single slope barrier shall
be filled with grout.

6-10.3(2) Cast-In-Place Concrete Barrier

Forms for cast-in-place concrete barrier, including traffic barrier, traffic-pedestrian barrier,
and pedestrian barrier on bridges and related Structures, shall be made of steel or exterior
plywood coated with plastic. The Contractor may construct the barrier by the slip-form
method.

The barrier shall be made of Class 4000 concrete that meets the requirements of

Section

6-02

, except that the fine aggregate gradation used for slip-form barrier may be either

Class 1 or 2. The Contractor may use portland cement Type III at no additional expense to
the Contracting Agency.

In addition to the steel reinforcing bar tying and bracing requirements specified in

Section

6-02.3(24) C

, the Contractor may also place small amounts of concrete to aid in holding

the steel reinforcing bars in place. These small amounts of concrete shall be not more
than 2-cubic feet in volume, and shall be spaced at a minimum of 10-foot intervals within
the steel reinforcement cage. These small amounts of concrete shall be consolidated and
shall provide 2 inches minimum clearance to the steel reinforcing bars on the outside face
of the barrier. All spattered and excess mortar and concrete shall be removed from the
steel reinforcing bars prior to slip-form casting.

Barrier expansion joints shall be spaced at 96-foot intervals, and dummy joints shall be
spaced at 12-foot intervals unless otherwise specified in the Contract.

Immediately after removing the forms, the Contractor shall complete any finishing Work
needed to produce a uniformly smooth, dense surface. The surface shall have no rock
pockets and no holes larger than ¼ inch across. The barrier shall be cured and finished in
accordance with

Section 6-02.3(11)A

The maximum allowable deviation from a 10-foot straightedge held longitudinally on all
surfaces shall be ¼ inch. For single sloped barrier the maximum allowable deviation from a
straightedge held along the vertical sloped face of the barrier shall be ¼ inch.

At final acceptance of the project, the barrier shall be free from stains, smears, and any
discoloration.

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Concrete Barrier

6-10.3(3) Removing and Resetting Permanent Concrete Barrier

The Contractor shall reset concrete barrier if the Plans or the Engineer require. If resetting
is impossible immediately after removal, the Contractor shall store the barrier at Engineer-
approved locations.

6-10.3(4) Joining Precast Concrete Barrier to Cast-In-Place Barrier

The Contractor may join segments of cast-in-place barrier to precast barrier where
transitions, split barriers, or gaps shorter than 10 feet require it. At each joint of this
type, the cast-in-place segment shall include hardware that ties both its ends to abutting
precast sections.

6-10.3(5) Temporary Barrier

For temporary barrier, the Contractor may use precast concrete barrier or temporary
steel barrier. If temporary steel barrier is selected, the Contractor shall verify the
lateral deflection distance meets or is less than what is shown in the Contract Plans.
Temporary concrete barrier shall comply with Standard Plan requirements and cross-
sectional dimensions, except that: (1) it may be made in other lengths than those shown
in the Standard Plan, and (2) it may have permanent lifting holes no larger than 4 inches
in diameter or lifting loops. Temporary steel barrier shall be certified that it meets
the requirements of NCHRP 350 or MASH Test Level 3 or 4 and shall be installed in
accordance with the manufacturer’s recommendations.

If the Contract calls for the removal and resetting of permanent barrier, and the
permanent barrier is not required to remain in place until reset, the permanent barrier
may be substituted for temporary concrete barrier. Any of the permanent barrier damaged
during its use as temporary barrier will become the property of the Contractor and be
replaced with permanent barrier when the permanent barrier is reset to its permanent
location.

All barrier shall be in good condition, without cracks, chips, spalls, dirt, or traffic
marks. If any barrier segment is damaged during or after placement, the Contractor
shall immediately repair it to the Engineer’s satisfaction or replace it with an
undamaged section.

Delineators shall be placed on the traffic face of the barrier 6 inches from the top and
spaced a maximum of 40 feet on tangents and 20 feet through curves. The reflector
color shall be white on the right side of traffic and yellow on the left side of traffic.
The Contractor shall maintain, replace and clean the delineators when ordered by
the Engineer.

As soon as the temporary barrier is no longer needed, the Contractor shall remove it
from the project. Contracting Agency furnished barrier shall remain Contracting Agency
property, and the Contractor shall deliver it to a stockpile site noted in the Contract or
to locations as approved by the Engineer. Contractor furnished barrier shall remain the
property of the Contractor.

Concrete Barrier

6-10

6-10.3(6) Placing Concrete Barrier

Precast concrete barrier Type F, Types 2 and 4, precast single slope barrier, and transitions
shall rest on a paved foundation shaped to a uniform grade and section. The foundation
surface for precast concrete barrier Type F, Types 2 and 4, precast single slope barrier,
and transitions shall meet this test for uniformity: When a 10-foot straightedge is placed
on the surface parallel to the centerline for the barrier, the surface shall not vary more
than ¼ inch from the lower edge of the straightedge. If deviations exceed ¼ inch, the
Contractor shall correct them as required in

Section 5-04.3(13)

The Contractor shall align the joints of all precast segments so that they offset no more
than ¼ inch transversely and no more than ¾ inch vertically. Grouting is not permitted,
except as previously stated for single slope barrier. If foundation grade and section are
acceptable, the Engineer may permit the Contractor to obtain vertical alignment of
the barrier by shimming. Shimming shall be done with a polystyrene, foam pad (12 by
24 inches) under the end 12 inches of bearing surface.

Precast barrier shall be handled and placed with equipment that will not damage or
disfigure it.

6-10.4 Measurement

Precast concrete barrier will be measured by the linear foot along its completed line and
slope.

Temporary barrier will be measured by the linear foot along the completed line and slope
of the barrier, one time only for each setup of barrier protected area. Any intermediate
moving or resetting will not be measured.

Cast-in-place concrete barrier will be measured by the linear foot along its completed
line unless the Contract specifies that it be measured per cubic yard for concrete Class
4000 and per pound for steel reinforcing bar (as required in

Section 6-02.4

Cast-in-place concrete barrier light standard section will be measured by the unit for each
light standard section installed.

Removing and resetting existing permanent barrier will be measured by the linear foot
and will be measured one time only for removing, storage, and resetting. No measure
will be made for barrier that has been removed and reset for the convenience of the
Contractor.

Concrete barrier transition Type 2 to bridge F-shape will be measured by the linear foot
installed.

Single slope concrete barrier light standard foundation will be measured by the unit for
each light standard foundation installed.

Traffic barrier, traffic pedestrian barrier, and pedestrian barrier will be measured as
specified for cast-in-place concrete barrier.

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Concrete Barrier

6-10.5 Payment

Payment will be made for each of the following Bid items that are included in the Proposal:

“Precast Conc. Barrier Type ____”, per linear foot.
“Cast-In-Place Conc. Barrier”, per linear foot.
“Conc. Class 4000 _____”, per cubic yard.
“St. Reinf. Bar _____”, per pound.
“Removing and Resetting Existing Permanent Barrier”, per linear foot.
The unit Contract price per linear foot for “Cast-In-Place Conc. Barrier” shall be full
pay for excavation, forms, placement, special construction features, and all other
materials, tools, equipment, and labor necessary to complete the Work as specified;
except that when the Contract specifies, the unit Contract price per cubic yard for
“Conc. Class 4000 _____” and the per pound for “St. Reinf. Bar _____”, shall be full pay
for excavation, forms, placement, special construction features, and all other materials,
tools, equipment, and labor necessary to complete the Work as specified.
“Traffic Barrier”, per linear foot.
“Traffic Pedestrian Barrier”, per linear foot.
“Pedestrian Barrier” per linear foot.
The unit Contract price per linear foot for “Traffic Barrier”, “Traffic Pedestrian Barrier”,
and “Pedestrian Barrier” shall be full pay for constructing the barrier on top of the
bridge deck, and associated bridge approach slabs, curtain walls and wingwalls,
excluding the steel reinforcing bars that extend from the bridge deck, bridge approach
slab, curtain walls, and wingwalls.
“Single Slope Concrete Barrier”, per linear foot.
The unit Contract price per linear foot for “Single Slope Concrete Barrier” shall be full
pay for either cast-in-place or precast single slope concrete barrier.
“Conc. Barrier Transition Type 2 to Bridge F-Shape”, per linear foot.
The unit Contract price per linear foot for “Conc. Barrier Transition Type 2 to Bridge
F-Shape” shall be full pay for performing the Work as specified, excluding bridge traffic
barrier modifications necessary for this installation.
“Single Slope Conc. Barrier Light Standard Foundation”, per each.
“Cast-In-Place Conc. Barrier Light Standard Section”, per each.
“Temporary Barrier”, per linear foot.
The unit Contract price per linear foot for “Temporary Barrier” shall be full pay for all
costs, including furnishing, installing, connecting, anchoring, maintaining, temporary
storage, and final removal of the temporary barrier.
Payment for transition sections between different types of barrier shall be made
at the unit Contract price for the type of barrier indicated in the Plans for each
transition section.

Reinforced Concrete Walls

6-11

Reinforced Concrete Walls

6-11.1 Description

This Work consists of constructing reinforced concrete retaining walls, including those
shown in the

Standard Plans

, L walls, and counterfort walls.

6-11.2 Materials

Materials shall meet the requirements of the following sections:
Cement

9-01

Aggregates for Concrete

9-03.1

Gravel Backfill

9-03.12

Premolded Joint Filler

9-04.1(2)

Steel Reinforcing Bar

9-07.2

Epoxy-Coated Steel Reinforcing Bar

9-07.3

Concrete Curing Materials and Admixtures

9-23

Fly Ash

9-23.9

Water

9-25

Other materials required shall be as specified in the Special Provisions.

6-11.3

Construction Requirements

6-11.3(1) Submittals

The Contractor shall submit Type 2E Working Drawings consisting of excavation shoring
plans in accordance with

Section 2-09.3(3)D

The Contractor shall submit Type 2E Working Drawings of falsework and formwork plans
in accordance with Sections

6-02.3(16)

and

6-02.3(17)

If the Contractor elects to fabricate and erect precast concrete wall stem panels, Type
2E Working Drawings of the following information shall be submitted in accordance with
Section

6-02.3(28)A

1. Working drawings for fabrication of the wall stem panels, showing dimensions, steel

reinforcing bars, joint and joint filler details, surface finish details, lifting devices with
the manufacturer’s recommended safe working capacity, and material Specifications.

2. Working drawings and design calculations for the erection of the wall stem panels

showing dimensions, support points, support footing sizes, erection blockouts,
member sizes, connections, and material Specifications.

3. Design calculations for the precast wall stem panels, the connection between the

precast panels and the cast-in-place footing, and all modifications to the cast-in-
place footing details as shown in the Plans or

Standard Plans

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Reinforced Concrete Walls

6-11.3(2) Excavation and Foundation Preparation

Excavation shall conform to

Section 2-09.3(3)

, and to the limits and construction stages

shown in the Plans. Foundation soils found to be unsuitable shall be removed and
replaced in accordance with

Section 2-09.3(1)C

6-11.3(3) Precast Concrete Wall Stem Panels

The Contractor may fabricate precast concrete wall stem panels for construction of
Standard Plan Retaining Walls. Precast concrete wall stem panels may be used for
construction of non-Standard Plan retaining walls if allowed by the Plans or Special
Provisions. Precast concrete wall stem panels shall conform to

Section 6-02.3(28)

and shall be cast with Class 4000 concrete. If Self-Consolidating Concrete is used,
the concrete shall conform to Sections

6-02.3(27)B

and

6-02.3(27)C

The precast concrete wall stem panels shall be designed in accordance with the
following codes:
1. For all loads except as otherwise noted – AASHTO LRFD Bridge Design Specifications,

latest edition and current interims. The seismic design shall use the acceleration
coefficient and soil profile type as specified in the Plans.

2. For all wind loads – AASHTO Guide Specifications for Structural Design of Sound

Barriers, latest edition and current interims.

The precast concrete wall stem panels shall be fabricated in accordance with the
dimensions and details shown in the Plans, except as modified in the shop drawings.

The precast concrete wall stem panels shall be fabricated full height, and shall be
fabricated in widths of 8, 16, and 24 feet.

The construction tolerances for the precast concrete wall stem panels shall be as follows:

Height

±¼ inch

Width

±¼ inch

Thickness

+¼ inch

-⅛ inch

Concrete cover for steel reinforcing bar

+⅜ inch

-⅛ inch

Width of precast concrete wall stem panel joints

±¼ inch

Offset of precast concrete wall stem panels

±¼ inch

(Deviation from a straight line extending 5 feet on each side of the panel joint)

The precast concrete wall stem panels shall be constructed with a mating shear key
between adjacent panels. The shear key shall have beveled corners and shall be 1½ inches
in thickness. The width of the shear key shall be 3½ inches minimum and 5½ inches
maximum. The shear key shall be continuous and shall be of uniform width over the entire
height of the wall stem.

Reinforced Concrete Walls

6-11

The Contractor shall provide the specified surface finish as noted, and to the limits
shown, in the Plans to the exterior concrete surfaces. Special surface finishes achieved
with form liners shall conform to Sections

6-02.2

and

6-02.3(14)

as supplemented in the

Special Provisions. Rolled on textured finished shall not be used. Precast concrete wall
stem panels shall be cast in a vertical position if the Plans call for a form liner texture on
both sides of the wall stem panel.

The precast concrete wall stem panel shall be rigidly held in place during placement and
curing of the footing concrete.

The precast concrete wall stem panels shall be placed a minimum of 1 inch into the
footing to provide a shear key. The base of the precast concrete wall stem panel shall be
sloped ½ inch per foot to facilitate proper concrete placement.

To ensure an even flow of concrete under and against the base of the wall panel, a form
shall be placed parallel to the precast concrete wall stem panel, above the footing, to
allow a minimum 1-foot head to develop in the concrete during concrete placement.

The steel reinforcing bars shall be shifted to clear the erection blockouts in the precast
concrete wall stem panel by 1½ inches minimum.

All precast concrete wall stem panel joints shall be constructed with joint filler installed
on the rear (backfill) side of the wall. The joint filler material shall extend from 2 feet
below the final ground level in front of the wall to the top of the wall. The joint filler shall
be a nonorganic flexible material and shall be installed to create a waterproof seal at
panel joints.

The soil bearing pressure beneath the falsework supports for the precast concrete wall
stem panels shall not exceed the maximum design soil pressure shown in the Plans for
the retaining wall.

6-11.3(4) Cast-In-Place Concrete Construction

Cast-in-place concrete for concrete retaining walls shall be formed, reinforced, cast,
cured, and finished in accordance with

Section 6-02

, and the details shown in the Plans

and

Standard Plans

. All cast-in-place concrete shall be Class 4000. Cast-in-place footings

shall have a longitudinal slope no steeper than 1V: 6H, unless otherwise shown in the
Plans or Standard Plans.

6-02.2

and

6-02.3(14)

as supplemented in the

Special Provisions.

Cast-in-place concrete for adjacent wall stem sections (between vertical expansion joints)
shall be formed and placed separately, with a minimum 12-hour time period between
concrete placement operations.

Premolded joint filler, ½ inch thick, shall be placed full height of all vertical wall stem
expansion joints in accordance with

Section 6-01.14

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Reinforced Concrete Walls

6-11.3(5) Backfill, Weepholes, and Gutters

Unless the Plans specify otherwise, backfill and weepholes shall be placed in accordance
with the

Standard Plans

and

Section 6-02.3(22)

. Gravel backfill for drain shall be

compacted in accordance with

Section 2-09.3(1)E

. Backfill within the zone defined as

Bridge Approach Embankment in

Section 1-01.3

shall be compacted in accordance with

Method C of

Section 2-03.3(14)C

. All other backfill shall be compacted in accordance with

Method B of

Section 2-03.3(14)C

, unless otherwise specified.

Cement concrete gutter shall be constructed as shown in the

Standard Plans

6-11.3(6) Traffic Barrier and Pedestrian Barrier

When shown in the Plans, traffic barrier and pedestrian barrier shall be constructed in
accordance with Sections

6-02.3(11)A

and

6-10.3(2)

, and the details shown in the Plans

and

Standard Plans

6-11.4 Measurement

Concrete Class 4000 for retaining wall will be measured as specified in

Section

6-02.4

. Steel reinforcing bar for retaining wall and epoxy-coated steel reinforcing bar for

retaining wall will be measured as specified in

Section 6-02.4

Traffic barrier and pedestrian barrier will be measured as specified in

Section 6-10.4

for

cast-in-place concrete barrier.

6-11.5 Payment

Payment will be made for each of the following Bid items when they are included in the
Proposal:

“Conc. Class 4000 For Retaining Wall”, per cubic yard.
All costs in connection with furnishing and installing weep holes and premolded
joint filler shall be included in the unit Contract price per cubic yard for “Conc. Class
4000 for Retaining Wall”.
“St. Reinf. Bar For Retaining Wall”, per pound.
“Epoxy-Coated St. Reinf. Bar For Retaining Wall”, per pound.
“Traffic Barrier”, per linear foot.
“Pedestrian Barrier”, per linear foot.
The unit Contract price per linear foot for “___ Barrier” shall be full pay for
constructing the barrier on top of the retaining wall, except that when these Bid
items are not included in the Proposal, all costs in connection with performing the
Work as specified shall be included in the unit Contract price per cubic yard for
“Conc. Class 4000 For Retaining Wall”, and the unit Contract price per pound for “___
Bar For Retaining Wall”.

Noise Barrier Walls

6-12

Noise Barrier Walls

6-12.1 Description

This Work consists of constructing cast-in-place concrete, precast concrete, masonry, and
timber noise barrier walls, including those shown in the

Standard Plans

6-12.2 Materials

Materials shall meet the requirements of the following sections:
Cement

9-01

Aggregates for Concrete

9-03.1

Gravel Backfill

9-03.12

Premolded Joint Filler

9-04.1(2)

Bolts, Nuts, and Washers

9-06.5(1)

Noise Barrier Wall Access Door

9-06.17

Steel Reinforcing Bar

9-07.2

Epoxy-Coated Steel Reinforcing Bar

9-07.3

Paints

9-08

Grout

9-20.3

Concrete Curing Materials and Admixtures

9-23

Fly Ash

9-23.9

Water

9-25

Other materials required shall be as specified in the Special Provisions.

6-12.3

Construction Requirements

6-12.3(1) Submittals

All noise barrier walls not constructed immediately adjacent to the Roadway, and that
require construction of access for Work activities, shall have a noise barrier wall access
plan. The Contractor shall submit a Type 2 Working Drawing consisting of the noise
barrier wall access plan. The noise barrier wall access plan shall include, but not be limited
to, the locations of access to the noise barrier wall construction sites, and the method,
materials, and equipment used to construct the access, remove the access, and recontour
and reseed the disturbed ground.

For construction of all noise barrier walls with shafts, the Contractor shall submit a Type
2 Working Drawing consisting of the shaft construction plan, including at a minimum the
following information:
1. List and description of equipment to be used to excavate and construct the shafts,

including description of how the equipment is appropriate for use in the expected
subsurface conditions.

2. The construction sequence and order of shaft construction.

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Noise Barrier Walls

3. Details of shaft excavation methods, including methods to clean the shaft

excavation.

4. Details and dimensions of the shaft, and casing if used.
5. The method used to prevent ground caving (temporary casing, slurry, or

other means).

6. Details of concrete placement including procedures for deposit through a conduit,

tremie, or pump.

7. Method and equipment used to install and support the steel reinforcing bar cage.

For construction of precast concrete noise barrier walls, the Contractor shall submit
Type 2 Working Drawings consisting of shop drawings for the precast concrete panels
in accordance with

Section 6-02.3(28)A

. In addition to the items listed in

Section

6-02.3(28)A

, the precast concrete panel shop drawings shall include the following:

1.  Construction sequence and method of forming the panels.
2.  Details of additional reinforcement provided at lifting and support locations.
3.  Method and equipment used to support the panels during storage, transporting, and

erection.

4. Erection sequence, including the method of lifting the panels, placing and adjusting

the panels to proper alignment and grade, and supporting the panels during bolting,
grouting, and backfilling operations.

The Contractor shall not begin noise barrier wall construction activities, including access
construction and precast concrete panel fabrication, until receiving the Engineer’s
approval of all appropriate and applicable submittals.

6-12.3(2) Work Access and Site Preparation

The Contractor shall construct Work access in accordance with the Work access plan. The
construction access roads shall minimize disturbance to the existing vegetation, especially
trees. Only trees and shrubs in direct conflict with the approved construction access road
alignment shall be removed. Only one access road into the noise barrier wall from the
main Roadway and one access road from the noise barrier wall to the main Roadway shall
be constructed at each noise barrier wall.

Existing vegetation that has been identified by the Engineer shall be protected in
accordance with Sections

1-07.16

and

2-01

, and the Special Provisions.

6-12.3(3) Shaft Construction

The Contractor shall excavate and construct the shafts in accordance with the shaft
construction plan.

The shafts shall be excavated to the required depth as shown in the Plans. The excavation
shall be completed in a continuous operation using equipment capable of excavating
through the type of material expected to be encountered.

Noise Barrier Walls

6-12

If the shaft excavation is stopped, the Contractor shall secure the shaft by installing a
safety cover over the opening. The Contractor shall ensure the safety of the shaft and
surrounding soil and the stability of the side walls. A temporary casing, slurry, or other
methods acceptable to the Engineer shall be used as necessary to ensure such safety
and stability.

When caving conditions are encountered, the Contractor shall stop further excavation
until implementing the method to prevent ground caving as specified in the shaft
construction plan.

When obstructions are encountered, the Contractor shall notify the Engineer promptly.
An obstruction is defined as a specific object (including, but not limited to, boulders,
logs, and man made objects) encountered during the shaft excavation operation, which
prevents or hinders the advance of the shaft excavation. When efforts to advance past
the obstruction to the design shaft tip elevation result in the rate of advance of the
shaft drilling equipment being significantly reduced relative to the rate of advance for
the rest of the shaft excavation, then the Contractor shall remove the obstruction under
the provisions of

Section 6-12.5

. The method of removal of such obstructions, and the

continuation of excavation shall be as proposed by the Contractor and accepted by
the Engineer.

The Contractor shall use appropriate means to clean the bottom of the excavation of
all shafts. No more than 2 inches of loose or disturbed material shall be present at the
bottom of the shaft just prior to beginning concrete placement.

The Contractor shall not begin placing steel reinforcing bars and concrete in the shaft
until receiving the Engineer’s acceptance of the shaft excavation.

The steel reinforcing bar cage shall be rigidly braced to retain its configuration during
handling and construction. The Contractor shall not place individual or loose bars. The
Contractor shall install the steel reinforcing bar cage as specified in the shaft construction
plan. The Contractor shall maintain the minimum concrete cover shown in the Plans.

If casings are used, the Contractor shall remove the casing during concrete placement. A
minimum 5-feet head of concrete shall be maintained to balance soil and water pressure
at the bottom of the casing. The casing shall be smooth. Where the top of the shaft is
above the existing ground, the Contractor shall case the top of the hole prior to placing
the concrete.

Concrete for shafts shall conform to Class 4000P. The Contractor shall place concrete in
the shaft immediately after completing the shaft excavation and receiving the Engineer’s
acceptance of the excavation. The Contractor shall place the concrete in one continuous
operation to the elevation shown in the Plans, using a method to prevent segregation of
aggregates. The Contractor shall place the concrete as specified in the shaft construction
plan. If water is present, concrete shall be placed in accordance with

Section 6-02.3(6)B

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Noise Barrier Walls

6-12.3(4) Trench, Grade Beam, or Spread Footing Construction

Where the noise barrier wall foundations exist below the existing ground line, excavation
shall conform to

Section 2-09.3(4)

, and to the limits and construction stages shown in

the Plans. Foundation soils found to be unsuitable shall be removed and replaced in
accordance with

Section 2-09.3(1)C

Where the noise barrier wall foundations exist above the existing ground line,
the Contractor shall place and compact backfill material in accordance with

Section 2-03.3(14)C

Concrete for trench, grade beam, or spread footing foundations shall conform to
Class 4000.

Cast-in-place concrete shall be formed, placed, and cured in accordance with

Section 6-02

, except that concrete for trench foundations shall be placed against

undisturbed soil. Cast-in-place footings shall have a longitudinal slope no steeper than
1V: 6H, unless otherwise shown in the Plans or Standard Plans.

The excavation shall be backfilled in accordance with item 1 of the Compaction
Subsection of

Section 2-09.3(1)E

The steel reinforcing bar cage and the noise barrier wall anchor bolts shall be installed
and rigidly braced prior to grade beam and spread footing concrete placement to retain
their configuration during concrete placement. The Contractor shall not place individual
or loose steel reinforcing bars and anchor bolts, and shall not install anchor bolts during or
after concrete placement.

6-12.3(5) Cast-In-Place Concrete Panel Construction

Construction of cast-in-place concrete panels for noise barrier walls shall conform to

Section 6-11.3(4)

. For noise barrier walls with traffic barrier, the construction of the traffic

barrier shall also conform to

Section 6-10.3(2)

The top of the cast-in-place concrete panels shall conform to the top of wall profile
shown in the Plans. Where a vertical step is constructed to provide elevation change
between adjacent panels, the dimension of the step shall be 2 feet. Each horizontal run
between steps shall be a minimum of 48 feet.

6-12.3(6) Precast Concrete Panel Fabrication and Erection

The Contractor shall fabricate and erect the precast concrete panels in accordance with

Section 6-02.3(28)

, and the following requirements:

1. Concrete shall conform to Class 4000. If Self-Consolidating Concrete is used, the

concrete shall conform to Sections

6-02.3(27)B

and

6-02.3(27)C

2. Except as otherwise noted in the Plans and Special Provisions, all concrete surfaces

shall receive a Class 2 finish in accordance with

Section 6-02.3(14)B

Noise Barrier Walls

6-12

3. The precast concrete panels shall be cast in accordance with

Section 6-02.3(28)B

The Contractor shall fully support the precast concrete panel to avoid bowing and
sagging surfaces.

After receiving the Engineer’s review of the shop drawings, the Contractor shall cast
one precast concrete panel to be used as the sample panel. The Contractor shall
construct the sample panel in accordance with the procedure and details specified
in the shop drawings. The Contractor shall make the sample panel available to the
Engineer for acceptance.

Upon receiving the Engineer’s acceptance of the sample panel, the Contractor
shall continue production of precast concrete panels for the noise barrier wall. All
precast concrete panels will be evaluated against the sample panel for the quality
of workmanship exhibited. The sample panel shall be retained at the fabrication site
until all precast concrete panels have been fabricated and accepted. After completing
precast concrete panel fabrication, the Contractor may utilize the sample panel as a
production noise barrier wall panel.

4. In addition to the fabrication tolerance requirements of

Section 6-02.3(28)F

, the

precast concrete panels for noise barrier walls shall not exceed the following scalar
tolerances:

Length and Width: ± ⅛ inch per 5 feet, not to exceed ¼ inch total.

Thickness: ± ¼ inch.

The difference obtained by comparing the measurement of the diagonal of the face
of the panels shall not be greater than ½ inch.

Dimension tolerances for the traffic barrier portion of precast concrete panels
formed with traffic barrier shapes shall conform to

Section 6-10.3(2)

5. Precast concrete panels shall not be erected until the foundations for the panels

have attained a minimum compressive strength of 3,400 psi.

6. The bolts connecting the precast concrete panels to their foundation shall be

tightened to “snug tight” as defined in

Section 6-03.3(32)

7. After erection, the precast concrete panels shall not exceed the joint space

tolerances shown in the Plans. The panels shall not exceed ⅜ inch out of plumb in

any direction.

The Contractor shall seal the joints between precast concrete panels with a backer
rod and sealant system as specified. The Contractor shall seal both sides of the joint
full length.

The top of precast concrete panels shall conform to the top of wall profile shown in the
Plans. Where a vertical step is constructed to provide elevation change between adjacent
panels, the dimension of the step shall be 2 feet. Each horizontal run between steps shall
be a minimum of 48 feet.

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6-12.3(7) Masonry Wall Construction

Construction requirements for masonry noise barrier wall panels shall be as specified in
the Special Provisions.

6-12.3(8) Fabricating and Erecting Timber Noise Barrier Wall Panels

Construction requirements for timber noise barrier wall panels shall be as specified in the
Special Provisions.

6-12.3(9) Access Doors and Concrete Landing Pads

The Contractor shall install access doors and door frames as shown in the Plans and

Standard Plans

. The Contractor shall install the access doors to open toward the Roadway

side. The door frames shall be set in place with grout conforming to either

Section

9-20.3(2)

9-20.3(4)

and placed in accordance with

Section 6-02.3(20)

, with the grout

completely filling the void between the door frame and the noise barrier wall panel.

All frame and door surfaces, except stainless steel surfaces, shall be painted in accordance
with

Section 6-07.3(9)

. Primer shall be applied to all non-stainless steel surfaces.

All primer coated exposed metal surfaces shall be field painted with the remaining

Section 6-07.3(9)A

paint system coats. The top coat, when dry, shall match the color

specified in the Plans or Special Provisions.

The Contractor shall construct concrete landing pads for each access door location as
shown in the Plans. The concrete shall conform to

Section 6-02.3(2)B

Access door deadbolt locks shall be capable of accepting a Best CX series core. The
Contractor shall furnish and install a spring-loaded construction core lock with each lock.
The Engineer will furnish the permanent Best CX series core for the Contractor to install
at the conclusion of the project.

6-12.3(10) Finish Ground Line Dressing

The Contractor shall contour and dress the ground line on both sides of the noise barrier
wall, providing the minimum cover over the foundation as shown in the Plans. The
Contractor shall contour the ground adjacent to the barrier to ensure good drainage away
from the barrier.

After the access roads are no longer needed for noise barrier wall construction activities,
the Contractor shall restore the area to the original condition. The Contractor shall
recontour the access roads to match into the surrounding ground and shall reseed all
disturbed areas in accordance with the

Section 8-01

and the Special Provisions, and the

noise barrier wall access plan.

Noise Barrier Walls

6-12

6-12.4 Measurement

Noise barrier wall will be measured by the square foot area of one face of the completed
wall panel in place. Except as otherwise noted, the bottom limit for measurement will be
the top of the trench footing, spread footing, or shaft cap. For Noise Barrier Type 5, the
bottom measurement limit will be the optional construction joint at the base of the traffic
barrier. For Noise Barrier Type 7, the bottom measurement limit will be base of the traffic
barrier. For Noise Barrier Types 8, 11, 12, 14, 15, and 20, the bottom measurement limit
will be the base of the wall panel.

Noise barrier wall access door will be measured once for each access door assembly with
concrete landing pad furnished and installed.

6-12.5 Payment

Payment will be made for each of the following Bid items when they are included in the
Proposal:

“Noise Barrier Wall Type __”, per square foot.
The unit Contract price per square foot for “Noise Barrier Wall Type __” shall be
full pay for constructing the noise barrier walls as specified, including constructing
and removing access roads, excavating and constructing foundations and grade
beams, constructing cast-in-place concrete, and masonry wall panels, fabricating and
erecting precast concrete, and timber wall panels, applying sealer, and contouring
the finish ground line adjacent to the noise barrier walls.
“Noise Barrier Wall Access Door”, per each.
The unit Contract price per each for “Noise Barrier Wall Access Door” shall be full
pay for furnishing and installing the access door assembly as specified, including
painting the installed access door assembly and constructing the concrete landing
pads.
“Removing Noise Barrier Wall Shaft Obstructions”, estimated.
Payment for removing obstructions, as defined in

Section 6-12.3(3)

, will be made

for the changes in shaft construction methods necessary to remove the obstruction.
The Contractor and the Engineer shall evaluate the effort made and reach agreement
on the equipment and employees utilized, and the number of hours involved
for each. Once these cost items and their duration have been agreed upon, the
payment amount will be determined using the rate and markup methods specified
in

Section 1-09.6

. For the purpose of providing a common proposal for all bidders,

the Contracting Agency has entered an amount for the item “Removing Noise Barrier
Wall Shaft Obstructions” in the bid proposal to become a part of the total bid by
the Contractor.

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Noise Barrier Walls

If the shaft construction equipment is idled as a result of the obstruction removal work
and cannot be reasonably reassigned within the project, then standby payment for
the idled equipment will be added to the payment calculations. If labor is idled as a
result of the obstruction removal work and cannot be reasonably reassigned within the
project, then all labor costs resulting from Contractor labor agreements and established
Contractor policies will be added to the payment calculations.

The Contractor shall perform the amount of obstruction work estimated by the
Contracting Agency within the original time of the contract. The Engineer will consider a
time adjustment and additional compensation for costs related to the extended duration
of the shaft construction operations, provided:
1. The dollar amount estimated by the Contracting Agency has been exceeded, and;
2. The Contractor shows that the obstruction removal work represents a delay to

the completion of the project based on the current progress schedule provided in
accordance with

Section 1-08.3

Standard Specifications for Road, Bridge, and Municipal Construction 2020 (M 41-10) - page 38