621TRAFFIC BARRIERS

621

6-74SECTION 621 – TRAFFIC BARRIERS

621.01DESCRIPTION . This work shall consist of furnishing, assembling, removing, repairing, or

resetting traffic barriers.

621.02MATERIALS . Materials shall meet the requirements of the following subsections:

Grease Rustproofing Compound ................................ ................................ ................ 708.04 Coatings for Wood ................................ ................................ ................................ .....708.05 Galv anizing ................................ ................................ ................................ ................ 726.06 Posts ................................ ................................ ................................ ........................... 728.01 Beam and Cable Elements ................................ ................................ ......................... 728.02 Hardware ................................ ................................ ................................ .................... 728.03 Offset Blocks ................................ ................................ ................................ ............. 728.04 Concrete Anchors ................................ ................................ ................................ .......728.05 Manufactured Terminal Sections ................................ ................................ ............... 728.06 Energy Absorption Attenuators ................................ ................................ ................. 728.07 Temporary Traffic Barrier ................................ ................................ ......................... 728.08 Flat Sheet Aluminum ................................ ................................ ................................ .750.03 Retroreflective Sheeting ................................ ................................ ............................. 750.04 Reinforcing steel shall meet the requirements of Section 507 . Materials for removing and resetting guardrail, replacing guardrail post assemblies, replacing guardrail beam units, and adjust the height of guardrail sha ll consist of the acceptable beams and cable, posts, offset blocks, bolts, and other hardware of the existing guardrail together with the necessary new replacement parts. The new replacement parts shall match the existing components they replace as closely as possible. All welding shall conform to the requirements of Subsection 506.10 .

621.03FABRICATION DRAWINGS . The fabricator of guardrail approach sections furnished under this

section shall submit detailed fabrication drawings in accordance with Subsection 105.06 .

621.04POSTS AND OFFSET BLOCKS . Posts may be set in holes, or they may be driven if suitable

caps and driving equipment are used to prevent damage to the posts. The installed posts shall be plumb, accurately aligned, spaced as shown on the Plans, and placed to the full depth indicated. The space around the posts shall be backfilled with suitable material in 6 inch layers and tamped thoroughly with air or mechanical tampers.

621

6-75Posts for steel backed timber guardrail may be driven or installed into pre -drilled holes. The dimensions

of the pre-drilled hole shall not exceed the dimensions of the post by more than 1 inch. If impenetrable material is encountered while placing the post, the pre -drilled hole shall be enlarged to provide not less than 6 inches of clearance on all sides and a mini mum depth of 2 -1/2 feet and the post shall be set in concrete to within 6 inches of the top of the hole. The type of concrete shall be approved by the Engineer. The remaining 6 inches shall be backfilled with a suitable material and compacted to the satisf action of the Engineer. The guardrail designated to be removed and reset shall be carefully removed, temporarily stored when necessary, and reinstalled at the new location. Materials damaged or lost shall be replaced with new material by the Contractor at no cost to the Agency. The new materials shall be equal to or better than the material of the existing guardrail. Guardrail to be removed and reset shall be installed at the height specified on the Plans for the type of guardrail being reset. Guardrail pos ts and anchors shall be installed prior to placing the adjacent top course of pavement unless otherwise directed by the Engineer.

621.05RAIL ELEMENTS

installation. All bolts, except adjustment bolts, shall be drawn tight. Bolts shall be of sufficient length to extend beyond the nuts.

shall be treated with an approved material as determined by the Engineer.

621.06ENERGY ABSORPTION ATTENUATORS . Energy absorption attenuators, permanent or

temporary, shall be installed at the locations shown on the Plans or in the approved traffic control plan and per the manufacturer’s recommendations. Installation of any traffic barrier requiring protection with an energy absorption attenuator shall not begin until the complete energy absorption attenuator i s on the project site and ready to be installed. Attenuators shall be a minimum of Test Level 3 for posted speed limits greater than 40 mph and a minimum of Test Level 2 for posted speed limits of 40 mph and less, in accordance with MASH .

728.07(b)

621 6-76 (b) Temporary . Temporary energy absorption attenuators shall be in accordance with Subsection

(a) . It shall be the Contractor’s responsibility to maintain all in -service temporary energy

absorption attenuators in accordance with the manufacturer’s recommendations. Any damage which affects the performance of the attenuator, as determined by the Engineer, shall be repaired immediately in accordance w ith the manufacturer’s recommendations or the attenuator shall be replaced with the spare temporary energy absorption attenuator as necessary. A single spare temporary energy absorption attenuator, of each type installed, shall be on the project site while any temporary energy absorption attenuator is in service and shall be ready to be installed in the case a temporary energy absorption attenuator needs to be replaced or repaired. In the case a spare temporary energy absorption attenuator has been used, co mpletely or in part, the Contractor shall replace all used components of the spare so that a fully functioning spare is available within 48 hours of the use of any spare. Temporary energy absorption attenuators shall be removed from the project upon determ ination, by the Engineer, that they are no longer needed and shall remain the property of the Contractor. Liquid or sand filled temporary energy absorption attenuators shall not be used between November 16th and March 31st, inclusive.

621.07TEMPORARY TRA FFIC BARRIER . Temporary traffic barrier shall be installed at the locations

shown on the Plans, in the approved traffic control plan, or as directed by the Engineer and per the manufacturer’s recommendations. The barrier shall be one of the barriers included in the FHWA Roadside Hardware Policy Memoranda and Guidance for crashworthy longitudinal barriers, at the Contractor’s discretion, unless otherwise specified. The Contractor shall provide the name of the temporary traffic barrier and current FHWA eligibility letter for the t emporary traffic barrier to the Engineer prior to installation. If temporary traffic barrier meeting NCHRP Report 350 is used, the Contractor shall submit an affidavit certifying that it was manufactured prior to January 1, 2020. Temporary traffic barrier components shall be in a condition satisfactory to the Engineer prior to placement on the project and maintained as such until removed from the project. Temporary traffic barrier shall be removed from the project w hen no longer needed and shall remain the property of the Contractor. The area from which the barrier was removed shall be restored to a satisfactory condition. Temporary traffic barrier and required appurtenances shall be removed and reset as shown on the Plans or as ordered in writing by the Engineer.

621 6-77 621.08 TEMPORARY TRAFFIC PROTECTION . Barrier used for temporary traffic protection shall be existing guardrail that is removed and reset, new guardrail, or temporary traffic barrier installed in locations detailed on the Plans to allow full -width construction. Barrier for temporary traffic protection shall only be used during the construction season on active projects as a temporary protection method. Any traffic protection measures that are requi red during shutdowns of work activities shall be permanent and conform to applicable standards.

621.09TERMINALS AND END ASSEMBLIES . Terminals and end assemblies shall be installed at the

locations shown on the Plans and as detailed on the Plans or per the manufacturer’s recommendations. New traffic barrier installations shall be protected by a terminal or end assembly the same day the traffic barrier is installed and may be protected perm anently as shown on the Plans or temporarily as approved by the Engineer. Temporary terminals and end assemblies shall not be in place more than 48 hours and will be considered incidental to other traffic barrier items. All new terminal and end assembly installations shall include a permanent identification of the year of installation and model identified on the Agency’s Approved Products List or the Standard Drawing used. Payment will be incidental to the traffic barrier items. Terminals and end assemblies shall be of the type specified in the Contract.

621.10ANCHORS . Anchors shall be installed at the locationss hown on the Plans. Backfill material shall

be placed in layers of not more than 6 inches and shall be thoroughly compacted by use of a mechanical tamper, to the satisfaction of the Engineer. Cables, when required, shall be drawn taut and fastened securely to the anchor assemblies as shown on the Plans and adjusted to equalize the stresses.

621.11DELINEATION . Delineation devices shall consist of flat sheet aluminum and retroreflective

sheeting of the design shown on the Plans and shall be securely fastened to traffic barriers as shown on the Plans or as directed by the Engineer.

621.12FIELD PAINTING . Galvanized components that have been cut, abraded, or damaged such that

base metal is exposed shall be repaired with two coats of zinc paint in accor dance with Subsection 726.06 , and paint when specified on the Plans. Wherever guardrail panels are nested, the surfaces on both panels that will be in contact with each other shall be coated with grease rustproofing compound. Overlapping at splices will no t be considered nesting.

621 6-78 621.13 REPLACEMENT, ADJUSTMENT, REMOVAL, AND DISPOSAL . Guardrail which is to remain in place will be inspected by the Engineer for damage, unsuitability, and conformance to current guardrail standards. The Engineer will mark guardrail components which a re to be replaced. The guardrail shall then be checked for height conformance. Guardrail sections which measure outside of the allowable heights specified in Table 621.13A shall be adjusted to the standard height described for the type of guardrail to be adjusted. All measurements shall be taken from the adjacent pavement surface to the top of rail. TABLE 621.13A – ALLOWABLE GUARDRAIL HEIGHTS Guardrail Type Low Measure Tolerance (in.) High Measure Tolerance (in.) Adjust to Height (in.) Standard W -beam (splice at post) 27-3/4 31 29 Midwest Guardrail System (MGS, splice

between posts)

29-3/4 33 31

Box beam 25-3/4 29 27

Sections which generally conform for height but have many variations due to erosion or filling of the

shoulder from normal mechanisms shall have the shoulder graded as specified on the Plans before being

checked for height conformance. After adjustment is complete, the existing rail shall conform to current

design standards for height as appropriate for the type of guardrail being adjusted.

Guardrail height adjustments shall be made to reflect guardrail height at final grade. The Contractor shall

repair or replace all damaged or missing components. Components shall be repaired or replaced as

determined by the Engineer and in accordance with the Plans or current standards, as applicable.

The finished appearance of the rehabilitated rail shall be a continuous smooth line without abrupt dips

over the entire section, to the satisfaction of the Engineer.

Offset blocks designated for replacement shall be replaced with polyvinyl blocks unless wood blocks are

specifically called for on the Plans. Materials shall be in conformance with the applicable requirements of

Subsection 728.04.

621

Unless otherwise specified in the Contract, material to be removed shall become the property of the

Contractor. Materials removed from service shall be removed from the state right-of-way limits at the end

of each work day, unless otherwise approved by the Engineer. Materials removed shall be disposed of in

accordance with applicable local, state, and federal regulations.

Unless otherwise indicated, anchors which are designated for removal and disposal, not removal and

salvage, may have the anchor or anchor block abandoned in place with the anchor rod cut in such a manner

that no portion of the anchor assembly is within 1 foot of the ground, shoulder, or roadway surface.

If posts or anchors are removed from an area where there is no other excavation or embankment work, the

resulting holes shall be backfilled with suitable material matching as closely as possible the surface,

subbase, and other materials in both type and depth. The backfill shall be placed in layers not more than

6 inches in depth, thoroughly compacted using a mechanical tamper, and the area seeded in accordance

with Section 651.

Existing materials to be salvaged shall be protected from damage or loss by the Contractor during

construction operations. Materials lost or damaged shall be replaced with new materials by the Contractor

at no expense to the Agency. New materials shall be equal to, or better than, the materials in the existing

guardrail.

621.14METHOD OF MEASUREMENT. The quantity of Removal of Guardrail to be measured for

payment will be the number of linear feet removed in the complete and accepted work, measured from

end post to end post to which rail was attached.

The quantity of Removal of Guardrail Posts and Removal of Guardrail Offset Blocks to be measured for

payment will be the number of each removed in the complete and accepted work.

The quantity of Remove and Reset Temporary Traffic Barrier to be measured for payment will be the

number of linear feet removed and reset, measured from end-to-end of the allowable length, including

energy absorption attenuators as needed, as described herein, as shown on the Plans, or as directed by the

Engineer.

The quantity of Remove and Reset Guardrail to be measured for payment will be the number of linear feet

reset in the complete and accepted work, measured in accordance with the type of guardrail specified.

621

The quantity of Adjust Height of Guardrail to be measured for payment will be the number of linear feet

of adjusted guardrail complete in place measured from center to center of the end posts to which the rail

elements are attached. Payment will not include measurement of any rail element or anchorage which

extends beyond the last post to which the rail elements are attached, nor will any factor based on post

spacing distances be applied to the measured distance.

The quantity of Replace Guardrail Beam Unit, W-Beam; Replace Guardrail Beam Unit, Box Beam; and

Replace Guardrail Beam Unit, Thrie Beam to be measured for payment will be the number of 12.5-foot

rail panels replaced. Those rail panels that are longer or shorter than 12.5 feet in length shall be converted

to an equivalent number of 12.5-foot rail panels. The quantity will not be factored for post spacing.

The quantity of Replace Guardrail Post Assembly, W-Beam with 6 Foot Posts; Replace Guardrail Post

Assembly, W-Beam with 8 Foot Posts; Replace Guardrail Post Assembly, Box Beam; and Replace

Guardrail Post Assembly, Thrie Beam to be measured for payment will be the number of individual posts

replaced in the complete and accepted work.

The quantity of Steel Beam Guardrail; Steel Beam Guardrail with 8 Foot Posts; Steel Beam Guardrail,

Nested; Steel Beam Guardrail with 8 Foot Posts, Nested; HD Steel Beam Guardrail; HD Steel Beam

Guardrail with 8 Foot Posts; HD Steel Beam Guardrail, Nested; HD Steel Beam Guardrail with 8 Foot

Posts, Nested; and Thrie Beam Guardrail to be measured for payment will be the number of linear feet of

each kind specified installed in the complete and accepted work, measured center to center of end posts

to which rail is attached. The measured quantity will not include those portions of the installation within

the pay limits for manufactured terminal section (MTS) or terminal connector items. Where terminal end

sections are installed, an additional 2 feet of guardrail will be included for each end section. W-beam to

Thrie beam transition sections will be paid for as an equal length of Thrie beam guardrail.

The measured quantity of Steel Beam Guardrail of the type specified, HD Steel Beam Guardrail of the

type specified, and Thrie Beam Guardrail will be multiplied by the post spacing factors specified in the

Table 621.14A.

TABLE 621.14A – BEAM GUARDRAIL POST SPACING FACTORS

Post Spacing Factor

6 ft 3 in. 1.0

4 ft 2 in. 1.2

3 ft 1-1/2 in. 1.4

621

The quantity of Steel Beam Guardrail Offset Block; Terminal Connector for Steel Beam Guardrail;

Anchor for Steel Beam Guardrail; Anchor for Steel Beam Guardrail, MGS; Anchor for Steel Beam to Box

Beam Transition; and Traffic Barrier Delineator to be measured for payment will be the number of each

component installed in the complete and accepted work.

The quantity of Guardrail Transition, Steel Beam to Box Beam to be measured for payment will be the

number of linear feet of transition rail used in the complete and accepted work. Measurement will be made

along the face of the rail from end to end or between the pay limits specified.

The quantity of Box Beam Guardrail to be measured for payment will be the number of linear feet installed

in the complete and accepted work, measured from center to center of end posts. An additional 1 foot of

guardrail will be allowed for each overhang.

The quantity of Temporary Traffic Barrier to be measured for payment will be the number of linear feet

installed and removed in the complete and accepted work, measured from end to end of each installation,

including terminals. Any barrier removed and not reset will not be measured for payment under this item,

but will be considered incidental to the original installation of the barrier. No measurement for payment

will be made for barrier that is removed and reset for the convenience of the Contractor, for minor

adjustments of 2 feet or less in any direction, or for any removal and resetting that was not approved by

the Engineer.

The quantity of Temporary Traffic Protection to be measured for payment will be the number of linear

feet of barrier placed in the complete and accepted work, measured from end to end of each installation,

including end terminals and anchors. Only the initial removal and resetting of existing guardrail,

placement of new guardrail, or placement of temporary traffic barrier used for temporary traffic protection

will be measured for payment. Any other interim placements or adjustments prior to installation of

permanent guardrail, either for the convenience of the Contractor, damage after initial placement, or as

directed by the Engineer, will be considered incidental to the work.

The quantity of Steel Backed Timber Guardrail to be measured for payment will be the number of linear

feet installed in the complete and accepted work, measured from end to end along the face of rail, including

terminal sections. The measured length will be multiplied by a factor of 1.4 for a post spacing of 5 feet.

The quantity of MTS of the type specified; Box Beam Guardrail End Assembly, Type IIA; and Guardrail

Approach Section of the type specified to be measured for payment will be the number of units of each

type specified, installed in the complete and accepted work.

621

The quantity of Energy Absorption Attenuator, Temporary of the type specified and Energy Absorption

Attenuator, Permanent of the type specified to be measured for payment will be the number of each unit

installed in the complete and accepted work. The spare temporary energy absorption attenuator will not

be measured for payment since supplying a spare on the project will be considered incidental to the Energy

Absorption Attenuator, Temporary item.

621.15BASIS OF PAYMENT. The accepted quantity of Removal of Guardrail will be paid for at the

Contract unit price per linear foot. Removed guardrail that is not reset will be paid for as Removal of

Guardrail. Payment will be full compensation for removing and disposing of materials, including treated

timber curbing and the associated bituminous concrete fillet, and for restoration of the old site when

required.

The accepted quantity of Removal of Guardrail Posts and Removal of Guardrail Offset Blocks will be

paid for at the Contract unit price for each. Payment will be full compensation for removing and disposing

of materials and for restoration of the old site when required.

The accepted quantity of Remove and Reset Temporary Traffic Barrier will be paid for at the Contract

unit price per linear foot. Payment will be full compensation for removing, transporting, storing,

reassembling all parts necessary, cutting, furnishing of new parts when necessary, reinstalling at the new

locations, reinstalling required terminals or energy absorption attenuators, and for furnishing all labor,

tools, equipment, and incidentals necessary to complete the work. Payment will also include removing

and replacing anchors.

The accepted quantity of Remove and Reset Guardrail will be paid for at the Contract unit price per linear

foot. Payment will be full compensation for removing, transporting, storing, reassembling all parts

necessary; removing and disposing of treated timber curbing and the associated bituminous concrete fillet;

cutting; furnishing of new hardware when necessary; reinstalling at the new locations; furnishing and

applying stain, paint, and preservative material; and for furnishing all labor, tools, equipment, and

incidentals necessary to complete the work. Payment for removing and replacing anchors, terminals, and

end assemblies when required will be paid for under the applicable Contract items. Replacing panels,

offset blocks, and posts will be paid for separately under the applicable Contract items.

The accepted quantity of Adjust Height of Guardrail will be paid for at the Contract unit price per linear

foot. Payment will be full compensation for adjusting the height of the existing guardrail to conform to

current standards; for any necessary excavation and backfill, including proper compaction; for furnishing,

transporting, handling, and installing components which are necessary to make the adjusted guardrail a

complete installation and which are not part of any other pay item in the Contract; for disposing of

removed components which are not reused; and for furnishing the labor, tools, equipment, and incidentals

necessary to complete the work. Replacing panels, offset blocks, and posts will be paid for separately

under the applicable Contract items.

621

The accepted quantity of Replace Guardrail Beam Unit, W-Beam; Replace Guardrail Beam Unit, Box

Beam; and Replace Guardrail Beam Unit, Thrie Beam will be paid for at the Contract unit price for each.

Payment will be full compensation for removing and disposing of the designated beam panel; for

furnishing, transporting, handling, and installing the replacement components needed, including new rail

beam units of the required length; replacement backer plates if required and not covered under another

Contract item, new reflectors or other delineation if required and not covered under a post assembly

replacement item; new bolts, nuts, washers, and any other necessary hardware; for drilling holes as

required to complete the installation of the replacement panel; and for furnishing all labor, tools,

equipment, and incidentals necessary to complete the work. Minor repairs and replacement of parts for

anchorage devices, such as tightening nuts, adjusting turn buckles, replacing nuts or bolts, rethreading rod

ends, etc. will be considered incidental to the other Section 621 pay items in the Contract.

The accepted quantity of Replace Guardrail Post Assembly, W-Beam with 6 Foot Posts; Replace Guardrail

Post Assembly, W-Beam with 8 Foot Posts; Replace Guardrail Post Assembly, Box Beam; and Replace

Guardrail Post Assembly, Thrie Beam will be paid for at the Contract unit price for each. Payment will be

full compensation for removing and disposing of the designated post and hardware; for any necessary

excavation and backfill, including proper compaction; for furnishing, transporting, handling, and installing

the replacement post or backup plate if required; new bolts, nuts, washers and any other necessary

hardware; steel strapping as necessary; stain, paint, and preservative; and for furnishing all labor, tools,

equipment, and incidentals necessary for the work.

The accepted quantity of Steel Beam Guardrail; Steel Beam Guardrail with 8 Foot Posts; Steel Beam

Guardrail, Nested; Steel Beam Guardrail with 8 Foot Posts, Nested; HD Steel Beam Guardrail; HD Steel

Beam Guardrail with 8 Foot Posts; HD Steel Beam Guardrail, Nested; HD Steel Beam Guardrail with 8

Foot Posts, Nested; Thrie Beam Guardrail; and Box Beam Guardrail will be paid for at the Contract unit

price per linear foot. Payment will be full compensation for furnishing, transporting, handling, and placing

the materials specified; removing and disposing of damaged guardrail components; and for furnishing all

labor, tools, equipment, and incidentals necessary to complete the work.

The accepted quantity of Steel Beam Guardrail Offset Block; Terminal Connector for Steel Beam

Guardrail; Anchor for Steel Beam Guardrail; Anchor for Steel Beam Guardrail, MGS; Anchor for Steel

Beam to Box Beam Transition; and Traffic Barrier Delineator will be paid for at the Contract unit price

for each. Payment will be full compensation for furnishing, transporting, handling, and placing the

materials specified; removing and disposing of damaged guardrail components; and for furnishing all

labor, tools, equipment, and incidentals necessary to complete the work.

The accepted quantity of Guardrail Transition, Steel Beam to Box Beam will be paid for at the Contract

unit price per linear foot. Payment will be full compensation for detailing, furnishing, handling, placing,

delineating, and galvanizing the railing components, including W-beam sections requiring replacement;

and for furnishing all labor, tools, equipment, and incidentals necessary to complete the work.

621

The accepted quantity of Temporary Traffic Barrier will be paid for at the Contract unit price per linear

foot. Payment will be full compensation for furnishing and installing barrier and any required terminals

or protective end devices, and for removal and site restoration where required.

The accepted quantity of Temporary Traffic Protection will be paid for at the Contract unit price per linear

foot. Payment will be full compensation for furnishing, detailing, transporting, handling, and installing

the temporary traffic protection system, including, but not limited, to excavation, backfill, re-grading the

installation area as necessary, delineation devices, posts, blocks, terminals, and hardware, and for

furnishing all labor, tools, equipment, and incidentals necessary to complete the work. New guardrail

installed permanently on the project will be paid for separately under the appropriate Contract items.

Existing guardrail removed and not reset on the project, either temporarily or permanently, will be paid

for separately under the appropriate Contract items. Placement of barrels or other delineation devices for

the purpose of providing temporary traffic protection will not be paid for under this item but will be

incidental to the appropriate traffic control item.

The accepted quantity of Steek Backed Timber Guardrail will be paid for at the Contract unit price per

linear foot. Payment will be full compensation for furnishing, transporting, handling, and placing the

materials specified; removing and disposing of damaged guardrail components; enlarging holes as

necessary for placement of posts; furnishing and placing concrete fill and backfill material, and

compacting backfill to the satisfaction of the Engineer; and for furnishing all labor, tools, equipment, and

incidentals necessary to complete the work.

The accepted quantity of MTS of type specified; Box Beam Guardrail End Assembly, Type IIA; and

Guardrail Approach Section of the type specified will be paid for at the Contract unit price for each.

Payment will be full compensation for furnishing, detailing, transporting, handling, and installing the

terminal sections, assemblies, and approach sections used, including, but not limited to, excavation,

backfill, re-grading the installation area as necessary, delineation devices, restraining devices, hardware,

preservative treatment, and for furnishing all labor, tools, equipment, and incidentals necessary for

installing a complete and properly functioning unit.

The accepted quantity of Energy Absorption Attenuator, Temporary will be paid for at the Contract unit

price for each. Payment will be full compensation for fabricating, furnishing, transporting, handling, and

installing the materials required, including all hardware; any necessary manufacturer’s supervision; the

furnishing of all labor, tools, equipment, and incidentals necessary for installing the attenuator;

maintaining, repairing, or replacing the attenuator as necessary while it is in service; and for removing

and disposing of the attenuator when it is no longer needed.

621

The accepted quantity of Energy Absorption Attenuator, Permanent will be paid for at the Contract unit

price for each. Payment will be full compensation for fabricating, furnishing, transporting, handling, and

installing the materials required, including all hardware; any necessary manufacturer’s supervision; and

the furnishing of all labor, tools, equipment, and incidentals necessary for installing the attenuator,

complete and in place.

functioning to the satisfaction of the Engineer.

determined that the attenuator is no longer required for use at the original installed location.

of the barrier.

barrier.

installed barrier.

reinstallation of the barrier.

621

Payment will be made under:

Pay Item Pay Unit

00 Removal of Guardrail ...............................................................................Linear Foot

10 Removal of Guardrail Posts ......................................................................Each

20 Removal of Guardrail Offset Blocks ........................................................Each

00 Remove and Reset Temporary Traffic Barrier .........................................Linear Foot

10 Remove and Reset Guardrail ....................................................................Linear Foot

20 Adjust Height of Guardrail .......................................................................Linear Foot

00 Replace Guardrail Beam Unit, W-Beam ..................................................Each

60 Replace Guardrail Post Assembly, W-Beam with 6 Foot Posts ...............Each

80 Replace Guardrail Post Assembly, W-Beam with 8 Foot Posts ...............Each

00 Replace Guardrail Beam Unit, Box Beam ................................................Each

50 Replace Guardrail Post Assembly, Box Beam .........................................Each

00 Replace Guardrail Beam Unit, Thrie Beam ..............................................Each

50 Replace Guardrail Post Assembly, Thrie Beam .......................................Each

60 Steel Beam Guardrail ................................................................................Linear Foot

80 Steel Beam Guardrail with 8 Foot Posts ...................................................Linear Foot

60 Steel Beam Guardrail, Nested ...................................................................Linear Foot

80 Steel Beam Guardrail with 8 Foot Posts, Nested ......................................Linear Foot

60 HD Steel Beam Guardrail .........................................................................Linear Foot

80 HD Steel Beam Guardrail with 8 Foot Posts ............................................Linear Foot

621.1360 HD Steel Beam Guardrail, Nested ............................................................Linear Foot

80 HD Steel Beam Guardrail with 8 Foot Posts, Nested ...............................Linear Foot

00 Steel Beam Guardrail Offset Block ..........................................................Each

10 Terminal Connector for Steel Beam Guardrail .........................................Each

20 Anchor for Steel Beam Guardrail .............................................................Each

30 Anchor for Steel Beam Guardrail, MGS...................................................Each

40 Anchor for Steel Beam to Box Beam Transition ......................................Each

50 Guardrail Transition, Steel Beam to Box Beam .......................................Linear Foot

60 Traffic Barrier Delineator .........................................................................Each

621.2200 Thrie Beam Guardrail ...............................................................................Linear Foot

621.2300 Box Beam Guardrail .................................................................................Linear Foot

621.2400 Temporary Traffic Barrier ........................................................................Linear Foot

621.2500 Temporary Traffic Protection ...................................................................Linear Foot

621.2600 Steel Backed Timber Guardrail ................................................................Linear Foot

621

Pay Item Pay Unit

621.3020 MTS, MGS, Tangent, TL-2 ......................................................................Each

30 MTS, MGS, Tangent, TL-3 ......................................................................Each

621.3120 MTS, MGS, Flared, TL-2 .........................................................................Each

30 MTS, MGS, Flared, TL-3 .........................................................................Each

621.4020 MTS, Box Beam, Tangent, TL-2 ..............................................................Each

30 MTS, Box Beam, Tangent, TL-3 ..............................................................Each

621.4120 MTS, Box Beam, Flared, TL-2 .................................................................Each

30 MTS, Box Beam, Flared, TL-3 .................................................................Each

621.6021 Box Beam Guardrail End Assembly, Type IIA ........................................Each

621.7020 Energy Absorption Attenuator, Temporary, TL-2 ....................................Each

30 Energy Absorption Attenuator, Temporary, TL-3 ....................................Each

621.7120 Energy Absorption Attenuator, Permanent, TL-2.....................................Each

30 Energy Absorption Attenuator, Permanent, TL-3.....................................Each

621.8010 Guardrail Approach Section, Type I .........................................................Each

20 Guardrail Approach Section, Type II........................................................Each

30 Guardrail Approach Section, HD Steel Beam ..........................................Each

40 Guardrail Approach Section, HD Steel Beam with 8 Foot Posts .............Each

621.8120 Guardrail Approach Section, 2 Rail Box Beam ........................................Each

30 Guardrail Approach Section, 3 Rail Box Beam ........................................Each

40 Guardrail Approach Section, 4 Rail Box Beam ........................................Each

621.8230 Guardrail Approach Section, 3 Rail Box Beam, Curbless ........................Each

31 Guardrail Approach Section to 3 Rail Aluminum ....................................Each

32 Guardrail Approach Section to 3 Rail Aluminum, Pedestrian ..................Each

621.8320 Guardrail Approach Section to Concrete Bridge Rail, TL-2 ....................Each

30 Guardrail Approach Section to Concrete Bridge Rail, TL-3 ....................Each

621.9980 Guardrail Approach Section, Metal Truss Bridge ....................................Each

90 Guardrail Approach Section, Covered Bridge ..........................................Each

622

6-88SECTIO N 622 – INSULATIO N BOARD

622.0 1 DESCRIPTION . This work shall consist of furnishing and installing extruded or expanded polystyrene insulation board on a prepared surface. 622.0 2 MATERIALS . Materials shall meet the requirements of the following subsections: Sand Borrow and Cushion ................................ ................................ ......................... 703.03 Polystyrene Insulation Board ................................ ................................ ..................... 735.01 Skewers shall conform to the requirements of the insulation manufacturer. 622.0 3 PREPARATIO N OF SURFACE . The s urface shall be prepared as follows:

unsuitable material shall be replaced with satisfactory material . The surface shall be compacted to attain at least 95% of the maximum dry density and the in -place moisture content shall be not more than 2% above the optimum moisture content, as determined by AASHTO T 99, Method C .

just prior to the placement of the insulation board.

622.0 4 PLACEMEN T OF INSULATION . The insulation board shall be placed and secured as follows:

layers of insulation are used, the second shall be placed to cover the joints of the first layer.

board in place. The skewers sh all be driven at an angle of less than 90° from the horizontal until flush with the surface of the insulation boards. Skewers shall be used for each layer when more than one layer of material is used.