TEMPORARY IMPACT ATTENUATOR SECTION 809
446 SECTION 809 — TEMPORARY IMPACT ATTENUATOR
809.1Description.
This work consists of providing, installing, relocating, maintaining, and removing temporary impact attenuators (TIA).
809.2Materials.
Not applicable.
809.3Construction.
809.3.1 Equipment.
A.TIAs.
1.Provide TIAs of the type specified in the contract in accordance with Section 724.
2.Provide ASTM D4956 Type IV retroreflective sheeting on the nose of the TIA facing traffic.
Provide sheeting with:
a.Alternating 3 -inch minimum wide yellow and black stripes;
b.stripes positioned at a 45 -degree angle pointing down towards the side where traffic will pass
the impact attenuator; and
c.covering the entire TIA nose.
3.Meet MASH crash testing requirements .
4.Select TIAs from the Design Resource Center Approved Products List.
5.Provide the engineer with a written description of the TIAs planned for use. Submit TIA shop
drawings and manufacturer’s installation instructions.
6.Provide and maintain the availability of 1 complete stand -by replacement TIA of each type used
at a location approved by the engineer .
B.Sand Crash Cushions.
1.Provide sand crash cushions in accordance with the contract consisting of an array for the design
speed of the roadway.
2.Use sand crash cushions only when specified in the contract or approved by the engineer.
3.For the sand and salt mixture in sand crash cushions, provide:
a.Clean, loose sand with a density of 100 pounds per cubic foot and a moisture content of no
more than 3 percent.
b.A mixture in accordance with manufacturer’s recommendations. If no recommendations are
available, the mixture must contain 10 to 20 percent rock salt by volume.
c.Certification to the engineer that the sand and salt mixture meets these requirements before
installing the sand crash cushion array.
4.Provide 1 complete stand -by replacement sand crash cushion array.
809.3.2 TIA and Sand Cushion Placement, Repair, Relocation, and Removal. TEMPORARY IMPACT ATTENUATOR SECTION 809
447 A. Place TIAs in accordance with Section 724, at the locations specified in the contract, or as directed by the engineer.
B.Repair TIAs in accordance with manufacturer’s requirements within 24 -hours of damage
notification. Provide written certification of repairs. Replace if necessary.
C.Relocate TIAs by removing anchor pins completely from the pavement and filling the remaining
holes with approved epoxy material. Do not cut pins flush with pavement. Provide written certification, from installers certified by the TIA manufacturers, of p roper TIA relocation.
D.Remove TIAs by removing anchor pins completely and filling the remaining holes with approved
epoxy material. Do not cut the anchor pins flush with the pavement.
E.Install sand crash cushions in accordance with the manufacturer’s instructions.
F.Replace damaged cushions within 24 -hours of damage notification. Refer to the manufacturer’s
recommendations for full or partial replacement of the array.
809.4Method of Measurement.
A.The Department will measure TIAs as the number of TIAs provided, placed, and accepted.
B.The Department will measure sand crash cushions as the number of individual sand crash cushion
barrels provided and accepted, regardless of barrel weight.
C.The Department will measure the number of damaged and replaced sand crash cushions as the
number of barrels replaced and accepted, regardless of barrel weight.
809.5Basis of Payment.
A.The Department will pay for providing TIAs at the contract unit price per EACH. Price and payment
constitutes full compensation for :
1.Providing each type of TIA specified in the contract ; and
2.providing 1 stand by replacement for each type of TIA specified in the contract.
B.The Department will pay for installing TIAs at the contract unit price per EACH. Price and payment
constitute full compensation for:
1.Installing or removing a TIA system; and
2.repairing or replacing damaged TIAs .
C.The Department will pay for relocating TIAs at the contract unit price per EACH. Price and
payment constitute full compensation for relocating and installing a TIA system.
D.The Department will pay for providing sand crash cushion barrel at the contract unit price per
EACH. Price and payment constitute full compensation for:
1.Providing individual sand crash cushion barrels with sand and salt mixture; and
2.providing 1 complete stand -by replacement array .
E.The Department will pay for installing sand crash cushion barrel at the contract unit price per
EACH. Price and payment constitute full compensation for installing or removing sand crash cushion barrels.
F.The Department will pay for relocating sand crash cushion barrel at the contract unit price per
EACH. Price and payment constitute full compensation for relocating sand crash cushion barrels. TEMPORARY IMPACT ATTENUATOR SECTION 809
448 G. The Department will pay for replacing sand crash cushion barrel at the contract unit price per EACH. Price and payment constitute full compensation for:
1.Replacing damaged sand crash cushion barrels;
2.removing and disposing of damaged barrels; and
3.installing new barrels.
ITEM DESCRIPTION UNIT 809001 INSTALL TEMPORARY IMPACT ATTENUATOR EACH 809002 PROVIDE TEMPORARY IMPACT ATTENUATOR – GATING, NON -REDIRECTIVE, TEST - LEVEL 2 EACH 809003 PROVIDE TEMPORARY IMPACT ATTENUATOR – GATING, NON -REDIRECTIVE, TEST - LEVEL 3 EACH 809004 PROVIDE TEMPORARY IMPACT ATTENUATOR – NON -GATING, REDIRECTIVE, TEST - LEVEL 2 EACH 809005 PROVIDE TEMPORARY IMPACT ATTENUATOR – NON -GATING, REDIRECTIVE, TEST - LEVEL 3 EACH 809006 RELOCATE TEMPORARY IMPACT ATTENUATOR EACH 809007 PROVIDE SAND CRASH CUSHION BARREL EACH 809008 INSTALL SAND CRASH CUSHION BARREL EACH 809009 RELOCATE SAND CRASH CUSHION BARREL EACH 809010 REPLACE SAND CRASH CUSHION BARREL EACH 809011 PROVIDE TEMPORARY IMPACT ATTENUATOR - WIDE BAY, NON -GATING, REDIRECTIVE , TEST -LEVEL 2 EACH 809012 PROVIDE TEMPORARY IMPACT ATTENUATOR - WIDE BAY, NON -GATING, REDIRECTIVE , TEST -LEVEL 3 EACH
Source: Delaware Standard Specifications for Road and Bridge Construction, 2025 Edition. Pages 456–458 of 779.