Section 618 — Concrete Barriers

Description

618.01This work consists of constructing concrete barrier systems. This work also consists of removing and resetting concrete barrier systems.

Material

618.02Conform to the following Subsections: Backer rod 712.01(f) Guardrail hardware 724.04 Joint sealants and crack fillers 712.01(a) Precast concrete units and accessories 725.09 Preformed expansion joint fillers 712.01(b) Reinforcing steel 709.01

Construction Requirements

618.03General. Excavate and backfill according to Section 209. Construct barriers that are crashworthy . Construct temporary terminal sections and crash cushions according to Section 635.

618.04Concrete Barriers. Concrete barriers may be cast -in-place, slip -formed, or precast according to Section 552 or Section 578. Finish the sides and top according to Subsection 552.14(a) .

(a)Cast -in-place. Tool or saw cut contraction joints ¼ inch wide and 2 inches deep at 20 -foot intervals. Saw cut after the concrete has set sufficiently, but before shrinkage cracking occurs. Decrease the depth of the saw cut at the edge adjacent to the pavement to prevent pavement damage. Place ¾ -inch preformed expansion joint filler in construction joints. Cut the joint filler to fit the cross- sectional area at structures and barrier construction joints. Tool construction joint edges. Seal joints accord ing to Subsection 501.11.

(b)Slip-formed. Do not contact extruded concrete surface as it leaves the slip -form machine, except to remove offsets and fins by light troweling. Adjust the operation to correct conditions causing surface blemishes larger than ½ inch. Do not use water on the completed barrier to correct imperfections.

(c)Precast. Precast barriers in section lengths. Prepare the barrier foundation so it does not vary over ¼ inch when a 10-foot metal straightedge is laid along the centerline of the barrier. Align the joints and connect adjacent sections. Use cast -in-place barrier where transitions, split barriers, or gaps shorter than 10 feet require it. At each joint between precast and cast -in-place barrier, provide hardw are in the cast -in-place section to tie its end to the abutting precast section.

618.05Removing and Resetting. Salvage the existing concrete barrier, terminal sections, and appurtenances according to Subsect ion 203.04. Reset concrete barrier and terminal sections according to Subsections 618.03 and 618.04. Replace concrete barrier, terminal sections, and hardware damaged during removal, storage, or resetting.

618.06Acceptance. Material for concrete barrier (except concrete and reinforcing steel) will be evaluated under Subsections 106.02 and 106.03. Construction of concrete barriers will be evaluated under Subsections 106.02 and 106.04. Concrete will be evaluated under Section 552. Excavation and backfill will be evaluated under Section 209. Reinforcing steel will be evaluated under Section 554. Temporary terminal sections and crash cushions will be evaluated under Section 635.

Measurement

618.07Measure the Section 618 pay items listed in the bid schedule according to Subsection 109.02 and the following as applicable: Measure concrete barrier excluding terminal sections. Measure reset concrete barrier in the relocated position including terminal sections.

Payment

618.08The accepted quantities wi ll be paid at the contract price per unit of measurement for the Section 618 pay items listed in the bid schedule. Payment will be full compensation for the work prescribed in this Section. See Subsection 109.05 .