MASH TL-4 Evaluation of Flared Cast-In-Place Concrete Barrier

Report Number(s): 611901-06

Description: The installation consisted of a 75 ft long, 40-inch tall reinforced concrete single slope median barrier that flared 18 inches wider in its intermediate segment. Each upstream and downstream segment was 18 ft 9 inches long, 23¼ inches wide at bottom, and sloped up on both sides to 8 inches wide at the top . The intermediate flared section maintained the same single slope and each measured 4 inches wide at top. The upstream segment flared outward at a 20:1 ratio for 15 ft in length. The downstream segment flared back inward at a 30:1 ratio over a length of 23 ft. The flared sections were connected to each other with ½ inch diameter galvanized rods, and the void between them was filled with uncompacted coarse aggregate. Multiple ¾-inch diameter rebar anchor rods embedded 6 inches deep and secured with epoxy were used to anchor the barrier sections to the existing concrete apron.

Test Level: 4

Barrier Type: Single Slope

MASH Test Number: 4-10, 4-11, 4-12

Proprietary/Non-proprietary: Non-proprietary

Pass/Fail: Pass

Evaluation: Full-Scale Crash Testing

Sponsor: Roadside Safety Research Program Pooled Fund