MASH08 Test 3-11 of the Rockingham Precast Concrete Barrier

The purpose of the testing reported herein is to assess the performance of the Rockingham Pre-Cast T-Lok F-shape Barrier according to the safety-performance evaluation guidelines included in the update to NCHRP Report 350 (referred to as MASH08). The proposed crash test for this project was in accordance with Test Level 3 (TL-3) of MASH08, which involves the new 2270P vehicle (a 5000 lb (1/2 ton) Quad Cab Pickup) impacting the barrier at its critical impact point at a speed of 62 mi/h and an angle of 25 degrees. The individual barrier units of the Rockingham Pre-Cast T-Lok F-shape Barrier were 12 ft in length and 32 inches in height. The T-Lok barriers were connected together using a proprietary connection system that is constructed at each end of the barrier units. The total length of the test installation was approximately 192 ft. The T-Lok F-Shape Barrier unit utilizes an interlocking "T" connection anchored within a slotted steel tube. Each barrier unit consisted of a steel "T" connection anchored to one end of the unit with a slotted tube connection anchored to the other end. The slotted tube connection (HSS4x4x1/2) was 12 inches in length and was anchored to the end of the barrier units with reinforcing steel welded to the sides of the slotted tube. The interlocking "T" connection was fabricated using ½-inch thick steel plate. The width and length of the "T" connection was 2 inches and 12 inches, respectively. The "T" connection was anchored to the ends of the barrier with reinforcing steel welded to the "T" connection. These bars, along with the bars welded to the slotted tube connection, were cast within the barrier concrete for each unit. The Rockingham precast concrete median barrier with T-Lok connection performed acceptably according to the requirements for MASH08 test 3-11.