Civil Engineering


Date of this Version





Faller et al.


Three full-scale vehicle crash tests were conducted on the Iowa Retrofit Concrete Barrier Rail. Test 12-1 with a 1,849 lb. vehicle at 20 deg. and 56.8 mph. was conducted Test 12-2 was conducted with a 5,386 lb. vehicle at 20 deg. and 62.3 mph. Test 12-3 was conducted with an 1,849 lb. vehicle at 20 deg. and 62.5 mph. The total length of the installation was 100 ft. It consisted of 86 ft. of standard retrofit concrete barrier rail section and 7 ft. of concrete endwall section on each end of the standard retrofit section. Two construction joints were located 35 f t. inward from both ends of the installation. The bride rail consisted of three major components: the existing concrete curb, the rectangular (retrofit) concrete wall section. and the concrete endwalls. The overall height of the barrier was 32-in. above the roadway surface. The 86 ft. long, retrofit concrete barrier rail was doweled into the existing concrete curb and setback 3-in. from the curb face. The location of the vehicle impacts were set at IS-in. both of the construction joints. from The tests were evaluated according to the safety criteria in NCHRP 230 and also in the AASHTO guide specifications. The safety performance of the Iowa Retrofit Concrete Barrier Rail was determined to be satisfactory.