Experimental Field Project on Bituminous Stabilization of Silty Soils: Final Report

An experimental field project was constructed in southeastern Minnesota 1965 to evaluate the effectiveness of stabilizing the upper portion of a silty subgrade with two different bituminous materials, RT-6 and MC-2. The project contained six sections in which the upper 6 inches of the subgrade was stabilized with bituminous material and capped with 3 or 5 inches of gravel. Two unstabilized control sections were designed with a 7-in. gravel base. The best performing stabilized section was on a par with the control sections, but was much more costly. The relative performance of the stabilized sections could be related to results from laboratory tests conducted on similar soil-bituminous mixtures.