Evaluation of Resilient Modulus for Lime- and Cement-Stabilized Synthetic Cohesive Soils

Abstract

The effects of deviator stress, molding moisture content, stabilizer type and content, curing period, and soil type on the resilient modulus (M r ) of lime- and cement-stabilized cohesive soils were investigated by using Hydrite R (kaolinite) and sodium bentonite (montmorillonite) blends. It was found that M r increases with decreasing deviator stress, increasing lime and cement content, and extended curing period. Moisture variations around optimum had little effect on M r with higher lime contents. Multiple regression analyses and Student's t-tests indicated that all the factors investigated were significant and could be related to M r by predictive regression equations. For a given stabilizer type and content, the low-plasticity clay (CL) soil produced the best results. The cement-stabilized CL soil normal cured for 28 days produced the highest M r value. However, cement stabilization was not found to be very effective for the high-plasticity clay (CH) soil. Mineralogical composition has a marked effect on the M r of lime and cement-stabilized cohesive soils. Kaolinitic CL soils work better than montmorillonitic CH soils with both lime and cement.