Effect of the cement on the swell and CBR behavior of silty soil = Ảnh hưởng của xi măng đến ứng xử trương nở và giá trị CBR của đất bùn lòng sông

Abstract

This study evaluates the use of cement to improve riverbed soil for road embankments. Riverbed soil, though abundant, exhibits low strength and high swelling potential. Cement was added at 3%, 5%, and 10% by weight. Results showed that cement significantly reduced swell potential from 4.4% (untreated) to 1.78% (10% cement) and accelerated swelling equilibrium. Additionally, the California Bearing Ratio (CBR) improved markedly, increasing up to 3.78 times at 10% cement. The most substantial CBR gain occurred between 3% and 5% cement, with diminishing returns thereafter. The improvements are attributed to pozzolanic and hydration reactions enhancing soil bonding.