Multi-blend soil stabilizer

The effect of fly ash on the strength and deformation characteristics of soft clay is discussed in the paper. Lime or cement has been added as secondary constituents to further enhance self-hardening of the blended mix. For example, unconfined compression tests reveal that after two weeks of curing, a 18% fly ash and a 5% lime treated soft Clay attains a compressive strength 2-3 times greater than that of the natural clay. However, if lime is replaced by cement, the initial rate of strength development increases significantly. Excessive fly ash contents (greater than 25%) cause tensile splitting of unconfined specimens. The compressibility of fly ash--cement treated soil is considerably less than that of the natural clay. As the fly ash content exceeds 10% for a constant cement content of 5%, the increase of the equivalent yield pressure becomes significant. The reduction in compressibility is also associated with a corresponding increase in the coefficient of consolidation. The main aim of this paper is to determine the performance of PFA,OPC and lime as soil stabilizers when combined together.