Strength and Equivalent Modulus of Cement Stabilized Lateritic with Partial Replacement by Fly Ash and Rice Husk Ash

The effect of industrial/agricultural waste materials including fly ash (FA) and rice husk ash (RHA) as Portland cement replacement on properties of stabilized lateritic soil as a road construction material is investigated. The compacted lateritic soil samples treated with Portland cement at 1%, 2% and 3% by weight of the dry soil and three different amounts (10%, 20% and 30%) of FA and RHA for replacing cement are prepared and the unconfined compression and cyclic loading tests are conducted on 28 days curing samples. The equivalent modulus (Eeq) defined as the average linear portion from the unloading/reloading cycles, is used to quantify the effects of stress level on the cyclic resistance of the treated lateritic. Based on the compressive strength results, both replacement materials have demonstrated potential applications in lateritic soil stabilization. Overall, the RHA shows a better efficiency than FA for replacement particularly at 2% cement content. Based on cyclic loading tests, the Eeq values increase as the stress level increases for all samples. The FA and RHA notably enhance the Eeq values of cement treated lateritic.