Stabilization of Soft Bangkok Clay Using Cement Mixed with Iron Slag Powder and Paper Manufacturing Biomass Ash

Abstract

This study aims to evaluate potential uses of iron slag powder and biomass ash which are obtained from steel and paper manufacturing, respectively. These two materials were then mixed with cement to improve soft Bangkok clay based on the Geo – environmental of engineering viewpoint. The most suitable ratio of cement, iron slag and biomass ash are shown to be 0.750, 0.125 and 0.125, After that, the mixed binders are mixed with soil using ratios of 150, 200 and 250 kg/m3. The test results reveal that soil strength are significantly improved as evaluated using Unconfined Compressive Strength (UCS) and California Bearing Ration (CBR). Also, the strengths of cementitious treated soft soils increase markedly with curing time. The testing of physico-chemical properties by using X-Ray Diffractometer (XRD), therefore, confirmed that industrial wastes in this study have potential uses as cementing material for improving the soft Bangkok clay, the strengths of which conformed to the criteria to be used as Construction material.