STRENGTH ANALYSIS OF CEMENT-TREATED DREDGED SOIL USING X-RAY DIFFRACTION METHOD

Authors have developed a technology to utilize dredged soil with high water content as a high-strength block by cement mixing and high-pressure dehydration. In this paper, we investigated cement hydration products quantified by X-ray diffraction method and strength properties by uniaxial compression test. The results obtained from this study are summarized as follows. (1) For the cement content of 40%, there was a strong correlation between unconfined compressive strength of cement-treated soil and the mass percentage of Ca(OH)2, which is one of the cement hydration products, with R2 = 0.82. The unconfined compressive strength increased up to 14.6 MPa when the mass proportion of Ca(OH)2 increased up to 6.3%. (2) For the cement content of 80%, there was a strong correlation between unconfined compressive strength of cement-treated soil and the mass percentage of Ca(OH)2 with R2 = 0.82. The unconfined compressive strength increased up to 20.9 MPa when the mass proportion of Ca(OH)2 increased up to 1%.