KUAT GESER DAN DAYA DUKUNG TANAH RESIDU YANG DISTABILISASI DENGAN SEMEN (2022)

Hatmoko, John Tri and Jati, Dinar Gumilang KUAT GESER DAN DAYA DUKUNG TANAH RESIDU YANG DISTABILISASI DENGAN SEMEN (2022). [Research] (Unpublished)

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Abstract

vi ABSTRACT Unlike sediment soil, residual soil has low cohesion, low friction angle. low bearing capacity and is not stable. The physical properties of residual soil is mostly determined by its composition such as grain composition, the grain formation, and mineral composition, rather than its stress history. Chemical and physical weathering generate specific clay mineral with special structure, and probably there is cementation process on the soil particle. Besides containing clay minerals such as illite, kaolinite and montmorillonite, the residual soil contains also hallosyte and hallopane. Those effects are more important rather than stress history occurred on the soil deposits. Therefore, soil stabilization of residual soil is different from that on sedimented soil. The purposes of this research is to improve the shear strength parameters ( cohesion and friction angle) and soil bearing capacity of residual soil stabilized with ordinary Portland Cement (OPC). The residual soil was taken from Wonogiri Regency, The province of Mid Java. The soil is red- color due to chemical weathering. The preliminary experiment that was performed in the Laboratory were water content, specific gravity, grain size distribution, Atterberg limits, shear strength of the original soil. The oven-dried residual soil was then mixed with 3, 5, 10, 15 and 20% OPC. The optimum water content was added to the mix. Then, the blend were cured with 7, 14, 21, 36 and 56 curing period. Each specimen was tested on the direct shear apparatus to verify the improvement of shear strength and shear strength parameters of cement stabilized residual soil. To study the improvement of bearing capacity, the methods of Terzaghi and Meyerhof were used to calculate the bearing capacity of cement stabilized residual soil. The results indicate that even though residual soil stabilization is different from that of sedimented soil stabilization , the shear strength parameters , shear strength and bearing capacity of stabilized residual soil improve with respect to both cement quantity and curing period. In low cement content and short time of curing, there is no improvement of shear strength and bearing capacity. The significant improvement can be verified on high binder proportion (15 to 20%) and long curing period : 56 days of curing. The results of bearing capacity analysis indicate that the bearing capacity value of Meyerhof method was larger than that of Terzaghi method.

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