Proceedings of the Deep Mixing 2015 Conference, (DFI)
Strength Behavior of Soilcrete Improved by Cement and Metakaolin
Qian Guo, Southeast University, China; Yongfeng Deng, Southeast University, China; Songyu Liu, Southeast University, China; Guangyin Du, Southeast University, China; Ningping Wang, Southeast University, China
Metakaolin (MK) can efficiently enhance the strength and the impermeability of concretes and mortars. However, it has rarely been attempted in admixtures of cement-stabilized soils until presently. As deep mixing method is wildly used in ground improvement, the strength of cemented soils (soilcrete) and the applicability of the MK should be considered. This paper focuses on the macro-strength development of cement-stabilised silty soil mixed with MK. The result shows that the addition of MK can enhance the unconfined compressive strength of the soilcrete, which attributes to a combination of the rates of OPC hydration and the MK-CH reaction. Note that the strength of soilcrete was influenced by the properties of soil, water-to-binder mass ratio (W/B) in admixtures, which needs to be reconsidered since the binder mass composes that of cement and MK totally.
|article #2107; publication #1013 (DM-2015)|