| Cement-soil with low price, convenience and not restricted by area has been widely used in engineering. It is very effective in treating weak foundation by deep cement mixing method, cement mixing piles and rotating spouting piles, etc. However, it has been restricted in application because of some problems such as excessive deformation and less carrying capacity. All kinds of the application of the additive agent has improved the situation.Research shows that the application of the additive agent has improved the performances of cement-soil, such as its characteristics of deformation and strength, its permeability, and so on.It is common that silica power, fly ash and other grain material as the additive agent has been applied to cement-soil at present. All walks of life has been struggling to the application of nano-particals and has won the great achievements since the discovery of nano-materials. It is a new exploration to study the modification function of the nano-particles as a kind of additive agent into cement-soil under this tendency.In this paper,we separately added the nano-SiO2, nano-Al2O3 and nano-montmorillonite into cement-soil as the admixtures. By the unconfined compressive strength tests and the consolidation tests, we studied the influence of various factors on the unconfined compressive strength and the compressibility of cement-stabilized soil, and its mechanism. The influence of various factors include the variety and content of nano-particals, the age, the content of cement, the water-to-binder (the sum of cement and nano-particals) ratio. It provides the theoretical basis for the application of nano-particals in the cement-soil. |
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