Mechanical Property of Cement-stabilized Soil with Nano- CaO and Reinforcement Mechanism Analysis

Nanometer minerals as new additives can improve the property of the cement-stabilized soil through some previous researches. Nano-CaO, which has rarely been attempted in admixtures of cemented soft clays for now, was mixed into Tianjin soft clay combined with cement. The unconfined compression tests were carried out to find out the mechanical property of the cemented soil after cured for appropriate days. Additionally the test results were compared with the cemented soil containing other nanometer minerals to clarify the reinforcement effect furthermore. The results show that the strength and the brittleness of cemented soil increases first and then decreases, and the deformation modulus has opposite variation trend with the content of nano-CaO. Compared with other nanometer minerals, the reinforcing effect is similar to nanometer aluminium powder. It can be concluded that if the minerals could improve the strength originally in chemistry, the nanometer treatment can upgrade the chemical reactivity, and improve the strength of cemented soil.