关键词: 粉细砂水泥土, 无侧限抗压强度, 变形模量, 渗透系数, 水泥掺入比

Abstract:

A series of laboratory tests on cement-stabilized fine sand were carried out to research its properties of strength, deformation, and permeability. Various factors such as cement mixing ratio, admixture ratio, sample preparation mode, and age were taken into account in the tests. Results revealed that the compressive strength of cement-stabilized soil increases with cement mixing ratio in a trend which can be described as a quadratic parabolic function. The compressive strength of cement-stabilized soil also increases with age, and the relation between them fits logarithmic curves fairly well. Bentonite and water reducing agent have very small influence on the strength and deformation properties, but bentonite helps reduce the permeability coefficient of cement-stabilized fine sand. Expressions of the empirical relations respectively between compressive strength and cement mixing ratio, strength and age, deformation modulus and age, deformation modulus and compressive strength, permeability coefficient and age, were suggested, which serve as the basis of mix proportion design and parameter prediction for cement-stabilized soil.

Key words: cement-stabilized fine sand, unconfined compressive strength, deformation modulus, permeability coefficient, cement mixing ratio