不同水灰比水泥固化黏土的强度特性试验研究

采用水泥固化流塑态黏土(SDF)作为围海垦地的填料,可有效解决环境污染和资源短缺问题,实现资源环境的可持续发展。目前,水泥固化黏土的基本强度特性还没有统一的定论。本文基于室内试验,测定了不同配合比条件下SDF无侧限抗压强度,分别研究了水泥剂量A_w和水灰比W/A_w参数对SDF强度特性的影响。试验结果表明:当A_w较低时,强度随A_w呈非线性增长,随着A_w的增加,其变化曲线逐渐向线性转变;不同类型土,其强度随A_w的变化曲线由非线性向线性转变的临界点不一致;W/A_w对不同类型SDF强度的影响程度不一致;归一化方法可部分消除黏土类型等因素变化引起的强度变异。

Experimental Research on Strength Characteristics of Cement-Stabilized Clay with Different Water-Cement Ratio

An ideal solution for disposal unwanted dredged clays is to stabilize and use them as filling material. This idea can be used to effectively solve the issues of environmental pollution and resources scarcity, and achieve sustainable development. However, so far, the strength behavior of this kind of fill materials (referred to as SDF from hereon) is still uncertain. In this study, a series of laboratory tests are conducted to acquire the unconfined compressive strengths (q_u) of SDF with different mixing proportions. The influence of cement content (A_w) and water-cement ratio (W/A_w) on the strength behavior of SDF are separately investigated. Experimental results indicate that the increase in q_u is nonlinear with A_w, when the A_w is low, and it gradually changes to linear with the increasing of A_w. The critical cement content for the change is different with various soil types. Using W/A_w to describe the strength behavior of SDF is different to various types of SDF. The normalization approach can partly reduce the dependency of influencing factors, such as the soil type.