李育超 杨佳林 兰吉武 黄根清

摘   要：采用压电陶瓷弯曲元测试矿渣-水泥-膨润土（S-CB）试样剪切波速的方法，研究了复合胶凝材料含量、矿渣替代率、龄期对S-CB的剪切波速（Vs）与剪切模量（G0）的影响规律. 试验结果表明，S-CB的Vs随龄期的增长、矿渣替代率的减小、复合胶凝材料含量的增大而增大;试验中，S-CB的Vs明显低于同龄期水泥土的Vs，这主要归因于S-CB含水量显著高于水泥土;发现S-CB的硬化发展规律与矿渣替代率紧密相关，与复合胶凝材料含量相关性不明显，基于试验结果提出了矿渣-水泥-膨润土的剪切模量随龄期的预测公式，若测试获得某一复合胶凝材料含量的矿渣-水泥-膨润土的归一公式，可推测相同矿渣替代率的其他复合胶凝材料含量的矿渣-水泥-膨润土的剪切模量.

关键词：矿渣-水泥-膨润土;剪切波速;剪切模量;龄期效应;弯曲元

中图分类号：TU47;X50                          文献标识码：A

文章编号：1674—2974（2019）09—0133—08

Abstract： The shear wave velocity of slag-cement-bentonite （S-CB） samples by piezoelectric bending element was tested to study the influence of cementitious material content，slag substitution rate and age on shear wave velocity （Vs） and shear modulus （G0）. The test results showed that， with the increase of age， decrease of slag substitution rate and increase of content of cementitious material， shear wave velocity （Vs） of S-CB increased. In the tests， Vs of S-CB is significantly lower than that of cemented clay at the same age. This is mainly due to the higher water content of S-CB than cemented clay. It is observed that the development tendency of S-CB is closely related to the slag substitution rate of cementitious material， and it is not obviously correlated with the content of cementitious material. Based on the test results， the prediction formula for shear modulus of cement-bentonite with age was proposed. If the normalized formula of S-CB with one kind of cementitious material content is obtained by test， the shear modulus of S-CB with other composite cementitious materials content and the same slag replacement rate can be speculated.

Key words： slag-cement-bentonite;shear wave velocity;shear modulus;age effect;bender element

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