Cement-based grout has been used for ground improvement. Owing to environmental issues related to cement, its usage should be reduced. In this study, an inorganic binder is introduced to reduce the use of cement in grout. To evaluate the transient electrical and mechanical properties of the sand–cement admixture samples improved with the addition of inorganic binders, two non-destructive testing methods, the electrical resistivity and free–free resonant column tests, were adopted in addition to the unconfined compressive strength (UCS) test. Experimental tests were performed considering four different mixing ratios and three different cement contents, depending on the curing time. The results show that the mixing ratio and curing time have considerable effects on the electrical and mechanical properties of the mixture. The UCS decreases as the cement content decreases. However, sufficient UCS is expected to be obtained when the inorganic binder content is increased in the mixture. From the results, it is found that geotechnical properties of the mixture can be estimated in the field with proper non-destructive testing methods. It is expected that the data and trends proposed in this study can be used as a reference in predicting grouting quality in the field.

中文翻译：

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砂-水泥-无机粘结剂混合物的电阻率和弹性波速度

水泥基灌浆已用于地面改良。由于与水泥有关的环境问题，应减少其用量。在这项研究中，引入了一种无机粘合剂以减少水泥在水泥浆中的使用。为了评估通过添加无机粘合剂改善的砂水泥混合物样品的瞬态电气和机械性能，除了无侧限的抗压强度外，还采用了两种无损检测方法，即电阻率和自由共振柱测试（UCS）测试。根据固化时间，考虑了四种不同的混合比和三种不同的水泥含量进行了实验测试。结果表明，混合比和固化时间对混合物的电气和机械性能有相当大的影响。随着水泥含量的降低，UCS降低。但是，当混合物中无机粘合剂的含量增加时，有望获得足够的UCS。从结果发现，可以通过适当的无损检测方法在现场估算混合物的岩土性能。可以预期，本研究中提出的数据和趋势可以作为预测现场灌浆质量的参考。