Study on hydration of Portland cement with fly ash using electrical measurement

被引:23
作者
X. Wei
Z. Li
机构
[1] The Hong Kong University of Science and Technology,Department of Civil Engineering
[2] Huazhong University of Science and Technology,Department of Civil Engineering
关键词
Compressive Strength; Electrical Resistivity; Portland Cement; Ettringite; Cement Paste;
D O I
10.1007/BF02479309
中图分类号
学科分类号
摘要
The electrical resistivity method was used for measuring the electrical resistivity of cement paste incorporating with fly ash. The study found that the bulk electrical resistivity ρ(t) was a function of the solution electrical resistivity ρ0(t) and porosity Φ. A two-component model was proposed, in which ρ(t) was dominated by ρ0(t) at the early period of hydration and dominated by Φ at a later period. The porosity formation curve was derived from the 2-point method. A logarithmic equation ρ(t)=K*In(t/t0) was proposed to express the electrical resistivity development with time after hardening, where K represents the rate of hydration, and the pastes with fly ash had a lower K. The setting times and compressive strengths were tested and the results were compared with the electrical properties.
引用
收藏
页码:411 / 417
页数:6
相关论文
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