期刊
CEMENT AND CONCRETE RESEARCH
卷 33, 期 6, 页码 793-798出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0008-8846(02)01068-2
关键词
pore solution; electrical properties; transport properties; alkalis; modeling
A proposed method for estimating the electrical conductivity of cement paste pore solution at 25 degreesC is based on the concentrations of OH-, K+ and Na+. The approach uses an equation that is a function of the solution ionic strength, and requires a single coefficient for each ionic species. To test the method, the conductivity of solutions containing mixtures of potassium hydroxide and sodium hydroxide with molar ratios of 4:1, 2:1 and 1:1, and having ionic strengths varying from 0.15 to 2.00 mol/l were measured in the laboratory and compared to predicted values. The proposed equation predicts the conductivity of the solutions to within 8% over the concentration range investigated. By comparison, the dilute electrolyte assumption that conductivity is linearly proportional to concentration is in error by 36% at 1 mol/l and in error by 55% at 2 mol/l. The significance and utility of the proposed equation is discussed in the context of predicting ionic transport in cement-based systems. Published by Elsevier Science Ltd.
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