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http://dx.doi.org/10.5345/JKIBC.2014.14.1.110

A Study on the Estimation of Autogenous Shrinkage of High Strength Mortar incorporating Mineral Admixture by Equivalent Age Method  

Han, Min-Cheol (Department of Architectural Engineering, Cheong-Ju University)
Publication Information
Journal of the Korea Institute of Building Construction / v.14, no.1, 2014 , pp. 110-117 More about this Journal
Abstract
The objective of this study is to investigate an effect of curing temperature on autogenous shrinkage of high strength cement mortar with 0.15 of W/B incorporating fly ash and silica fume in terms of equivalent age. The contents of fly ash and silica fume are varied from 10% to 30%. Non linear regression model applying equivalent age was used to estimate the autogenous shrinkage evolution. To obtain apparent activation energy($E_a$), setting time method by Pinto and existing method were calculated and compared respectively. Test results showed that use of silica fume increased autogenous shrinkage while use of fly ash decreased it. It was also found that poor agreements were obtained when $E_a$ by setting time was applied. But, application of existing $E_a$ resulted in a good agreement between calculated autogenous shrinkage and measured one.
Keywords
autogenous shrinkage; equivalent age; fly ash; silica fume; apparent activation energy;
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