Abstract
In recent years more and more attention has been given to autogenous shrinkage due to the increasing use of high-performance concrete, which always contains supplementary materials. With the addition of supplementary materials—e.g., fly ash and blast furnace slag—internal relative humidity, chemical shrinkage and mechanical properties of cement paste will be affected. These properties significantly influence the autogenous shrinkage of cement paste. In this study, three supplementary materials—i.e., silica fume, fly ash and blast furnace slag—are investigated. Measurements of final setting time, internal relative humidity, chemical shrinkage, compressive strength and autogenous deformation of the cement pastes with and without supplementary materials are presented. Two water-binder ratios, 0.3 and 0.4, are considered. The effects of different supplementary materials on autogenous shrinkage of cement paste are discussed.
Highlights
In recent years, high-performance concrete, which always contains supplementary cementitious materials, has been increasingly used in practice
In order to better study the effect of different supplementary materials on the autogenous shrinkage of cement paste, which is useful for the better prediction of autogenous shrinkage of high-performance concrete that always contains supplementary materials, measurements of final setting time, internal relative humidity, chemical shrinkage, compressive strength and autogenous deformation of cement paste with various supplementary materials are presented and discussed in this paper
The drop in internal relative humidity of cement paste does not increase with the addition of dry densified silica fume and, the autogenous shrinkage of silica fume cement paste is not significantly bigger than that of ordinary Portland cement paste with same water–binder ratio
Summary
High-performance concrete, which always contains supplementary cementitious materials, has been increasingly used in practice. The study of autogenous shrinkage of cement paste is very important for a better understanding of that of mortar and concrete Another limitation of the existing studies is that most of them are only about one type of supplementary material and the water–binder ratio of mixtures concerned in different studies always varies [12,13,14,15,16,17,18,19,20]. In order to better study the effect of different supplementary materials on the autogenous shrinkage of cement paste, which is useful for the better prediction of autogenous shrinkage of high-performance concrete that always contains supplementary materials, measurements of final setting time, internal relative humidity, chemical shrinkage, compressive strength and autogenous deformation of cement paste with various supplementary materials are presented and discussed in this paper. The results of this study contribute to a better understanding of the autogenous shrinkage of plain and blended cement pastes
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