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Abstract
In this study, the prism method was used to test the autogenous shrinkage of cement paste, mortar, and gravel concrete (cement paste with gravel) in order to analyze the effect of aggregate on autogenous shrinkage. A concise shrinkage model considering the aggregate volume fraction and the average size of aggregate is proposed. The results of the prism method show that the autogenous shrinkage of paste with a high w/c ratio and large volume fraction of aggregate is small. Under the same w/c ratio, the autogenous shrinkage ratios of mortar or concrete to pure cement paste tend to be constants, which do not vary with time. To determine the specific effect of the aggregate on shrinkage, the finite element method is used to calculate the autogenous shrinkage of pure cement paste and mortar. The simulation results show that high aggregate content and smaller particle size are beneficial in decreasing the autogenous shrinkage of mortar and concrete. A power function model considering the volume fraction and the average size of aggregate is developed to describe the effect of aggregate on the paste’s shrinkage based on the experimental and simulation results. The one of application of the model is that the shrinkage of mortar and concrete can be calculated by the shrinkage of the pure cement paste, the volume fraction, and the average particle size of the aggregate.
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