This paper studied the synergistic effect of high modulus heat shrinkable fibers and internal curing aggregates with highly micro connected pores on the mechanical properties,crack resistance and shrinkage properties of large-volume concrete,and the microscopic mechanism analysis was carried out.The results show that the remixing of heat shrinkable fiber and internal curing aggregate has little effect on compressive strength,but it will improve the crack resistance performance of large-volume concrete and reduce reduce shrinkage deformation.The maximum crack width and total crack area per unit area decreased by 85.7％and 94.9％respectively compared to the benchmark group,and the drying shrinkage value decreased by 47.6％.SEM tests show that the heat shrinkable fiber and the inner curing aggregate are tightly combined with the cement paste and the interface is dense,thereby improving the crack resistance of large-volume concrete.
维普
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