Uniaxial Dynamic Tensile Properties of Hydraulic Concrete after Freezing-Thawing Cycles

Abstract

In this paper, freeze-thaw cycles tests of 0, 25, 50, 75 and 100 times for large aggregate concrete were carried out and uniaxial dynamic tensile tests under the strain rates of 10-5/s, 10-4/s, 10-3/s and 10-2/s were also performed. The damage morphology of the specimens after freezing-thawing cycles was observed, the mass loss after different freezing-thawing cycles, the dynamic ultimate tensile strength, peak strain and the relationship of stress-strain under different strain rates were measured. The results showed that relation curve between the mass loss of large aggregate concrete and the freezing-thawing cycles was quadratic. Under the same strain rate, the dynamic ultimate tensile strength and the peak strain decreased with
the increase of freezing-thawing cycles. With the same freezing-thawing cycles and the increase of strain rate, the dynamic ultimate tensile strength increased, while the peak strain decreased. According to the test date, the incremental portion of stress-strain curve was fitted and the failure criterion of large aggregate concrete under dynamic uniaxial tensile stress was established, which could provide the theoretical reference for the design and maintenance of large aggregate structures.