Deterioration Law of Recycled Concrete under the Coupling of Chloride and Freeze-Thaw

Abstract

Abstract: In order to study the damage and deterioration law of recycled concrete in severe cold and saline environment, the recycled coarse aggregate mass replacement rate of 0%, 50%, and 100% of recycled concrete were prepared to carry out the experimental study under the coupling of chloride and freeze-thaw. And its damage and deterioration law was discussed from the aspects of appearance, mass loss rate, relative dynamic elastic modulus and compressive strength. The results show that the damage to recycled aggregate concrete caused by chloride and freeze-thaw increases with the increase in the replacement rate of recycled aggregate.Compared with 200 freeze-thaw cycles and 0 freeze-thaw cycles, the mass loss rate, relative dynamic elastic modulus and relative compressive strength of the recycled concrete with 100% replacement rate decrease by 6.8%, 54.2% and 50.5%, respectively. The mass loss rate used to evaluate the durability of recycled concrete against salt and freezing has certain limitations. The loss rate of compressive strength is more suitable to characterize the degree of durability damage of recycled concrete than the relative dynamic modulus. A linear evolution model based on the loss of compressive strength as the damage variable is established. The model characterizes well the damage and deterioration of recycled concrete under the action of chloride and freeze-thaw, and provides a theoretical basis for the use of recycled concrete in severe cold and saline areas.

Key words: recycled concrete, coupling of chloride and freeze-thaw, deterioration law, compressive strength, evolution model

CLC Number:

TU528

XIE Guoliang, SHEN Xiangdong, LIU Jinyun, ZHANG Bin. Deterioration Law of Recycled Concrete under the Coupling of Chloride and Freeze-Thaw[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(2): 473-479.

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