Damage Model of Desert Sand Fiber Reinforced Concrete under Freeze-Thaw Cycles

Abstract

Abstract: In order to study the damage model of desert sand fiber reinforced concrete under freeze-thaw cycles, the rapid freeze-thaw tests of 0 times, 25 times, 50 times, 75 times, 100 times, 125 times and 150 times were carried out on desert sand fiber concrete. The attenuation law of relative dynamic elastic modulus, compressive strength and splitting tensile strength of desert sand fiber concrete after different freeze-thaw cycles were analyzed. Combined with test data, the freeze-thaw damage deterioration model of desert sand fiber concrete was established based on exponential function and quadratic function. The results show that compared with desert sand concrete, the freeze-thaw resistance of desert sand concrete with polypropylene fiber is effectively improved. With the increase of freeze-thaw cycles, the relative dynamic elastic modulus decreases continuously. After 150 freeze-thaw cycles, the compressive strength and splitting tensile strength of desert sand fiber concrete decrease by 49.5% and 70.13% respectively compared with 0 times freeze-thaw cycle. Two damage models of desert sand fiber concrete under freeze-thaw environment are established, and the calculated values are in good agreement with experimental values, which can provide a theoretical reference for the application of desert sand fiber concrete in severe cold areas.

Key words: desert sand, fiber reinforced concrete, dynamic modulus of elasticity, damage amount, freeze-thaw damage model

CLC Number:

TU528

ZHANG Guangtai, GENG Tianjiao, LU Haibo, WANG Mingyang, LI Xuefan. Damage Model of Desert Sand Fiber Reinforced Concrete under Freeze-Thaw Cycles[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(7): 2225-2231.

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