硫酸盐冻融后沙漠砂混凝土单轴受压力学性能试验研究

doi:10.11896/cldb.23110222

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Abstract In order to investigate the frost resistance and mechanical properties deteriorationlaw of desert sand concrete (DSC) under sulfate freeze-thaw environment, the uniaxial compression tests of concrete were carried out with desert sand replacement rate (DSRR, 0%, 20%, and 40%), sulfate solution mass fractions (3%, 5%, and 7%), and the number of freeze-thaw cycles (0, 25, 50, 75, 100, and 125) as test variables. The variation laws of mass, dynamic elastic modulus, axial compressive strength, peak strain, elastic modulus, and damage of DSC were analyzed. The deterioration mechanism of DSC under sulfate freeze-thaw environment was further investigated by combining X-ray diffraction (XRD) and scanning electron microscope (SEM) tests. The test results showed that the damage of concrete after salt freezing cycles was small at early stage of freeze-thaw cycle, and then the performance deterioration of DSC increased with the increase of the number of freeze-thaw cycles. The mass, dynamic elastic modulus, compressive strength and elastic modulus of DSC after freeze-thawing decreases the most when the mass fraction of the sodium sulfate solution was equal to 7%. The frost resistance of concrete in sulfate freeze-thaw environments gradually increased as the DSRR increase from 0% to 40%. The constitutive relationship of DSC in a sulfate freeze-thaw environment was established based on the Lemaitre assumption of strain equivalence and continuum damage theory.

Key words： desert sand concrete (DSC) sulfate freeze-thaw stress-strain curve Weibull distribution damage constitutive relationship microstructure

Published: 10 April 2025 Online: 2025-04-10

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TU528

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	Articles by authors
	JIANG Yanjie
	LIU Haotian
	LIU Haifeng
	CHE Jialing
	YANG Weiwu

Cite this article:

JIANG Yanjie,LIU Haotian,LIU Haifeng, et al. Experimental Study on the Uniaxial Compressive Mechanical Properties of Desert Sand Concrete After Sulfate Freeze-thawing[J]. Materials Reports, 2025, 39(7): 23110222-11.

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https://www.mater-rep.com/EN/10.11896/cldb.23110222 OR https://www.mater-rep.com/EN/Y2025/V39/I7/23110222

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