煤矸石粉混凝土冻融损伤模型与劣化机制

doi:10.11896/cldb.22080144

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Abstract To promote the utilization of coal gangue in concrete in cold regions, this work studied the freeze-thaw damage law of mechanically-microwave activated coal gangue powder concrete (CGPC) with different substitution rates under freeze-thaw cycles. The damage layer thickness was corrected for ultrasonic wave velocity loss, and a freeze-thaw damage equation based on the modified damage layer thickness was established. The pore structure parameters, micro morphology, and hydration products of CGPC under freeze-thaw were tested and analyzed. The results show that 10% and 20% of activated coal gangue powder (ACGP) can improve the mechanical properties and frost resistance of concrete, when the content reaches 30%, the improvement effect of frost resistance is obviously weakened, and the mechanical properties are somewhat reduced. After freezing and thawing for 300 times, the compressive strength of 20% and 0% content group decreased by 16.4% and 26.5% respectively, the mass loss was 1.77% and 4.03% respectively, the relative dynamic elastic modulus was 68.940% and 91.321% respectively, and the thickness of damaged layer reached 11.9 mm and 17.4 mm respectively. The thickness of damaged layer modified based on ultrasonic velocity difference can more accurately represent the damage degree of CGPC. The particle filling effect and secondary hydration of ACGP improve the strength and frost resistance of CGPC.

Key words： concrete coal gangue admixture freeze thaw damage damage mechanism damage model

Published: 25 August 2024 Online: 2024-09-10

CLC number:

TU528.01

Fund:National Natural Science Foundation of China(51808443), Natural Science Basic Research Program of Shaanxi (2023-JC-YB-225).

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	Articles by authors
	GUAN Xiao
	LONG Hang
	DING Sha
	ZHANG Pengxin

Cite this article:

GUAN Xiao,LONG Hang,DING Sha, et al. Freeze-thaw Damage Model and Deterioration Mechanism of Coal Gangue Powder Concrete[J]. Materials Reports, 2024, 38(16): 22080144-9.

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http://www.mater-rep.com/EN/10.11896/cldb.22080144 OR http://www.mater-rep.com/EN/Y2024/V38/I16/22080144

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