钢纤维地聚物再生混凝土力学性能及强度指标换算

doi:10.11896/cldb.24100219

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Abstract A total of 240 steel fiber geopolymeric recycled concrete (SFGRC) specimens were prepared, with recycled coarse aggregate replacement ratio (0%—100%) and steel fiber volume fraction (0%—1.5%) as the primary variables, and these specimens were tested for basic mechanical properties and observed for microstructural morphology. The results indicated that replacing natural aggregate with recycled coarse aggregate reduced all fundamental mechanical properties of the concrete. For SFGRC specimen with a 100% recycled aggregate replacement and 1.0% steel fiber content, its cube compressive strength, axial compressive strength, elastic modulus, splitting tensile strength, and flexural strength decreased by 15%, 9%, 25%, 15%, and 15%, respectively, while its peak strain increased by 24%. Except for elastic modulus, incorporating steel fibers significantly improved the mechanical properties of the concrete, and its failure exhibited a ductile mode. When the recycled aggregate replacement ratio reached 100% with 1.5% steel fiber content, the cube and axial compressive strength, peak strain, splitting tensile strength, and flexural strength of the specimen increased by 15%, 9%, 10%, 65%, and 39%, respectively. Based on experimental results, a series of calculation formula and conversion relationship for the fundamental strength indices of SFGRC were proposed, accounting for the effects of recycled aggregate replacement and steel fiber content.

Key words： geopolymeric concrete steel fiber recycled aggregate mechanical property strength index empirical formula

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

CLC number:

TU528

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	Articles by authors
	DONG Shuo
	ZHENG Lisen
	SHI Fengwei
	WANG Lai
	LIU Zhe

Cite this article:

DONG Shuo,ZHENG Lisen,SHI Fengwei, et al. Mechanical Properties and Strength Index Conversion of Steel Fiber Geopolymeric Recycled Concrete[J]. Materials Reports, 2025, 39(7): 24100219-8.

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https://www.mater-rep.com/EN/10.11896/cldb.24100219 OR https://www.mater-rep.com/EN/Y2025/V39/I7/24100219

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