玄武岩-聚丙烯纤维增强混凝土在杂散电流与硫酸盐作用下的劣化规律

doi:10.11896/cldb.24040090

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Abstract In order to investigate the impact of stray currents and sulfate on the durability of hybrid fiber concrete, researchers conducted tests on the compressive strength, relative dynamic elastic modulus, and damage layer thickness of basalt/polypropylene fiber-reinforced concrete. These tests aimed to elucidate the damage mechanism and deterioration pattern under the influence of stray currents and sulfate. The micro-morphology and physical composition of hybrid fiber concrete after stray currents and sulfate interaction were also analyzed. The results revealed that:(ⅰ) Stray currents accelerate sulfate ion erosion, leading to ion aggregation, gel material destruction, and crack generation in the weak areas of concrete, thus significantly reducing the relative dynamic elastic modulus.(ⅱ) At the same erosion age, the compressive strengths of NC-30, BC-30-0.1, PC-30-0.1, BPC-30-0.1, and BPC-30-0.2 were reduced by 43.4%, 34.2%, 39.1%, 26.2%, and 49.7%, respectively.(ⅲ) Under the same number of erosion days, compared with NC-30, the thickness of the damage layer for BPC-30-0.2, PC-30-0.1, BC-30-0.1, and BPC-30-0.1 decreased by -4.4%, 1.4%, 5.4%, and 10.4%, respectively. Furthermore, a predictive model for the damage layer thickness of hybrid fiber-reinforced concrete considering factors such as fibers and stray current density under the combined action of stray current and sulfate was established.(ⅳ) With the migration of OH^- transported by stray currents, the internal pH of the concrete decreased, and the content of Ca(OH)₂ reduced. This was evidenced by a decrease in the peak spectra of TSA diffraction and the occurrence of TSA decomposition reactions.

Key words： hybrid fiber stray current sulfate erosion damage mechanism deterioration behavior

Published: 25 September 2025 Online: 2025-09-11

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TU528

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	Articles by authors
	WEN Bo
	TIAN Wei
	ZHANG Lu
	NIU Ditao
	JI Zhiyuan

Cite this article:

WEN Bo,TIAN Wei,ZHANG Lu, et al. Deterioration Pattern of Basalt-Polypropylene Fiber Reinforced Concrete Under Stray Currents and Sulfate Action[J]. Materials Reports, 2025, 39(18): 24040090-7.

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https://www.mater-rep.com/EN/10.11896/cldb.24040090 OR https://www.mater-rep.com/EN/Y2025/V39/I18/24040090

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