Deterioration Pattern of Basalt-Polypropylene Fiber Reinforced Concrete Under Stray Currents and Sulfate Action
WEN Bo1,2,*, TIAN Wei1,2, ZHANG Lu3, NIU Ditao1,2, JI Zhiyuan1,2
1 School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China 2 State Key Laboratory of Green Building, Xi'an 710055, China 3 College of Materials Science and Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
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.
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2025, Vol. 39 
