纤维-地聚物混凝土力学性能及耐久性能研究

摘要/Abstract

摘要： 为改善地聚物混凝土的力学性能和耐久性,通过掺入不同长度和掺量的聚丙烯纤维,对地聚物混凝土的力学性能、抗冻性、抗氯离子侵蚀性及抗裂性进行了研究,并基于SEM试验,从微观角度进一步解释聚丙烯纤维的作用机理.结果表明:聚丙烯纤维的掺入能够提高地聚物混凝土的力学性能和耐久性能,当纤维掺量为0%~0.6%时,随着纤维掺量的增加,地聚物混凝土的改善效果越明显.当掺量超过0.6%时,其力学性能和耐久性开始下降.通过SEM分析也表明,聚丙烯纤维能够提高基体内部的整体性和密实性,从而显著改善地聚物混凝土的力学性能和耐久性.最终推荐掺量0.6%长度为12 mm的聚丙烯纤维为最佳掺量.

关键词: 聚丙烯纤维, 地聚物混凝土, 力学性能, 抗冻性能, 抗氯离子侵蚀性

Abstract: In order to improve the mechanical properties and durability of geopolymer concrete, experimental studies were conducted on the effects of incorporating polypropylene fibers of varying lengths and dosages on the mechanical properties, frost resistance, chloride ion corrosion resistance, and crack resistance of geopolymer concrete. Furthermore, based on SEM experiments, the mechanism of action of polypropylene fibers was further elucidated from a microscopic perspective. The research results indicated that the addition of polypropylene fibers can improve both the mechanical properties and durability of geopolymer concrete. Specifically, when the fiber content is 0%-0.6%, the improvement effect of geopolymer concrete becomes more pronounced with the increase of fiber content. However, when the dosage exceeds 0.6%, both the mechanical properties and durability begin to decline. SEM analysis further indicated that polypropylene fibers can improve the integrity and compactness of the matrix, thereby significantly improving the mechanical properties and durability of geopolymer concrete. Ultimately, the optimal dosage of polypropylene fibers is recommended to be 0.6% with a length of 12 mm.

Key words: polypropylene fiber, geopolymer concrete, mechanical properties, frost resistance, resistance to chloride ion corrosion

中图分类号:

TB33

公晋芳, 任永祥. 纤维-地聚物混凝土力学性能及耐久性能研究[J]. 兰州理工大学学报, 2024, 50(2): 24-30.

GONG Jin-fang, REN Yong-xiang. Study on mechanical properties and durability of fiber-geopolymer concrete[J]. Journal of Lanzhou University of Technology, 2024, 50(2): 24-30.

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