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薛   刚

 

( 四川工业科技学院 , 德阳    618500)

摘  要: 针对透水混凝土力学性能和抗冻性能较差的问题 , 采用粉煤灰部分替代水泥 , 并掺入聚丙烯纤维对透水混凝土进行改性 。制备了一系列掺粉煤灰 、聚丙烯纤维的透水混凝土试件 , 系统分析了透水性能 、力学强度 、耐磨性能 、抗冻性能的演变规律 。结果表明 : 粉煤灰掺量为 10%时透水性能最佳 , 随聚丙烯纤维掺量增加 , 连通孔隙率减小 、透水系数先增后减 , 透水性能随纤维长度增加而降低 ; 随粉煤灰掺量增加 , 90 d 抗压、抗折强度先增后减 , 掺量为 15%时最优 , 抗压强度增幅高于抗折强度 ; 聚丙烯纤维长度为 16 mm, 掺量为 7 kg/m3时力学强度、耐磨性能 、抗冻性能最佳 。研究成果可为透水混凝土工程应用提供参考依据。

关键词: 聚丙烯纤维 ; 粉煤灰 ; 透水混凝土 ; 改性机理

中图分类号: TU528, U414      文献标志码: A      文章编号: 1005-8249 (2026) 04-0037-07

DOI:10. 19860/j. cnki. issn1005-8249. 2026. 04. 006

 

Analysis on Mechanical and Frost Resistance Properties of Pervious

Concrete Mixed with Polypropylene Fiber and Fly Ash

XUE Gang

(Sichuan Institute of Industrial Technology, Deyang 618500, China)

Abstract : To address the issues of poor mechanical properties and freeze-thaw resistance of pervious concrete, fly ash was used as a partial replacement for cement, and polypropylene fibers were incorporated to modify the pervious concrete.  A series of pervious concrete specimens with fly ash and polypropylene fibers were prepared, and the evolution of water permeability, mechanical strength, abrasion resistance, and freeze-thaw resistance was systematically analyzed. The results indicate that the optimal water permeability is achieved when the fly ash content is 15%.  As the polypropylene fiber content increases, the connected porosity decreases, while the permeability coefficient first increases and then decreases.  The water permeability decreases with increasing fiber length. With the increase in fly ash content, both the 90-day compressive strength and flexural strength first increase and then decrease, reaching their optimum at a fly ash content of 15% , with a greater increase in compressive strength than in flexural strength. The optimal mechanical strength, abrasion resistance, and freeze-thaw resistance are achieved with polypropylene fibers of 16 mm in length and a content of 7 kg/m3 .  The research findings can provide a reference for the engineering application of pervious concrete.

Key words: polypropylene fiber; fly ash; pervious concrete; modification mechanism