混凝土 2026年 第卷 第04期

DOI: 10.7672 / sgjs2026040014

聚乙烯醇和玄武岩混掺纤维增强再生骨料透水混凝土性能研究

杜腾飞¹,折帅¹,王吉鹏¹,寇威¹,陈潇龙¹,张轩宁²

作者单位:

1.中铁七局集团西安铁路工程有限公司,陕西西安 710032;2.西安建筑科技大学土木工程学院,陕西西安 710055

基金项目:

∗陕西省重点研发计划(2020SF⁃373)

摘要:

针对再生骨料透水混凝土强度不足的问题,通过混掺聚乙烯醇纤维(PVA)和玄武岩纤维(BF)进行性能优化。采用不同掺量的双纤维混掺方案,结合 XRD 和 SEM 微观分析及物理力学性能测试,系统探究纤维对再生骨料透水混凝土的增强机理与综合性能影响。结果表明:纤维混掺可消耗水泥水化产物 Ca(OH)2 ,优化微观结构密实度,抗压强度提升幅度显著高于抗折强度;透水系数与孔隙率随纤维掺量增加呈规律性递减,但仍满足透水材料的基本要求。通过灰色关联理论与熵权法综合评价发现,当 PVA 和 BF 各掺入 0.1%时,再生骨料透水混凝土的综合性能最优,此时 28d 抗压强度达 24.5MPa,透水系数维持 2.1mm/ s,可实现力学性能与透水功能的协同提升。

English:

This paper addresses the issue of insufficient strength in pervious concrete made with recycledaggregate by optimizing its performance through the combined incorporation of polyvinyl alcohol (PVA)fibers and basalt fibers. A dual⁃fiber mixing scheme with varying dosages was adopted, and theenhancement mechanism and comprehensive performance effects were systematically investigated using X⁃ray diffraction (XRD), scanning electron microscopy(SEM), and physical⁃mechanical property tests.The results indicate that fiber incorporation consumes cement hydration products, particularly Ca(OH)2 ,and improves the compactness of the microstructure. The increase in compressive strength wassignificantly higher than that of flexural strength. The permeability coefficient and porosity exhibited aregular decreasing trend with increasing fiber content,while still meeting the basic requirements ofpervious materials. A comprehensive evaluation based on grey correlation theory and the entropyweightmethod revealed that the optimal performance was achieved when both PVA and basalt fibers wereincorporated at 0. 1%,yielding an evaluation index of 93.9%. At this dosage, the 28⁃day compressivestrength reached 24.5MPa, and the permeability coefficient remained at 2.1mm / s, achieving asynergistic enhancement of mechanical properties and permeability performance.