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硅酸盐通报 ›› 2026, Vol. 45 ›› Issue (8): 2944-2955.DOI: 10.16552/j.cnki.issn1001-1625.2026.0165

• 道路材料 • 上一篇    下一篇

微生物强化再生透水混凝土渗透及径流净化性能试验研究

陈民利1(), 覃潇2(), 辛向裕2, 张浩林2, 林永康3   

  1. 1.佛山市城市规划设计研究院有限公司,佛山 528000
    2.佛山大学土木与交通学院,佛山 528225
    3.佛交科天诺(广东)材料有限公司,佛山 528225
  • 收稿日期:2026-02-20 修订日期:2026-04-06 出版日期:2026-08-15 发布日期:2026-09-01
  • 通信作者: 覃潇,博士,副教授。E-mail:qinnao@fosu.edu.cn
  • 作者简介:陈民利(1978—),女,高级工程师。主要从事给排水设计与海绵城市的研究。E-mail:417838968@qq.com
  • 基金资助:
    广东省基础与应用基础研究基金青年提升项目(2024A1515030113);佛山市自筹经费类科技创新项目(2520001003028);广东省普通高校自然科学类重点领域项目(2025ZDZX4057);国家自然科学基金青年项目(51908130)

Experimental Study on Permeability and Runoff Purification Performance of Microbial Enhanced Recycled Pervious Concrete

CHEN Minli1(), QIN Xiao2(), XIN Xiangyu2, ZHANG Haolin2, LIN Yongkang3   

  1. 1.Foshan Urban Planning and Design Research Institute Co. ,Ltd. ,Foshan 528000,China
    2.School of Civil Engineering and Transportation,Foshan University,Foshan 528225,China
    3.Fojiaoke Tiannuo (Guangdong) Materials Co. ,Ltd. ,Foshan 528225,China
  • Received:2026-02-20 Revised:2026-04-06 Published:2026-08-15 Online:2026-09-01

摘要:

采用微生物诱导碳酸盐沉淀(MICP)技术修复再生骨料用于透水混凝土路面,可有效避免物理或化学修复造成的骨料损伤、环境污染等问题。本文研究了再生骨料掺量和设计孔隙率对再生透水混凝土透水性能及孔隙特性的影响规律;通过径流污染物动态吸附试验,深入探索了骨料修复前、后透水混凝土对径流重金属污染物净化效能的周期性演变特征;借助扫描电子显微镜联合能量色散谱(SEM-EDS)进一步分析了混凝土孔壁表面残留元素的分布特征与相对含量,并从微观层面揭示了净化机理,进而实现了有效工程应用。结果表明:随着再生骨料掺量的增大,强化后混凝土的透水系数和连通孔隙率与强化前的差值均增加,当掺量为50%(体积分数)时,透水系数和连通孔隙率相比强化前分别降低了31.51%和15.15%,归因于生物CaCO3对骨料缺陷的填充作用;生物CaCO3将透水混凝土对Zn2+、Cr3+、Pb2+的初始净化率提升至35%~80%,对Zn2+的吸附效果最佳,其次是Cr3+和Pb2+;骨料表面的生物CaCO3能够与径流中的重金属离子发生离子交换和表面化学络合,显著提升重金属元素在混凝土孔壁表面的残留量,并呈现局部富集特征,具备优良的净化效能。

关键词: 微生物矿化, 再生透水混凝土, 透水性能, 径流污染, 重金属离子, 净化机理

Abstract:

Using microbial-induced carbonate precipitation (MICP) technology to repair recycled aggregate for pervious concrete pavement can effectively avoid aggregate damage and environmental pollution caused by physical or chemical repair. In this paper, the influences of recycled aggregate content and design porosity on the permeability and pore characteristics of recycled pervious concrete were studied. Through the dynamic adsorption test of runoff pollutants, the periodic evolution characteristics of the purification efficiency of pervious concrete on heavy metal pollutants in runoff before and after aggregate repair were deeply explored. With the help of scanning electron microscopy combined with energy dispersive spectroscopy (SEM-EDS), the distribution characteristics and relative content of residual elements on the surface of concrete pore wall were further analyzed, and the purification mechanism was revealed from the micro level, so as to realize effective engineering application. The results show that with the increase of recycled aggregate content, the permeability coefficient and connected porosity difference between concrete after strengthening and before strengthening increases. When the content is 50% (volume fraction), the permeability coefficient and the connected porosity are reduced by 31.51% and 15.15% respectively compared with those before strengthening, which is attributed to the filling effect of biological CaCO3 on aggregate defects. The initial purification rate of Zn2+, Cr3+ and Pb2+ by pervious concrete is increased to 35% to 80% by biological CaCO3, and the adsorption effect of Zn2+ is the best, followed by Cr3+ and Pb2+. The biological CaCO3 on the aggregate surface can undergo ion exchange and surface chemical complexation with heavy metal ions in the runoff, significantly increasing the residual amount of heavy metal elements on the surface of the concrete pore wall, and showing local enrichment characteristics, with excellent purification efficiency.

Key words: microbial mineralization, recycled pervious concrete, water permeability, runoff pollution, heavy metal ion, purification mechanism

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