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增强再生骨料固载混菌的混凝土裂缝自修复性能

花素珍 张家广 高沛 范月东 周爱娟

花素珍, 张家广, 高沛, 等. 增强再生骨料固载混菌的混凝土裂缝自修复性能[J]. 复合材料学报, 2023, 40(11): 6299-6310. doi: 10.13801/j.cnki.fhclxb.20230222.006
引用本文: 花素珍, 张家广, 高沛, 等. 增强再生骨料固载混菌的混凝土裂缝自修复性能[J]. 复合材料学报, 2023, 40(11): 6299-6310. doi: 10.13801/j.cnki.fhclxb.20230222.006
HUA Suzhen, ZHANG Jiaguang, GAO Pei, et al. Self-healing of concrete cracks by immobilizing non-axenic bacteria with enhanced recycled aggregates[J]. Acta Materiae Compositae Sinica, 2023, 40(11): 6299-6310. doi: 10.13801/j.cnki.fhclxb.20230222.006
Citation: HUA Suzhen, ZHANG Jiaguang, GAO Pei, et al. Self-healing of concrete cracks by immobilizing non-axenic bacteria with enhanced recycled aggregates[J]. Acta Materiae Compositae Sinica, 2023, 40(11): 6299-6310. doi: 10.13801/j.cnki.fhclxb.20230222.006

增强再生骨料固载混菌的混凝土裂缝自修复性能

doi: 10.13801/j.cnki.fhclxb.20230222.006
基金项目: 山西省高等学校科技成果转化培育项目(2020CG023);山西省应用基础研究计划面上青年项目(201901D211087)
详细信息
    通讯作者:

    张家广,博士,副教授,研究方向为微生物自修复混凝土 E-mail: zhangjiaguang@tyut.edu.cn

  • 中图分类号: TU528;TB332

Self-healing of concrete cracks by immobilizing non-axenic bacteria with enhanced recycled aggregates

Funds: Transformation of Scientific and Technological Achievements Programs of Higher Education Institutions in Shanxi (2020CG023); Scientific and Technological Project of Shanxi Province (201901D211087)
  • 摘要: 为解决当前微生物载体与混凝土基体兼容性差和费用高等问题,提出了一种基于增强再生骨料固载混菌的裂缝自修复混凝土。首先明确再生骨料合理矿化增强时间及其对混凝土抗压强度的影响,然后考察基于增强再生骨料固载混菌的混凝土裂缝自修复效果及其裂缝填充物成分。试验结果表明:混菌矿化增强再生骨料的合理时间为7天,增强处理后再生粗骨料吸水率和压碎指标降低幅度分别达到27%和20%,混凝土抗压强度提高幅度达到12.9%;裂缝修复平均宽度和裂缝完全修复率经28天修复养护后均达到0.28 mm和60%以上,最大修复裂缝宽度达到1.26 mm;渗水系数比未修复时降低了99.7%以上;裂缝部位沉淀晶体呈规则方块状,晶体类型为方解石。

     

  • 图  1  基于增强再生骨料(RA)固载微生物的混凝土裂缝自修复原理

    Figure  1.  Crack self-healing mechanism of concrete incorporating bacteria into recycled aggregate (RA) with enhancement

    图  2  裂缝初始宽度

    Figure  2.  Initial crack width

    图  3  增强RA吸水率与压碎指标

    Figure  3.  Water absorption and crushing index of enhanced RA

    图  4  混凝土坍落度与抗压强度

    Figure  4.  Slump and compressive strength of concrete

    图  5  混凝土裂缝修复过程表观图

    Figure  5.  Microscopic images of crack-healing processes of concrete specimens

    图  6  不同修复时间下混凝土裂缝自修复效果

    HP—Healing percentage of healed crack width; Dt—Average value of healed crack width; HPc—Completely healing percentage of healed crack width

    Figure  6.  Self-healing capacity of concrete cracks at different healing time

    图  7  不同修复时间下混凝土渗水系数k

    Figure  7.  Permeability coefficients k of concrete at different healing time

    图  8  再生粗骨料(RCA)表面矿化沉淀的SEM图像

    NB—Non-axenic bacteria; AB—Axenic bacteria

    Figure  8.  SEM images of bio-deposition on the surface of recycled coarse aggregate (RCA)

    图  9  再生细骨料(RFA)表面矿化沉淀的SEM图像

    Figure  9.  SEM images of bio-deposition on the surface of recycled fine aggregate (RFA)

    图  10  不同矿化微生物在混凝土裂缝部位沉淀物的SEM图像

    Figure  10.  SEM images of crack-filling precipitations induced by different cultures

    图  11  不同微生物矿化沉淀物的XRD图谱

    Figure  11.  XRD patterns of precipitations induced by different cultures

    表  1  混凝土配合比(kg·m−3)

    Table  1.   Mixing proportion of concrete (kg·m−3)

    SpecimenNatural coarse aggregateRCAEnhanced RCAEnhanced RFASandCementWaterPlasticizerCalcium lactate
    NAC 1140 0 0 0 588 457 215 3.63 9.68
    RCA-U/SHC 0 1140 0 0 588 457 215 3.63 9.68
    RCA-N3/SHC 0 0 1140 0 588 457 215 3.63 9.68
    RCA-N7/SHC 0 0 1140 0 588 457 215 3.63 9.68
    RCA-FN7/SHC 0 0 1140 294 294 457 215 3.63 9.68
    RCA-A7/SHC 0 0 1140 0 588 457 215 3.63 9.68
    Notes: RCA—Recycled coarse aggregate; RFA—Recycled fine aggregate; NAC—Normal concrete prepared by natural coarse aggregates; SHC—Self-healing concrete; RCA-U—Non-enhanced RCA; RCA-N3 and RCA-N7—RCA enhanced by biodeposition of non-axenic bacteria for 3 days and 7 days, respectively; RCA-FN7—RCA and RFA enhanced by biodeposition of axenic bacteria for 7 days; RCA-A7—RCA enhanced by biodeposition of axenic bacteria for 7 days; The residual nutrient solution after bio-deposition treatments of SHC was directly used as mixing water to prepare RCA-N3/SHC、RCA-N7/SHC、RCA-FN7/SHC and RCA-A7/SHC specimens.
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  • 收稿日期:  2022-12-15
  • 修回日期:  2023-01-19
  • 录用日期:  2023-01-29
  • 网络出版日期:  2023-02-22
  • 刊出日期:  2023-11-01

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