陶粒轻骨料自修复混凝土的制备及其自修复性能研究-《混凝土与水泥制品》杂志社

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陶粒轻骨料自修复混凝土的制备及其自修复性能研究

Study on preparation and self-healing performance of self-healing concrete with ceramic particle lightweight aggregate

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关键词：

陶粒轻骨料；枯草芽孢杆菌；微生物矿化；自修复混凝土；力学性能；裂缝修复；微观分析

Key words：

刊期：

2025年第10期

DOI：

10.19761/j.1000-4637.2025.10.122.08

文章编号：

基金项目：

作者：

郭卓民，费爱萍*，张铁志

单位：

辽宁科技大学土木工程学院，辽宁鞍山 114051

摘要

摘要：研究了陶粒作为载体对微生物（枯草芽孢杆菌）活性与矿化能力的影响，探究了陶粒掺量（40%、45%、50%、55%、60%、65%）对混凝土力学性能及微生物浓度（2.15×10⁴、2.15×10⁵、2.15×10⁶、2.15×10⁷ mol/L）对自修复混凝土自修复性能的影响。结果表明：陶粒对微生物具有较好的保护作用，且对微生物的矿化能力影响较小；随着未固载微生物陶粒、固载微生物陶粒掺量的增加，混凝土的7 d、28 d抗压和抗折强度基本先增后降，当陶粒掺量均为45%时，混凝土的28 d力学性能最高；随着微生物浓度的增加，试件的抗压强度恢复率、裂缝完全愈合率、平均裂缝修复宽度、最大裂缝修复宽度基本先增后降，24 h吸水率先降后增；综合考虑自修复混凝土的力学性能及自修复效果，推荐陶粒的掺量为45%，微生物浓度为2.15×10⁵ mol/L。

Abstract: The effects of ceramic particle as the carrier on the activity and mineralization capacity of microbial (bacillus subtilis) were investigated. The influence of ceramic particle content (40%, 45%, 50%, 55%, 60%, 65%) on concrete mechanical properties and microbial concentrations (2.15×10⁴, 2.15×10⁵, 2.15×10⁶, 2.15×10⁷ mol/L) on the self-healing performance of self-healing concrete was studied. The results show that ceramic particle has a better protective effect on microbial and has a relatively minor impact on microbial mineralization capacity. As the content of ceramic particle without microbial immobilization and immobilized microbial ceramic particle increases, the 7 d and 28 d compressive and flexural strengths of concrete generally first increase and then decrease. When the ceramic particle content is 45%, the 28 d mechanical properties of concrete are highest. With the increase of microbial concentration, the compressive strength recovery rate, complete crack healing rate, average crack repair width and maximum crack repair width of the specimens generally first increase and then decrease, while the 24 h water absorption rate first decreases and then increases. Considering the mechanical properties and self-healing effects of the self-healing concrete comprehensively, the recommended content of ceramic particle is 45%, and the microbial concentration is 2.15×10⁵ mol/L.

结论

（1）在相同培养时间下，未经固载的微生物与载体内部的微生物活性水平接近，且相较于未经固载的微生物组，载体内部微生物矿化生成的CaCO₃量仅降低了4.8%，载体对微生物具有保护作用。
（2）固载微生物组试件的7 d、28 d抗压和抗折强度均高于未固载微生物组；随着未固载微生物陶粒、固载微生物陶粒掺量的增加，混凝土的7 d、28 d抗压和抗折强度基本呈先增后降的趋势，当固载微生物陶粒的掺量为45%时，混凝土的28 d抗压、抗折强度最高，分别为42.0 MPa和6.4 MPa。
（3）不同浓度的微生物对于宽度为0.1~0.5 mm的裂缝愈合效果较好，而对于宽度为0.5~0.7 mm的裂缝愈合效果相对较差。随着微生物浓度的增加，自修复混凝土试件的抗压强度恢复率、裂缝完全愈合率、平均裂缝修复宽度、最大裂缝修复宽度基本先增后降，24 h吸水率先降后增。当微生物浓度为2.15×10⁵ mol/L时，微生物的矿化效率相对最高，自修复混凝土的抗压强度恢复率为65.1%，24 h吸水率为0.95%，裂缝完全愈合率为81.8%，裂缝最大修复宽度为0.674 mm。
（4）综合考虑自修复混凝土的力学性能及自修复效果，本文推荐陶粒的掺量为45%，微生物浓度为2.15×10⁵ mol/L。

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引用本文

郭卓民,费爱萍,张铁志.陶粒轻骨料自修复混凝土的制备及其自修复性能研究[J].混凝土与水泥制品,2025(10):122-129

GUO Z M,FEI A P,ZHANG T Z.Study on preparation and self-healing performance of self-healing concrete with ceramic particle lightweight aggregate[J].China Concrete and Cement Products,2025(10):122-129.

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