基于科式芽孢杆菌矿化沉积的混凝土裂缝自修复性能试验研究

发布时间：2018-06-06 04:49

本文选题：混凝土 + 裂缝自修复　；参考：《混凝土》2017年06期

【摘要】：混凝土材料具有脆性大、抗拉强度较低等特点,导致其内部或表面难以避免出现微裂缝。基于微生物矿化沉积的裂缝自修复技术能够有效地实现混凝土裂缝的自诊断和自修复。以具有嗜碱特性的科式芽孢杆菌为自修复剂,以膨胀珍珠岩为修复剂载体,研制出一种新型裂缝自修复混凝土。分别对普通混凝土、采用直接掺菌的混凝土和研制的自修复混凝土的裂缝自修复能力进行试验研究。试验结果表明,在裂缝修复早期,裂缝内表面未水化胶凝材料的水化反应致使裂缝宽度小于0.2 mm的普通混凝土试件具有较好的自修复能力;随着裂缝修复时间的增长,基于科式芽孢杆菌矿化沉积的混凝土试件具有更优异的自修复能力,水中养护28 d后研制的自修复混凝土最大修复裂缝宽度可达0.56 mm。研究结果可为混凝土裂缝自修复技术研究提供技术支持和依据。
[Abstract]:Because of its high brittleness and low tensile strength, it is difficult to avoid microcracks on the inner or surface of concrete. Self-repairing of cracks based on microbial mineralization deposition can effectively realize self-diagnosis and self-repair of concrete cracks. A new type of crack self-repairing concrete was developed with the alkalophilic Bacillus family as self-repairable agent and expanded perlite as the carrier. The crack self-repairing ability of common concrete and self-repairing concrete was studied by using directly mixed concrete and self-repairing concrete. The results show that in the early stage of crack repair, the hydration reaction of unhydrated cementing material on the inner surface of the crack results in the self-repairing ability of the ordinary concrete specimen whose crack width is less than 0.2 mm, and with the increase of the crack repair time, The concrete specimens deposited by Bacillus subtilis mineralization have better self-repairing ability. The maximum repair crack width of self-repairing concrete developed after 28 days of water curing can reach 0.56 mm. The results can provide technical support and basis for the study of concrete crack self-repairing technology.
【作者单位】：太原理工大学建筑与土木工程学院;太原理工大学环境工程学院;
【基金】：国家自然科学基金青年项目(51508370) 中国博士后科学基金面上项目(2016M591416) 山西省科技攻关项目(20150313014-1)
【分类号】：TU528

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