乳酸钙掺量对基于微生物矿化沉积的混凝土裂缝自修复效果的影响
发布时间：2019-02-16 05:02
【摘要】：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;然而,如果混凝土中微生物矿化沉积过程中所必需的营养物质掺量不足,则可能限制其裂缝自修复效果的充分发挥。以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。主要考察乳酸钙掺量对基于科式芽孢杆菌矿化沉积的混凝土裂缝自修复效果的影响。试验结果表明,经过修复养护28 d后,研制的自修复混凝土表现出优越的裂缝自修复能力,最大修复裂缝宽度达到0.67 mm,为普通混凝土最大裂缝修复宽度的2.23倍;并且乳酸钙掺量对混凝土裂缝自修复效果影响较大,随着乳酸钙掺量的增加,混凝土的裂缝自修复能力显现出先上升后趋于平稳的趋势,当乳酸钙掺量为胶凝材料质量分数的1.75%时,混凝土的裂缝最大修复宽度达到最大。
[Abstract]:Self-repairing technology based on microbial mineralization deposition can effectively realize self-diagnosis and self-repair of concrete cracks. However, if the amount of nutrients necessary in the process of microbial mineralization in concrete is insufficient, the self-repairing effect of cracks may be restricted. A new type of crack self-repairing concrete was developed with Bacillus spp as self-repairing agent and expanded perlite as the carrier. The effect of calcium lactate content on self-repairing of concrete cracks based on the mineralized deposit of Bacillus sp. The experimental results show that after 28 days of repair and maintenance, the developed self-repairing concrete has excellent self-repairing ability, and the maximum crack width of 0.67 mm, is 2.23 times of that of ordinary concrete. With the increase of calcium lactate content, the self-repairing ability of concrete cracks increased first and then tended to steady. When the content of calcium lactate is 1.75% of the mass fraction of the cementing material, the maximum crack repair width of the concrete reaches the maximum.
【作者单位】： 太原理工大学建筑与土木工程学院;
【基金】：国家自然科学基金青年基金(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)资助
【分类号】：TU528
本文编号：2424074
[Abstract]:Self-repairing technology based on microbial mineralization deposition can effectively realize self-diagnosis and self-repair of concrete cracks. However, if the amount of nutrients necessary in the process of microbial mineralization in concrete is insufficient, the self-repairing effect of cracks may be restricted. A new type of crack self-repairing concrete was developed with Bacillus spp as self-repairing agent and expanded perlite as the carrier. The effect of calcium lactate content on self-repairing of concrete cracks based on the mineralized deposit of Bacillus sp. The experimental results show that after 28 days of repair and maintenance, the developed self-repairing concrete has excellent self-repairing ability, and the maximum crack width of 0.67 mm, is 2.23 times of that of ordinary concrete. With the increase of calcium lactate content, the self-repairing ability of concrete cracks increased first and then tended to steady. When the content of calcium lactate is 1.75% of the mass fraction of the cementing material, the maximum crack repair width of the concrete reaches the maximum.
【作者单位】： 太原理工大学建筑与土木工程学院;
【基金】：国家自然科学基金青年基金(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)资助
【分类号】：TU528
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1 常莉;谢丹兴;;混凝土微裂纹自修复能力试验设计[J];河南建材;2013年06期
2 常莉;谢丹兴;;混凝土微裂纹自修复能力试验设计[J];江西建材;2013年05期
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