乳酸钙掺量对微生物自修复混凝土裂缝修复宽度与抗压强度的影响

发布时间：2018-04-16 03:14

本文选题：混凝土 + 裂缝　；参考：《混凝土》2017年08期

【摘要】：基于微生物矿化沉积的混凝土裂缝自修复技术可以有效地对混凝土裂缝进行修复。营养物质作为微生物代谢反应过程中的底物,其掺量可能对自修复混凝土的裂缝自修复能力及基本力学性能产生较大的影响。课题组以科氏芽孢杆菌为裂缝自修复剂、以膨胀珍珠岩作为自修复剂的载体,以乳酸钙作为营养物质,研制出一种新型裂缝自修复混凝土,主要考察了乳酸钙掺量对该混凝土的裂缝自修复能力与抗压强度的影响。试验结果表明,研制的裂缝自修复混凝土表现出良好的裂缝自修复能力,28 d修复养护后的裂缝最大修复宽度可达0.67 mm;随着乳酸钙掺量的增加,混凝土抗压强度呈现出先上升后下降的趋势,当乳酸钙掺量为胶凝材料质量分数的1.05%时,相比未掺乳酸钙的对照组增加了16.3%。
[Abstract]:The self-repairing technique of concrete cracks based on microbial mineralization deposition can effectively repair concrete cracks.As a substrate in the process of microbial metabolic reaction, the amount of nutrients may have a great effect on the self-repairing ability and basic mechanical properties of self-repairing concrete.A new type of crack self-repairing concrete was developed by using Bacillus Corii as self-repairing agent, expanded perlite as self-repairing agent and calcium lactate as nutrient.The effect of calcium lactate content on the self-repairing ability and compressive strength of the concrete was investigated.The test results show that the crack self-repairing concrete developed has a good crack self-repairing ability and the maximum repair width of the crack after 28 days of repair and curing can reach 0.67 mm, and with the increase of calcium lactate content, the maximum repair width of the crack can reach 0.67 mm.The compressive strength of concrete increased first and then decreased. When the content of calcium lactate was 1.05wt% of the cementing material, the content of calcium lactate increased 16.3% compared with the control group without calcium lactate.
【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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