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产脲酶微生物催化尿素水解,在有钙源的情况下生成碳酸钙晶体,称之为微生物诱导碳酸钙沉积技术(MICP)。MICP技术应用于土木工程是目前学术界的一个研究热点。针对济南某小区地下车库钢筋混凝土外墙渗漏水的情况,应用MICP技术,采取在裂缝墙体迎水面回填土层灌注巴氏芽孢八叠球菌菌液和营养液的方法进行渗漏治理试验。试验结束后进行的注水试验、墙体超声波检测、回填土层地质雷达检测、混凝土取芯观察、裂缝封堵物质的X射线衍射、电镜扫描分析等表明:灌浆4个月后,背水面墙体裂缝处形成一层碳酸钙膜,将裂缝表面覆盖,在降雨时该裂缝位置已无水渗出;迎水面土体变得更加均匀、紧密,延缓了雨水的渗入;墙体裂缝中有大量的碳酸钙生成,填充效果在墙体的较低位置更为明显。MICP技术为混凝土裂缝修复和地下结构渗漏治理提供了一个新的途径。
Urease-producing microorganisms catalyze the hydrolysis of urea, producing calcium carbonate crystals in the presence of a source of calcium called microbial-induced calcium carbonate deposition (MICP). MICP technology applied to civil engineering is currently a research hotspot in academia. Aiming at the leakage of reinforced concrete external wall in the underground garage of a district in Jinan, the leakage control test was carried out by using MICP technology to perfuse Bacillus pasteuriensis bacterial liquid and nutrient solution in the backfill soil facing the crack wall. Water injection test, wall ultrasonic testing, ground-based radar detection of backfill soil, observation of concrete core, X-ray diffraction of crack plugging material and scanning electron microscope showed that after 4 months of grouting, A layer of calcium carbonate film is formed at the crack and the surface of the crack is covered. During the rain, the location of the crack has no water exuding. The soil facing the water surface becomes more uniform and tight, which delays the infiltration of rainwater. Calcium carbonate generation, filling effect in the lower part of the wall more obvious. MICP technology provides a new way for concrete crack repair and underground structure leakage treatment.