裂缝尺寸对微生物修复混凝土强度的影响

为研究微生物在不同宽度、深度的裂缝尺寸下对混凝土强度的修复效果,选用巴氏芽孢杆菌为裂缝修复剂,在宽度为0.75,1.0,1.25 mm及深度为15,30,45,60,75,90 mm的不同裂缝下对混凝土进行修复,通过混凝土抗压试验,测出未修复和修复的试块抗压强度.结果表明:(1)微生物在不同裂缝尺寸下的修复对混凝土强度都有提升作用;(2)裂缝深度对混凝土修复强度的影响更大;(3)在同一裂缝宽度下,修复效果出现了先上升后降低的趋势,在深度为30 mm和45 mm的时候,修复效果最佳.

On Effect of Crack Sizes on Strength of Microbial Repair Concrete

In order to study the repairing effect of microorganism on concrete strength under different crack sizes of different width and depth, Bacillus pasteurii has been selected as the crack repair agent to repair the concrete under different cracks with width (0.75mm, 1.0mm, 1.25mm) and depth (15mm, 30mm,45mm,60mm,75mm,90mm).Through the concrete cube compression test, the compressive strength of repaired and without repaired specimen has been measured. Then a table of the percentage of strength increase been made and analyzed. The experimental results show that, (1) The microorganism can improve the concrete strength under different fracture sizes. (2) The crack depth has a greater influence on the strength of concrete repair. (3) Under the same crack width, the repair effect was first increased and then decreased trend. At depths of 30mm and 45mm, the results were even better.