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为了提高水泥基材料早期裂缝的自修复效果,采用了一种具有矿化作用的碳酸酐酶微生物.利用渗水法和图像处理技术研究了该微生物修复剂对不同裂缝宽度、不同开裂龄期下水泥净浆裂缝的修复情况.同时通过XRD,SEM和EDS技术对裂缝沉积物进行成分分析,并结合Photoshop软件研究了裂缝处矿化Ca CO3的沉积量.研究结果表明:开裂龄期为7 d时,宽度在0.5mm以下的裂缝很快修复完全,0.5~0.8 mm的裂缝修复受到一定限制,0.8 mm以上的裂缝较难修复完全;开裂龄期为7 d时,该自修复剂具有良好的修复效果,但开裂龄期越长,越难以修复;通过XRD分析确定了产物为方解石型Ca CO3;Photoshop软件中标尺工具测得的裂缝表面Ca CO3的沉积深度随裂缝宽度的增大而减小.
In order to improve the self-healing effect of early cracks on cement-based materials, a kind of carbonic anhydrase microorganism with mineralization was used.Using water seepage method and image processing technology, the effects of the microbial restorative agent on the cementing capacity under different crack widths and different cracking ages In the meantime, the composition of fracture deposits was analyzed by XRD, SEM and EDS, and the deposition amount of mineralized CaCO 3 in fractures was studied by using Photoshop software.The results show that when the cracking age is 7 d , The cracks with a width of less than 0.5mm are quickly repaired completely, the cracks with a width of 0.5-0.8mm are subject to some restrictions, and the cracks with a width of more than 0.8mm are more difficult to repair completely. The self-healing agent has a good repair when the cracking age is 7 days However, the longer the cracking age, the harder it is to repair. The product is calcite CaCO 3 by XRD analysis. The depth of CaCO 3 deposition on the crack surface measured by the ruler tool in Photoshop software decreases with the increase of crack width.