水泥混凝土自修复技术试验研究

发布时间：2018-08-07 19:42

【摘要】：混凝土材料是当今结构工程用量最多的人工材料之一，但混凝土结构易出现收缩、开裂等病害。如何减少开裂、修复裂缝成为工程界亟待解决的问题，本文采用仿生裂缝自修复技术解决混凝土裂缝问题。通过查阅大量文献和相关试验研究，选择环氧E-51为自修复混凝土的胶黏剂，830固化剂为其固化成分，制备出两种芯材物质的微胶囊。将环氧E-51或830固化剂作为囊芯物质，以尿素和甲醛制备出脲醛树脂作为微胶囊的囊壁，获得了配制胶黏剂微胶囊用尿素、甲醛、环氧合理掺配比例为1:2:1.4，固化剂微胶囊用尿素、甲醛、830固化剂的合理掺配比例为1:2:1。通过电镜扫描仪观察到形状规则的微胶囊颗粒。搅拌速度、加水量和混合物的酸碱度对合成微胶囊的分散性有较大影响。通过微胶囊的制备试验得出，搅拌速度300r/min、加水量与囊芯质量比在2.86~3.57、PH值4.5左右能得到分散效果较好的微胶囊。将微胶囊按一定比例加入到水泥砂浆中，制备出具有裂缝自修复性能的双组份自修复砂浆，，将胶黏剂微胶囊和830固化剂直接加入砂浆，制备出修复性能优于双组份自修复砂浆的单组份自修复砂浆。配制出单组份自修复混凝土，在微胶囊掺量为水泥质量8%内，随着掺量的增加，自修复混凝土修复性能越好，在自修复混凝土的断裂面可看到胶黏剂修复裂缝后的白色聚合物。
[Abstract]:Concrete material is one of the most used artificial materials in structural engineering nowadays, but concrete structure is prone to shrinkage, cracking and other diseases. How to reduce cracking and repair cracks has become an urgent problem in engineering field. In this paper, bionic crack self-repairing technology is adopted to solve the problem of concrete cracks. The epoxy E-51 was selected as the curing agent of self-repairing concrete, and the microcapsules of two kinds of core materials were prepared by consulting a large number of literatures and related experimental studies. Using epoxy E-51 or 830 curing agent as capsule core, urea-formaldehyde resin was prepared from urea and formaldehyde as the capsule wall of microcapsule. Urea and formaldehyde were obtained for the preparation of adhesive microcapsule. The rational blending ratio of epoxy resin was 1: 2: 1.4, and urea for curing agent microcapsule was obtained. The reasonable blending ratio of formaldehyde 830 curing agent is 1: 2: 1. Microcapsule particles with regular shape were observed by electron microscope scanner. Mixing speed, water content and pH of the mixture have great influence on the dispersity of the microcapsules. Through the preparation test of microcapsules, the results show that the microcapsules with good dispersion effect can be obtained when the mixing speed is 300 r / min, the ratio of water to core mass is about 2.86 ~ 3.57% and the PH value is about 4.5. Two component self-repairing mortar with crack self-repairing property was prepared by adding microcapsule into cement mortar according to a certain proportion. Adhesive microcapsule and 830 curing agent were added directly to mortar. One component self-repairing mortar with better repair performance than two-component self-repairing mortar was prepared. A single component self-repairing concrete is prepared. When the content of microcapsule is 8% of cement mass, the better the repairing performance of self-repairing concrete is, and the white polymer after repairing crack can be seen on the fracture surface of self-repairing concrete.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU528.45

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