碳化作用下不同氯盐掺量水泥浆体的微结构研究

通过加速碳化试验方法, 研究了碳化与氯盐复合作用下水泥浆体的微观结构, 分析了氯盐掺量对水泥基材料的抗碳化性能的影响. 同时, 利用X射线衍射分析了碳化前后样品的物相组成、水化产物类型和微观结构特征. 结果表明, 碳化养护更有利于浆体裂缝的愈合, 但碳化后大孔占比增加; 碳化作用下掺加氯盐会减缓水泥浆碳化速度; 碳化后产生单硫型水化硫铝酸钙和碳酸盐类物质, 钙矾石消失, 浆体的孔隙总体积减少, 孔隙结构得到了细化.

Microstructure study of cement paste with different chloride contentsunder carbonation

The microstructure of cement paste under the compound effect of carbonation and chloride salt was studied by accelerated carbonation test method, and the effect of chloride salt dosing on the anti-carbonation performance of cementitious materials was analyzed. Meanwhile, the physical phase composition, hydration product types and microstructure characteristics of the samples before and after carbonation were analyzed by X-ray diffraction. The results show that carbonation maintenance is more favorable to the healing of slurry cracks, but the percentage of macropores increases after carbonation. The addition of chlorine salts under carbonation slows down the carbonation of cement paste. Monosulfoaluminate hydrate and carbonates are produced after carbonation, and calcium alumina disappears. The total pore volume of the paste is reduced and the pore structure is refined as well.