再碳化后再碱化混凝土组成变化的初步研究

Preliminary Study on the Composition of Realkalisated Concrete after Re-carbonation

为了研究再碳化前后再碱化混凝土组成的变化,利用XRD分析了再碳化前后钢筋混凝土交界面微观结构的变化。研究结果表明,再碳化后混凝土中的长石含量有所降低,碳酸钙含量增多;通过再碱化进入混凝土中的碳酸钠含量再碳化后降低,同时生成了碳酸氢钠;再碳化前后硅酸钙衍射峰面积没有明显变化。

To study the composition of realkalisated concrete after re-carbonation, the interface between the rebar and concrete were analyzed by XRD. The result indicates that after the re-carbonation, the content of the feldspar in concrete decreases and the content of calcium carbonate increases; the content of sodium carbonate by realkalisation through concrete reduces and sodium bicarbonate is genetatee; the peak area of calcium silicate is almost not changed before and after re-carbonation.