コンクリート仕上げ材料の中性化抑制性能評価における熱重量分析の応用

抄録

Thermogravimetric analysis (TGA) of cement mortar substrates was conducted after the accelerated carbonation test of the cement mortar specimens with the finishing materials in order to evaluate the protective performance of various types of finishing materials against carbonation. Quantitative analysis of calcium carbonate in cement mortar substrates was carried out in the depth direction from the surfaces of the specimens by TGA. The phenolphthalein method was also applied for determining neutralization depth of the specimens. The main results obtained can be summarized as follows: 1) Protective performance of various types of finishing materials against carbonation could be evaluated and compared by the TGA method and the phenolphthalein method. 2) It is well known that the parabolic law can be obtained between carbonation periods and neutralization depth values determined by the phenolphthalein method. It was confirmed that such parabolic, law was also obtained between carbonation periods and the total amounts of calcium carbonate formed in the specimens in this study. The coefficients obtained from the both parabolic relations were reasonably correspondent to each other.