碱液处理对硬化砂浆中胶凝材料质量分数测定的影响

基于测定硬化混凝土中胶凝材料质量分数的可溶性 $ SiO_{2} $ 法,文章结合宏观试验和微观分析,研究碱液处理对硬化砂浆中胶凝材料质量分数测定试验的影响,结果显示:碱液可进一步溶解未被酸液溶解的 C-S-H 凝胶,而其对硅质原材料的侵蚀可以忽略不计;碱液处理减小了硬化砂浆中胶凝材料质量分数测定试验的误差,是影响试验结果的重要因素之一;含有碱液处理步骤的可溶性 $ SiO_{2} $ 法,可以较准确地测出掺合料是粉煤灰和矿粉的硬化砂浆中胶凝材料(水泥和矿粉)的质量分数。

Based on the soluble $ SiO_{2} $ method for determining the content of cementitious material in hardened concrete, the effect of lye treatment on the determination of the cementitious material content in hardened mortar was studied via macroscopic tests and microscopic analyses. The results showed that the C-S-H gel that was not dissolved by the acid could be dissolved by the lye solution in the sample, and the erosion of the siliceous raw material by the lye solution was negligible; the testing errors were reduced by the lye treatment in the determination of the content of the cementitious material in the hardened mortar, and the lye treatment was one of the important factors affecting the testing results; the content of cementitious material (cement and mineral powder) in the hardened mortar with the admixture of fly ash and mineral powder could be measured more accurately by the soluble $ SiO_{2} $ method with lye treatment.