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研究了养护温度对微膨胀复合胶凝材料膨胀效能、强度、水化程度及微观构影响.果表明:标准养护条件下(20℃),晶状钙矾石基本都生长在孔缝中,对膨胀贡献较小,凝胶颗粒状钙矾石对膨胀贡献更大;提高养护温度(40℃)能够促进膨胀剂水化,但发展更快强度限制了膨胀发展,凝胶或微晶状钙矾石对孔隙填充使中等养护温度硬化胶凝材料浆体最为密实;更高养护温度时(60℃),硬化浆体内部生成了大量粗棒状钙矾石晶体,导致其在水化早期即产生过大膨胀,持续高温高湿环境使少量钙矾石发生分,致使后期限制膨胀率有所降低.适度膨胀对硬化浆体孔构是有益,能够使大孔明显减少,但过大膨胀会对孔构造成不利影响,大孔数量偏多.
The effect of curing temperature on the expansion efficiency, strength, hydration degree and microstructure of the micro-expansive composite cementitious material was studied. The results show that under normal curing conditions (20 ℃), crystalline ettringite basically grows in the pore seam, The contribution of swelling is smaller and gel-granular ettringite contribute more to expansion; raising the curing temperature (40 ° C) can promote the hydration of the expanding agent, but faster development limits the development of swelling, gel or microcrystalline alum The pore-filling of stone makes the medium-curing temperature-hardened cementitious material slurry the most dense; when the curing temperature is higher (60 ℃), a large amount of coarse-grained ettringite crystals are generated in the hardened paste, Large expansion, continuous high temperature and high humidity environment to a small amount of ettringite occurred points, resulting in post-limiting expansion rate decreased moderately expansion of the pore structure of the hardened paste is beneficial, can significantly reduce the macropores, but too large expansion of the hole Constructed to adversely affect the large number of large holes.