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按高性能混凝土配比方法制作不同水胶比、Ⅱ级粉煤灰不同掺量的胶砂试件,进行硫酸盐侵蚀试验。采用扫描电镜(SEM)和能谱(EDS)对试件进行微观观测、分析,结果表明:在低水胶比情况下,掺粉煤灰的胶砂试件受高浓度硫酸盐侵蚀破坏的类型是石膏型破坏,未产生钙矾石(Aft)型侵蚀破坏;侵蚀破坏发生在试件表层,侵蚀破坏层的厚度主要与水胶比、粉煤灰掺量、侵蚀龄期、侵蚀溶液浓度等因素有关。
According to the high performance concrete proportioning method, mortar samples with different water / cement ratio and grade Ⅱ fly ash with different dosages were made and the sulfate attack test was carried out. The microscopic observation and analysis of the samples by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) showed that the types of mortar mixed with fly ash were damaged by high concentration sulfate attack Is gypsum-type damage, did not produce ettringite (Aft) -type erosion damage; erosion damage occurred in the specimen surface, the thickness of the erosion damage layer mainly with the water-cement ratio, fly ash content, erosion age, concentration of etching solution Factors related.