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常压养护粉煤灰多孔混凝土制品具有优良的胶凝性、节省资源能源、利用工业废料 ,符合可持续发展战略 ;但因其收缩大 ,影响推广应用。本文从产生收缩的机理研究入手 ,选择一种绿色剂———稀土粉尘 (XF)加入 7%时产生显著的绿色效应 :抗压强度提高 49～ 88% ,各龄期收缩值减小 ,极限干缩率减小 18% ,使工业废料粉煤灰多孔混凝土制品性能获得升华。通过化学分析和扫描电镜形貌观察证明 :增强和减缩机理主要是由于XF粉尘的微粉作用、其化学组成与粉煤灰胶结料中的Ca(HO) 2 反应 ,生成不溶于水的C—S—H凝胶、生成强度高且微膨胀的E盐所致。
Atmospheric pressure curing fly ash porous concrete products with excellent gelling, saving resources and energy, the use of industrial waste, consistent with the strategy of sustainable development; but because of its shrinkage, affecting the promotion and application. This paper starts with the research on the mechanism of shrinkage. Choosing a green agent --- Rare earth dust (XF), when added with 7%, produces a significant green effect: the compressive strength increases by 49-88%, the shrinkage value decreases with each age, and the limit Shrinkage reduction of 18%, the industrial waste fly ash porous concrete products performance sublimation. The results of chemical analysis and scanning electron microscopy showed that the mechanisms of enhancement and reduction were mainly due to the effect of XF dust, whose chemical composition reacted with Ca (HO) 2 in the fly ash cement to produce water-insoluble C-S -H gel, resulting in high strength and slightly swollen E salt.