摘要
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。
The flyash porous concrete products at ordinary pressure have good gelation,save resources and energy and make use of industrial waste material,therefore can accord with continuously developing strategy.But its large shrinkage affects spread for application.This paper starts with the study of the mechanism as green agent in this paper,when 7% of XF was added the remarkable green effects produced:the compressive strength rises 49～88%,the shrinkage value reduces for every age,limit drying shrinkage ratio decreases 18%.The property of flyash porous concrete products obtains sublimation.According to chemical analysis and SEM figure observation show that:the mechanism of strengthening and reduced shrinkage is principaaly due to the micropowder action of XF dust,the action of its chemical composition and Ca(OH) 2 from flyash cementing material produces C S H gel not soluble in water,and produces E salt with high strength and microexpand. 〔
出处
《混凝土》
CAS
CSCD
北大核心
2000年第2期21-24,共4页
Concrete
关键词
粉煤灰
多孔混凝土
绿色剂
减缩效果
稀土粉尘
Flyash,Ordinary pressure curing,Porous concrete,Rare earth dust,Green agent,Reduce shrinkage effect
