摘要
测定了水泥水化电阻率变化,根据浆体电阻率和Ca(OH)2含量的变化规律可将水泥水化分为初始期、诱导期、加速期、减速期4个阶段。诱导期开始时,浆体电阻率突然增大,热重/差示扫描量热综合分析表明此时可能生成了中间反应物水化铝酸钙。水化物包裹在水泥颗粒表面,形成保护层,阻止水泥进一步水化,水化进入诱导期,这与诱导期的"保护层理论"相符。电阻率微分曲线在加速中期有极大值,X射线衍射分析表明该极大值的出现与钙矾石(AFt)转化为单硫型铝酸钙水化物(AFm)有关。研究发现电阻率微分曲线与放热速率曲线的对应性较好,诱导期结束后浆体电阻率与其Ca(OH)2质量分数成线性关系,电阻率变化可反映水化程度变化。
The resistivity of cement pastes in the early age was tested, according to the changes of resistivity and Ca(OH)2 content in the hardened pastes, cement hydration can be divided into four stages: the dissolution period, the induction period, the acceleration period and the deceleration period. The resistivity grows quickly when the induction period begins, differential scanning calorimeter and thermogravimetry analysis indicated that there were intermediate products at that time, which might be calcium alum...
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2008年第4期431-435,共5页
Journal of The Chinese Ceramic Society
基金
科研院所社会公益研究专项(2004DIB3J114)资助项目
关键词
电阻率
氢氧化钙
钙矾石
早期水化
resistivity
calcium hydroxide
ettringite
hydration degree
early age hydration
