摘要
研究了水泥石及不同集料掺量水泥砂浆在室温（20℃）至550℃时抗压强度的变化．结果表明，水泥石及同灰砂比的水泥砂浆，其抗压强度变化均可分为3个阶段：第1阶段（20～150℃），水泥石及灰砂比〉1／3的水泥砂浆抗压强度有所增加，而灰砂比〈1／3的水泥砂浆抗压强度则有所降低；第2阶段（150～180℃），抗压强度变化平缓；第3阶段（180～550℃），抗压强度呈明显下降趋势．同温度下水泥砂浆的抗压强度随集料掺量的增加而降低．运用DSC／TG，XRD和热膨胀性能测试对以上规律进行了机理分析．
Compressive strength of cement mortar was studied from room temperature to 550 ℃ with cement paste and different fine aggregate content. The result shows that development of compressive strength of cement or cement mortar with same m（C）/m（S） is divided into three stages： compressive strength increases to some extent when cement or cement mortar with m（C）/m （S）〉1/3, but compressive strength decreases to some extent when m（C）/m（S）〈1/3 in the first stage（room temperature to 150℃）; compressive strength changes gently in the second stage（150 -180 ℃） ; compressive strength decreases significantly in the third stage （180 - 550 ℃）. And compressive strength of cement mortar decreases with fine aggregate content increasing in the same temperature. Through the analyst of DSC, XRD and thermal expansion behavior measurement the mechanism how compressive strength changes with temperature is proposed.
出处
《建筑材料学报》
EI
CAS
CSCD
2008年第6期699-703,共5页
Journal of Building Materials
基金
国家自然科学基金重点项目(50438010)
关键词
水泥砂浆
抗压强度
机理
高温
cement mortar
compressive strength
mechanism
elevated temperature
