摘要
水泥基材料的超低温性能与其常温以及低温性能有很大差异。研究了超低温养护时间、常温养护时间、含水率等因素对普通砂浆、高强砂浆、高强引气砂浆在–110℃超低温力学性能的影响,并与其常温性能进行了比较。结果表明:超低温下砂浆强度不仅取决于超低温养护时间还取决于水灰比、常温养护时间、砂浆含水率及孔隙水结冰程度等因素。砂浆超低温强度在早期随着超低温养护时间增加而快速增长,后期抗折强度、抗压强度分别于3,7d后趋于稳定。砂浆常温下压折比大于超低温下的压折比,砂浆在超低温下脆性降低。含水率是影响超低温下砂浆强度的最显著因素之一,且孔隙水对砂浆超低温抗折强度的提高率大于其对抗压强度的提高率。
The properties of cement based materials at ultra low temperature quite differed from those at room temperature or at low temperature.Influences of curing time of ultra low temperature,curing time of room temperature and moisture content on mechanical properties of three kinds of mortars（ordinary mortar,high strength mortar,air entrained high strength mortar） at ultra low temperature（–110 ℃） were investigated.The results show that mortar strength at ultra low temperature greatly depends on ultra low temperature curing time as well as water to cement ratio,room temperature curing time,porosity,moisture content and water freezing degree etc..The strength of mortar at ultra low temperature grows rapidly with the increase of ultra low temperature curing time at early stage.Its flexural strength and compressive strength stabilize after 3,7 d respectively.The ratio of compressive strength to flexural strength of mortar at room temperature is higher than that at ultra low temperature,indicating the decrease of brittleness of mortar at ultra low temperature.Moisture content,improving flexural strength at greater degree than compressive strength,is the one of key factors affecting the strength at ultra low temperature.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2010年第4期602-607,共6页
Journal of The Chinese Ceramic Society
基金
"十一五"国家科技支撑项目(2006BAJ05B07)
关键词
超低温
砂浆
力学性能
含水率
ultra low temperature
mortar
mechanical properties
moisture content
