低温作用下沙漠砂替代率和粉煤灰掺量对混凝土抗压强度影响  

EFFECTS OF DESERT SAND REPLACEMENT RATE AND FLY ASH CONTENT ON THE COMPRESSIVE STRENGTH OF CONCRETE UNDER LOW TEMPERATURE

作　　者：马映昌 刘海峰[1] 张明虎 MA Yingchang;LIU Haifeng;ZHANG Minghu(College of Civil and Hydraulic Engineering,Ningxia University,Yinchuan 750021,China)

机构地区：[1]宁夏大学土木与水利工程学院,银川750021

出　　处：《工业建筑》2020年第5期81-87,80,共8页Industrial Construction

基　　金：国家自然科学基金项目(51368048,11162015);教育部“长江学者和创新团队发展计划”创新团队项目(IRT1067)。

摘　　要：为研究低温作用下沙漠砂替代率和粉煤灰掺量对混凝土抗压强度的影响,进行单掺沙漠砂、单掺粉煤灰、双掺沙漠砂和粉煤灰混凝土在室温,-10,-20,-30℃时的抗压强度试验,分析温度、沙漠砂替代率和粉煤灰掺量对混凝土抗压强度的影响规律,建立混凝土抗压强度与温度、沙漠砂替代率和粉煤灰掺量之间回归关系模型。试验结果表明:随着温度降低,低温下混凝土抗压强度呈增大趋势,低温后混凝土抗压强度随温度降低呈减小趋势;对于单掺沙漠砂混凝土,混凝土抗压强度随沙漠砂替代率增加呈先增大后减小趋势,沙漠砂替代率50%时混凝土抗压强度最大;对于单掺粉煤灰混凝土,混凝土抗压强度随着粉煤灰掺量增加呈减小趋势;对于双掺沙漠砂和粉煤灰混凝土,沙漠砂替代率50%,粉煤灰掺量10%时,混凝土抗压强度最大。In order to study the effects of desert sand replacement rate and fly ash content on the compressive strength of concrete under low temperature,the compressive strength tests of concrete with desert sand,fly ash,the mixture of desert sand and fly ash under room temperature,-10℃,-20℃,-30℃were carried out.The influences of temperature,desert sand replacement rate and fly ash content on the compressive strength of concrete were analyzed.The regression model between the compressive strength of concrete with temperature,desert sand replacement rate and fly ash content was established.The test results showed that the compressive strength of concrete increased under low temperature with the decrease of temperature.Whereas,after being subjected to low temperature,the compressive strength of concrete decreased with the decrease of temperature.For the concrete with desert sand,the compressive strength of concrete increased firstly,and then decreased with the increase of desert sand replacement rate.The compressive strength of concrete with desert sand replacement rate 50%was the maximum value.For the concrete with fly ash,the compressive strength of concrete tended to decrease with the increase of fly ash content.For the concrete with the mixture of desert sand and fly ash,the compressive strength of concrete reached the maximum value when desert sand replacement rate and fly ash content were 50%and 10%,respectively.

关 键 词：低温 混凝土 沙漠砂替代率 粉煤灰掺量 抗压强度 

分 类 号：TU528[建筑科学—建筑技术科学]