沙漠砂混凝土高温后性能劣化及微观结构分析  

Performance deterioration and microstructure analysis of desert sand concrete after elevated temperature

作　　者：朱立晨 陶仁光 刘海峰[1] 杨维武 王修文 ZHU Lichen;TAO Renguang;LIU Haifeng;YANG Weiwu;WANG Xiuwen(School of Civil and Hydraulic Engineering,Ningxia University,Yinchuan 750021,China;Zhongcheng Investment Honghe Construction(Ningxia)Co.,Ltd.,Yinchuan 750004,China)

机构地区：[1]宁夏大学土木与水利工程学院,宁夏银川750021 [2]中城投弘和建筑(宁夏)有限公司,宁夏银川750004

出　　处：《混凝土》2024年第8期106-111,共6页Concrete

基　　金：国家自然科学基金(52168034);宁夏自然基金(2020AAC03044);2022年自治区级大学生创新项目(S202210749103);宁夏高等学校一流学科建设(水利工程学科)项目(NXYLXK2021A03)。

摘　　要：沙漠砂混凝土(DSC)的广泛应用能带来良好的经济效益和环境效益。为了研究高温后DSC性能劣化,对高温后试件进行超声检测、轴心抗压强度试验和SEM分析,研究沙漠砂替代率(DSRR)、温度和冷却方式对超声波速、轴心抗压强度和微观结构的影响。研究表明:DSRR为40%时DSC质量损失率最低,超声波速衰减最小,轴心抗压强度最大;超声波速、损伤度与温度之间满足指数函数关系;建立超声波速与轴心抗压强度损失率、损伤度之间拟合关系模型,研究结果可为DSC工程应用提供技术支撑。Wide application of desert sand concrete(DSC)could provide good economical and environmental benefits.In order to investigate the performance deterioration of DSC after high temperature,ultrasonic testing,axial compressive strength test and SEM analysis were performed.The effects of desert sand replacement rate(DSRR),temperature and cooling method on the ultrasonic velocity,axial compressive strength and microstructure of DSC were investigated.The test results showed that when DSRR was equal to 40%,the mass loss rate of DSC reached the minimum value,the attenuation of ultrasonic velocity was the lowest and the axial compressive strength was maximum value.Ultrasonic velocity and damage met exponential function relationship with temperature.Fitting relation models between ultrasonic velocity and loss rate of axial compressive strength,damage were established,which provided technical support for the engineering utility of DSC.

关 键 词：沙漠砂混凝土 高温 性能劣化 微观分析 

分 类 号：TU528.041[建筑科学—建筑技术科学]