摘要
超低温下混凝土骨料之间因热膨胀系数差异而产生的力势必会对结构产生影响,在结构设计中需要加以考虑。本研究在超低温环境下采用电阻应变计测试技术对水泥砂浆和石材两种材料热膨胀系数进行测量,得出其平均线膨胀系数随温度的变化规律。对比分析两种相互垂直取样方向对水泥砂浆和石材热膨胀系数的影响。研究结果表明:水泥砂浆和石材热膨胀系数随着温度的降低有着相似的变化规律,随温度的降低而减小;水泥砂浆和石材相互垂直取样方向上的热膨胀系数差异较大,说明在超低温下其热膨胀系数是各向异性的。实验得到水泥砂浆和石材在不同温度下的热膨胀系数值,为LNG储罐设计提供实验依据。
The force generated by the difference of thermal expansion coefficient between concrete aggregates will inevitably affect the structure at cryogenic temperatures, which needs to be taken into consideration in structural design. The coefficient of thermal expansion values of two kinds of materials, cement mortar and stone, were measured by the resistance strain gauge testing technology at cryogenic temperatures, and the relationship between mean linear expansion coefficient and temperature was obtained. The influence of sampling directions in this study was considered. The test results show that the coefficient of thermal expansion values of cement mortar and stone have a similar change rule, which decrease with the decrease of temperature. The sampling directions have a great effect on coefficient of thermal expansion values, which illustrate the coefficient of thermal expansion of cement mortar and stone is anisotropic at cryogenic temperatures. The coefficient of thermal expansion of cement mortar and stone at different temperatures is obtained, providing experimental basis for the design of LNG storage tank.
作者
沈子豪
李扬
刘奎周
SHEN Zi-hao;LI Yang;LIU Kui-zhou(School of Civil Architecture and Environment,Hubei University of Technology,Wuhan 430068,China)
出处
《硅酸盐通报》
CAS
北大核心
2019年第4期1258-1262,共5页
Bulletin of the Chinese Ceramic Society
基金
国家自然科学基金(51508171)
湖北省桥梁安全监控技术及装备工程技术研究中心开放基金(QLZX2014001)
湖北工业大学科研启动基金(BSQD14044)
国家级大学生创新创业计划项目(201810500034)
关键词
水泥砂浆
石材
超低温
热膨胀系数
应变计
mortar
stone
cryogenic temperature
thermal expansion coefficient
strain gauge
