较详细地介绍了C30普通混凝土和C30钢渣混凝土中无应力计的伴测温度-电阻比关系试验过程中发现普通混凝土中各无应力计在各测试时刻的温度、电阻比呈现出明显的反比关系;钢渣混凝土中各无应力计在各测试时刻的温度、电阻比呈现出明显的正比关系。通过无应力计的计算公式, 结合混凝土在非荷载作用下的变形理论以及实测数据用最小二乘法拟合, 可推导出上述关系产生的原因, 伴测温度和电阻比呈线性关系——当混凝土骨料的热膨胀系数小于无应力计的温度修正系数(温度补偿系数)时, 无应力计的伴测温度-电阻比呈反比关系;当混凝土骨料的热膨胀系数大于无应力计的温度修正系数(温度补偿系数)时, 无应力计的伴测温度-电阻比呈正比关系。
Abstract
The relationship between temperature and electrical resistance for C30 ordinary concrete (Portland cement concrete) and C30 steel slag concrete is investigated in detail. On the basis of monitoring data obtained from non-stress meters, it was found that in both ordinary concrete and steel slag concrete, the temperate is linearly related to the electrical resistance. To be specific, in ordinary concrete the temperate is inversely proportional to electrical resistance while in steel slag concrete the temperate is proportional to electrical resistance. The above findings can be explained by the principles of non-stress meter and non-stress deformation of concrete in association with least-squares-fitted curve of monitoring data as follows: the temperature is inversely proportional to electrical resistance when the thermal expansion coefficient of concrete aggregate is smaller than the temperature correction (compensation) factor of non-stress meter, and vice versa.
关键词
无应力计 /
防汛墙 /
C30普通混凝土 /
C30钢渣混凝土 /
伴测温度 /
电阻比 /
热膨胀系数 /
最小二乘法
Key words
non-stress meter /
flood control wall /
C30 ordinary concrete /
C30 steel slag concrete /
measurement temperature /
electrical resistance /
coefficient of thermal expansion /
least squares fitting
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参考文献
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