环境温、湿度对混凝土收缩测试结果的影响

Effect of Environmental Condition on Test of Concrete Shrinkage

研究了温度和湿度异常对混凝土收缩的影响.结果表明温度波动造成热胀冷缩是其影响收缩测试的主要原因,热胀冷缩变形是可逆的,可通过线性叠加对收缩测试结果补偿.湿度异常对收缩的影响与相对湿度差值和持续时间成正比,与试件最小截面尺寸成反比,可据此对测试结果进行修正.

The effect of environmental temperature and relative humidity on the test results of concrete shrink-age are investigated. The results show that thermal expansion is responsible for the influence of fluctuant temperature on the shrinkage test of concrete. However, due to the fact that the thermal deformation is reversible, the effect of temperature on the shrinkage test can be compensated by linear superposition of thermal expansion and total strain to eliminate the effect of unusual temperature. The variation in the shrinkage of concrete owing to unusual external humidity is proportional to the deviation of relative humidity difference and the duration of the abnormal humidity lasted, and is inversely proportional to the minimum section size of specimen. Then the shrinkage test results can be modified accordingly.