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为了解决采用标准试验方法无法测试早龄期混凝土弹性模量的问题,采用温度-应力试验法,选用测量精度为0.1kN的高精度荷载传感器,控制混凝土试件在极短时间(<5s)内的位移量为10~15μm,可以准确测得早龄期的混凝土弹性模量.综合采用温度-应力试验测得的48h内的弹性模量数据与采用标准试验法测得的3~28d的弹性模量数据,建立了以等效龄期作为时间尺度、以第一零应力时间为起始测试点的混凝土弹性模量随时间发展的函数关系.
In order to solve the problem of using the standard test method to test the elastic modulus of early age concrete, the temperature-stress test method was used to select the high precision load cell with the measuring precision of 0.1kN to control the concrete specimen in a very short time (<5s) Of the displacement of 10 ~ 15μm, can accurately measure the early age of the concrete elastic modulus.Using the temperature - stress test measured within 48h elastic modulus data and the standard test method measured 3 ~ 28d of elasticity The elastic modulus of concrete with the equivalent age as the time scale and the test point with the first zero stress time as a function of time was established.