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通过分析水泥混凝土的时间依赖变形原理和设计无应力圆筒,提出了一种温湿度耦合作用下水泥混凝土膨胀系数及干缩系数的测试方法,对干缩系数进行了理论推导计算。在实际路面中采用此方法埋设相关设备并结合采集的典型数据进行分析。结果表明:此方法得到的水泥混凝土热应变和干缩应变真实可靠,通过数据处理可快速得到其热膨胀系数、线膨胀系数和干缩系数;对于试验段水泥混凝土,得出其热膨胀系数为9.006μm/℃,线膨胀系数为9.305μm/℃,干缩系数为657.7μm;同时,设计的无应力圆筒可以保证测试需要,无孔无应力圆筒内水泥混凝土只经历温度变化,有孔无应力圆筒同时经历温度和湿度作用,筒内外湿度交换良好。
By analyzing the time-dependent deformation principle of cement concrete and designing a stress-free cylinder, a testing method for the expansion coefficient and shrinkage coefficient of cement concrete under the coupling of temperature and humidity is proposed. The shrinkage coefficient is deduced theoretically. In the actual pavement using this method to embed the relevant equipment and combined with the typical data collected for analysis. The results show that the thermal strain and shrinkage strain of cement concrete obtained by this method are real and reliable. The thermal expansion coefficient, linear expansion coefficient and shrinkage coefficient can be quickly obtained by data processing. For the concrete in the experimental section, the thermal expansion coefficient is 9.006μm / ℃, the coefficient of linear expansion is 9.305μm / ℃ and the shrinkage coefficient is 657.7μm. Meanwhile, the designed stress-free cylinder can guarantee the test. The cementless concrete with no hole and no stress only experiences temperature change, Cylinder at the same time experience the role of temperature and humidity, humidity inside and outside the exchange well.