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混凝土在水化过程中会产生自生体积变形和温度应变等现象,与混凝土的耐久性有着密切联系,为工程建设各方所关注。对此,在西南某混凝土特高拱坝混凝土浇筑现场,采用无应力计对冷却水管周围两处不同位置处早龄期混凝土的应变进行现场监测,运用成熟度理论考虑混凝土的温度历程对混凝土水化进程的影响,采取一种新方法将总应变计算式解耦,从而摆脱对早龄期混凝土的热膨胀系数为定值的依赖,得出混凝土热膨胀系数在等效龄期下的历程,最终从无应力计变形监测值中分离出温度应变和自生体积变形。试验结果表明:这种方法能考虑混凝土温度因素,精确便捷地对早龄期混凝土的热膨胀系数以及自生体积变形进行分离,给现场混凝土的养护以及防裂施工提供指导。
Concrete in the hydration process will have spontaneous volume deformation and temperature strain and other phenomena, and the durability of concrete is closely linked to the construction of all parties concerned. In this regard, in the southwest of a concrete high arch dam concrete pouring scene, the use of non-stress gauge on the cooling pipe at two different locations around the early age of concrete strain on the spot monitoring, the use of maturity theory to consider the concrete temperature history of concrete water To take a new method to decouple the total strain calculation formula, so as to get rid of the dependence on the thermal expansion coefficient of the early age concrete as a fixed value, get the course of the concrete thermal expansion coefficient under the equivalent age, and finally from Non-stress gauge deformation monitoring values isolated from the temperature strain and autogenous volume deformation. The test results show that this method can take the concrete temperature factor into consideration, and can accurately and conveniently separate the thermal expansion coefficient and autogenous volume deformation of early age concrete and provide guidance for the on-site concrete curing and crack prevention construction.