Based on the fact that concrete undergoes autogenous deformation and temperature deformation during its hydration advancement, which is closely linked with the durability of concrete and is concerned by engineering construction parties, two stress-free meters that were located on different places around the cooling pipe in a southwest concrete extra-high arch dam construction site were used to monitor the total deformations, and a new method with the consideration of concrete temperature history was adopted for decoupling the monitored deformations. This method could avoid the dependence on taking thermal expansion coefficient of early age concrete as a constant value, thus, the curve of thermal expansion coefficient vs. equivalent age was got and finally temperature deformation and autogenous deformation were separated from the data. Test results showed that the method could consider temperature history, separate the thermal expansion coefficient and autogenous deformation of concrete at early age more precisely and easily, and provide guidance for the site concrete curing and anti-crack constructions.
