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本文采用DI-10型应变计测量混凝土热养护过程中的变形,其特点是可以同时测量混凝土由于温度引起的可逆变形与混凝土内部气液相膨胀引起的不可逆变形以及两者叠加的总变形。混凝土在升温初期,可逆变形与不可逆变形同时迅速增加;在恒温阶段总变形保持相对稳定,而混凝土由于内部水分的蒸发而干缩;降温期可逆变形复原,但由于部分可逆变形转嫁为不可逆变形,总变形开始下降,而后略有回升。最后,不可逆变形与总变形重合成为残余变形。在干热养护过程中,选择合适的养护温度,升温速率及相对湿度,可以把混凝土残余变形控制在最小值,减少热养护对于混凝土内部结构的危害性。
In this paper, the DI-10 strain gauge is used to measure the deformation in the concrete thermal curing process. Its characteristic is that it can simultaneously measure the irreversible deformation caused by the temperature-induced reversible deformation of the concrete and the gas-liquid expansion of the concrete, and the total deformation of the two combined. In the initial stage of temperature rise, the reversible deformation and the irreversible deformation increase rapidly at the same time. In the constant temperature phase, the total deformation remains relatively stable, while the concrete shrinks due to the evaporation of the internal moisture; the reversible deformation recovers in the cooling period, but some of the reversible deformation is transferred to the irreversible deformation. The total deformation began to decline and then rose slightly. Finally, irreversible deformation and total deformation are recombined into residual deformation. In the process of dry heat conservation, choosing suitable curing temperature, heating rate and relative humidity can control the residual deformation of concrete to a minimum, and reduce the harm of heat conservation to the internal structure of concrete.