环境因素对混凝土强度特性的影响

Influence of Environmental Factors to the Concrete Strength Character

通过对哑铃形混凝土试件和立方体试件进行轴心抗拉、轴心抗压、劈裂拉伸试验,研究了混凝土在不同温度、湿度条件下的力学性能,并从微观角度指出混凝土内部孔隙中的自由水是引起混凝土力学特性变化的重要因素。试验分析表明:混凝土在低温下其轴心抗压强度、轴心抗拉强度和劈拉强度与在室温下相比有所提高,而在饱和条件下却降低了;饱和混凝土在低温条件下的强度有较大幅度提高。

Through the tests of axial tensile,compressive and split-tensile strength of dumbbell-shape and cube concrete specimen,the paper studies the mechanical performance of concrete under different conditions of temperature and dampness and points out that the free water in the pore of concrete is the important factor causing the variations of mechanical character of concrete from microcosmic point of view.It is shown by the tests and analysis that the axial tensile strength,compressive strength and split-tensile strength of concrete under low temperature conditions are somewhat increased comparing with that of under room temperature,but decreased under saturation condition and;the strength of saturated concrete is greatly increased under the low temperature conditions.