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为了研究低温作用对混凝土抗压特性的影响,通过试验,测定了经不同负温作用后混凝土不同龄期的轴心抗压强度、抗压弹性模量和抗压峰值应变,并与常温(20℃)时的结果作对比。试验结果表明,龄期相同时混凝土的抗压强度、抗压强度相对值、抗压弹性模量和抗压弹性模量相对值都随着温度的降低逐渐增大;相同温度下,混凝土轴心抗压强度随着龄期的延长而增大,其中14 d之前抗压强度随龄期的变化较快,而14 d之后变化趋势放缓;混凝土各龄期的轴心抗压强度与温度之间呈二次函数关系变化,其中相关性系数都大于0.99;随着温度的降低,混凝土抗压峰值应变和抗压峰值应变相对值逐渐减小。
In order to study the influence of low temperature on the compressive properties of concrete, the axial compressive strength, compressive elastic modulus and compressive peak strain at different ages after different negative temperature effects were measured and compared with the normal temperature ℃) when the results for comparison. The test results show that the relative compressive strength, relative compressive strength, compressive elastic modulus and compressive elastic modulus of concrete all increase with the decrease of temperature at the same age. Under the same temperature, Compressive strength increases with age, of which the compressive strength changes rapidly with age before 14 days, but changes slowly after 14 days. The axial compressive strength and temperature at different ages The correlation coefficient was greater than 0.99. With the decrease of temperature, the relative compressive peak compressive strain and compressive strain of concrete gradually decreased.