不同冷却方式下高温混凝土性能研究

发布时间：2018-06-14 21:08

  本文选题：混凝土 + 高温　； 参考：《新型建筑材料》2017年08期

【摘要】：对混凝土立方体试件进行高温烧结,分析了试件外观裂缝的产生和发展,质量损失率等宏观变化。通过对高温混凝土试件在不同冷却方式下的抗压强度、劈拉强度进行力学性能试验,对比出不同冷却方式下高温混凝土的抗压强度及劈拉强度的差异和变化趋势,解释了高温混凝土强度变化的原因,拟合出对应的强度变化曲线。结果表明:高温混凝土经自然冷却后出现强度反弹迹象,在400℃达到峰值39.9 MPa;喷淋冷却使得混凝土抗压强度在500℃达到峰值36.7 MPa,在500℃后,强度高于自然冷却后的混凝土强度。劈拉强度随着温度升高持续降低,800℃时强度损失达到80%。该研究可为受高温后的混凝土结构的设计、分析提供理论依据。
[Abstract]:The concrete cube specimens were sintered at high temperature. The appearance cracks and the mass loss rate of the specimens were analyzed. The compressive strength and splitting tensile strength of high temperature concrete specimens under different cooling conditions are tested by mechanical performance tests. The differences and trends of compressive strength and splitting tensile strength of high temperature concrete under different cooling methods are compared. The reason of strength change of high temperature concrete is explained and the corresponding curve of strength change is fitted. The results show that the strength rebound of high temperature concrete after natural cooling shows a peak value of 39.9 MPA at 400 鈩，

本文编号：2018967