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通过对20个经历四种不同高温后的素混凝土和无机胶粘贴碳纤维布加固混凝土圆柱体的轴压力学性能试验,研究了无机胶粘贴碳纤维布约束混凝土在经历不同高温后抗压强度、极限压应变和应力-应变关系的变化,得出所经历高温过程对其轴压力学性能的影响。结果表明:无机胶粘贴碳纤维布约束混凝土经历高温后的破坏形态与常温下基本相似;其抗压强度在经历100℃高温后,下降仅5%左右,在经历200℃、300℃和400℃高温后,约为常温试件的85%~90%;无机胶粘贴碳纤维布约束混凝土的极限压应变在100℃高温后略有减小,在200℃~400℃高温后则比常温下增大20%左右;碳纤维约束对核心混凝土抗压强度的提高作用,会随试件所经历温度的升高而逐渐增大;无机胶粘贴碳纤维布约束混凝土的应力-应变曲线在经历高温后会明显趋于扁平,并且多了一个呈上凹状的压密阶段。
By testing the axial compressive properties of 20 concrete cylinders strengthened with plain concrete and inorganic adhesive bonded carbon fiber cloth after four different high temperatures, the compressive strength of concrete confined by inorganic adhesive bonded carbon fiber cloth under different high temperatures was studied. The ultimate compressive strain and the stress-strain relationship, and obtain the influence of the high temperature process experienced on the axial pressure mechanical properties. The results show that the failure morphology of the confined concrete with CFRP-bonded concrete is basically similar to that at room temperature. The compressive strength decreases only about 5% after it reaches 100 ℃. After undergoing 200 ℃, 300 ℃ and 400 ℃ After high temperature, it is about 85% ~ 90% of the specimen at room temperature. The ultimate compressive strain of the concrete confined with inorganic adhesive carbon fiber cloth decreases slightly after the high temperature of 100 ℃, and then increases at 200 ℃ ~ 400 ℃ Which is about 20% larger than that of the control. The effect of the carbon fiber constraint on the compressive strength of the core concrete increases gradually with the temperature experienced by the specimen. The stress-strain curve of the concrete with the carbon- Obviously tends to be flat, and more than a concave stage of the compaction.