不同高温对含预制裂隙混凝土力学性能的影响

Influence of Different High Temperatures on Mechanical Properties of Precast Cracked Concrete

为了研究不同温度对含预制裂隙混凝土力学性能的影响,采用自制的混凝土试样进行试验,裂隙为混凝土内部45°的预制裂隙,对试样进行不同高温后的单轴压缩试验,试验结果表明:300℃作用后混凝土的单轴抗压强度较常温有较大提高,并表现了良好的脆性特征;500℃作用后混凝土的单轴抗压强度较常温有所降低;600℃作用后混凝土的单轴抗压强度较常温有较大幅度的下降,并且表现出一定的塑形特征。实验结果表明不同的高温对混凝土的力学性能影响较大。

In order to study the influence of different temperatures on the mechanical properties of concrete with precast crack, a self-made concrete sample was used for testing. The crack was the precast crack of 45° inside the concrete. Uniaxial compression test was carried out on the sample after different high temperatures.After 300 ℃ effect of concrete under uniaxial compressive strength than the normal temperature increased greatly, and shows good brittle characteristics, after 500 ℃ effect of concrete under uniaxial compressive strength than the normal temperature is low, after 600 ℃ role the uniaxial compressive strength of concrete have more than normal temperature drop, and show some shape characteristic, the experimental results show that different influence on high temperature on the mechanical properties of concrete.