受热温度和时间对混凝土抗压强度的影响

试验研究不同受热温度和受热时间处理后的C40普通混凝土立方体试块抗压强度,详细描述高温后试块的外观特征及抗压破坏特征,探讨试块抗压性能与受热温度和时间的关系。结果表明,随着火灾温度的升高和燃烧时间的增加,高温后自然冷却混凝土立方体抗压强度整体上呈降低趋势。根据试验结果,建立高温后混凝土立方体剩余抗压强度与受火温度和受火时间的计算公式,并给出不同温度和时间对混凝土抗压强度影响的评定。根据温度和时间对混凝土抗压强度的耦合作用,建立火灾大小分类标准。

Influences of temperature and time on concrete cubic compressive strength

The mechanical properties of C40 ordinary concrete after different temperature and time were experimentally researched.A detailed review of experimental phenomena and the influence of the significant parameters were given,and the relationship between the compressive strength and temperature and time were discussed.The experiments showed that with the exposure of temperature and time increasing,the concrete cubic compressive strength tend to decrease generally.According to the experiment results,the formula for strength-temperature-time relationship after the fire was built.The influence evaluation of the cubic compressive strength for different temperature and time was proposed.According to the coupling effects of temperature and time to the compressive strength,a new fire size classification standard was established.