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高温后静置轻骨料混凝土力学性能试验研究
作者：郭荣鑫1，管柏伦1，马倩敏1，颜峰1，王锋宪1，郭佳栋1，2
[1.昆明理工大学 建筑工程学院 云南省土木工程防灾重点实验室（筹），云南 昆明 650500；
2.中建六局土木工程有限公司，天津 300457]
摘要：研究了高温作用温度、静置时间和冷却方式对高温后轻骨料混凝土抗压强度的影响。结果表明，随着温度的升高，轻骨料混凝土的抗压强度基本呈降低趋势；自然冷却试件在温度低于900 ℃时，抗压强度随着静置时间的延长基本趋于稳定；900 ℃高温作用后，试件的抗压强度随静置时间延长明显降低。喷水冷却试件在温度低于300 ℃时，抗压强度随静置时间的延长基本保持不变；500 ℃和700 ℃作用后抗压强度随静置时间延长明显提高；900 ℃作用后，抗压强度随静置时间延长大幅降低。静置1 d时，各温度作用后自然冷却试件的强度均高于喷水冷却试件；静置14、28 d时，经500、700 ℃作用后，喷水冷却试件强度高于自然冷却试件。
关键词：高温；轻骨料混凝土；静置时间；冷却方式；抗压强度
中图分类号：TU528.2 文献标识码：A 文章编号：1001-702X（2020）07-0035-03
Experimental study on mechanical properties of lightweight aggregate concrete long-stayed after high temperature
GUO Rongxin1，GUAN Bolun1，MA Qianmin1，YAN Feng1，WANG Fengxian1，GUO Jiadong1，2
[1.Faculty of Civil Engineering and Mechanics，Kunming University of Science and Technology，
Key Laboratory of Yunnan Province for Disaster Reduction in Civil Engineering（Under preparation），Kunming 650500，China；
2.China Construction Sixth Engineering Bureau Civil Engineering Company，Tianjin 300457，China]
Abstract：In this paper，effects of operating temperature，standing time and cooling methods on compressive strength of lightweight aggregate concrete after high temperature were studied. Results show that compressive strength of lightweight aggregate concrete decreased with the increase of temperature. Compressive strength of the specimens cooled naturally tended to be stable with the passage of standing time before 900 ℃；after 900 ℃，compressive strength of the specimens decreased significantly with the standing time. Before 300 ℃，strength of the water-cooled specimens was basically unchanged with the standing time；after 500 ℃ and 700 ℃，strength increased with the standing time；after 900 ℃，strength decreased greatly with the standing time. After 1 d standing，strength of the specimens cooled naturally was always higher than that of the water-cooled specimens；after both 14 d and 28 d standings，strength of the water-cooled specimens was higher than that of the specimens cooled naturally after 500 ℃ and 700 ℃.
Key words：high temperature，lightweight aggregate concrete，standing time，cooling method，compressive strength