摘要
为了研究高温水冷却后混凝土强度的变化,制作立方体混凝土试块,将其置于不同高温条件下处理,加热处理完成后置于水中冷却,观察高温水冷却后混凝土试块表观现象,对高温水冷试块进行受压加载试验,分析高温后水冷却条件对混凝土抗压性能的影响.研究表明,混凝土试块经过高温处理后在浸水冷却过程中会产生裂纹甚至爆裂;与常温相比,高温水冷混凝土的抗压破坏形态有一定的差别,不再是理想的正倒相接的四角锥破坏形态;高温水冷后,混凝土抗压强度降低,经历500℃高温水冷混凝土强度下降到常温强度的60%左右,800℃时为30%左右.
Cube concrete specimens were prepared and treated under different high temperature conditions.The specimens were placed in water to cool after heating.The apparent phenomena of concrete blocks after high temperature and water cooling were observed.The specimens after high temperature and water cooling were compressed in order to study the strength changes.The test results showed that concrete specimens subjected to high temperature treatment would crack in water cooling process.Compared with the compressive failure pattern of specimens at room temperature,the compressive failure modes of concrete after different temperatures and water cooling were different.The failure pattern was no longer the＂pyramid＂shape.The strength of concrete was decreased to 60%approximately at room temperature when the concrete was water-cooled after 500 ℃ and 30% when after 800 ℃.
出处
《兰州交通大学学报》
CAS
2017年第6期101-105,共5页
Journal of Lanzhou Jiaotong University
关键词
高温
混凝土
水冷却
抗压强度
high temperature
concrete
water cooling
compressive strength
