摘要
以受热温度为变化参数,进行了高温后机制砂混凝土圆柱体抗压强度试验,分析了高温后喷水冷却试块的表面状况、烧失率和抗压强度变化情况。研究表明:高温后喷水冷却的机制砂混凝土试块颜色呈现出青灰-灰白的变化趋势;喷水冷却试块遍布孔洞,严重剥落;当混凝土强度等级为C50以上,或温度高于600℃时,喷水冷却的烧失率急剧增大。升温是劣化机制砂混凝土抗压强度的重要因素,800℃时,喷水冷却试块的残余抗压强度仅为常温时的19.02%。基于试验数据拟合了高温后喷水冷却下机制砂混凝土圆柱体试块的抗压强度计算公式。
In this paper,the compressive strength test of machine-made sand concrete cylinder after high temperature is carried out with the heating temperature as the variable parameter.The change of apparent phenomenon,burning loss rate and compressive strength of the test block after high temperature are analyzed.The results show that the test block of machine-made sand concrete after cooling by spraying water at high temperature presents a gradual trend of grey-grayish white.Water spray cooled test block is full of holes with serious peeling.When the concrete strength grade is above C50,or the temperature is above 600℃,the burning loss rate of water spraying cooled test block increases sharply.Temperature rise is an important factor for deterioration of compressive strength of machine-made sand concrete.When T=800℃,the residual strength of water-cooled test block is only 19.02%of that under normal temperature.Finally,based on the experimental data,the formula for calculating the compressive strength of the machine-made sand concrete cylinder block cooled by water spraying is fitted.
作者
高亮
韦海彬
沈建增
陈嘉俊
GAO Liang;WEI Haibin;SHEN Jianzeng;CHEN Jiajun(School of Management Engineering,Shandong Jianzhu University,Jinan 250101,China;College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;School of Civil Engineering and Architecture,Nanning University,Nanning 541699,China)
出处
《新型建筑材料》
2023年第3期7-11,共5页
New Building Materials
基金
山东建筑大学博士科研基金项目(X21009Z)。
关键词
高温
机制砂混凝土
喷水冷却
抗压强度
high temperature
machine-made sand concrete
water spraying cooling
compressive strength
