摘要
混凝土建筑经历火灾后会受到极大破坏,为提高火灾后建筑结构的稳定性,提出一种适用于高温环境的新型混凝土——钢纤维陶瓷骨料混凝土。对高温后天然碎石混凝土和钢纤维陶瓷骨料混凝土进行2种不同加载率的静态劈拉力学试验,对比2种混凝土的劈拉强度和破坏形态。结果表明:高温后天然碎石混凝土的劈拉破坏形态为断裂破坏,而钢纤维陶瓷骨料混凝土的劈拉破坏形态为裂而不开;2种混凝土存在明显的力加载率效应,混凝土的劈拉强度随着加载率的增大而提高;经历1000℃高温后,天然碎石混凝土直接破坏,丧失承载力,而钢纤维陶瓷骨料混凝土还保留常温下劈拉强度的28%,具有较好的耐高温性能。
Concrete buildings will be greatly damaged after fire.In order to improve the stability of building structures after fire,a new type of concrete suitable for high temperature environment is put forward:steel fiber ceramic aggregate concrete.The static splitting tensile tests of natural crushed stone concrete and steel fiber ceramic aggregate concrete were carried out at two different loading rates to compare the splitting tensile strength and failure modes of the two kinds of concrete.The results show that the breakage mode of natural crushed stone concrete specimens is fracture,while the breakage mode of steel fiber ceramic aggregate concrete specimens is crack without opening.The two kinds of concrete specimens have obvious effect of force loading rate,and the tensile strength of specimens increases with the increase of force loading rate.After undergo high temperature of 1000℃,natural crushed stone concrete damaged directly and lost bearing capacity,while steel fiber ceramic aggregate concrete specimens still retain 28%of the tensile strength of specimens at normal temperature,which reflects its better high temperature resistance.
作者
田帅帅
陶俊林
TIAN Shuaishuai;TAO Junlin(Southwest University of Science and Technology,Mianyang 621010,China)
出处
《新型建筑材料》
2023年第3期1-6,共6页
New Building Materials
基金
四川省科技厅项目(20zs2108)。
关键词
陶瓷骨料
钢纤维
铝酸盐水泥:高温
劈拉强度
ceramic aggregate
steel fiber
aluminate cement
high temperature
splitting tensile strength
