摘要
为保护钢筋混凝土结构不因受到高温影响使结构急剧丧失承载能力而倒塌,常采用增加灰浆层的办法。钢筋在混凝土与灰浆层保护层的包裹之内,可以缓解温度急剧上升。但典型灰浆层对钢筋混凝土的耐火极限的报道还不多。本文针对灰浆层对钢筋混凝土的耐火极限影响进行了试验研究。比较了增加灰浆层与不加抹灰层在耐火极限、烧损面、残余强度等方面的变化,讨论了灰浆层对结构防火的贡献。结果证明:钢筋在混凝土在灰浆层保护层的包裹之内,可以缓解温度急剧上升,保护层使建筑物有一定的耐火作用;增加钢筋混凝土结构构件的保护层厚度能够有效提高构件的耐火极限;混凝土砂浆保护层直接关系到混凝土结构的承载力,直接关系到混凝土结构的耐久性与耐火性。
To prevent reinforced concrete structure rapidly destroyed and broken down by fire,the slurry layer is usually used on the surfaced of reinforced concrete to protect the concrete structure,so that temperature of reinforcing steel bar packaged in concrete can not be suddenly increased.The report about the limited fire-endurance time of reinforced concrete with slurry layer is a little showed before.This paper is aimed at change of limited fire-endurance time of reinforced concrete with slurry layer.It is compared the change of fire-endurance time,burning loss area and intensity remains of reinforced concrete with slurry layer or no.It is conclusion that the reinforcing steel bar in reinforced concrete is tight wrapped by the slurry layer,so that its temperature will not be obviously increased under fire.On the other words,the slurry layer will enhance the fire-endurance time of reinforced concrete,resulting in enhancing of the stated fire-resistance performance of the building.And,increasing the thickness of slurry layer of reinforced concrete can remarkably improve its limited fire-endurance time.In other words,the quality of slurry layer of reinforced concrete is closely related with the carrying capacity of the concrete construction,and nearly results in a well wear-resistance and fire-resistance performance
出处
《中国安全生产科学技术》
CAS
北大核心
2010年第2期56-60,共5页
Journal of Safety Science and Technology
基金
公安部消防局重点项目资助
关键词
灰浆层
钢筋混凝土楼板
耐火极限
slurry layer
reinforced concrete
fire-endurance time
