火灾后混凝土结构耐久性的若干研究  

SEVERAL RESEARCHES ON DURABILITY OF POST-FIRE CONCRETE STRUCTURES

作　　者：张奕[1] 金伟良[1] 

机构地区：[1]浙江大学结构工程研究所,杭州310027

出　　处：《工业建筑》2005年第8期93-96,共4页Industrial Construction

摘　　要：火灾对混凝土结构的安全性和适用性带来了严重的危害,而对其耐久性造成的危害同样不可忽视。由于火灾的高温和含氯烟雾作用,混凝土结构存在严重氯离子侵蚀问题。火灾的高温导致混凝土结构碳化,同时,火灾后的混凝土结构也存在着硫酸盐侵蚀等其他一些比较常见的耐久性问题。火灾对混凝土结构耐久性诸多影响的作用机理有别于通常状况,在深入研究火灾影响混凝土结构耐久性各种因素的作用机制的基础上,提出利用特殊的氯离子扩散模型来评估火灾后混凝土结构抵抗氯离子侵蚀耐久性能;引入混凝土结构内部温度场分布理论来评估火灾后混凝土结构碳化剩余寿命。Fire hazard does have great harm to the safety and suitability of concrete structures. But in fact, fire also weakens the durability of concrete significantly. Serious problems of chloride ions erosion have been found in the post-fire concrete structures because of the high temperature and the smoke full of chloride ions. Fire also aggravates the carbonation of concrete. There are other common factors that influence the durability of the post-fire concrete as well, such as sulphate erosion. However,the mechanism of the impression that fire acts on the durability of concrete is different from common one. So, several problems of the durability of post-fire concrete structures have been studied. The mechanisms of impression due to chloride ions and carbonation at high temperature are presented. The prediction of service life of concrete structure is considered as well. Those have shown that the action of fire on concrete structures is one of important research contents of durability of concrete structures.

关 键 词：火灾 混凝土结构 氯离子 温度场 中性化 硫化物 结构耐久性 火灾后 氯离子侵蚀 硫酸盐侵蚀 

分 类 号：TU375[建筑科学—结构工程] TU37