二次钙矾石形成和膨胀混凝土的耐久性  

Secondary Ettringite Formation and Durability of Expansive Concrete

作　　者：席耀忠[1] 

机构地区：[1]中国建筑材料科学研究院,北京100024

出　　处：《混凝土与水泥制品》2003年第2期5-9,共5页China Concrete and Cement Products

基　　金：国家重点基础理论发展规划项目 (2001CB610700)

摘　　要：阐述二次钙矾石形成(SEF)的条件、机理和影响因素 ,并对实际混凝土中的SEF破坏进行了分析。作者认为 ,二次钙矾石形成是否造成破坏与混凝土体系健康状况与所处环境有关 ,不能独立于外荷载作用、碱集料反应、冻融循环、冷热交替和干湿循环所造成的混凝土质变之外。从总体看 ,二次钙矾石形成不是混凝土破坏的主导因素。在健康混凝土中 ,少量二次钙矾石形成对混凝土有增强、密实和补偿收缩的作用 ;对于劣化混凝土或病害混凝土 。The conditions, mechanism and influential factors for secondry ettringite formation(SEF) have been described, and analysis has been down for the failure of pratical concrete by SEF. The author considers that whether the destroying of concrete is formed? it is related to the conditions of health and environment of concrete and can not be independent out of the deterioration formed by exterior loads, alkali-aggregate reaction, freezing and thqwing cycling, cold and hot alternating, dry and wet cycling. Generally, the SEF is not the dominant factor for concrete failure. In the healthy concrete a small amount of SEF plays a role in strengthening , compacting and shrinkage compensating of concrete. However, for the detoriorated concrete and defective concrete, SEF will accelerate the destroying.

关 键 词：膨胀混凝土 耐久性 二次钙矾石 荷载 碱集料反应 冻融循环 

分 类 号：TU528.55[建筑科学—建筑技术科学]