钢纤维自应力混凝土膨胀变形的长期性能研究  

Research on Long-Term Expansive Deformation of Steel Fiber Reinforced Self-stressing Concrete

作　　者：何化南[1] 秦杰[2] 黄承逵[1] 

机构地区：[1]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024 [2]北京市建筑工程研究院,北京100039

出　　处：《建筑材料学报》2009年第5期595-598,共4页Journal of Building Materials

基　　金：国家自然科学基金资助项目(59879001)

摘　　要：对不同限制程度下钢纤维自应力混凝土的膨胀变形进行了测量.结果表明:钢纤维自应力混凝土365 d的膨胀变形变化很小,基本上与28 d的膨胀变形持平,也就是说自应力损失程度较低,能够满足结构设计所要求的自应力水平.同时,提出了限制变形与钢筋配筋率的指数关系以及钢筋与钢纤维共同作用时自应力混凝土的变形规律.Steel fiber reinforced self-stressing concrete is a sort of high performance concrete with high tensile strength. For this concrete a stable self-stress level as well as long-term expansive deformation is key factors to ensure high performance and safety of concrete structures. A series of test were carried out to measure restrained expansive deformations of steel fiber reinforced self-stressing concrete under combined restriction of steel fiber and steel bar. The test results show that after one year the restrained expansive deformations of concrete specimens remain to he in original level（28 days）. Hence loss of self-stress is slight so that the concrete is able to meet the requirements of designed self-stress level for concrete structures. In addition, the exponential relation between steel reinforcing ratio and restrained expansive deformation is proposed.

关 键 词：长期变形 膨胀 自应力 钢纤维 混凝土 

分 类 号：TU528.571[建筑科学—建筑技术科学] TU528.572