钢纤维自应力混凝土膨胀变形的长期性能研究.pdfVIP

第 12 巷第 5 期 建筑材料学报 Vo 1.l2 , No.5 2009 年 10 月 JOURNAL OF BUILDING MA丁ERIALS Oct. ,2009 文章编号:1007伽9629(2009)05-0595-04 钢纤维自应力混凝土膨胀变形的长期性能研究 何化南1 ，秦杰2 ，黄承追1 (1.大连理工大学梅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) 摘襄z 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制贵.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校低， 能够满足结构设计所要求的自应力水平.问时，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. 关键询:长期变形;膨胀p 自应力;钢纤维p 混凝土 中圄分费号:TU528. 571; TU528. 572 立献棉识码:A Research on Long-Term Expansive Deformation of Steel Fiber Reinforced Self-stressing Concrete HE Hua-nan 1 , QIN lie2 , HUANG Cheng-kui 1 (1. State Key Laboratory of C心astal and Offshore Engineering , Dalian Universíty of Technology , Dalian 116024 , China; 2. Beijing Buílding Construction Research Instítute , Beijing 100039 , China) Abstract: Steel fiber reinforced self-stressing concrete is a sort of high performance concrete with high ten- sile 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. 丁he test results show that after one year the restrained expansive deformations of concrete specimens remain to be 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 struc- tures. In addition , the exponent