DUCTILITY AND DURABILITY ENHANCEMENT IN STEEL REINFORCED MEMBERS THROUGH INTRODUCTION OF UHTCC WITH STRAIN-HARDENING TENSION CHARACTERISTIC
Low ductility and wide cracks behaved in concrete material present severechallenges to long term service of concrete structures. This paper provides a new solution tothese issues by introducing UHTCC material,which is a kind of new random-oriented shortPVA fiber reinforced cementitous composites and exhibits ultra-high toughness of up to 3％ultimate tension strain capacity under uniaxial tensile load accompanying with formation ofmultiple fine micro-cracks with merely 80μm average crack width even at ultimate tensionstrain time. Using UHTCC to fully replace concrete matrix,two groups of 6 steel reinforcedUHTCC beams with different reinforcement ratios were tested in four-point bending loading.For comparison purposes,corresponding ordinary steel reinforced concrete beams wereprepared. The results indicate that,compared to ordinary steel reinforced concrete beams,RUHTCC beams not only could delay steel yielding and eventually improve structure flexuralcapacity and ductility,but also could dramatically reduce crack width down to within 0.1 mmat yielding,leading to significantly enhanced durability.
ductility crack test beam UHTCC
Zhang Xiufang Xu Shilang
Departmental of Civil Engineering,Dalian University of Technology,Dalian 116024,PR China
国际会议
The International Conference on Durability of Concrete Structures(2008年混凝土结构耐久性国际学术会议)
杭州
英文
921-929
2008-11-01（万方平台首次上网日期，不代表论文的发表时间）