EXPERIMENTAL STUDY ON IMPROVING SUPER HIGH-STRENGTH CONCRETE TOUGHNESS BY STEEL FIBER
The significant brittleness with low tensile strength of super high-strength concrete (above C100) restricted its application in seismic region. In order to overcome this problem, a series of experimental studies were performed by adding the steel fibers into super high-strength concrete. When the steel fibers were added at the volume fractions of 0.5％, 0.75％, 1.0％ and 1.5％, the compression strength increased slightly, only being 10.6％～15.5％ improvements. But the splitting tensile strength increased greatly, being 38.2％～91.9％ improvements. Steel fibers were also added to super high-strength concrete columns in three different percentages of 0.5％, 1.0％, and 1.5％ by volume of concrete in order to study seismic toughness. Compared with plain super high-concrete column, the ultimate displacements and total energy dissipations of steel fiber columns had 8.5％～93.6％, 146.2％～767.5％ improvements, respectively. The test results indicated that adding steel fiber into super high-strength concrete can reduce the brittleness and better the toughness greatly, and the applications of super high-strength concrete columns in seismic regions may be relaxed.
super high-strength concrete steel fiber compression strength splitting tensile strength toughness
Rui JIANG
Key Laboratory of Geotechnical Engineering,Ludong University China
国际会议
The 3rd International Conference on The Concrete Future(第三届混凝土未来国际会议)
烟台
英文
245-250
2008-10-17（万方平台首次上网日期，不代表论文的发表时间）