Effect of Shape and Content of Steel Fiber on Workability and Mechanical Properties of Ultra-High Performance Concrete
NIE Jie1,2, LI Chuanxi1, QIAN Guoping2, PAN Rensheng1, PEI Bida1, DENG Shuai1
1 Key Laboratory of Green Construction and Maintenance of Bridges and Buildings in Hunan Province, Changsha University of Science and Technology, Changsha 410114, China 2 School of Traffic and Transportation Engineering, Changsha University of Science and Technology, Changsha 410114, China
Abstract: The effects of steel fiber volume content, length-diameter ratio, shape, homogeneous fiber blending and deformed fiber blending on the workability and mechanical properties of ultra-high performance concrete (UHPC) were investigated by using four kinds of straight steel fibers and two kinds of end hook steel fibers. The slump extension, compressive strength, flexural strength, energy absorption, fracture energy and flexural stress-deflection curves of UHPC were obtained. The flexural toughness index of UHPC were calculated according to the flexural stress-deflection curves and the improved standard method. Finally, the study of the optimal fiber blending ratio was carried out. The results show that for every 0.5% increase in fiber content, the average decrease of slump extension of UHPC is 2.72%, and the average increase of compressive strength is 5.79%. The flexural strength, flexural toughness index and energy absorption increase first and then decreases (the critical fiber content is 3.5% ), and the fracture energy fluctuates up and down(the fiber volume content is 3% at the lowest fracture energy). With the increase of fiber length-diameter ratio, the slump extension of UHPC decrease, while the compressive strength, flexural strength, flexural toughness index, energy absorption and fracture energy value increase gradually. At the same length-diameter ratio, the slump extension and flexural toughness index of UHPC with end hook fibers are better than those of straight fibers, while the compressive strength, flexural strength, energy absorption and fracture energy of end hook fibers are lower than those of straight fibers. The slump extension and compressive strength of UHPC with homogeneous fiber blending are slightly lower than those of the corresponding single-blended fibers, and the flexural toughness, energy absorption and fracture energy are generally better than those of the single-blended specimens. The slump extension and compressive strength of UHPC with deformed fiber blending are slightly lower than those of single-blended specimens, the flexural strength increases and decreases with that of single-blended specimens, and the flexural toughness, energy absorption and fracture energy are almost better. The flexural strength variability of UHPC is higher than its compressive strength. The optimum compressive and flexural strength of all UHPC specimens are 173.53 MPa, 44.9 MPa(single fibers) and 160.9 MPa, 55.72 MPa(mixed fibers). The optimum blending combination of fibers is 18 mm straight fiber and 16 mm end hook fiber, and the strength, flexural toughness and energy absorption of UHPC are all better when the fiber blending ratio is 1∶1.
聂洁, 李传习, 钱国平, 潘仁胜, 裴必达, 邓帅. 钢纤维形状与掺量对UHPC施工及力学特性的影响[J]. 材料导报, 2021, 35(4): 4042-4052.
NIE Jie, LI Chuanxi, QIAN Guoping, PAN Rensheng, PEI Bida, DENG Shuai. Effect of Shape and Content of Steel Fiber on Workability and Mechanical Properties of Ultra-High Performance Concrete. Materials Reports, 2021, 35(4): 4042-4052.
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2021, Vol. 35 
