钢纤维形状与掺量对UHPC施工及力学特性的影响

doi:10.11896/cldb.20030125

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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.

Key words： UHPC mechanical properties steel fiber volume content fiber length-diameter ratio blending of the same shape steel fiber and the special shape steel fiber flexural toughness index

Published: 23 February 2021

CLC number:

U444

Fund:This work was financially supported by the National Natural Science Foundation of China(51778069, 52078059),973 Project(2015CB057700),Hunan Postgraduate Research Innovation Project(CX2016B386),the Open Fund of National Joint Engineering Research Laboratory for Long-term Performance Improvement Technology for Bridges in Southern China(CSUST)(16BCX01).

Corresponding Authors: lichuanxi2@163.com

About author:: Jie Nie is a Ph.D. postgraduate in bridge and tunnel, School of Civil Engineering, Changsha University of Science and Technology. His major research direction is the preparation and mechanical properties of ultra-high performance concrete(UHPC).
Chuanxi Li, born in September 1963 in Hengyang, Hunan Province. He is currently a doctor of enginee-ring, professor, doctoral supervisor enjoying the special allowance from the State Council, and the dean of School of Civil Engineering of Changsha University of Science and Technology. At the same time, he is a national candidates for millions of talents project in the new century, transportation, science and technology talents, the first-level candidate of the “121 Talent Project” in Hunan province, and the academic leader of the “New Technology, New Materials, New Process of Bridge Engineering” research direction for the
bridge and tunnel engineering of Changsha University of Science and Techno-logy. He is also the lead researcher of “973” project, and he has presided over more than 20 provincial and ministerial-level and national-level research projects including 4 Natural Science Foundation of China, and presided over the construction control and research work of nearly 40 super-large bridges. He has won 2 second prizes for national scientific and technological progress, 4 first prizes for provincial and ministerial scientific and technological progress, 3 monographs, more than 200 papers published in academic journals at home and abroad, more than 10 invention patents and 3 software copyrights, and more than 100 master's and doctor's degree supervisors.

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Cite this article:

NIE Jie,LI Chuanxi,QIAN Guoping, et al. Effect of Shape and Content of Steel Fiber on Workability and Mechanical Properties of Ultra-High Performance Concrete[J]. Materials Reports, 2021, 35(4): 4042-4052.

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http://www.mater-rep.com/EN/10.11896/cldb.20030125 OR http://www.mater-rep.com/EN/Y2021/V35/I4/4042

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