Computers and Concrete

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Mechanical behaviors of concrete combined with steel and synthetic macro-fibers

  • Deng, Zongcai (School of Civil and Architecture Engineering, Beijing University of Technology) ;
  • Li, Jianhui (School of Civil and Architecture Engineering, Beijing University of Technology)
  • Received : 2007.02.22
  • Accepted : 2007.07.02
  • Published : 2007.06.25
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Abstract

In this paper, hybrid fibers including high elastic modulus steel fiber and low elastic modulus synthetic macro-fiber (HPP) as two elements were used as reinforcement materials in concrete. The flexural toughness, flexural impact and fracture performance of the composites were investigated systematically. Flexural impact strength was analyzed with statistic analyses method; based on ASTM and JSCE method, an improved flexural toughness evaluating method suitable for concrete with synthetic macro-fiber was proposed herein. The experimental results showed that when the total fiber volume fractions ($V_f^a$) were kept as a constant ($V_f^a=1.5%$), compared with single type of steel or HPP fibers, hybrid fibers can significantly improve the toughness, flexural impact life and fracture properties of concrete. Relative residual strength RSI', impact ductile index ${\lambda}$ and fracture energy $G_F$ of concrete combined with hybrid fibers were respectively 66-80%, 5-12 and 121-137 N/m, which indicated that the synergistic effects (or combined effects) between steel fiber and synthetic macro-fiber were good.

Keywords

References

  1. ACI committee 544 (1988), "Measurement of properties of fiber reinforced concrete", ACI Mater. J., 85(6), 583-593.
  2. ASTM C1018 (1991), "Standard test method for flexural toughness and first crack strength of fiber reinforced concrete", Book of ASTM Standard.
  3. ASTM C1399-98 (1998), "Test method for obtaining average residual strength of fiber reinforced concrete", Annual Book of ASTM Standards.
  4. CECS 38 (China Civil Engineering Institute Code) (2004), "Technical specification for fiber reinforced concrete structures", China Planning Press.
  5. Chen, Bing and Liu Juanyu (2005), "Contribution of hybrid fibers on the properties of the high-strength lightweight concrete having good workability", Cement Concrete Res., 35, 913-917. https://doi.org/10.1016/j.cemconres.2004.07.035
  6. Chen, Bing and Liu, Juanyu (2004), "Residual strength of hybrid-fiber-reinforced high-strength concrete after exposure to high temperatures", Cement Concrete Res., 34, 1065-1069. https://doi.org/10.1016/j.cemconres.2003.11.010
  7. Hancox, N. L. (1981), Fiber composite hybrid materials, Applied Science Publishers Ltd, London.
  8. JSCE-SF4 (1984), "Method of test for flexural strength and flexural toughness of steel fiber reinforced concrete", Concrete Library of JSCE.
  9. Li, Jianhui and Deng, Zongcai (2005), "Interfacial bond property between HPP fiber and mortar", China Cement Concrete Products, 142, 38-40.
  10. Qian, C. X. and Stroeven, P. (2000), "Development of hybrid polypropylene-steel fiber-reinforced concrete", Cement Concrete Res., 30, 63-69. https://doi.org/10.1016/S0008-8846(99)00202-1
  11. RILEM Committee 50-FMC (1985), "Determination of the fracture energy of mortar and concrete by means of three-points bend test no notched beams", Mater. Struct. Res. Testing (RILEM, Paris), 18, 285-290. https://doi.org/10.1007/BF02472917
  12. Shah, S. P. (1990), "Determination of fracture parameters of plain concrete using three-point bend tests", Mater. Struct. 23, 457-460. https://doi.org/10.1007/BF02472029
  13. Song, P. S., Wu, J. C., Wang, S. H., and Sheu, B. C. (2005), "Statistical analysis of impact strength and strength reliability of steel-polypropylene hybrid fiber-reinforced concrete", Constr. Build. Mater., 19, 1-9. https://doi.org/10.1016/j.conbuildmat.2004.05.002
  14. Sun, Wei, Chen, Huisu, Luo, Xin and Qian, Hongpin (2003), "The effect of hybrid and expansive agent on the shrinkage and permeability of high-performance concrete", Cement Concrete Res., 31, 595-601.
  15. Yao, Wu, Li, Jie and Wu, Keru (2003). "Mechanical properties of hybrid fiber-reinforced concrete at low fiber volume fraction", Cement Concrete Res., 33, 27-31. https://doi.org/10.1016/S0008-8846(02)00913-4

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