Advances in concrete construction

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Mechanical behavior and chloride resistance of cementitious composites with PE and steel fiber

  • Liao, Qiao (College of Civil Engineering, Tongji University) ;
  • Guo, Zhen-wen (Shanghai Municipal Planning and Design Institute Co., Ltd.) ;
  • Duan, Xin-zhi (Shanghai Municipal Planning and Design Institute Co., Ltd.) ;
  • Yu, Jiang-tao (College of Civil Engineering, Tongji University) ;
  • Liu, Ke-ke (Shanghai Municipal Planning and Design Institute Co., Ltd.) ;
  • Dong, Fang-yuan (Shanghai Municipal Planning and Design Institute Co., Ltd.)
  • Received : 2020.03.28
  • Accepted : 2021.11.02
  • Published : 2021.12.25
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Abstract

The mechanical behaviors and chloride resistance performance of fiber reinforced cementitious composites (FRCC) with hybrid polyethylene (PE) and steel fiber (in total 2% by volume) were investigated. Based on micro-mechanics and fracture mechanics, the reason why the tensile strain capacity of FRCC changed obviously was obtained. Besides, the effects of the total surface area of fiber in FRCC on compressive strength and chloride content were clarified. It is found that the improvement of the tensile strain capacity of FRCC with hybrid fiber is attributed to the growth of strain-hardening performance index (the ratio of complementary energy to crack tip toughness). As the total surface area of fiber related with the interfacial transition zone (ITZ) between fiber and matrix increases, compressive strength decreases obviously. Since the total surface area of fiber is small, the chloride resistance performance of FRCC with hybrid PE and steel fiber is better than that of FRCC containing only PE fiber.

Keywords

Acknowledgement

The authors wish to acknowledge the National Natural Science Foundation of China (Nos. 51478362, 51778461). And this research is funded (No. 2016-KF08) by Shanghai City Housing and Urban Construction Management Committee, Shanghai, China.

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