Structural Engineering and Mechanics

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Pseudo-strain hardening and mechanical properties of green cementitious composites containing polypropylene fibers

  • Karimpour, Hossein (Department of Civil Engineering, Shahid Rajaee Teacher Training University) ;
  • Mazloom, Moosa (Department of Civil Engineering, Shahid Rajaee Teacher Training University)
  • Received : 2021.03.04
  • Accepted : 2021.12.07
  • Published : 2022.03.10
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Abstract

In order to enhance the greenness in the strain-hardening composites and to reduce the high cost of typical polyvinyl alcohol fiber reinforced engineered cementitious composite (PVA-ECC), an affordable strain-hardening composite with green binder content has been proposed. For optimizing the strain-hardening behavior of cementitious composites, this paper investigates the effects of polypropylene fibers on the first cracking strength, fracture properties, and micromechanical parameters of cementitious composites. For this purpose, digital image correlation (DIC) technique was utilized to monitor crack propagation. In addition, to have an in-depth understanding of fiber/matrix interaction, scanning electron microscope (SEM) analysis was used. To understand the effect of fibers on the strain hardening behavior of cementitious composites, ten mixes were designed with the variables of fiber length and volume. To investigate the micromechanical parameters from fracture tests on notched beam specimens, a novel technique has been suggested. In this regard, mechanical and fracture tests were carried out, and the results have been discussed utilizing both fracture and micromechanical concepts. This study shows that the fiber length and volume have optimal values; therefore, using fibers without considering the optimal values has negative effects on the strain-hardening behavior of cementitious composites.

Keywords

References

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