Advances in concrete construction

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Mechanical properties of steel-polypropylene fiber reinforced fully recycled coarse aggregate concrete

  • Weiwei Su (College of Civil Engineering and Architecture, Guangxi University) ;
  • Zongping Chen (College of Civil Engineering and Architecture, Guangxi University) ;
  • Haoyu Liao (College of Civil Engineering and Architecture, Guangxi University) ;
  • Dingyuan Liu (Civil Engineering Department, Guangxi Technological College of Machinery and Electricity) ;
  • Xingyu Zhou (College of Civil Engineering and Architecture, Guangxi University)
  • Received : 2021.09.27
  • Accepted : 2023.11.07
  • Published : 2023.09.25
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Abstract

In this study, the steel fiber and the polypropylene fiber were used to enhance the mechanical properties of fully recycled coarse aggregate concrete. Natural crushed stone was replaced with recycled coarse aggregate at 100% by volume. The steel fiber and polypropylene fiber were used as additive material by incorporating into the mixture. In this test two parameters were considered: (a) steel fiber volume ratio (i.e., 0%, 1%, 1.5%, 2%), (b) polypropylene fiber volume ratio (i.e., 0%, 0.1%, 0.15%, 0.2%). The results showed that compared with no fiber, the integrity of cubes or cylinders mixed with fibers after failure was better. When the volume ratio of steel fiber was 1~2%, the width of mid-span crack after flexural failure was 5~8 mm. In addition, when the volume ratio of polypropylene fiber was 0.15%, with the increase of steel fiber content, the static elastic modulus and toughness of axial compression first increased and then decreased, and the flexural strength increased, with a range of 6.5%~20.3%. Besides, when the volume ratio of steel fiber was 1.5%, with the increase of polypropylene fiber content, the static elastic modulus decreased, with a range of 7.0%~10.5%. The ratio of axial compression toughness first increased and then decreased, with a range of 2.2%~8.7%. The flexural strength decreased, with a range of 2.7%~12.6%. On the other hand, the calculation formula of static elastic modulus and cube compressive strength of fully recycled coarse aggregate with steel-polypropylene fiber was fitted, and the optimal fiber content within the scope of the test were put forward.

Keywords

Acknowledgement

The authors acknowledge the financial support from National Natural Science Foundation (NSFC) of PR China (No. 51578163) and The Central Government to Guide Local Scientific and Technological Development (Guike ZY21195010). They would also like to thank for Guangxi Science and Technology Base and Talent Special Project (AD21075031) and the counterpart aid project for discipline construction from Guangxi University (Grant No. 2023N01).

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