Advances in concrete construction

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Research on basic mechanical properties and damage mechanism analysis of BFUFARC

  • Yu H. Yang (School of Materials Science and Engineering, School of Architecture and Civil Engineering, Shenyang University of Technology) ;
  • Sheng J. Jin (School of Materials Science and Engineering, School of Architecture and Civil Engineering, Shenyang University of Technology) ;
  • Chang C. Shi (School of Materials Science and Engineering, School of Architecture and Civil Engineering, Shenyang University of Technology) ;
  • Wen P. Ma (School of Materials Science and Engineering, School of Architecture and Civil Engineering, Shenyang University of Technology) ;
  • Jia K. Zhao (School of Civil Engineering, Inner Mongolia University of Science and Technology)
  • Received : 2024.01.13
  • Accepted : 2024.05.31
  • Published : 2023.12.25
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Abstract

In order to study the mechanical properties of basalt fiber reinforced ultra-fine fly ash concrete (BFUFARC), the effects of ultra-fine fly ash (UFA) content, basalt fiber content, basalt fiber length and water reducing agent content on the compressive strength, splitting tensile strength and flexural strength of the composite material were studied through experimental and theoretical analysis. Also, a scanning electron microscope (SEM) was employed to analyze the mesoscopic structure in the fracture surface of composite material specimens at magnifications of 500 and 3500. Besides, the energy release rate (Gc) and surface free energy (γs) of crack tip cracking on BFUFARC in different basalt fiber content were studied from the perspective of fracture mechanics. Further, the cracking resistance, reinforcement, and toughening mechanisms of basalt fibers on concrete substrate were revealed by surface free energy of BFUFARC. The experimental results indicated that basalt fiber content is the main influence factor on the splitting tensile strength of BFUFARC. In case that fiber content increased from 0 to 0.3%, the concrete surface free energy at the tip of single-sided crack showed a trend of increased at first and then decreased. The surface free energy reached at maximum, about 3.59 × 10-5 MN/m. During the process of increasing fiber content from 0 to 0.1%, GC-2γS showed a gradually decreasing trend. As a result, an appropriate amount of basalt fiber can play a preventing cracking role by increasing the concrete surface free energy, further effectively improve the concrete splitting tensile performance.

Keywords

Acknowledgement

This work was supported by International Natural Science Foundation (Grant No: 51279123) and Key Science and Technology Research Projects of Liaoning Provincial Department of Education (Grant No: LJKZZ20220025). Also, this work is carried out by Sheng-ji Jin, Yu-hao Yang, Chang-chun Shi, Wen-peng Ma and Jia-kang Zhao.

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