Advances in concrete construction

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Toughness and microscopic pore structure analysis of pasture fiber recycled concrete

  • Hailong Wang (College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University) ;
  • Lei Wang (College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University) ;
  • Hong Yang (College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University)
  • Received : 2021.11.10
  • Accepted : 2023.11.15
  • Published : 2023.09.25
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Abstract

In order to develop and take full advantage of pasture fiber and waste concrete, this article studied how different amounts of pasture fiber influenced the toughness and pore structure of concrete with different replacement rates of recycled fine aggregate. Pasture fiber recycled concrete constitutive equations were established under idealized stiffness and toughness damage rate, based on fracture energy and damage mechanics theories. The relationship between pore structure and toughness was studied utilizing nuclear magnetic resonance and fractal theory. The toughness of text groups (0% (JZ), 10% (ZS10), 20% (ZS20)) first increased and then decreased with increasing amounts of pasture fiber, based on the damage rate of toughness. The toughness of concrete samples with recycled fine aggregate and pasture fiber is negatively correlated to the fractal dimension of small and medium-sized pores with a pore size of 0-500 nm. At a replacement rate of 10% of the recycled fine aggregate, the fractal dimension of the air voids (r: 500-9000 nm, i.e., Lg(r) ∈ [2.7, 3.9]) shows a gradual decrease with the increase of grass fiber dosage, indicating that with such a replacement rate of the recycled fine aggregate, the increase of pasture fiber can reduce the complexity of the pore structure of the air voids (500-9000 nm).

Keywords

Acknowledgement

The authors gratefully acknowledge the financial support of this work provided by the National Natural Science Foundation of China (Grant No.52069024) and Technology Projects of Inner Mongolia Autonomous Region of China (Grant no. 2021ZD0007).

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