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Advances in Concrete Construction Volume 16, Number 3, September 2023 , pages 141-153 DOI: https://doi.org/10.12989/acc.2023.16.3.141 |
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Toughness and microscopic pore structure analysis of pasture fiber recycled concrete |
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Hailong Wang, Lei Wang and Hong Yang
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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). | ||
| Key Words | ||
| damage constitutive equation; fractal dimension; nuclear magnetic resonance; pasture fiber; recycled fine aggregate; toughness | ||
| Address | ||
| College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, 306 Zhaowuda Road, Hohhot, Inner Mongolia, 010018, China. | ||
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