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<p>Coal gangue concrete (CGC) offers an effective solution to the large-scale accumulation of coal gangue waste, and the enhancement of its mechanical properties through modification has been extensively studied. This study explored the effects of varying volumes of nano-SiO₂ (NS), polyvinyl alcohol (PVA) fibers, and different substitution rates of coal gangue coarse aggregate (CGCA) on the mechanical properties of concrete. The microstructural mechanisms of NS- and PVA fiber-modified CGC were analyzed using scanning electron microscopy (SEM). The results revealed that the optimal volume contents of NS and PVA fibers were 2% and 0.2%, respectively, and that substitution rates of CGCA within 40% had minimal impact on the concrete. SEM analysis showed that PVA fibers help prevent crack formation by creating a bridging effect, while NS induces a volcanic ash reaction and a filling effect, promoting the formation of calcium silicate hydrate gel and filling pores. Furthermore, the stress–strain curve obtained from the tests was fitted using Guo’s model, with the fitting result showing good.</p>

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Research on the Mechanical Properties and Microstructure of Coal Gangue Concrete Reinforced of Nano-SiO2 and Polyvinyl Alcohol Fibers

  • 期刊论文

  • 发表日期：

    2025年5月28日

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  • Lei Wang,
  • Huaxin Liu,
  • Genjin Liu,
  • Chenchen Xu

摘要

Coal gangue concrete (CGC) offers an effective solution to the large-scale accumulation of coal gangue waste, and the enhancement of its mechanical properties through modification has been extensively studied. This study explored the effects of varying volumes of nano-SiO₂ (NS), polyvinyl alcohol (PVA) fibers, and different substitution rates of coal gangue coarse aggregate (CGCA) on the mechanical properties of concrete. The microstructural mechanisms of NS- and PVA fiber-modified CGC were analyzed using scanning electron microscopy (SEM). The results revealed that the optimal volume contents of NS and PVA fibers were 2% and 0.2%, respectively, and that substitution rates of CGCA within 40% had minimal impact on the concrete. SEM analysis showed that PVA fibers help prevent crack formation by creating a bridging effect, while NS induces a volcanic ash reaction and a filling effect, promoting the formation of calcium silicate hydrate gel and filling pores. Furthermore, the stress–strain curve obtained from the tests was fitted using Guo’s model, with the fitting result showing good.