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<p>As a product of recycling and reusing construction waste, recycled coarse aggregate not only effectively alleviates the shortage of natural aggregate resources, but also reduces the environmental pollution caused by construction waste. To systematically analyze the influence of slurry containing recycled aggregates on the mechanical properties and frost resistance of recycled concrete, a study was conducted on the slurry treatment of recycled coarse aggregate using ordinary Portland cement, silica powder, and sulfoaluminate cement, and the mixing ratio of concrete was constructed. Meanwhile, the calculation methods for the mechanical and frost resistance indicators of concrete are explained. The results showed that the average maximum values of compressive strength within the recycled concrete group at 3&#xa0;d, 7&#xa0;d, and 28&#xa0;d were 41.87&#xa0;MPa, 48.73&#xa0;MPa, and 55.15&#xa0;MPa, respectively. As the number of freeze–thaw cycles increased, the relative dynamic modulus of the test block gradually decreased. In summary, grouting treatment can optimize the mechanical and freeze–thaw resistance properties of recycled concrete. This research result can provide technical support for the reuse of construction waste.</p>

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Influence of recycled coarse aggregate for grouting on the mechanical properties and frost resistance of concrete

  • 期刊论文

  • 发表日期：

    2025年9月8日

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  • Mengting Fan,
  • Xuan Wang

摘要

As a product of recycling and reusing construction waste, recycled coarse aggregate not only effectively alleviates the shortage of natural aggregate resources, but also reduces the environmental pollution caused by construction waste. To systematically analyze the influence of slurry containing recycled aggregates on the mechanical properties and frost resistance of recycled concrete, a study was conducted on the slurry treatment of recycled coarse aggregate using ordinary Portland cement, silica powder, and sulfoaluminate cement, and the mixing ratio of concrete was constructed. Meanwhile, the calculation methods for the mechanical and frost resistance indicators of concrete are explained. The results showed that the average maximum values of compressive strength within the recycled concrete group at 3 d, 7 d, and 28 d were 41.87 MPa, 48.73 MPa, and 55.15 MPa, respectively. As the number of freeze–thaw cycles increased, the relative dynamic modulus of the test block gradually decreased. In summary, grouting treatment can optimize the mechanical and freeze–thaw resistance properties of recycled concrete. This research result can provide technical support for the reuse of construction waste.