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<p>This study introduces superabsorbent polymers (SAP) into recycled concrete and, through freeze-thaw cycle tests, unconfined compressive strength tests, and nuclear magnetic resonance (NMR) analysis, evaluates the freeze-thaw resistance and durability of recycled concrete samples under varying freeze-thaw cycles. The results indicate that an appropriate addition of SAP significantly enhances the freeze-thaw resistance of recycled concrete. After 200 freeze-thaw cycles, the RS0.6 sample retained good surface integrity, demonstrating the best performance. Compared to NAC, its mass loss decreased by 1.16%, the relative dynamic modulus improved by 7.01%, and the compressive strength loss rate decreased by 5.41%. Additionally, <i>T</i><sub>2</sub> spectrum analysis revealed that adding SAP optimized the pore structure of recycled concrete and mitigated pore development during freeze-thaw cycles. As the number of freeze-thaw cycles increased, the RS0.3 and RS0.6 samples demonstrated superior frost resistance compared to NAC. However, an excessive amount of SAP increased pore expansion during subsequent freeze-thaw cycles, ultimately weakening frost resistance.</p>

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Durability of SAP-modified Fully Recycled Concrete under Freeze-Thaw Cycles

  • 期刊论文

  • 发表日期：

    2026年1月6日

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  • Zhengguang Xing,
  • Erxing Peng,
  • Mingyi Zhang,
  • Wansheng Pei,
  • Xiaoying Hu,
  • Haoyue Sun

摘要

This study introduces superabsorbent polymers (SAP) into recycled concrete and, through freeze-thaw cycle tests, unconfined compressive strength tests, and nuclear magnetic resonance (NMR) analysis, evaluates the freeze-thaw resistance and durability of recycled concrete samples under varying freeze-thaw cycles. The results indicate that an appropriate addition of SAP significantly enhances the freeze-thaw resistance of recycled concrete. After 200 freeze-thaw cycles, the RS0.6 sample retained good surface integrity, demonstrating the best performance. Compared to NAC, its mass loss decreased by 1.16%, the relative dynamic modulus improved by 7.01%, and the compressive strength loss rate decreased by 5.41%. Additionally, T2 spectrum analysis revealed that adding SAP optimized the pore structure of recycled concrete and mitigated pore development during freeze-thaw cycles. As the number of freeze-thaw cycles increased, the RS0.3 and RS0.6 samples demonstrated superior frost resistance compared to NAC. However, an excessive amount of SAP increased pore expansion during subsequent freeze-thaw cycles, ultimately weakening frost resistance.