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<p>High-temperature and low-humidity environments can cause premature moisture loss in concrete during on-site curing, leading to insufficient water for continued hydration and reduced durability. Superabsorbent polymers (SAPs) can mitigate this problem by releasing stored water and maintaining internal humidity. To determine the optimal SAP dosage and mesh size for high-temperature and low-humidity environments, this study investigated the internal curing effect and freeze–thaw resistance after 200 cycles of SAP internally cured concrete. Laboratory-simulated high-temperature and low-humidity curing conditions were established and compared with standard curing conditions. The effects of SAP particle size, dosage, and curing condition on drying shrinkage strain, compressive strength, flexural strength, and chloride ion penetration resistance were analyzed. Microscopic tests were also conducted to reveal the underlying improvement mechanisms. The results showed that overly coarse SAP particles or excessive SAP dosage may introduce defects into concrete that outweigh the benefits of internal curing. The optimal overall performance was achieved at an SAP mesh size of 100–120 and a dosage of 0.17 wt%. SAP mitigated the performance degradation of concrete under harsh curing conditions by replenishing internal moisture and supporting continued hydration. Microscopic observations indicated that SAP refined the pore structure, slowed crack propagation, and reduced moisture ingress. In addition, SAP-induced water-release pores acted similarly to entrained air voids, thereby improving freeze–thaw resistance.</p>

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Effect of Curing Environment on SAP Internally Cured Concrete and Its Long-Term Freeze-Thaw Resistance Performance

  • 期刊论文

  • 发表日期：

    2026年7月24日

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  • Qidong Li,
  • Aiqin Shen,
  • Yinchuan Guo,
  • Rongwei Chen,
  • Xiaoying Yang,
  • Ran Zhang

摘要

High-temperature and low-humidity environments can cause premature moisture loss in concrete during on-site curing, leading to insufficient water for continued hydration and reduced durability. Superabsorbent polymers (SAPs) can mitigate this problem by releasing stored water and maintaining internal humidity. To determine the optimal SAP dosage and mesh size for high-temperature and low-humidity environments, this study investigated the internal curing effect and freeze–thaw resistance after 200 cycles of SAP internally cured concrete. Laboratory-simulated high-temperature and low-humidity curing conditions were established and compared with standard curing conditions. The effects of SAP particle size, dosage, and curing condition on drying shrinkage strain, compressive strength, flexural strength, and chloride ion penetration resistance were analyzed. Microscopic tests were also conducted to reveal the underlying improvement mechanisms. The results showed that overly coarse SAP particles or excessive SAP dosage may introduce defects into concrete that outweigh the benefits of internal curing. The optimal overall performance was achieved at an SAP mesh size of 100–120 and a dosage of 0.17 wt%. SAP mitigated the performance degradation of concrete under harsh curing conditions by replenishing internal moisture and supporting continued hydration. Microscopic observations indicated that SAP refined the pore structure, slowed crack propagation, and reduced moisture ingress. In addition, SAP-induced water-release pores acted similarly to entrained air voids, thereby improving freeze–thaw resistance.