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<p>To mitigate the impeded early hydration and severe shrinkage cracking of pavement concrete in seasonally frozen regions under low-temperature and low-humidity conditions, this study proposes a synergistic curing approach that integrates internal curing using a superabsorbent polymer (SAP) with external curing via a waterborne epoxy coating (WEC). The effects of SAP incorporation, WEC surface treatment, and their combined application (SW) on the mechanical properties, water retention, shrinkage, cracking resistance, and microstructure were systematically evaluated under both standard and low-temperature–low-humidity curing. Under standard curing, SW outperformed the single-curing methods, increasing the compressive and flexural strengths by 13.1% and 11.7%, respectively, compared to the reference group (JZ). Under low-temperature–low-humidity curing, the 28-day compressive and flexural strengths of SW increased by 14.4% and 9.2%, respectively. In addition, SW exhibits enhanced water retention, reducing the loss of internal relative humidity by 56% after 28 days. The drying shrinkage rate and thermal shrinkage coefficient decreased by 31.6% and 29.3%, respectively. Moreover, SW delayed the crack initiation by 46&#xa0;min and decreased the total cracking area per unit surface by 40.5%. Microstructural observations under low-temperature, low-humidity curing revealed dense, clustered calcium silicate hydrate (C-S-H) gels and layered calcium hydroxide (CH) crystals in the SW group, which filled the pores and produced a compact matrix. Overall, the SAP–WEC synergistic curing strategy improved early age hydration, strength development, and shrinkage–cracking resistance, providing experimental evidence for curing optimization and durability design in seasonally frozen regions.</p>

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Mechanical Properties and Shrinkage of Concrete Subjected to Synergistic Curing with Superabsorbent Polymers and Waterborne Epoxy Coating in Seasonally Frozen Regions

  • 期刊论文

  • 发表日期：

    2026年5月12日

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  • Xueyuan Du,
  • Zhiguo Chen,
  • Ruoting Shen,
  • Jiayu Chen,
  • Shike Shi,
  • Yinchuan Guo

摘要

To mitigate the impeded early hydration and severe shrinkage cracking of pavement concrete in seasonally frozen regions under low-temperature and low-humidity conditions, this study proposes a synergistic curing approach that integrates internal curing using a superabsorbent polymer (SAP) with external curing via a waterborne epoxy coating (WEC). The effects of SAP incorporation, WEC surface treatment, and their combined application (SW) on the mechanical properties, water retention, shrinkage, cracking resistance, and microstructure were systematically evaluated under both standard and low-temperature–low-humidity curing. Under standard curing, SW outperformed the single-curing methods, increasing the compressive and flexural strengths by 13.1% and 11.7%, respectively, compared to the reference group (JZ). Under low-temperature–low-humidity curing, the 28-day compressive and flexural strengths of SW increased by 14.4% and 9.2%, respectively. In addition, SW exhibits enhanced water retention, reducing the loss of internal relative humidity by 56% after 28 days. The drying shrinkage rate and thermal shrinkage coefficient decreased by 31.6% and 29.3%, respectively. Moreover, SW delayed the crack initiation by 46 min and decreased the total cracking area per unit surface by 40.5%. Microstructural observations under low-temperature, low-humidity curing revealed dense, clustered calcium silicate hydrate (C-S-H) gels and layered calcium hydroxide (CH) crystals in the SW group, which filled the pores and produced a compact matrix. Overall, the SAP–WEC synergistic curing strategy improved early age hydration, strength development, and shrinkage–cracking resistance, providing experimental evidence for curing optimization and durability design in seasonally frozen regions.