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<p>Microencapsulated phase change materials (mPCM) emerge as sustainable thermal energy regulation additives for enhancing concrete durability in cold climates. This investigation systematically evaluates the dose-dependent effects of mPCM incorporation (0–12% cement replacement) on mechanical-strength development and freeze-thaw resistance through comprehensive mechanical testing, 100-cycle accelerated freeze-thaw evaluations, and quantitative microstructural analysis. The experimental findings reveal a critical biphasic relationship: Optimal 6% mPCM addition significantly enhances mechanical performance with 8.90%, 19.23%, and 30.72% improvements in ompressive strength, flexural strength, and splitting tensile strength versus control, while maintaining exceptional frost durability (1.6% mass loss and &lt; 15% strength degradation post-freeze-thaw). Microstructural analysis reveals that 6% mPCM optimizes the pore structure of concrete by reducing pore size and moderately increasing porosity, thereby enhancing freeze-thaw durability. Beyond the critical 9% threshold, the concrete matrix becomes loose, leading to a decline in overall strength. The established dosage-property correlation provides practical guidance for cold-region concrete design, demonstrating that 6% mPCM incorporation achieves synergistic enhancement of load-bearing capacity and phase-change-enabled thermal stress mitigation.</p>

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Mechanical properties and Freeze-Thaw durability of concrete modified with microencapsulated phase change materials

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年8月11日

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  • Zhitao Zheng,
  • Wenbing Shen,
  • Sheng Li,
  • Chuang Li,
  • Pengjia Yin,
  • Mingjun Guan,
  • Jizhang Ha

摘要

Microencapsulated phase change materials (mPCM) emerge as sustainable thermal energy regulation additives for enhancing concrete durability in cold climates. This investigation systematically evaluates the dose-dependent effects of mPCM incorporation (0–12% cement replacement) on mechanical-strength development and freeze-thaw resistance through comprehensive mechanical testing, 100-cycle accelerated freeze-thaw evaluations, and quantitative microstructural analysis. The experimental findings reveal a critical biphasic relationship: Optimal 6% mPCM addition significantly enhances mechanical performance with 8.90%, 19.23%, and 30.72% improvements in ompressive strength, flexural strength, and splitting tensile strength versus control, while maintaining exceptional frost durability (1.6% mass loss and < 15% strength degradation post-freeze-thaw). Microstructural analysis reveals that 6% mPCM optimizes the pore structure of concrete by reducing pore size and moderately increasing porosity, thereby enhancing freeze-thaw durability. Beyond the critical 9% threshold, the concrete matrix becomes loose, leading to a decline in overall strength. The established dosage-property correlation provides practical guidance for cold-region concrete design, demonstrating that 6% mPCM incorporation achieves synergistic enhancement of load-bearing capacity and phase-change-enabled thermal stress mitigation.