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<p>Phase-change concrete (PCC) is a promising multifunctional material for reducing hydration-induced temperature rise and improving the thermal regulation capacity of concrete structures. However, phase change material (PCM) incorporation may cause leakage, weaken mechanical properties, and affect long-term stability, limiting its application in structural concrete. To address these issues, this study developed a structural thermoregulation-integrated PCC using a shape-stabilized CA-MA-SA/nano-SiO<sub>2</sub> composite PCM. Direct addition and sand replacement methods were compared, and the effects of PCM dosage and water-cement ratio on workability, mechanical properties, hydration heat regulation, phase-change cycling stability, and microstructure were investigated. Slump tests, compressive and splitting tensile strength tests, phase-change cycling tests, isothermal calorimetry, adiabatic temperature rise tests, SEM observations, and model fitting were conducted. The results showed that the composite PCM reduced and delayed early hydration heat release, decreasing the 7-day adiabatic temperature rise by up to 13.54%. The sand replacement method provided better mechanical performance than direct addition. At 4% PCM content and a water-cement ratio of 0.35, the sand-replacement PCC achieved a 28-day compressive strength of 47.81&#xa0;MPa, splitting tensile strength of 4.68&#xa0;MPa, and 7-day adiabatic temperature rise of 51.89&#xa0;°C, meeting the C40 strength requirement. After 100 phase-change cycles, strength losses remained below 4%. SEM results confirmed good interfacial compatibility between the composite PCM and cement matrix. These findings demonstrate that the proposed PCC balances structural strength and thermal regulation, providing a feasible strategy for temperature-controlled and energy-efficient concrete structures.</p>

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Thermal, mechanical, and microstructural properties of structural thermoregulation-integrated phase change concrete for buildings

  • 期刊论文

  • 发表日期：

    2026年7月3日

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  • Yazhen Sun,
  • Fang He,
  • Jing Hu,
  • Jinchang Wang,
  • Baiquan Fu,
  • Weiyi Tang

摘要

Phase-change concrete (PCC) is a promising multifunctional material for reducing hydration-induced temperature rise and improving the thermal regulation capacity of concrete structures. However, phase change material (PCM) incorporation may cause leakage, weaken mechanical properties, and affect long-term stability, limiting its application in structural concrete. To address these issues, this study developed a structural thermoregulation-integrated PCC using a shape-stabilized CA-MA-SA/nano-SiO2 composite PCM. Direct addition and sand replacement methods were compared, and the effects of PCM dosage and water-cement ratio on workability, mechanical properties, hydration heat regulation, phase-change cycling stability, and microstructure were investigated. Slump tests, compressive and splitting tensile strength tests, phase-change cycling tests, isothermal calorimetry, adiabatic temperature rise tests, SEM observations, and model fitting were conducted. The results showed that the composite PCM reduced and delayed early hydration heat release, decreasing the 7-day adiabatic temperature rise by up to 13.54%. The sand replacement method provided better mechanical performance than direct addition. At 4% PCM content and a water-cement ratio of 0.35, the sand-replacement PCC achieved a 28-day compressive strength of 47.81 MPa, splitting tensile strength of 4.68 MPa, and 7-day adiabatic temperature rise of 51.89 °C, meeting the C40 strength requirement. After 100 phase-change cycles, strength losses remained below 4%. SEM results confirmed good interfacial compatibility between the composite PCM and cement matrix. These findings demonstrate that the proposed PCC balances structural strength and thermal regulation, providing a feasible strategy for temperature-controlled and energy-efficient concrete structures.