In this paper, the influence of paraffin/expanded vermiculite-diatomite form stable composite phase change materials (paraffin/EVC-D FSCPCM) on the strength and thermal properties of the mortar was studied through experiments and numerical simulations. The mechanical properties, thermal conductivity and thermoregulation performance of the paraffin/EVC-D FSCPCM integrated mortar were studied in detail. Meanwhile, the energy-saving effect of the paraffin/EVC-D FSCPCM integrated mortar in building was studied by numerical simulation. Thermal-cycling test results indicated a 10.9% leakage reduction of form stable composite phase change material with a diatomite coating. Strength test results showed the addition of diatomite increased the compressive strength of paraffin/EVC-D FSCPCM integrated mortar. The thermoregulation performance test showed the paraffin/EVC-D FSCPCM integrated mortar displayed good thermoregulation performance regardless of the testing conditions (lab-scale or actual environment). During laboratory-scale thermal regulation performance testing, when the volume replacement rate of paraffin/EVC-D FSCPCM to sand reaches 70%, the paraffin/EVC-D FSCPCM integrated mortar reduced the maximum temperature of the testing room by 3.1 °C; in an actual environment, it reduced the maximum temperature of the wall board by 2.68 °C. The simulation results showed that in summer, compared with cement mortar, the use of paraffin/EVC-D FSCPCM integrated mortar in the building could save 17.03% of energy consumption.

本文通过实验和数值模拟研究了石蜡/膨胀蛭石-硅藻土形成稳定复合相变材料（石蜡/EVC-D FSCPCM）对砂浆强度和热性能的影响。详细研究了石蜡/EVC-D FSCPCM一体化砂浆的力学性能、导热系数和调温性能。同时，通过数值模拟研究了石蜡/EVC-D FSCPCM集成砂浆在建筑中的节能效果。热循环测试结果表明，具有硅藻土涂层的稳定复合相变材料的泄漏减少了 10.9%。强度试验结果表明，硅藻土的加入提高了石蜡/EVC-D FSCPCM复合砂浆的抗压强度。温度调节性能测试表明，无论在何种测试条件下（实验室规模或实际环境），石蜡/EVC-D FSCPCM 集成砂浆都显示出良好的温度调节性能。在实验室规模的热调节性能测试中，当石蜡/EVC-D FSCPCM对砂的体积置换率达到70%时，石蜡/EVC-D FSCPCM集成砂浆使试验室最高温度降低3.1℃；在实际环境中，它使墙板的最高温度降低了2.68°C。模拟结果表明，在夏季，与水泥砂浆相比，在建筑中使用石蜡/EVC-D FSCPCM一体化砂浆可节能17.03%。