微胶囊相变材料对砂浆热性能和力学性能的影响

Effect of Microencapsulated Phase Change Material on Thermal and Mechanical Properties of Mortar

将微胶囊相变材料(MPCM)加入水泥砂浆中制成建筑储能砂浆,研究了储能砂浆的微观形貌、相变特性、热稳定性、导热系数、储热性能和力学性能.结果表明:储能砂浆的导热系数随MPCM含量的增加而降低;储能砂浆的MPCM芯材为固态时的导热系数大于其为液态时的导热系数;当MPCM含量为20%时,储能砂浆的内表面峰值温度较水泥砂浆降低3.1℃,达到峰值温度的时间比水泥砂浆延迟20.5 min,其28 d龄期硬化浆体的抗压强度为9.3 MPa;储能砂浆具有足够的抗压强度和良好的储能调温能力,可用于建筑围护结构.

The energy storage mortar for buildings was developed by incorporating microencapsulated phase change material(MPCM) into cement mortar. The microscopic morphology, phase change characteristics, thermal stability, thermal conductivity, thermal and mechanical properties of energy storage mortar were investigated. The results show that the thermal conductivity of energy storage mortar decreases with the increase of the content of MPCM.The thermal conductivity of the energy storage mortar with solid MPCM is greater than that of the energy storage mortar with liquid MPCM. The peak temperature of the inner surface of the energy storage mortar with 20% MPCM is 3.1 ℃ lower than that of the cement mortar, the time to reach the peak temperature is 20.5 min later than that of the cement mortar, and the compressive strength of which at the age of 28 d is 9.3 MPa. The energy storage mortar can be used in the building envelope due to its sufficient compressive strength and good ability of energy storage and temperature regulation.