膨胀珍珠岩-石蜡相变储能砂浆的力学性能研究

Research on Mechanical Propreties of Expanded Perlite Paraffin Phase Change Mortar

利用膨胀珍珠岩对石蜡具有良好的吸附性能,以石蜡为蓄热芯材,膨胀珍珠岩为载体,经碱矿渣封装后,制备了膨胀珍珠岩-石蜡复合相变储热材料。由于毛细作用力和表面张力的作用,石蜡在相变过程中,很难从膨胀珍珠岩的微孔中渗透出来。将相变储能珍珠岩作为细集料制备出相变储能砂浆,对其热物理性能力学性能进行了试验研究,结果表明:采用碱矿渣对吸附了相变材料的珍珠岩表面进行封装,相变材料的质量损失率、潜热变化率及温度变化率均较小,封密性和稳定性较好;相变循环对砂浆强度影响较小;在配合比相同的情况下,相变材料对砂浆的强度影响较大,相变储能砂浆的抗压强度低于普通砂浆。

The expanded perlite has a good adsorption performance to paraffin. Paraffin / expanded perlite compound phase change energy storage material was composed of the paraffin as heat storage core material and expanded graphite as the carrier. During the phase change process,it was difficult for paraffin to penetrate from the pores of expanded perlite because of the capillary forces and surface tension. Expanded perlite phase change energy storage mortar was prepared,and its mechanics properties was studied. It was found that the compressive strength of phase change energy storage mortar was lower than that of ordinary mortar when they were in the same mix proportion.