癸酸-硬脂酸/陶粒相变蓄热混凝土的制备及性能

doi:10.12028/j.issn.2095-4239.2016.0078

摘要/Abstract

摘要： 采用真空吸附法使多孔陶粒吸附癸酸-硬脂酸复合相变材料，经硅溶胶表面封装后制备出相变陶粒，然后将其作为粗骨料制备蓄热混凝土。研究了癸酸-硬脂酸复合相变材料的热物性和蓄热混凝土抗压及抗折强度在热循环前后的变化规律，通过模型房实验对比分析了蓄热混凝土的蓄热性能，采用热工计算研究了相变墙的蓄热能力。结果表明癸酸-硬脂酸复合相变材料经过600次热循环后热稳定性良好，相变陶粒掺量为60%（质量分数）的蓄热混凝土试块经过600次热循环后抗压及抗折强度分别比热循环前增加了22.3%和13.2%，模型房实验对比发现，在中心温度和内侧面温度处，相变模型房的平均温度比普通模型房分别低5 ℃和6 ℃，相变蓄热时间持续约25 min，通过热工计算，在202 mm外墙的混凝土层中掺入4.20 kg/m2相变陶粒后，其与282 mm外墙有相同的隔热效果,说明该相变陶粒可以提高墙体的蓄热能力。

关键词: 相变材料, 硅溶胶, 相变陶粒, 蓄热混凝土

Abstract: A vacuum adsorption method was used to make ceramsite particles to absorb capric acid-stearic acid based phase change materials (PCMs).These, upon subsequent surface sealing with silica sol, gave shape-stable encapsulated PCM particles. These encapsulated particles were then used as aggregates in cement formulation to obtain composite PCM concrete. The composite PCM concrete was characterized for their thermal and mechanical properties. The thermal storage performance of the composite PCM concrete was studied though contrast experiments in a model room. The results indicate that the composite PCM concrete has a good thermal stability demonstrated through 600 thermal cycles. At a load of 60% (by mass) composite PCM particles in the aggregates, the compressive strength and flexural strength of the concrete is increased respectively by 22.3% and 13.2% after 600 thermal cycles. The model room contrast experiments showed that the centre and interior average temperatures of the model house are 5 ℃ and 6 ℃ lower than that of the ordinary model room, with the phase change process lasting approximately 25 minutes. Analyses suggest when a concrete wall of 202 mm thickness is mixed with 4.20 kg/m2 PCM composite particles, it could achieve the same thermal insulation effect as a 282 mm thickness wall, illustrating the substantial enhancement of thermal storage capacity of the wall through the use of PCM.

Key words: phase change materials, silica sol, phase change ceramsite(PCCs), thermal storage concrete

朱教群，李佳龙，周卫兵，李儒光. 癸酸-硬脂酸/陶粒相变蓄热混凝土的制备及性能[J]. 储能科学与技术, 2017, 6(2): 255-262.

ZHU Jiaoqun, LI Jialong, ZHOU Weibing, LI Ruguang. Preparation and characterization of a capric acid-stearic acid-ceramsite-concrete composite phase change material[J]. Energy Storage Science and Technology, 2017, 6(2): 255-262.

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