摘要
以月桂酸为相变原材料,膨胀石墨为吸附基体,采用直接吸附法得到了月桂酸/膨胀石墨复合定形相变材料(LA/EG-CPCMs),并按绝对体积法将LA、LA/EG-CPCMs掺入混凝土中制备得到相变混凝土。采用电镜扫描仪、红外光谱仪、综合热分析仪分别测试了LA/EG-CPCMs的微观结构、相容性及储能特性,并测试了相变混凝土的抗压强度及导热系数变化规律。结果表明:月桂酸与膨胀石墨相容性良好,吸附率可达到89%,经200次热循环后,质量损失率为3. 58%,LA/EG-CPCMs相变起始温度为43. 4℃,熔融焓值为155. 7 J/g,掺量为5%的相变混凝土强度降幅为7. 5%左右,在保证混凝土工作性能良好的情况下,LA/EG-CPCMs的掺加可以明显提高混凝土的导热系数。
Using lauric acid and expanded graphite as adsorption matrix,lauric acid/expanded graphite composite phase change materials(LA/EG-CPCMs)were obtained by direct adsorption method,and LA,LA/EG-CPCMs were mixed into concrete by absolute volume method to prepare phase change concrete.Microstmcture,compatibility and energy storage properties of LA/EG-CPCMs were tested by scanning electron microscopy,infrared spectroscopy and comprehensive thermal analysis.The compressive strength and thermal conductivity of phase change concrete were tested.The results show that lauric acid has good compatibility with expanded graphite,and the adsorption rate can reach 89%.After 200 thermal cycles,the mass loss rate is 3.58%.The starting temperature of phase transformation of LA/EG-CPCMs is 43.4℃,the melting enthalpy is 155.7 J/g,and the strength of phase-change concrete with 5%content decreases by about 7.5%.The good working performance of concrete is guaranteed.The addition of LA/EG-CPCMs can obviously improve the thermal conductivity of concrete.
作者
聂志新
周建庭
张华彬
杨娟
马虎
NIE Zhi-Xin;ZHOU Jian-ting;ZHANG Hua-bin;YANG Juan;MA Hu(School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Chongqing Rail Transit(Group)Limited Company,Chongqing 401120,China)
出处
《硅酸盐通报》
CAS
北大核心
2019年第7期2235-2241,共7页
Bulletin of the Chinese Ceramic Society
基金
国家重点研发计划(2017YFC0806007)
国家杰出青年科学基金(51425801)
重庆市技术创新与应用示范项目(cstc2018jscxmszdX0084)
关键词
月桂酸
膨胀石墨
相变混凝土
抗压强度
导热系数
lauric acid
expanded graphite
phase change concrete
compressive strength
thermal conductivity
