Applications of graphite-enabled phase change material composites to improve thermal performance of cementitious materials

2017 International Conference on Building Materials and Materials Engineering

材料科学;土木建筑工程

Li, Mingli^1 ; Lin, Zhibin^1 ; Wu, Lili^2 ; Wang, Jinhui^3 ; Gong, Na^3

Department of Civil and Environmental Engineering, North Dakota State University, 1410, North 14th Avenue, Fargo

ND

58105, United States^1

School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing

100083, China^2

Department of Electrical and Computer Engineering, North Dakota State University, Fargo

ND

58105, United States^3

关键词: Cementitious composites;    Cementitious materials;    Engineered cementitious composite (ECC);    Enhanced thermal conductivity;    Heat storage capacity;    Microencapsulated phase change material;    Microencapsulated phase change material (MEPCM);    Thermal and mechanical properties;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/264/1/012013/pdf
DOI  :  10.1088/1757-899X/264/1/012013

来源: IOP

【 摘 要 】

Enhancing the thermal efficiency to decrease the energy consumption of structures has been the topic of much research. In this study, a graphite-enabled microencapsulated phase change material (GE-MEPCM) was used in the production of a novel thermal energy storage engineered cementitious composite feathering high heat storage capacity and enhanced thermal conductivity. The surface morphology and particle size of the microencapsulated phase change material (MEPCM) were investigated by scanning electron microscopy (SEM). Thermal properties of MEPCM was determined using differential scanning calorimetry (DSC). In addition, thermal and mechanical properties of the cementitious mortar with different admixtures were explored and compared with those of a cementitious composite. It was shown that the latent heat of MEPCM was 162 J/g, offering much better thermal energy storage capacity to the cementitious composite. However, MEPCM was found to decrease the thermal conductivity of the composite, which can be effectively solved by adding natural graphite (NG). Moreover, the incorporation of MEPCM has a certain decrease in the compressive strength, mainly due to the weak interfaces between MEPCM and cement matrix.