A multi-scale micromechanical investigation on thermal conductivity of cement-based composites

1st International Conference on New Material and Chemical Industry

材料科学;化学工业

Liu, Jiahan^1 ; Xu, Shilang^1 ; Zeng, Qiang^1

Institute of Advanced Engineering Structures and Materials, Zhejiang University, Hangzhou

310058, China^1

关键词: Cement based composites;    Conductivity estimation;    Eshelby equivalent inclusion;    Experimental values;    Micro-mechanical modeling;    Multi-scale Modeling;    Thermal insulation materials;    Water to cement (binder) ratios;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/167/1/012069/pdf
DOI  :  10.1088/1757-899X/167/1/012069

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Cement-based composites (CBCs) are one of the most widely used materials in construction. An appealing characterization of thermal conductivity of CBCs plays an essential role to evaluate the energy consumption in buildings and to facilitate the development of novel thermal insulation materials. Based on Eshelby equivalent inclusion principle and multi-scale methodology, this paper attempted to present a generalized multi-scale micromechanical model in terms of thermal performance of the CBCs, which covers some classic models for thermal conductivity estimation. A Mori-Tanaka homogenization method was applied to investigate the thermal conductivity of the CBCs of different compounds, water-to-cement ratios and curing ages. In addition, saturation degree factor was considered. The results of this model are in good agreement with the experimental value, showing that the multi-scale model developed in this paper is able to evaluate the thermal conductivity of the CBCs in different conditions.