Theoretical Model of Multiphase Thermal Conductivity of Recycled Concrete Based on Mesoscale
ZHU Lihua1,2,*, LIU Hailin2, HAN Wei2
1 State Key Laboratory of Green Building in Western China, Xi’an University of Architecture & Technology, Xi’an 710055, China 2 School of Civil Engineering, Xi’an University of Architecture & Technology, Xi’an 710055, China
Abstract: In order to analyze the mechanism of the change of thermal conductivity for recycled concrete, a theoretical model of the thermal conductivity of recycled concrete was investigated. On the mesoscale, the recycled concrete is regarded as a four-phase composite material composed of new hardened mortar, natural aggregate, interface transition zone and pore phase. Using the equivalent method, the thermal conductivity model of interface transition zone was established and verified, and the NITZ impact factor η was defined, which has a significant linear relationship with the thermal conductivity of recycled concrete. Based on the thermal conductivity model of composite materials, a theoretical model of the thermal conductivity of recycled concrete was proposed by using η. The calculated results of the model agree basically with experimental results, and the error is less than 6%. On this basis, the influence of factors such as thermal conductivity of each phase component, water-cement ratio, aggregate replacement and pore saturation level on the thermal conductivity of recycled concrete was analyzed by the model, revealing the difference in heat transfer between recycled concrete and normal concrete, and laying a theoretical foundation for further research on the heat transfer mechanism of recycled concrete.
朱丽华, 刘海林, 韩伟. 基于细观尺度的再生混凝土多相导热系数理论模型[J]. 材料导报, 2023, 37(12): 21110080-7.
ZHU Lihua, LIU Hailin, HAN Wei. Theoretical Model of Multiphase Thermal Conductivity of Recycled Concrete Based on Mesoscale. Materials Reports, 2023, 37(12): 21110080-7.
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2023, Vol. 37 
