基于细观尺度的再生混凝土多相导热系数理论模型

doi:10.11896/cldb.21110080

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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.

Key words： recycled concrete thermal conductivity mesoscale interface transition zone composite material heat transfer mechanism

Published: 25 June 2023 Online: 2023-06-20

CLC number:

TU528.01

Fund:Key Industry Innovation Chain (Group) Project of Shaanxi Department of Science and Technology Department(2018ZDCXL-SF-03-03-01).

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	ZHU Lihua
	LIU Hailin
	HAN Wei

Cite this article:

ZHU Lihua,LIU Hailin,HAN Wei. Theoretical Model of Multiphase Thermal Conductivity of Recycled Concrete Based on Mesoscale[J]. Materials Reports, 2023, 37(12): 21110080-7.

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http://www.mater-rep.com/EN/10.11896/cldb.21110080 OR http://www.mater-rep.com/EN/Y2023/V37/I12/21110080

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