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Studying Thermal and Mechanical Properties of Recycled Concrete by Using Ceramic Aggregate

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  • Yumei Wang

    (College of Architecture and Civil Engineering, Nanning University, Nanning 541699, China
    Department of Structural Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China)

  • Jinyan Wang

    (College of Urban and Rural Construction, Guangxi Vocational University of Agriculture, Nanning 530007, China
    Guangxi Key Laboratory of Disaster Prevention and Engineering Safety, Guangxi University, Nanning 530004, China)

  • Zhiheng Deng

    (Guangxi Key Laboratory of Disaster Prevention and Engineering Safety, Guangxi University, Nanning 530004, China)

  • Jianzhuang Xiao

    (Department of Structural Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China)

Abstract

Ceramic aggregate has the characteristics of light weight, heat insulation, and low cost, and recycled aggregate is a type of green material that realizes the re-crushing of construction waste. This paper studied the impact of replacing natural coarse aggregate with ceramic aggregate and natural sand with recycled fine aggregate, on the physical, mechanical, and thermal properties of concrete. Recycled fine aggregate was used to completely replace natural sand. A total of five concrete mixes (including a reference mix) were prepared with different levels of ceramic aggregate (0%, 30%, 50%, 70%, 100%). Density, compressive strength, thermal conductivity, and thermal inertia index were measured to evaluate the performance of each mixture, and ceramic concrete board and hollow blocks were designed for testing the thermal properties. Results of testing show that density, strength, and thermal performance are interrelated. The smaller the density, the lower the strength, and it indicates that ceramic aggregate has a negative influence on strength in concrete. Meanwhile, the smaller the density, the higher the thermal resistance, and the addition of ceramic aggregate can improve the thermal insulation of concrete. The mechanical and thermal properties are both affected by the ceramic replacement ratio. Ceramic aggregate improves the thermal properties of recycled concrete, and the negative influence of ceramic aggregate on compressive strength can be controlled by the replacement ratio of aggregate in concrete. Based on the overall comparison and analysis, a mix with 50% ceramic aggregate shows relatively better strength and thermal insulation compared to other mixes. The use of ceramic aggregate in combination with recycled fine aggregate can effectively reduce the environmental pollution and make an economical substitute for their natural counterparts.

Suggested Citation

  • Yumei Wang & Jinyan Wang & Zhiheng Deng & Jianzhuang Xiao, 2023. "Studying Thermal and Mechanical Properties of Recycled Concrete by Using Ceramic Aggregate," Sustainability, MDPI, vol. 15(3), pages 1-14, February.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:3:p:2642-:d:1054404
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    References listed on IDEAS

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    1. D'Alessandro, Antonella & Pisello, Anna Laura & Fabiani, Claudia & Ubertini, Filippo & Cabeza, Luisa F. & Cotana, Franco, 2018. "Multifunctional smart concretes with novel phase change materials: Mechanical and thermo-energy investigation," Applied Energy, Elsevier, vol. 212(C), pages 1448-1461.
    2. Cheeseman, C.R. & Virdi, G.S., 2005. "Properties and microstructure of lightweight aggregate produced from sintered sewage sludge ash," Resources, Conservation & Recycling, Elsevier, vol. 45(1), pages 18-30.
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