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Research on the Performance of Recycled-Straw Insulating Concrete and Optimization Design of Matching Ratio

Author

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  • Jun-Xi Deng

    (College of Transportation and Civil Engineering, Fujian Agriculture and Forestry University, Fuzhou 350108, China)

  • Xiao Li

    (College of Transportation and Civil Engineering, Fujian Agriculture and Forestry University, Fuzhou 350108, China)

  • Xiao-Juan Li

    (College of Transportation and Civil Engineering, Fujian Agriculture and Forestry University, Fuzhou 350108, China)

  • Tai-Bing Wei

    (Department of Civil Engineering and Architecture, Wuyi University, Wuyishan 354300, China)

Abstract

Construction solid waste and agricultural waste, as renewable resources, have gained increasing attention recently. This research aims to explore the mechanical and thermal properties of recycled-straw insulating concrete commonly made with construction waste and straw in northern Fujian, which can provide useful suggestions for the practical use of recycled-straw insulating concrete. The effects of recycled coarse aggregate, fly ash, and straw on the mechanical and thermal properties of recycled-straw insulating concrete were investigated by orthogonal tests. The results of the orthogonal tests were optimized by the total efficacy coefficient method to obtain the optimal mix ratio of recycled-straw insulating concrete. Combined with the finite element analysis software ANSYS Workbench, the heat transfer performance of the recycled-straw insulating concrete walls was analyzed to simulate the insulation performance of the walls. The compressive strength of the recycled-straw insulating concrete with the optimal ratio was found to be 30.93 MPa, and the thermal conductivity was 0.5051 W/(m·K). The steady-state thermal analysis of the recycled-straw insulating concrete wall and the plain concrete wall was carried out by finite element software, and the simulation results showed that the insulation performance of the recycled-straw insulating concrete walls was improved by 145% compared with the plain concrete wall. These results indicate that the recycled-straw insulating concrete wall has better thermal insulation performance and can be applied to building envelopes to save heating costs in winter and reduce carbon dioxide emissions, which has significant economic and environmental significance for areas with low outdoor temperatures in winter and long heating periods.

Suggested Citation

  • Jun-Xi Deng & Xiao Li & Xiao-Juan Li & Tai-Bing Wei, 2023. "Research on the Performance of Recycled-Straw Insulating Concrete and Optimization Design of Matching Ratio," Sustainability, MDPI, vol. 15(12), pages 1-24, June.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:12:p:9608-:d:1171618
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    References listed on IDEAS

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    1. Jan Pešta & Tereza Pavlů & Kristina Fořtová & Vladimír Kočí, 2020. "Sustainable Masonry Made from Recycled Aggregates: LCA Case Study," Sustainability, MDPI, vol. 12(4), pages 1-21, February.
    2. Feraidon Ataie, 2018. "Influence of Rice Straw Fibers on Concrete Strength and Drying Shrinkage," Sustainability, MDPI, vol. 10(7), pages 1-13, July.
    3. Sérgio Roberto Da Silva & Jairo José de Oliveira Andrade, 2022. "A Review on the Effect of Mechanical Properties and Durability of Concrete with Construction and Demolition Waste (CDW) and Fly Ash in the Production of New Cement Concrete," Sustainability, MDPI, vol. 14(11), pages 1-27, May.
    4. Jesús M. Blanco & Yokasta García Frómeta & Maggi Madrid & Jesús Cuadrado, 2021. "Thermal Performance Assessment of Walls Made of Three Types of Sustainable Concrete Blocks by Means of FEM and Validated through an Extensive Measurement Campaign," Sustainability, MDPI, vol. 13(1), pages 1-18, January.
    5. Taha Ashour & Mohamad Morsy & Azra Korjenic & Henriette Fischer & Mervat Khalil & Eldira Sesto & Mohammed Orabi & Ibrahim Yehia, 2021. "Engineering Parameters of Rice Straw Concrete with Granulated Blast Furnace Slag," Energies, MDPI, vol. 14(2), pages 1-14, January.
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