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Improvement Mechanism of the Mechanical Properties and Pore Structure of Rubber Lightweight Aggregate Concrete with S95 Slag

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  • Zihao Guo

    (College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China)

  • Hailong Wang

    (College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China
    Autonomous Region Collaborative Innovation Center for Integrated Management of Water Resources and Water Environment in Inner Mongolia Section of Yellow River Basin, Hohhot 010018, China)

  • Song Sun

    (Gansu Provincial Seismological Bureau, Lanzhou 730000, China)

  • Shuai Feng

    (College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China)

  • Libin Shu

    (College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China)

  • Chao Tang

    (College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China)

Abstract

This paper used natural pumice from the Inner Mongolia region as coarse aggregate to produce a lightweight concrete mix with a 3% rubber particle (20 mesh) content and dissimilar slag contents (0%, 5%, 10%, 15%, 20%, 25%, and 30%). It measured the compressive strength in five periods (3, 7, 14, 21, and 28 d). It also observed the development of the microstructure and measured the air content and pore distribution of the concrete using environmental scanning electron microscopy and nuclear magnetic resonance. A microtest combined with macroscopic mechanical experiments were used to analyze the influence on the mechanical properties of the rubber lightweight aggregate by the content of the S95 slag. The results showed that slag can improve the microstructure of rubber lightweight aggregate concrete. It hydrated the products, optimized the porous structure, and enhanced the compressive strength of the rubber lightweight aggregate concrete at 28 days, with excellent results regarding the air entraining. The best compressive strength of the rubber powder lightweight aggregate concrete at 28 days was when the content of the slag was 15%. An Atzeni pore-structure–strength model was introduced that contained a cement mass fraction. The results of the fitting indicate that the pore structure located at 0.1~1 μm had a marked influence on the mechanical properties of the rubber powder concrete.

Suggested Citation

  • Zihao Guo & Hailong Wang & Song Sun & Shuai Feng & Libin Shu & Chao Tang, 2023. "Improvement Mechanism of the Mechanical Properties and Pore Structure of Rubber Lightweight Aggregate Concrete with S95 Slag," Sustainability, MDPI, vol. 15(2), pages 1-11, January.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:2:p:1008-:d:1026275
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    References listed on IDEAS

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    1. Xu, Jin-Hua & Fleiter, Tobias & Eichhammer, Wolfgang & Fan, Ying, 2012. "Energy consumption and CO2 emissions in China's cement industry: A perspective from LMDI decomposition analysis," Energy Policy, Elsevier, vol. 50(C), pages 821-832.
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