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Effect of Silicone Waterproofing Agent on Properties and Microstructure of Fly Ash-cement Based Wall Insulation Materials in High-humidity Environment

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Abstract

In this study, industrial-waste fly ash and ordinary Portland cement (P.O 42.5R) were used as the main raw materials, NaOH-KOH as the alkali activator, modified sodium rosin as the foaming agent and silicone as the waterproofing agent, a physical foaming technology was used to prepare fly ash-cement based wall insulation materials. Based on analyses of the physical and thermal properties and the microstructure of the samples, the effect mechanism of a silicone waterproofing agent on the pore structure of the samples and the change rule of the thermal performance of the samples in a high-humidity environment were identified. The results show that adding a silicone waterproofing agent can significantly reduce the water absorption and thermal conductivity of fly ash-cement based wall insulation materials, but the addition of more than 1.5 % will cause a decrease in compactness and mechanical properties. In a high-humidity environment, the thermal conductivity of the fly ash-cement based wall insulation materials increases significantly by 255.21 %, but when 1 % silicone waterproofing agent was added, the thermal conductivity increased only slightly by 27.42 %. The silicone waterproofing agent was found to have a protective effect on the foam in the slurry, which improves the pore structure of the fly ash-cement based wall insulation materials and forms a hydrophobic mesh film on the surface of pores and cracks in the samples. This effectively improves the waterproofing performance of the samples and inhibits the decrease in their thermal performance in a high-humidity environment.

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All data are available from the corresponding author.

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Funding

The present work was funded by the science and technology research program of Chongqing Education Commission of China (No. KJQN201901412 and KJ1712317) and the Natural Science Foundation of Chongqing (No. cstc2019jcyj-msxmX0508).

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Authors and Affiliations

  1. School of Civil and Architectural Engineering, Yangtze Normal University, Chongqing, 408100, China

    Liang Zhao, Huanhuan Chen, Qian Huang & Min Zhao

  2. College of Materials Science and Engineering, Chongqing University, 400045, Chongqing, China

    Mingtao Zhang

  3. College of Materials Science and Engineering, Xi’an University of Architecture and Technology, 721000, Xi’an, China

    Qunhu Xue

Authors
  1. Liang Zhao
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  2. Mingtao Zhang
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  3. Huanhuan Chen
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  4. Qunhu Xue
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  5. Qian Huang
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  6. Min Zhao
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Contributions

All authors contributed to the study conception, modeling and analysis. All the authors have contributed in writing the manuscript and approved the final manuscript.

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Correspondence to Mingtao Zhang.

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Zhao, L., Zhang, M., Chen, H. et al. Effect of Silicone Waterproofing Agent on Properties and Microstructure of Fly Ash-cement Based Wall Insulation Materials in High-humidity Environment. Silicon 14, 6873–6879 (2022). https://doi.org/10.1007/s12633-021-01468-8

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  • DOI: https://doi.org/10.1007/s12633-021-01468-8

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