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This study investigates the development of porous geopolymeric structures with good thermal insulation and noise reduction capabilities. Pre-made foams stabilized with 2% Sodium Lauryl Sulfate (SLS) were added at varying dosages (10–15%) into fly ash-GGBS blend in the ratio of 60:40, with the binder activated using sodium silicate hardener. The impact of dosage of foam, curing temperature, and curing days on strength and density was evaluated. The binder phase present in the products was verified from XRD patterns and FTIR analysis. The resulting matrix displayed a compressive strength ranging from 3.13 to 10.91 MPa, decreasing with increasing foam content. Pore size distribution was examined using an image processing technique from the SEM micrograph and found to be in the range of 100–400 µm. The uniform distribution of pores facilitates a decrease in thermal conductivity (λ) as low as 0.023 W/mK by maintaining the density of the matrix at 620 kg/m3. To produce a thin panel of a matrix to determine their acoustic properties, cylindrical specimens of two different sizes of 25 × 29 mm and 25 × 99 mm cast and sound impedance data were collected. The acoustic absorption coefficients were observed in the range of 0.01 to 0.78, at 100–6300 Hz frequency surpassing the control OPC matrix as 0.02. The study results demonstrate the suitability of a porous geopolymeric matrix featuring larger voids and a stronger gel network as promising thermal insulation and noise reduction.

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Tailoring the Mechanical Strength of Porous Fly Ash-GGBS Alkalinized Geopolymer via Prefoaming for Thermal and Acoustic Characteristics

  • 会议论文

  • 发表日期：

    2025年

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  • Manivannan Muthusamy,
  • N. Vanitha,
  • Janani Karuppaiyan,
  • S. Surendhar,
  • R. Jeyalakshmi

摘要

This study investigates the development of porous geopolymeric structures with good thermal insulation and noise reduction capabilities. Pre-made foams stabilized with 2% Sodium Lauryl Sulfate (SLS) were added at varying dosages (10–15%) into fly ash-GGBS blend in the ratio of 60:40, with the binder activated using sodium silicate hardener. The impact of dosage of foam, curing temperature, and curing days on strength and density was evaluated. The binder phase present in the products was verified from XRD patterns and FTIR analysis. The resulting matrix displayed a compressive strength ranging from 3.13 to 10.91 MPa, decreasing with increasing foam content. Pore size distribution was examined using an image processing technique from the SEM micrograph and found to be in the range of 100–400 µm. The uniform distribution of pores facilitates a decrease in thermal conductivity (λ) as low as 0.023 W/mK by maintaining the density of the matrix at 620 kg/m3. To produce a thin panel of a matrix to determine their acoustic properties, cylindrical specimens of two different sizes of 25 × 29 mm and 25 × 99 mm cast and sound impedance data were collected. The acoustic absorption coefficients were observed in the range of 0.01 to 0.78, at 100–6300 Hz frequency surpassing the control OPC matrix as 0.02. The study results demonstrate the suitability of a porous geopolymeric matrix featuring larger voids and a stronger gel network as promising thermal insulation and noise reduction.