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In hot, dry climates, the thermal mass of masonry walls can be beneficial, absorbing heat during the day and releasing it at night, thereby stabilizing indoor temperatures. However, in most other climates, additional insulation is necessary to enhance thermal resistance.
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When freshly poured concrete is exposed to freezing temperatures before it has set, the water within the concrete can freeze. This expansion disrupts the setting process, delays chemical reactions necessary for hardening, and increases the volume of pores within the hardened concrete, which weakens its overall structure. If the concrete manages to reach an appreciable strength before it freezes, the damage can be somewhat mitigated.
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  11. Study On Freeze-thaw Cycle Performance And Regional Service Life Prediction Of Hydrophobic Aerogel-modified Aceps Boards

Study on Freeze-Thaw Cycle Performance and Regional Service Life Prediction of Hydrophobic Aerogel-Modified ACEPS Boards

Lu Lu1,2, Rongyu Chen3, Mingming Wang4

  • 1Jiangsu Provincial Engineering Laboratory for Advanced Materials of Salt Chemical Industry, Huaiyin Institute of Technology, Huai'an 223003, China.

Materials (Basel, Switzerland)
|June 13, 2025

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View abstract on PubMed

Summary
This summary is machine-generated.

Hydrophobic aerogel enhances cement-based expanded polystyrene (EPS) insulation boards (ACEPS boards) by reducing water absorption and improving freeze-thaw resistance. This leads to better durability and extended service life for building insulation in cold climates.

Area of Science:

  • Building Materials Science
  • Materials Chemistry
  • Thermal Engineering

Background:

  • Expanded polystyrene (EPS) insulation boards are widely used but susceptible to degradation under freeze-thaw cycles (FTCs).
  • Incorporating hydrophobic additives can potentially enhance the durability and performance of EPS-based materials.
  • Aerogels, known for their unique properties, offer potential for advanced insulation materials.

Purpose of the Study:

  • To investigate the impact of hydrophobic aerogel on the performance of aerogel cement-based expanded polystyrene (EPS) insulation boards (ACEPS boards) subjected to FTCs.
  • To analyze the effects of varying aerogel content on key material properties.
  • To predict the service life of ACEPS boards in diverse climate zones.

Main Methods:

  • Systematic freeze-thaw cycle (FTC) testing was performed on ACEPS boards with varying aerogel content.
Keywords:
external wall insulation materialsfreeze–thaw cyclesfreeze–thaw resistancehydrophobic aerogel

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  • Measurements included compressive strength, volumetric water absorption, thermal conductivity, and pore structure analysis.
  • Service life prediction was conducted for four distinct climate zones.

    • Main Results:

    • Aerogel significantly reduced volumetric water absorption in ACEPS boards due to its hydrophobicity.
    • Compressive strength attenuation decreased from 40% to 24%, and thermal conductivity increase was suppressed from 0.0130 to 0.0055 W/(m·K).
    • Aerogel modification notably improved freeze-thaw resistance and mitigated pore structure degradation, especially in high aerogel content specimens.

    Conclusions:

    • Hydrophobic aerogel incorporation enhances the structural and functional durability of EPS insulation boards against freeze-thaw cycles.
    • ACEPS boards demonstrate improved performance in cold climates (Harbin, Urumqi) and areas with high FTC frequency (Beijing).
    • This research provides a basis for optimizing aerogel-based insulation materials for cold regions.
    service life prediction