Preparation and Fireproof Performance of  Geopolymer Lightweight Fire Resistant Coating

doi:10.16552/j.cnki.issn1001-1625.2024.1621

Abstract

Abstract: Steel structures are widely used in modern architecture, but under high-temperature fire environment, the mechanical properties of steel structure will be rapidly lost, which may cause severe casualties and properties losses, so it is vital to protect steel structures from fire. In this study, metakaolin-based geopolymer lightweight fire resistant coating (referred to as fire resistant coating) was prepared by using metakaolin and slag as raw materials, 1.5-mode potassium water glass as alkaline activator, hydrogen peroxide solution as foaming agent, MnO₂ as catalyst, and sodium oleate as form stabilization agent. The effect of content of hydrogen peroxide solution on the dry density, thermal conductivity, porosity, compressive strength, and adhesive strength of fire resistant coatings was investigated, and the fire resistance limit test was performed to examine the practical fireproof performance of the fire resistant coating. Micro-CT was employed to perform a comparative analysis of the pore structure in specimens before and after fire resistance limit test. And XRD, TG-DSC, and SEM-EDX were employed to characterize the phase transformation and microstructure evolution of the samples during high-temperature fire, elucidating the fire resistance mechanism. The results indicate that when the content of hydrogen peroxide solution is 1.5% (mass fraction), the dry density, compressive strength, and adhesive strength of sample are all better than the requirements of “Fire resistive coating for steel structure” (GB 14907—2018) and the thermal conductivity is as low as 0.132 W/(m·K).When the coating thickness of the fire resistant coating is 15 mm and the content of hydrogen peroxide solution is 1.5% (mass fraction), the back temperature of sample steel plate is 162 ℃ after 120 min fire resistance test under 1 300 ℃ flame, which has excellent fireproof resistance. During the fire resistance limit test, the ceramization transformation on the surface of the fire retardant coating, which reduces the damage of the flame to the internal pore structure and contributes to the fireproof performance of the fire retardant coating. The fire resistant coating undergoes ceramization transformation at high-temperature to form multiphase heat-resistance ceramics, which improves the fire resistance of the fire resistant coating.

Key words: geopolymer lightweight fire resistant coating, pore structure, thermal conductivity, adhesive strength, fire resistance limit

CLC Number:

TU545

ZHU Yiyang, GENG Haining, LI Zonggang, MA Haosen, LUO Yang, CHEN Wei, LI Qiu. Preparation and Fireproof Performance of Geopolymer Lightweight Fire Resistant Coating[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(8): 3049-3060.

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Preparation and Fireproof Performance of Geopolymer Lightweight Fire Resistant Coating

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