Abstract
This paper aims to investigate the influence of coal fly ash (CFA) addition on the fireproof properties of the metakaolin-based geopolymer foams. The physical properties, thermal conductivity and fire resistance of the CFA-metakaolin-based geopolymer foams are discussed. The CFA-metakaolin-based geopolymer foams achieve a dry density between 259.43 kg/m3 and 349.73 kg/m3, a porosity between 71.78% and 72.98%, a thermal conductivity between 0.0871 W/(m·K) and 0.0944 W/(m·K) and a compressive strength between 0.38 MPa and 0.56 MPa, exhibiting better physical properties than that of the porous blocks without CFA addition. It is also found that the CFA addition could decrease the viscous sintering temperature and change the phase compositions of sintering products, resulting in the porous structure deterioration in a certain extent and obvious rise of the final reverse-side temperature during the fire-resistance tests. Fortunately, the conversion of the amorphous geopolymer gel to ceramics has helped to maintain the main skeleton structure stability. The CFA-metakaolin-based geopolymer foams still exhibit excellent fire resistance, and the reverse-side temperatures are always within 250 °C after 3 h fire-resistance tests.
Highlights
Porous materials have been widely considered in the field of fire protection due to their low density, low thermal conductivity, and rapid installation [1,2]
Especially geopolymer foams (GFs), have attracted more and more attention owing to their light weight, non-toxic, and excellent high temperature resistance [6,7,8]
Amount of coal fly ash (CFA) varies from 0% to 12%, the porosity, mechanical strengths of the MK-based geopolymer foams have been promoted in a certain extent, while the dry density and thermal
Summary
Porous materials have been widely considered in the field of fire protection due to their low density, low thermal conductivity, and rapid installation [1,2]. Organic porous materials usually exhibit poor fireproof performance, and even produce toxic gases in the process of combustion, which has caused a number of fire accidents in China [3,4]. Especially geopolymer foams (GFs), have attracted more and more attention owing to their light weight, non-toxic, and excellent high temperature resistance [6,7,8]. With the advantages of high thermal stability, excellent freeze-thaw resistance, low production cost and CO2 emissions, geopolymers seem very suitable to prepare inorganic foam materials and show a promising future in the field of fire
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