Synthesis of calcined kaolin-based geopolymer foam: Assessment of mechanical properties, thermal insulation, and elevated temperature stability

Matalkah, Faris; Ababneh, Ayman; Aqel, Ruba

doi:10.1016/j.ceramint.2022.11.174

Cited by 21 publications

(1 citation statement)

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“…Porosity depends on various factors: the type and concentration of foaming and stabilizing additives, as well as the temperature-time curing mode [5]. The most common and easily accessible foaming agents are hydrogen peroxide (H 2 O 2 ) with concentrations ranging from 3 to 35% [36,37], and metal powders [38]. Other agents are also utilized: for example, aluminum powder (Al) [39], silicon carbide (SiC) [40], microsilica [41], sodium perborate (NaBO 3 ) [42], etc.…”

Section: Introductionmentioning

confidence: 99%

Study on the Curing and Foaming of Surfactant-Modified Geopolymer Gels Based on Ash and Slag Waste from Coal Combustion

Yatsenko,

Trofimov,

Goltsman

et al. 2023

Gels

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This study explores the influence of temperature–time conditions, surfactants, and varied waste compositions on the curing of geopolymer gels, a foam formation with the properties of porous geopolymers. Findings reveal that a 6 h curing period leads to a density of 435 kg/m3 and strength of 0.66 MPa, with notable improvements at 12 h. Comparing 12 to 24 h curing, differences in characteristics remain within 5%, highlighting the 12 h period as more energy-efficient. Sodium stearate-based samples exhibit excellent properties, significantly boosting strength while maintaining overall properties. Microwave curing achieves the lowest density (291 kg/m3) and closely parallels properties of samples cured conventionally for 12 h. However, it leads to complete destruction in sodium stearate-modified gels due to the Dumas reaction, making it unsuitable above 200 °C. Optimal properties emerge from compositions using sodium stearate and oven curing, achieving densities of 334 kg/m3 and strengths of 1.08 MPa (Severodvinsk CHPP-1) and 373 kg/m3 and 1.17 MPa (Novocherkassk SDPP). Although microwave curing allows for high energy efficiency, its high temperature demands necessitate careful material selection. This study offers insight into enhancing geopolymer properties while emphasizing the importance of tailored curing methods for sustainable material development.

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