Abstract
Geopolymers were produced using an environmentally friendly alkali activator (based on Rice Husk Ash and potassium hydroxide). Aluminosilicates particles, carbon and ceramic fibres were used as reinforcement materials. The effects of reinforcement materials on the flexural strength, linear-shrinkage, thermophysical properties and microstructure of the geopolymers at room and high temperature (1200 ÅãC) were studied. The results indicated that the toughness of the composites is increased 110.4% for geopolymer reinforced by ceramic fibres (G-AF) at room temperature. The presence of particles improved the flexural behaviour 265% for geopolymer reinforced by carbon fibres and particles after exposure to 1200 .C. Linear-shrinkage for geopolymer reinforced by ceramic fibres and particles and the geopolymer G-AF compared with reference sample (without fibres and particles) is improved by 27.88% and 7.88% respectively at 900 ÅãC. The geopolymer materials developed in this work are porous materials with low thermal conductivity and good mechanical properties with potential thermal insulation applications for building applications.
Highlights
RESUMEN: Nuevo material compuesto de matriz geopolimérica activado con ceniza de cascarilla de arroz y KOH: Desempeño a alta temperatura
Comparing the different silica sources (G and KS) the open porosity was found to be higher in G, this is due to the higher hydration energy associated with the smaller particles of rice husk ash (RHA) [9, 57]
Comparing the geopolymers G-AFRP with the reference sample based on RHA (G), the open porosity was found to be lower for G-AFRP due to the presence of refractory particles (RP) reduces the porosity of the sample
Summary
RESUMEN: Nuevo material compuesto de matriz geopolimérica activado con ceniza de cascarilla de arroz y KOH: Desempeño a alta temperatura. In recent years there has been great interest for the use of alternative sources of amorphous reactive silica for producing alkaline activators: rice husk ash [3, 4, 9,10,11,12,13,14,15,16,17], silica fume [2, 3, 18,19,20,21] and waste glasses [1, 22,23,24,25] have been used and have shown similar microstructure and mechanical performance to geopolymers produced with commercial soluble silicate solutions [3, 9, 18, 26, 27]. The structural densification and subsequent formation of leucite-type structures in MK-based geopolymers activated with K-silicate and exposed to temperatures higher than 900 °C can promote the development of advanced ceramics that exhibit considerably high flexural strength (> 100 MPa) [54]
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