Performance of refractory aluminosilicate particle/fiber-reinforced geopolymer composites

A Novel MK-based Geopolymer Composite Activated with Rice Husk Ash and KOH: Performance at High Temperature

“…Furthermore, the addition of AF into the matrix increased the MOR by 36.43% and 9.93% for G-AF and G-AFRP, respectively. These results were much better than the results shown by Bernal et al (45); in this paper, the MOR value for sample G is 77% higher than that of the matrix tested in that investigation. The MOR value for G-CF was similar to the MOR shown by Zhang et al (60) for samples with 1% of CF.…”

“…Although MK-based geopolymers can exhibit structural stability at temperatures higher than 1000 °C, some reports show a remarkable loss of mechanical strength at temperatures below 300 °C as a consequence of the dehydration and dehydroxylation processes of the reaction products (53). The inclusion of fibres can curb this thermal shrinkage at temperatures between 200 °C and 500 °C, reducing the loss of mechanical strength and improving thermal stability (45,48). The inclusion of carbon fibres in geopolymers that have been exposed to 1400 °C under controlled atmosphere has been shown to lead to the formation of β-SiC, indicating that the C from the fibres can react with Si-O units from the reaction products (48).…”

“…Geopolymer composite materials reinforced with ceramic particles have also been assessed, and the inclusion of alumina, nanosilica, zirconia (49,50), quartz, granular inorganic fillers from demolition waste materials, and crushed refractory particles (45), increase geopolymer mechanical performance, especially under compressive loads (45,51,52). The inclusion of mineral reinforcements can also provide positive effects when the material is exposed to high temperatures, such as the retention of mechanical properties and cracking reduction.…”

“…By bridging cracks, a wide range of polymeric, mineral and natural fibres have been used to improve geopolymer tensile and flexural strength, toughness, and energy absorption capacities (35). Short fibres of polypropylene (PP) (36,37), polyvinyl alcohol (PVA) (38), basalt (39,40), glass (41,42), carbon (43,44), alumina (45,46) and steel (47) have been successfully incorporated into geopolymers at volume fractions between 0.5-3.5%. Higher fibre contents, up to 20% (44), provide more control over cracking and increase mechanical strength of the brittle matrix.…”

Preparation and mechanical performance of Cf-SiCf-(Al2O3p) reinforced geopolymer composites

“…However, the pure geopolymers showed disadvantages of both low mechanical performance and catastrophic fracture behavior, thus limits its applications as structural components [1][2][3][4][5][6][7]. In recent years, many studies have been explored on geopolymer matrix composites to overcome the disadvantages of itself low strength and brittle failure, including nanotube [8,9], graphene [10][11], particles [12][13], short fiber [14][15][16]20] and continuous fiber [17][18][19]. Ranjbar [19] evaluated fiber-matrix interaction and mechanical properties of two different fibers (polypropylene (PPF) and micro steel fibers (MSF)) reinforced fly ash based geopolymer.…”