Effects of fiber length on mechanical properties and fracture behavior of short carbon fiber reinforced geopolymer matrix composites

Characterisation of mechanical and thermal properties in flax fabric reinforced geopolymer composites

“…Despite their desirable characteristics, geopolymer matrices suffer from brittle failure under applied force and demonstrate low flexural strength ranging between 1.7 and 16.8 MPa [6,7]. Improving their flexural and tensile strengths will significantly increase the application of these materials in the construction and building industries; and this may be accomplished by dispersing inorganic or organic fibres throughout the matrices.…”

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

“…There was no obvious difference between the composites with and without Al 2 O 3 particles. As for the composites, fiber fracturing and lots of fiber pulling-out could be seen on the fracture surface, which were due to the weak bonding strength between the fiber and the geopolymer matrix [14,27]. They are all helpful to consume much higher fracture energy and enhance the fracture toughness of the composites [14,27].…”

“…As for the composites, fiber fracturing and lots of fiber pulling-out could be seen on the fracture surface, which were due to the weak bonding strength between the fiber and the geopolymer matrix [14,27]. They are all helpful to consume much higher fracture energy and enhance the fracture toughness of the composites [14,27]. This ensured the effective toughening and could prevent the catastrophic fracture of the composites, which make the composites presents typical non-catastrophic behavior.…”

“…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.…”

“…Timakul et al [20] reported the addition of basalt fibers into the fly ash-based geopolymer can improve its compressive strength. Lin et al [14,[21][22] prepared the short carbon fiber geopolymer matrix composites using sheetlike fiber preform, and improved the mechanical properties. The addition of α-Al 2 O 3 particles into the composites could reduce the volume change of the composites and improve the mechanical properties, especially at high temperatures [22].…”