The single and hybrid use of steel and basalt fibers on high‐temperature resistance of sustainable ultra‐high performance geopolymer cement mortars

Abstract

This paper primarily examines the flowability, physical appearance, mass loss, residual compressive strength (RCS), and residual flexural strength (RFS) properties of steel (ST) and basalt (BA) fiber-added sustainable ultra-high performance geopolymer cement (UHPGPC) mortars exposed to hightemperature effects. According to the results obtained, ST and BA fibers adversely influence the workability properties of UHPGPC mortars and thus significantly reduce the spreading diameters of the mortars. However, ST and BA fibers substantially improve the RCS and RFS capacities of UHPGPC specimens exposed to high temperatures because they have a powerful bonding effect with the matrix and effectually restrict the development of micro-and macro-cracks with their bridging effect. Furthermore, this phenomenon is slightly more effective in hybrid form than using ST and BA fibers.

Portland Cement-Based Grouts Enhanced with Basalt Fibers for Post-Tensioned Concrete Duct Filling

“…As expected, Portland cement grouts are prone to cracking, but cracking can be reduced by incorporating fibers into the mix [ 47 ], since they provide better control of matrix cracking [ 47 , 48 , 49 , 50 ]. Some authors report that basalt microfiber (BF) in its current state of development can improve concrete durability by preventing early microcracks due to plastic shrinkage, and this effect is attributed to the reduction of the magnitude of free shrinkage, since basalt microfibers have a powerful bonding effect with the matrix and effectively restrict the development of micro- and macrocracks with their bridging effect [ 22 , 38 , 51 , 52 ]. Moreover, it has been reported that the risk of cracking is more prominent when the w/c ratio is reduced in the mix [ 22 ].…”

Mechanical properties and life cycle assessment of sugarcane bagasse and corn cob ashes‐based geopolymer concrete to promote circular economy

“…[11][12][13][14] Geopolymers are inorganic polymers resulting from alkalination of an Al-Si-rich source material, forming tetrahedral polymeric structures. 15,16 The most common Al-Si source materials for geopolymer concrete synthesis are industrial wastes such as fly ash, silica fume, GGBFS etc. 17,18 The usage of waste materials in geopolymer concrete is an ideal solution to foster a circular economy in the concrete industry.…”

“…Another innovative solution to further mitigate CO 2 emissions amid an increase in concrete usage is to replace cement altogether with Alumino‐Silicate (Al‐Si) binders and develop a new type of concrete, that is, geopolymer concrete 11–14 . Geopolymers are inorganic polymers resulting from alkalination of an Al‐Si‐rich source material, forming tetrahedral polymeric structures 15,16 …”