Low-velocity impact of hot-pressed PVA fiber-reinforced alkali-activated stone wool composites

Abstract

This study evaluates the effects of the manufacturing process and fiber reinforcement on low-velocity impact response of the recently developed PVA fiber-reinforced alkali-activated stone wool composites. To this end, reinforced and unreinforced specimens manufactured by hot-pressing were compared with those oven curing. The results revealed a similar impact response for the hot-pressed composite produced at 120 ° C for 3 h and its counterpart cured at ambient pressure at 60 ° C oven for 24 h. Furthermore, fiber reinforcement significantly improves the impact resistance of the hot-pressed composites showing about a 50% increase in peak load and a 40% reduction in penetration compared to the unreinforced materials. In view of the development of the hot-pressed composites and potential applications, accurate predictive models are of extremely importance, hence the material mechanical behavior was here simulated by adopting the concrete damage plasticity model to predict the low-velocity impact response of both unreinforced and reinforced materials and successfully verified for the scaling-up purpose.

Development of Sustainable Alkali-Activated Mortars Using Fe-Rich Fayalitic Slag as the Sole Solid Precursor

“…Researchers have explored the possibility of replacing PC partially or wholly with various cementitious industrial residues (Alex et al, 2016;Provis, 2018). One notable breakthrough is the development of alternative alkali-activated binders from industrial residues, such as ground granulated blast furnace slag (GGBFS), coal fly ash, and more recently, mineral wools (Mo et al, 2015;Zhao et al, 2015;Provis, 2018;Carvelli et al, 2020;Lemougna et al, 2020). While GGBFS and coal fly ash have been widely researched and successfully applied in alkali-activated cements and concrete, they are already utilized almost fully as supplementary cementitious material (SCM) (Scrivener et al, 2016).…”

Mineralogy and glass content of Fe‐rich fayalite slag size fractions and their effect on alkali activation and leaching of heavy metals

“…4,5 These precursors are mixed with alkali activators (such as alkali hydroxides and alkali silicates) either as one-part systems (i.e., a blend of solid precursor and solid activator, mixed with water), or two-part systems (solid precursor mixed with a liquidactivating solution) to produce mortars and concretes with superior or comparable properties to PC. 6,7 The development of AAMs using industrial residues has been reported to have numerous economic and environmental benefits, and this development would also comply with the European Union directive on waste management. 8 Blast furnace slag (BFS) is a type of inorganic industrial residue from metallurgical processes that have been extensively studied; it is frequently used in alkali-activated cements and concretes.…”

Optimization of the Effect of Hydraulic Hot-Pressing-Process Parameters on Tensile Properties of Kapok Fiber Nonwoven Web Based on Taguchi Experimental Design

“…It is important for selecting the control factors. Based on the literature review on the factors influencing the mechanical properties of nonwoven fiber and polymer [11,15,16], the selected process parameters at three levels were studied using an L27 orthogonal array (Table 3). A full factorial experimental design will require at least 27 × 5 = 135 combinations of runs, However, using Taguchi's factorial experiment approach reduces it to only 27 runs, significantly reducing the experimental cost and time.…”