Effect of Nanosilica on Mechanical Properties and Microstructure of PVA Fiber-Reinforced Geopolymer Composite (PVA-FRGC)

Assaedi, Hasan; Alomayri, Thamer; Siddika, Ayesha; Shaikh, Faiz Uddin Ahmed; Alamri, Hatem R.; Subaer, Subaer; Low, It-Meng

doi:10.3390/ma12213624

Cited by 30 publications

(9 citation statements)

References 21 publications

(30 reference statements)

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“…The extraction of river sand causes a change in river bed level and hydrological strata, affecting the regular stream directions [ 1 , 2 , 3 ]. Furthermore, cement production requires substantial energy and emits a large amount of carbon dioxide [ 4 , 5 ]. It was reported that one ton of ordinary Portland cement (OPC) production can release around 0.85 ton of carbon dioxide, which ultimately causes around 5–8% of total emissions in the world [ 6 , 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

Waste Glass in Cement and Geopolymer Concretes: A Review on Durability and Challenges

et al. 2021

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Every year, the world is producing around 100 metric tons of waste glass (WG), the majority of them are going to landfills that create massive environmental problems. One approach to solve this problem is to transform waste glass into construction materials. Glass is recyclable; however, the melting temperature of the glass is highly dependent on its colour that requires sorting before recycling. To overcome this challenge, many researchers and end-users are using broken glass in concrete either as a binder or aggregates. While significant investigations have done in this area, however, the outcomes of these studies are scattered, and difficult to reach a firm conclusion about the effectiveness of WG in concrete. In this study, the roles of WG and its impact on microstructural and durability properties for both cement and geopolymer concrete are critically reviewed. This review reveals that the amorphous silica in WG effectively participate to the hydration and geopolymerization process and improve concrete microstructural properties. This behaviour of WG help to produce durable concrete against shrinkage, chemical attack, freeze-thaw action, electrical and thermal insulation properties. The optimum replacement volume of binders or natural aggregates and particle size of WG need to be selected carefully to minimise the possible alkali-silica reaction. This review discusses a wide range of parameters for durability properties and challenges associated with WG concrete, which provides necessary guidelines for best practice with future research directions.

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Section: Introductionmentioning

confidence: 99%

Waste Glass in Cement and Geopolymer Concretes: A Review on Durability and Challenges

et al. 2021

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“…Mining of natural river sand causes changes in the direction of river flows and alters hydrological strata and river bed levels [20]. In addition to cement production, concrete casting requires substantial energy, consumes natural limestone, and is responsible for 5-7% of the world's total carbon dioxide emissions [21][22][23][24][25][26]. Therefore, research on the appropriate and sustainable substitutions of natural and conventional ingredients in concrete is essential.…”

Section: Introductionmentioning

confidence: 99%

“…Geopolymers are a class of inorganic aluminosilicate-binding materials with an amorphous or semicrystalline three-dimensional structure [22]. The production of a geopolymer is associated with the reaction of aluminosilicate raw materials with alkaline activators, and therefore requires a substantial source of silica [24]. WG powder can be used as a precursor, fine aggregate, and activator in the production of cement-free geopolymer binders and geopolymer concretes [16,29,30].…”

Section: Introductionmentioning

confidence: 99%

Roles of Waste Glass and the Effect of Process Parameters on the Properties of Sustainable Cement and Geopolymer Concrete—A State-of-the-Art Review

et al. 2021

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Recent research has revealed the promising potential of using waste glass (WG) as a binder or inert filler in cement and geopolymer concrete to deliver economic and environmental benefits to the construction sector. However, the outcomes obtained by different research groups are scattered and difficult to compare directly because of isolated process parameters. In this study, the roles and impacts of WG and process parameters on the performance of WG-added cement and geopolymer concrete are critically reviewed. This study reveals that the chemical and mineralogical composition, and particle size of WG, mix proportion, activation, and curing condition of concrete are the most important parameters that affect the dissolution behavior of WG and chemical reactivity between WG and other elements in concrete; consequently, these show impacts on properties of concrete and optimum WG level for various applications. These parameters are required to be optimized based on the guidelines for high pozzolanicity and less alkali–silica reactivity of WG in concrete. This review provides a critical discussion and guidelines on these parameters and the chemistry of WG in cement and geopolymer concrete for best practice and highlights the current challenges with future research directions.

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“…The investigation of the effect of nanoparticles is not only crucial for the general improvement of geopolymer concrete but also has specific benefits for the development of fiber-reinforced geopolymer concrete. The combination of fibers and nanoparticles leads to reduced degradation of the fiber materials and results in better durability of the geopolymer composites [ 57 , 64 , 65 , 66 , 67 ]. Assaedi et al investigated the influence of the nano-silica content on the mechanical properties and durability of a geopolymer concrete reinforced with flax fibers [ 57 ].…”

Section: Natural Fibersmentioning

confidence: 99%

Natural Fiber-Stabilized Geopolymer Foams—A Review

et al. 2020

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The development of sustainable, environmentally friendly insulation materials with a reduced carbon footprint is attracting increased interest. One alternative to conventional insulation materials are foamed geopolymers. Similar to foamed concrete, the mechanical properties of geopolymer foams can also be improved by using fibers for reinforcement. This paper presents an overview of the latest research findings in the field of fiber-reinforced geopolymer foam concrete with special focus on natural fibers reinforcement. Furthermore, some basic and background information of natural fibers and geopolymer foams are reported. In most of the research, foams are produced either through chemical foaming with hydrogen peroxide or aluminum powder, or through mechanical foaming which includes a foaming agent. However, previous reviews have not sufficiently addresses the fabrication of geopolymer foams by syntactic foams. Finally, recent efforts to reduce the fiber degradation in geopolymer concrete are discussed along with challenges for natural fiber reinforced-geopolymer foam concrete.

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Effect of Nanosilica on Mechanical Properties and Microstructure of PVA Fiber-Reinforced Geopolymer Composite (PVA-FRGC)

Cited by 30 publications

References 21 publications

Waste Glass in Cement and Geopolymer Concretes: A Review on Durability and Challenges

Waste Glass in Cement and Geopolymer Concretes: A Review on Durability and Challenges

Roles of Waste Glass and the Effect of Process Parameters on the Properties of Sustainable Cement and Geopolymer Concrete—A State-of-the-Art Review

Natural Fiber-Stabilized Geopolymer Foams—A Review

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