Geopolymer binders from metakaolin using sodium waterglass from waste glass and rice husk ash as alternative activators: A comparative study

Tchakouté, Hervé K.; Rüscher, Claus H.; Kong, Sakéo; Kamseu, Elie; Leonelli, Cristina

doi:10.1016/j.conbuildmat.2016.03.184

Cited by 239 publications

(123 citation statements)

References 34 publications

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“…Concrete samples containing GFG showed no major change in workability compared to control samples. [168][169][170][171][172][173][174] Similar findings were also observed in other studies, indicating that the use of foam glass could adversely affect the properties of lightweight concrete due to ASR expansion.…”

Section: Glass-based Productssupporting

confidence: 86%

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Waste glass in civil engineering applications—A review

Kazmi

Williams

Serati

2019

Int J Applied Ceramic Tech

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Each year, hundreds of thousands of tons of industrial wastes are being stockpiled, landfilled, and disposed of in storages occupying large areas of land that would otherwise be available for productive use. Recycling of such wastes is now becoming of urgent global interest due to an increasing population, the rise in anthropogenic activities, and the need for more efficient resource and waste management systems.Among many wastes, the generation of glass is dramatically increasing, particularly in the municipal, industrial, and construction sectors. In civil engineering, in general, crushed waste glass has been mainly investigated as a substitute for sand and finegrained aggregate in concrete production. In geotechnical engineering, in particular, the application of glass wastes is mainly limited to road pavements or as an additive to different soils for subgrade improvement. While glass wastes are relatively inert and potentially offer several opportunities for recycling as a substitute for diminishing and increasingly expensive sand supplies, their potential use yet remains relatively under-researched. This paper systematically reviews the current status of knowledge on the use of glass wastes in various civil engineering applications and discusses the suitability assessment of waste glass for use as a sustainable alternative to traditional civil engineering materials. K E Y W O R D Saggregate, concrete, recycling, sand, waste glass, waste management

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Section: Glass-based Productssupporting

confidence: 86%

“…Similarly, other studies have also demonstrated that glass-rich geopolymers prepared by coupling CWG and other wastes could potentially be used in a variety of civil engineering applications. [168][169][170][171][172][173][174]…”

Section: Glass-based Productsmentioning

confidence: 99%

Waste glass in civil engineering applications—A review

Kazmi

Williams

Serati

2019

Int J Applied Ceramic Tech

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“…When MK was activated under alkaline conditions to form a geopolymer, the main bands at wavenumbers of 1007 and 1015 cm −1 shifted in both the GP and GP-G mortar spectra; this band corresponded to the asymmetric vibration of the Si-OT bonds in the GP gel potassium aluminum silicate hydrates (KASH) (where T corresponds to Si or Al tetrahedrons) [45]. According to Tchakouté et al [46], the infrared absorption bands at wavenumbers close to 1100 cm −1 and 950 cm −1 could indicate that the geopolymers contained more SiQ 3 and SiQ 2 species, respectively. Additionally, the band observed in the GP-G mortar spectrum was more intense than that observed in the GP spectrum, indicating the presence of more undissolved silica in the alkaline system [43].…”

Section: Physicochemical and Microstructural Characterization Of The mentioning

confidence: 99%

Evaluation of the Antibacterial Activity of a Geopolymer Mortar Based on Metakaolin Supplemented with TiO2 and CuO Particles Using Glass Waste as Fine Aggregate

et al. 2020

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Metakaolin-based geopolymer cements were produced by alkaline activation with a potassium hydroxide and potassium silicate solution. To produce the geopolymer composites, 10 wt.% titanium oxide (TiO 2 ) and 5 wt.% copper oxide (CuO) nanoparticles were used. The geopolymer mortar was prepared using glass waste as fine aggregate. The raw materials and materials produced were characterized by X-ray diffraction, electron microscopy, and Fourier-transform infrared spectroscopy techniques. Likewise, the geopolymer samples were characterized to determine their physical properties, including their density, porosity, and absorption. The photocatalytic activity of the materials was evaluated by activating the nanoparticles in a chamber with UV-Vis light during 24 h; then, different tests were performed to determine the growth inhibition of Staphylococcus aureus, Escherichia coli, and Pseudomonas aeruginosa bacteria in nutrient agar for times of up to 24 h. The study results showed that a geopolymer mortar containing glass waste as fine aggregate (GP-G) exhibited a water absorption 56.73% lower than that of the reference geopolymer paste without glass (GP). Likewise, glass particles allowed the material to have a smoother and more homogeneous surface. The pore volume and density of the GP-G were 37.97% lower and 40.36% higher, respectively, than those of the GP. The study with bacteria showed that, after 24 h in the culture media, the GP-G mortars exhibited a high inhibition capacity for the growth of P. aeruginosa from solutions of 10 −4 mL and in solutions of 10 −6 mL for E. coli and S. aureus. These results indicate the possibility of generating antibacterial surfaces by applying geopolymer composite.

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“…Several studies have shown that amorphous silica-rich materials may be used as alternative alkaline activators to produce AAM (Bernal et al, 2012), such as silica fume (Rouseková et al, 1997;Bajza et al, 1998;Živica, 1999, 2004, 2006Bernal et al, 2012;Rodríguez et al, 2013), rice husk ash (Bernal et al, 2012;Kamseu et al, 2017), and waste glass (Puertas and Torres-Carrasco, 2014;Torres-Carrasco and Puertas, 2015;Tchakouté et al, 2016;Vafaei and Allahverdi, 2017). Those materials may be both economically and environmentally advantageous when compared to commercially available SS solutions.…”

Section: Introductionmentioning

confidence: 99%

Silica Fume as Precursor in the Development of Sustainable and High-Performance MK-Based Alkali-Activated Materials Reinforced With Short PVA Fibers

et al. 2019

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Alkali-activated materials (AAM) are currently the subject of increasing interest and research, mainly due to the possibility of reducing the carbon dioxide (CO 2 ) emissions in their production when compared to Portland cement (PC) and still achieve superior performance in many aspects when compared to traditional PC-based products. However, the use of sodium silicate (SS) as an alkaline activator in AAM is controversial when the aim is to reduce the environmental impact, as the production of the first also releases significant amount of CO 2 per ton of activator produced. Therefore, a demand has emerged for alternative silica-rich materials that could effectively reduce the demand for SS without compromising the mechanical behavior of the matrices and consequently the performance of fiber reinforced AAM. This paper investigates the gradual replacement (0-18% wt.) of metakaolin (MK) with silica fume (SF) in PVA-reinforced AAM, allowing the reduction of SS in the activator, also containing NaOH. Matrices with different composition were studied, i.e., with [SiO 2 ]/[Al 2 O 3 ] molar ratios of 3.0 and 3.8. All formulations were reinforced with 2% vol. of PVA fibers. The mechanical properties investigated were compressive strength, modulus of elasticity, flexural strength, and toughness. Apparent dry density, water absorption, and porosity of the composites were also assessed to give an indication of their durability. Single fiber pullout, fracture toughness, and direct tensile tests were also carried out in order to understand the deformation capability of the composites. Results indicated that the employment of SF may effectively reduce the demand for SS in the alkaline activators, in order to produce alkali-activated composites with lower environmental impact (reduced CO 2 emissions). Adjustments in the formulations may improve toughness in flexion in 170% with 30 wt.% reduction of SS in the activator, as well as improvements in deformation capability in tension. The development of strain-hardening MK-based AAM, however, has some challenging aspects that are also discussed.

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Geopolymer binders from metakaolin using sodium waterglass from waste glass and rice husk ash as alternative activators: A comparative study

Cited by 239 publications

References 34 publications

Waste glass in civil engineering applications—A review

Waste glass in civil engineering applications—A review

Evaluation of the Antibacterial Activity of a Geopolymer Mortar Based on Metakaolin Supplemented with TiO2 and CuO Particles Using Glass Waste as Fine Aggregate

Silica Fume as Precursor in the Development of Sustainable and High-Performance MK-Based Alkali-Activated Materials Reinforced With Short PVA Fibers

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