Investigation on mechanical and microstructural properties of alkali-activated materials made of wood biomass ash and glass powder

Silva, Guilherme Jorge Brigolini; Santana, Vanessa Pereira; Wójcik, Marta

doi:10.1016/j.powtec.2020.09.048

Cited by 23 publications

(10 citation statements)

References 54 publications

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“…However, on the contrary, another study reported that compositions activated by Na 2 CO 3 show satisfactory setting time and compressive strength during 1–3 days of curing, reaching 5–25 MPa [ 71 , 72 ]. The activation potential of activators might be arranged in the following order [ 73 ]: Na 2 SiO 3 > NaOH > NaOH + Na 2 CO 3 > KOH.…”

Section: Introductionmentioning

confidence: 99%

Effects of Na2CO3/Na2SiO3 Ratio and Curing Temperature on the Structure Formation of Alkali-Activated High-Carbon Biomass Fly Ash Pastes

et al. 2022

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This study explored unprocessed high-carbon biomass fly ash (BFA) in alkali-activated materials (AAM) with less alkaline Na2CO3 as the activator. In this paper, the effects of the Na2CO3/Na2SiO3 (C/S) ratio and curing temperature (40 °C and 20 °C) on the setting time, structure formation, product synthesis, and physical-mechanical properties of alkali-activated BFA pastes were systematically investigated. Regardless of curing temperature, increasing the C/S ratio increased the density and compressive strength of the sample while a decrease in water absorption. The higher the curing temperature, the faster the structure evolution during the BFA-based alkaline activation synthesis process and the higher the sample’s compressive strength. According to XRD and TG/DTA analyses, the synthesis of gaylussite and C-S-H were observed in the sample with an increasing C/S ratio. The formation of the mentioned minerals contributes to the compressive strength growth of alkali-activated BFA pastes with higher C/S ratios. The findings of this study contribute to the applicability of difficult-to-recycle waste materials such as BFA and the development of sustainable BFA-based AAM.

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Section: Introductionmentioning

confidence: 99%

Effects of Na2CO3/Na2SiO3 Ratio and Curing Temperature on the Structure Formation of Alkali-Activated High-Carbon Biomass Fly Ash Pastes

et al. 2022

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“…Alkali-activated cementitious binders are based on a reaction of an aluminosilicate precursor with alkalis. The main reaction product of an alkali-activated system with high calcium is calcium(alumino)silicate hydrate gel [ 92 , 93 , 94 ]. Alkali-activated materials have been identified as a potential alternative to traditional Portland cement-based materials due to their reduced carbon footprint, higher strength, and superior durability properties [ 92 , 95 , 96 ].…”

Section: The Use Of Wood Ash In Alkali-activated Materialsmentioning

confidence: 99%

“…The main reaction product of an alkali-activated system with high calcium is calcium(alumino)silicate hydrate gel [ 92 , 93 , 94 ]. Alkali-activated materials have been identified as a potential alternative to traditional Portland cement-based materials due to their reduced carbon footprint, higher strength, and superior durability properties [ 92 , 95 , 96 ]. However, they typically require the addition of alkali activators, such as sodium silicate and sodium hydroxide, which may have negative environmental impacts [ 95 , 97 ].…”

Section: The Use Of Wood Ash In Alkali-activated Materialsmentioning

confidence: 99%

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Wood Ash as Sustainable Alternative Raw Material for the Production of Concrete—A Review

et al. 2023

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Different ecological binders have been used to minimize the negative effects of cement production and use on the environment. Wood ash is one of these alternative binders, and there has been increasing research related to this topic recently. The wood ash utilized in the literature primarily originates from power plants and local bakeries, and predominantly wood fly ash is used. This review paper examines the use of wood ash as an ecological binder in two different applications: as a cement replacement and as an alkali-activated material. Studies have shown that while increased wood ash content in concrete and mortars can have negative effects on strength and durability, it is still a promising and developable material. Depending on the chemical composition of the wood ash, the strength and durability properties of concrete might be slightly improved by utilizing wood ash as a replacement for cement, with an optimal replacement level of 10–20%. However, there is a need for more research regarding the effects of wood ash on the durability of cement-based materials and its use in alkali-activated materials. Overall, this review provides a comprehensive overview of the properties of wood ash and its potential applications in conventional concrete and mortars, as well as in alkali-activated materials.

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“…Nur [23] studied the effect of sintering temperature on the microstructure, phase analysis, and electrical conductivity of alkali-activated materials. Guilherme Jorge Brigolini Silva [30] and others have used biomass fly ash and glass powder as precursor materials to produce alkali-activated gel materials and found that, with the increase in NaOH concentration and the decrease in glass powder content, the compressive strength and the flexural strength showed improvements, but there was still larger porosity.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Mechanical and Microstructure Characteristics of Coal Gangue Road Stabilization Materials Based on Alkali Slag Cementation

Wang

Yang

2021

Materials

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To accelerate the resource utilization of coal gangue and meet the strategic requirements of carbon neutralization, alkali-activated, slag-cemented coal gangue is applied in the preparation of solid waste-based road stabilization materials. Here, the cementation characteristics and microstructure characteristics of alkali-activated, slag-cemented coal gangue road stabilization materials are studied using the alkali equivalent and coal gangue aggregate ratio as experimental variables. The results show that with the increase in alkali equivalent from 1% to 7%, the unconfined compressive strength of the alkali-activated coal gangue road stabilization material initially increases and then decreases, with 3% being the optimal group in terms of stabilization, the aggregate ratio of coal gangue increases from 70% to 85%, and the 7-day unconfined compressive strength of the stabilized material decreases approximately linearly from 8.16 to 1.68 MPa. At the same time, the porosity gradually increases but still meets the requirements of the specification. With the increase in hydration time, a large number of hydration products are formed in the alkali slag cementation system, and they are closely attached to the surface of and interweave with the coal gangue to fill the pores, resulting in the alkali slag slurry and coal gangue being brought closer together.

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Investigation on mechanical and microstructural properties of alkali-activated materials made of wood biomass ash and glass powder

Cited by 23 publications

References 54 publications

Effects of Na2CO3/Na2SiO3 Ratio and Curing Temperature on the Structure Formation of Alkali-Activated High-Carbon Biomass Fly Ash Pastes

Effects of Na2CO3/Na2SiO3 Ratio and Curing Temperature on the Structure Formation of Alkali-Activated High-Carbon Biomass Fly Ash Pastes

Wood Ash as Sustainable Alternative Raw Material for the Production of Concrete—A Review

Experimental Study of the Mechanical and Microstructure Characteristics of Coal Gangue Road Stabilization Materials Based on Alkali Slag Cementation

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