Alkali-activated slag (AAS) paste: Correlation between durability and microstructural characteristics

Shariati, Mahdi; Shariati, Ali; Trung, Nguyen Thoi; Shoaei, Parham; Ameri, Farshad; Bahrami, Nasrollah; Zamanabadi, Saeid Narimani

doi:10.1016/j.conbuildmat.2020.120886

Cited by 88 publications

(14 citation statements)

References 67 publications

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“…Meanwhile, Shariati et al [ 123 ] concluded that the excess of OH − ions during the alkali activation process caused a negative influence, which resulted in higher crack appearance and weak paste structure formation ( Figure 2 ). In alkali-activated systems, increasing NaOH concentration increased the concentration of Na components, which could produce brittle samples once chemically bonded into the main structure of calcium silicate hydrate (C-S-H).…”

Section: Alkaline Activator Solutionmentioning

confidence: 99%

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Recent Developments in Steelmaking Industry and Potential Alkali Activated Based Steel Waste: A Comprehensive Review

et al. 2022

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The steel industry is responsible for one-third of all global industrial CO2 emissions, putting pressure on the industry to shift forward towards more environmentally friendly production methods. The metallurgical industry is under enormous pressure to reduce CO2 emissions as a result of growing environmental concerns about global warming. The reduction in CO2 emissions is normally fulfilled by recycling steel waste into alkali-activated cement. Numerous types of steel waste have been produced via three main production routes, including blast furnace, electric arc furnace, and basic oxygen furnace. To date, all of the steel waste has been incorporated into alkali activation system to enhance the properties. This review focuses on the current developments over the last ten years in the steelmaking industry. This work also summarizes the utilization of steel waste for improving cement properties through an alkali activation system. Finally, this work presents some future research opportunities with regard to the potential of steel waste to be utilized as an alkali-activated material.

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Section: Alkaline Activator Solutionmentioning

confidence: 99%

“… SEM images of AAS paste with various NaOH concentrations at different magnifications: ( a ) 8 M NaOH (500×), ( b ) 8 M NaOH (300×), ( c ) 12 M NaOH (500×), ( d ) 12 M NaOH (300×), ( e ) 16 M NaOH (500×) and ( f ) 16 M NaOH (300×) [ 123 ]. …”

Section: Figurementioning

confidence: 99%

Recent Developments in Steelmaking Industry and Potential Alkali Activated Based Steel Waste: A Comprehensive Review

et al. 2022

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“…Water absorption and water permeability is such a parameter which shows the transport way of water but also provide water resistance capacity of alkali activated binders and concretes. Researchers studied the influence of liquid alkali activator and use of silica fume (SF) on durability and microstructural properties of AASC pastes [49,[71][72][73][74][75]. The linear regression of porosity versus compressive is shown in Fig.…”

Section: Water Absorption and Water Permeabilitymentioning

confidence: 99%

Fresh mechanical and durability properties of alkali-activated fly ash-slag concrete: a review

Abhishek

Prashant

Kamath

et al. 2021

Innov. Infrastruct. Solut.

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This paper describes a review of the state-of-the-art research carried on the fresh and hardened properties of Alkali Activated Binders and Concretes. Though, many research have been carried out in the recent times on alkali activated binders, few key parameters still remain unattended, that restricts the commercial application of AAMs to the general construction activities. Fresh properties, mechanical strength and durability performance of Alkali activated concrete with various Alumino silicates as base materials is mentioned. An essential parameter of Alkali activated concrete is the concentration of alkaline solution on which various properties like mechanical strength, setting time and durability depends. Influence of wide range of concentrations from 6 to 16 M on these properties are studied and reported in this paper. This paper mainly concentrates on properties of readily available base materials such as Fly ash and Slag and the means to improve their performance through the use of various industrial and agro-based byproducts as additives. Problems pertaining to practical applicability of AAMs to general construction activities are also highlighted.

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“…Numerous studies investigated AASC durability [29,31,44,55] and the correlation between the durability and microstructural characteristics [56] containing NaOH as an alkaline activator. Potassium hydroxide (KOH) has always been a potential alternative for sodium hydroxide (NaOH) in alkali-activated concrete [12].…”

Section: Type Of Alkaline Activatormentioning

confidence: 99%

Mix Design Effects on the Durability of Alkali-Activated Slag Concrete in a Hydrochloric Acid Environment

2021

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Because of its high strength, energy reduction, and low environmental impact, researchers have encouraged considering alkali-activated slag concrete (AASC) as a potential alternative to conventional concrete. In this study, the impact of mix design parameters on the durability of AASC, made with ground granulated blast furnace slag and activated with different alkaline solutions (NaOH, KOH, and Na2SiO3) immersed up to six months in a hydrochloric acid bath with pH = 3, has been investigated. A total of 13 mix designs were made in a way that, in addition to the type of alkaline solution, considered three other parameters, namely the molarity of alkaline solutions, the weight ratio of alkaline solutions to slag, and the weight ratio of alkaline solutions to sodium silicate. Visual inspections displayed that the AASC samples almost remained intact after exposure to an HCl acid solution with pH = 3 for up to 6 months, while the OPC sample experienced deleterious deterioration. The results clearly show that AASC outperformed OPC concrete when it comes to durability in an HCl acid solution. The strength reduction and weight loss of AASC compared with OPC concrete were approximately one-tenth and one-fifth, respectively. The AASC samples containing potassium hydroxide showed a higher strength reduction and weight loss in the HCl acid solution than the samples made with sodium hydroxide.

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Alkali-activated slag (AAS) paste: Correlation between durability and microstructural characteristics

Cited by 88 publications

References 67 publications

Recent Developments in Steelmaking Industry and Potential Alkali Activated Based Steel Waste: A Comprehensive Review

Recent Developments in Steelmaking Industry and Potential Alkali Activated Based Steel Waste: A Comprehensive Review

Fresh mechanical and durability properties of alkali-activated fly ash-slag concrete: a review

Mix Design Effects on the Durability of Alkali-Activated Slag Concrete in a Hydrochloric Acid Environment

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