Chemical activation of slag-blended Portland cement

Allahverdi, Ali; Maleki, Afsaneh; Mahinroosta, Mostafa

doi:10.1016/j.jobe.2018.03.004

Cited by 58 publications

(13 citation statements)

References 24 publications

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“…Thermal activation involves purposeful heat treatment, with and without additives, to increase the amount of crystalline phases in solidified slags. To date, extensive studies have highlighted the benefits of activation of slags for use in the adsorption of cations and anions from industrial effluents and wastewaters [42,57,[59][60][61][62][63][64][65][66]139,140]. In particular, Yang et al [139] investigated the effect of nitrate removal by thermally activated steelmaking slags mixed with Al(OH) 3 .…”

Section: Thermal Activationmentioning

confidence: 99%

“…Mechanochemical activation uses mechanical energy to promote the rate of reaction in physicochemical processes. It involves the compound effects of particle fracture and other bulk and surface physicochemical changes [140][141][142][143][144]. The adsorption capacity of slags can thus be enhanced by the finer particles, physicochemical activation, and the higher specific surface area arising from mechanochemically induced dislocations and other defects [59,65,140,142,144].…”

Section: Mechanochemical Activationmentioning

confidence: 99%

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Ironmaking and Steelmaking Slags as Sustainable Adsorbents for Industrial Effluents and Wastewater Treatment: A Critical Review of Properties, Performance, Challenges and Opportunities

et al. 2020

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This paper critically discusses the structure, properties and applications of ironmaking and steelmaking slags and their silicate-based variants as low-cost adsorbents for removing cations and anions from industrial effluents and wastewater. Undoubtedly, the performance of slag-based adsorbents depends on their physical, chemical and phase chemical properties. The presence of crystalline phases, for example, has a significant effect on the adsorption capacity. However, despite their low cost and ubiquity, their chemical and geometric heterogeneity significantly affects the performance and applications of slag-based adsorbents. These challenges notwithstanding, the efficacy of slag-based adsorbents can be significantly enhanced through purposeful activation to increase the specific surface area and density of adsorption sites on the surfaces of adsorbent particles. The synthesis of functionalised adsorbents such as geopolymers, zeolites and layered double hydroxides from silicate and aluminosilicate precursors can also significantly increase the performance of slag-based adsorbents. In addition, the ability to stabilise the dissolved and/or entrained toxic metal species in stable phases in slags, either through controlled post-process fluxing or crystallisation, can significantly enhance the environmental performance of slag-based adsorbents. Most critical in the design of future slag-based adsorbents is the integration of the engineered properties of molten and solidified slags to the recovery and stabilisation of dissolved and/or entrained metals.

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Section: Thermal Activationmentioning

confidence: 99%

Section: Mechanochemical Activationmentioning

confidence: 99%

Ironmaking and Steelmaking Slags as Sustainable Adsorbents for Industrial Effluents and Wastewater Treatment: A Critical Review of Properties, Performance, Challenges and Opportunities

et al. 2020

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“…In the utilization of waste can be compared to the other waste such as cement slag. Cement slag is a chemical reaction as one of popular activation method which is considered to fix hydraulic characteristic of the slag [8]. Recent studies have shown that mixing granular ground furnace slag with low calcium fly ash has a significant effect on the regulation and development of the initial strength of the system preserved at room temperature [9].…”

Section: Literature Reviewmentioning

confidence: 99%

The Efficiency of Fly Ash and Cement Slag to Development Building

Hidayawanti¹

2019

GEOMATE

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In world construction, the construction of high-rise buildings almost entirely uses concrete. This study uses fly ash and cement slag as a cement substitute as a reduction in cement requirements. This is due to the limited amount of cement in the market and the binding function of cement and the increasing cement prices. The use of fly ash and cement slag is toxic hazardous waste material that must be handled so that it can be used properly. From the results of the age strength of concrete 1-3 days, the compressive strength of fly ash is higher than that of cement slag but from a mixture of 28 days, it reaches 100% in accordance with the specified standard. In this laboratory test for the use of fly ash and slag cement, 50%, in the future it is necessary to research that the use of fly ash and slag cement can be up to 70% so that the use of fly ash material and cement slag can replace the function of concrete mixed cement as a binder of coarse and fine material to get concrete compressive strength with specified standards. Production costs can be minimized so that if this applied can avoid the company from potential billions/year losses.

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“…Obviously, many investigations are being focused on how to improve the reactivity of these SCMs. The main choices are: (i) Mechanical activation (Knop and Peled, 2016;Liu et al, 2018) (controlling the particle size distribution); (ii) Thermal activation (Vizcaíno-Andrés et al, 2015;Scrivener et al, 2018b) (especially for calcined clays-LC3 technology-); (iii) Chemical activation (Ruiz-Santaquiteria et al, 2013;Allahverdia and Malekia Mahinroosta, 2018) ("alkaline activated cement"). It is quite probable that future will lead to us to a combination of those options above mentioned like the most effective choice.…”

Section: Introductionmentioning

confidence: 99%

Studies About the Hydration of Hybrid “Alkaline-Belite” Cement

2019

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The mechanical performance of a hybrid cement containing 48% fly ash, 48% mineralized belite clinker, 1. 5% gypsum and 2.5% Na 2 SO 4 was analyzed and the hydration products were identified. The findings showed that the newly designed cement met European standard EN 197-1 compositional, mechanical and setting time requirements (cement type IVB). The hydration products forming in this blended "alkaline-belite" cement (as it was determined through XRD, 29 Si and 27 Al MAS NMR and electron microscopy) consisted in a mix of cementitious gels: C-(A)-S-H and N-(C)-AS -H, which interacted and over time evolved toward the latter with no detriment to the mechanical strength developed by the cement.

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Chemical activation of slag-blended Portland cement

Cited by 58 publications

References 24 publications

Ironmaking and Steelmaking Slags as Sustainable Adsorbents for Industrial Effluents and Wastewater Treatment: A Critical Review of Properties, Performance, Challenges and Opportunities

Ironmaking and Steelmaking Slags as Sustainable Adsorbents for Industrial Effluents and Wastewater Treatment: A Critical Review of Properties, Performance, Challenges and Opportunities

The Efficiency of Fly Ash and Cement Slag to Development Building

Studies About the Hydration of Hybrid “Alkaline-Belite” Cement

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