Flash calcination of kaolinite rich clay and impact of process conditions on the quality of the calcines: A way to reduce CO2 footprint from cement industry

Teklay, Abraham; Yin, Chungen; Rosendahl, Lasse

doi:10.1016/j.apenergy.2015.04.127

Cited by 44 publications

(12 citation statements)

References 31 publications

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“…To date, a large variety of products have been used as cementitious materials, with a wide range of chemical compositions, which are placed in a CaO-SiO 2 -Al 2 O 3 ternary phase diagram [13]. Although industrial by-products or waste (e.g., fly ashes and blast furnace slags) are widely used to replace part of the cement clinker, the availability of these SCMs is limited by their production as by-products of power plants or blast furnace industries [14,15]. Furthermore, their efficiency to replace clinker has been studied by previous researchers who have concluded that they cannot be considered a global alternative to cement [16].…”

Section: Introductionmentioning

confidence: 99%

Clay as a Sustainable Binder for Concrete—A Review

Mousavi

Bhojaraju²,

Ouellet-Plamondon

2021

Construction Materials

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The negative environmental impacts of Portland cement as a binder in the construction industry have created a growing impetus to develop sustainable alternative binders. Various types of clay have been considered as potential cement replacements. The impact of clays as cement replacement depends on the dosage and treatment methods. This paper presents a comprehensive review to determine the effects of different types of clay on the fresh and hardened properties of concrete mixtures by analyzing the experimental database reported by the literature, including raw, calcined, modified, nano, and organo. This study intends to show the process of optimizing the use of clay in concrete, the reason behind converting raw clay to modified types, and research gaps through a comparison study between different types of clays. The present review study shows that clay-based concrete mixtures have higher thixotropy and yield stress values, improving shape stability. This results in lower early-age shrinkage of the concrete. However, the high floc strength of clay-based concrete causes a reduction in flowability. Treatment methods of raw clay, such as calcination and nano-sized clay particles, improve concrete compressive strength. General results of the previous studies highlight that all types of clay investigated positively affect the resistance of concrete to environmental attack.

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Section: Introductionmentioning

confidence: 99%

Clay as a Sustainable Binder for Concrete—A Review

Mousavi

Bhojaraju²,

Ouellet-Plamondon

2021

Construction Materials

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“…Hydrogen peroxide reacts, evolving oxygen gas, which is entrapped in the paste, giving foamed structure. Equations (4) and (5)…”

Section: Foamed Geopolymer Concretementioning

confidence: 99%

“…Apart from this, a large amount of solid waste and gaseous emissions particularly CO 2 are produced [3]. Cement industry is considered to be one of the greenhouse gas (GHG) emitters [4]; 0.83 kg CO 2 is produced per kg cement production [5][6][7] leading to 8% of total global anthropogenic CO 2 emissions.…”

Section: Introductionmentioning

confidence: 99%

Fly Ash-Based Geopolymer Binder: A Future Construction Material

Singh

2018

Minerals

168

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A large amount of waste coming out from industries has posed a great challenge in its disposal and effect on the environment. Particularly fly ash, coming out from thermal power plants, which contains aluminosilicate minerals and creates a lot of environmental problems. In recent years, it has been found that geopolymer may give solutions to waste problems and environmental issues. Geopolymer is an inorganic polymer first introduced by Davidovits. Geopolymer concrete can be considered as an innovative and alternative material to traditional Portland cement concrete. Use of fly ash as a raw material minimizes the waste production of thermal power plants and protects the environment. Geopolymer concretes have high early strength and resistant to an aggressive atmosphere. Methods of preparation and characterization of fly ash-based geopolymers have been presented in this paper. The properties of geopolymer cement/mortar/concrete under different conditions have been highlighted. Fire resistance properties and 3D printing technology have also been discussed.

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“…Also more advanced technologies based on electrofragmentation or microwave heating are being investigated as a means to upgrade residues to SCMs [41][42][43]. Finally, a range of pyrometallurgical treatments, such as (flash) calcination [44], incineration or plasma treatments [45] are being considered as means to recover valuables (e.g. molten metals), remove undesirable components (e.g.…”

Section: Unlocking Scms By Beneficiation and Activationmentioning

confidence: 99%

Assessing, Understanding and Unlocking Supplementary Cementitious Materials

Snellings

2016

RILEM Tech Lett

232

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The partial replacement of Portland clinker by supplementary cementitious materials (SCM) is one of the most popular and effective measures to reduce both costs and CO2 emissions related to cement production. An estimated 800 Mt/y of blast furnace slags, fly ashes and other materials are currently being used as SCM, but still the cement industry accounts for 5-8% of global CO2 emissions. If no further actions are taken, by the year 2050 this share might even rise beyond 25%. There is thus a clear challenge as to how emissions will be kept at bay and sustainability targets set by international commitments and policy documents will be met. Part of the solution will be a further roll-out of blended cements in which SCMs constitute the main part of the binder to which activators such as Portland cement are added. Since supply concerns are being raised for conventional high-quality SCMs it is clear that new materials and beneficiation technologies will need to step in to achieve further progress. This paper presents opportunities and challenges for new SCMs and demonstrates how advances towards more powerful and reliable characterisation techniques help to better understand and exploit SCM reactivity.

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Flash calcination of kaolinite rich clay and impact of process conditions on the quality of the calcines: A way to reduce CO2 footprint from cement industry

Cited by 44 publications

References 31 publications

Clay as a Sustainable Binder for Concrete—A Review

Clay as a Sustainable Binder for Concrete—A Review

Fly Ash-Based Geopolymer Binder: A Future Construction Material

Assessing, Understanding and Unlocking Supplementary Cementitious Materials

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