Alkali-Activated Cement-Based Binders (AACBs) as Durable and Cost-Competitive Low-CO2 Binder Materials

Pacheco-Torgal, F.; Abdollahnejad, Zahra; Miraldo, Sérgio; Kheradmand, Mohammad

doi:10.1016/b978-0-12-804524-4.00009-9

Cited by 28 publications

(12 citation statements)

References 52 publications

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“…Among others RM causes: (i) contamination of water resources with caustic soda and metallic oxide-bearing impurities; (ii) direct contact with fauna and flora; Figure 2. Calculation scheme for the amount of alumina and red mud that turn out during alumina refinery using chemical and mineralogical data [12].…”

Section: Red Mudmentioning

confidence: 99%

“…The schema below illustrates the reactions proposed for the polycondensation process [12]. In the reactions (8) The general empirical formula of geopolymer is as follows:…”

Section: Concept and Chemical Mechanism Of Geopolymerizationmentioning

confidence: 99%

“…Geopolymers durability is the most important issue in determining the success of these new materials. The fact that samples that have been exposed to service conditions for in excess of 30 years show little degradation means that geopolymers do therefore appear to stand the test of time [12]. Since those samples were of the (Si + Ca) type conclusion cannot be extended to geopolymers defined as alkali aluminosilicate gel, with aluminum and silicon linked in a tetrahedral gel framework.…”

Section: Durabilitymentioning

confidence: 99%

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Survey of Bauxite Resources, Alumina Industry and the Prospects of the Production of Geopolymer Composites from the Resulting by-product

Traoré¹,

Diarra²,

Kourouma³

et al. 2020

Geopolymers and Other Geosynthetics

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Guinea is endowed with huge mineral resources. Several geological surveys have identified bauxite, iron, gold, diamond, and several metal ores. Because of the diversity and the magnitude of its resources, the country is referred to as a geological scandal. Nowadays the aluminum industry is still at the quarrying stage of bauxite, the main raw material that is converted into alumina and further to aluminum. Approximately 35-40% of the processed bauxite ore goes into the waste as alkaline red mud RM slurry which consists of 15-40% solids. RM and other industrial wastes material such as fly ash FA, rice husk ash RHA, that poses environmental hazards can be mixed to make them apt for usage in engineering applications. Geopolymers GP represent a new class of materials consisting of Al 2 O 3 ▬SiO 2-based material suitable for several engineering application. The present chapter presents the bauxitic potential of Guinea, the subsequent developing alumina industry. It reviews the application of RM for the production of geopolymer materials in the perspective of the valorization of the huge bauxite potential of Guinea.

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Section: Red Mudmentioning

confidence: 99%

“…The schema below illustrates the reactions proposed for the polycondensation process [12]. In the reactions (8) The general empirical formula of geopolymer is as follows:…”

Section: Concept and Chemical Mechanism Of Geopolymerizationmentioning

confidence: 99%

Section: Durabilitymentioning

confidence: 99%

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Survey of Bauxite Resources, Alumina Industry and the Prospects of the Production of Geopolymer Composites from the Resulting by-product

Traoré¹,

Diarra²,

Kourouma³

et al. 2020

Geopolymers and Other Geosynthetics

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“…Waste glass is also a waste that is generated in relevant quantities and that merits increased recycling efforts. The use of waste glass in alkaliactivated binders is especially interesting because its high SiO 2 content allows for a reduction in the content of sodium silicate thus reducing the cost of this binder which constitutes one of the shortcomings of alkali-activated materials (Pacheco-Torgal et al, 2016). This justified recent studies on alkali-activated materials containing waste glass (Martinez-Lopez and Escalante-Garcia, 2016;Wang et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Carbon dioxide sequestration of fly ash alkaline based mortars with recycled aggregates and different sodium hydroxide concentrations

Mastali

Abdollahnejad

Pacheco-Torgal

2018

Carbon Dioxide Sequestration in Cementitious Construction Materials

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“…In Hong Kong, approximately 373 tons of waste glass was generated daily in 2010. The use of waste glass in alkali-activated binders is especially interesting because its high SiO 2 content allows for a reduction in the content of sodium silicate thus reducing the cost of this binder which constitutes one of the shortcomings of alkali-activated materials (Pacheco-Torgal et al, 2016). This justified recent studies on alkali-activated materials containing waste glass (Martinez-Lopez and Escalante-Garcia, 2016;Wang et al, 2016).…”

mentioning

confidence: 99%

Carbon dioxide sequestration on fly ash/waste glassalkali-based mortars with recycled aggregates

Mastali

Abdollahnejad

Pacheco-Torgal

2018

Carbon Dioxide Sequestration in Cementitious Construction Materials

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Carbon dioxide sequestration is crucial for limiting global warming (Hansen et al., 2017). That is why carbon sequestration constitutes one of the Grande Challenges of Engineering (Mote et al., 2016). Currently this carbon sequestration is carried out mostly through geologic CO 2 storage in saline aquifers (Zhang and Huisingh, 2017). However, that constitutes a passive strategy, involves huge risks, and also comes with a very high cost. Carbon capture and storage from the stream of concentrated CO 2 at fossil fuel burning sites like power plants or steel plants is more efficient and thus less expensive than direct air capture (Hansen et al., 2017). Several authors (Bertos et al., 2004; Jang et al., 2016) have studied the use of CO 2 for accelerated curing of cementitious construction materials. This technology will in future not only minimize release of carbon dioxide into the atmosphere but also accelerate curing and strength development of those materials. However, so far no studies were performed on alkali-based materials. These materials are produced through the reaction of an aluminosilicate powder (precursor) with an alkaline activator, usually composed by hydroxide, silicate, carbonate, or sulfate leading to the formation of an amorphous aluminosilicate gel and secondary nanocrystalline zeolite-like structures (Provis, 2014). These materials have a particular ability for the reuse of several types of wastes (Pay a et al., 2014; Bernal et al., 2016). Some wastes like fly ash (FA) deserve a special attention because they are generated in large amount and have a very low reuse rate. USA has a reuse rate for FA of around 50%, meaning that Carbon Dioxide Sequestration in Cementitious Construction Materials

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Alkali-Activated Cement-Based Binders (AACBs) as Durable and Cost-Competitive Low-CO2 Binder Materials

Cited by 28 publications

References 52 publications

Survey of Bauxite Resources, Alumina Industry and the Prospects of the Production of Geopolymer Composites from the Resulting by-product

Survey of Bauxite Resources, Alumina Industry and the Prospects of the Production of Geopolymer Composites from the Resulting by-product

Carbon dioxide sequestration of fly ash alkaline based mortars with recycled aggregates and different sodium hydroxide concentrations

Carbon dioxide sequestration on fly ash/waste glassalkali-based mortars with recycled aggregates

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