Clinkering-free cementation by fly ash carbonation

Wei, Zhenhua; Wang, Bu; Falzone, Gabriel; Plante, Erika Callagon La; Okoronkwo, Monday Uchenna; She, Zhenyu; Oey, Tandré; Balonis, Magdalena; Neithalath, Narayanan; Pilon, Laurent; Sant, Gaurav

doi:10.1016/j.jcou.2017.11.005

Cited by 67 publications

(55 citation statements)

References 54 publications

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“…This suggests that CO 2 uptake capacity mainly depends on the presence of reactive, alkaline compounds, i.e. Ca‐ and Mg‐bearing compounds that can react with CO 2 . Carbon dioxide uptake is also related to the water content in concrete.…”

Section: Introductionmentioning

confidence: 99%

“…Compressive strength plays one of the most important roles in the use performance of building materials. The extent of strength development in cementitious materials after carbonation curing is significant, especially in the early stages . Some explanations for carbonation strengthening have been proposed in the literature.…”

Section: Introductionmentioning

confidence: 99%

“…found that C‐S‐H, a cement hydration product, is modified by carbonates due to the increased linear chains integrated with calcium carbonates . When exposed to CO 2 for a long period of time, C‐S‐H would gradually decompose to calcite and hydrous silica, which have themselves been noted to offer cementation . From the perspective of the effect of microstructure on mechanical strength, two mechanisms have been mentioned in previous research: (i) binding, which means that a carbonate network is formed to bind particles to each other, e.g.…”

Section: Introductionmentioning

confidence: 99%

“…From the perspective of the effect of microstructure on mechanical strength, two mechanisms have been mentioned in previous research: (i) binding, which means that a carbonate network is formed to bind particles to each other, e.g. the mollusks and shells, and (ii) densification, which means carbonates fill the microstructures to make them dense . It is reported that the carbonation reaction occurs not only in the capillary pores in matured cement but also at the interfacial transition zone between the hydrated C‐S‐H and the unreacted particles.…”

Section: Introductionmentioning

confidence: 99%

“…Ca-and Mg-bearing compounds that can react with CO 2 . 8 Carbon dioxide uptake is also related to the water content in concrete. Excessively high or low water-to-cement ratios will inhibit the carbonation reactions.…”

Section: Introductionmentioning

confidence: 99%

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Carbonation curing of industrial solid waste‐based aerated concretes

et al. 2019

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Mineral carbonation for concrete curing is a promising route to large‐scale CO2 sequestration and the economic production of building materials. In this work, the carbonation curing of a kind of lightweight concrete, aerated concrete, was comprehensively studied. Three typical industrial wastes – fly ash, blast furnace slag, and red mud – were employed to replace part of the cement and to reduce the carbon footprint of products. The effects of carbonation curing time, pressure, and water‐to‐solids ratio on the CO2 uptake and compressive strength were investigated. Aerated concrete with red mud showed the highest CO2 uptake capacity, followed by concrete with fly ash, and concrete with blast furnace slag. The main crystalline carbonation products, needle‐like calcite and rod‐like aragonite, were observed to be embedded in the surface of fly ash and blast‐furnace‐slag‐based specimens. The orderly structures of carbonated crystals, as well as the reduction of mesoscale porosity (< 50 nm), resulted in an enhancement of mechanical properties. For red‐mud‐based specimens, calcite crystals with the appearance of grains (smaller than 1μm) were formed due to deeper carbonation. The rapid growth of calcite grains may lead to cracks from inside red‐mud‐based specimens and cause a negative effect on mechanical properties. In terms of mechanical performance, the blast furnace slag specimens, after carbonation curing, exhibited the largest compressive strength of 7.3 MPa, which was over 197% higher than that of natural curing for the same duration. © 2019 Society of Chemical Industry and John Wiley & Sons, Ltd.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Carbonation curing of industrial solid waste‐based aerated concretes

et al. 2019

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New insights into the mechanisms of carbon dioxide mineralization by portlandite

et al. 2021

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Portlandite (Ca(OH)2; also known as calcium hydroxide or hydrated lime), an archetypal alkaline solid, interacts with carbon dioxide (CO2) via a classic acid–base “carbonation” reaction to produce a salt (calcium carbonate: CaCO3) that functions as a low‐carbon cementation agent, and water. Herein, we revisit the effects of reaction temperature, relative humidity (RH), and CO2 concentration on the carbonation of portlandite in the form of finely divided particulates and compacted monoliths. Special focus is paid to uncover the influences of the moisture state (i.e., the presence of adsorbed and/or liquid water), moisture content and the surface area‐to‐volume ratio (sa/v, mm−1) of reactants on the extent of carbonation. In general, increasing RH more significantly impacts the rate and thermodynamics of carbonation reactions, leading to high(er) conversion regardless of prior exposure history. This mitigated the effects (if any) of allegedly denser, less porous carbonate surface layers formed at lower RH. In monolithic compacts, microstructural (i.e., mass‐transfer) constraints particularly hindered the progress of carbonation due to pore blocking by liquid water in compacts with limited surface area to volume ratios. These mechanistic insights into portlandite's carbonation inform processing routes for the production of cementation agents that seek to utilize CO2 borne in dilute (≤30 mol%) post‐combustion flue gas streams.

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Utilization of mineral carbonation products: current state and potential

et al. 2019

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Mineral carbonation (MC) is a form of carbon capture and storage that reacts CO2 with alkaline feedstock to securely store CO2 as solid carbonate minerals. To improve process economics and accelerate commercial deployment, research has increased around product utilization, where markets exist primarily in the construction industry. This review assesses the potential for advancing MC product utilization to decrease CO2 emissions toward neutral, or even negative, values. First, the literature surrounding the current state and challenges for indirect MC processes is reviewed, indicating that process intensification and scale‐up are important areas for further research. Alkalinity sources available for MC are examined, differentiating between those sourced from industrial processes and mining operations. Investigation of possible end uses of carbonate products reveals that further CO2 avoidance can be achieved by replacing conventional carbon‐intensive products. Companies that are currently commercializing MC processes are categorized based on the feed used and materials produced. An analysis of company process types indicates that up to 3 GtCO2 year–1 could be avoided globally. It is suggested that upcoming commercial efforts should focus on the carbonation of industrial wastes located near CO2 sources to produce precast concrete blocks. Carbonation of conventional concrete shows the highest potential for CO2 avoidance, but may face some market resistance. Carbonation of Mg silicates lacks sufficient market demand and requires the development of new high‐value products to overcome the expense of mining and feed preparation. It is suggested that research focus on enhanced understanding of magnesia cement chemistry and the development of flame‐retardant mineral fillers. © 2019 The Authors. Greenhouse Gases: Science and Technology published by Society of Chemical Industry and John Wiley & Sons, Ltd.

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Clinkering-free cementation by fly ash carbonation

Cited by 67 publications

References 54 publications

Carbonation curing of industrial solid waste‐based aerated concretes

Carbonation curing of industrial solid waste‐based aerated concretes

New insights into the mechanisms of carbon dioxide mineralization by portlandite

Utilization of mineral carbonation products: current state and potential

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