Microstructural densification and CO2 uptake promoted by the carbonation curing of belite-rich Portland cement

Jang, Jeong Gook; Lee, Haeng‐Ki

doi:10.1016/j.cemconres.2016.01.001

Cited by 274 publications

(75 citation statements)

References 28 publications

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“…The capillary porosity and connectivity of the capillary pores in a porous medium can be thought as the most important factors influencing the diffusivity within the material [25,26].…”

Section: Characteristics Of the Pore Structure Of Bindermentioning

confidence: 99%

Physical barrier effect of geopolymeric waste form on diffusivity of cesium and strontium

Jang

Park

2016

Journal of Hazardous Materials

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“…The capillary porosity and connectivity of the capillary pores in a porous medium can be thought as the most important factors influencing the diffusivity within the material [25,26].…”

Section: Characteristics Of the Pore Structure Of Bindermentioning

confidence: 99%

Physical barrier effect of geopolymeric waste form on diffusivity of cesium and strontium

Jang

Park

2016

Journal of Hazardous Materials

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“…The significance of these issues has been documented by monitoring air pollution [37][38][39]. Using carbonation curing of cement-based materials during the preparation of building materials has attracted wide attention [40][41][42][43]. Similarly, CO 2 uptake within the carbonation of MOC phases can be beneficially used both from an environmental point of view, and in improving the performances of MOC-based materials.…”

Section: Introductionmentioning

confidence: 99%

Carbon Dioxide Uptake by MOC-Based Materials

et al. 2020

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In this work, carbon dioxide uptake by magnesium oxychloride cement (MOC) based materials is described. Both thermodynamically stable magnesium oxychloride phases with stoichiometry 3Mg(OH)2∙MgCl2∙8H2O (Phase 3) and 5Mg(OH)2∙MgCl2∙8H2O (Phase 5) were prepared. X-ray diffraction (XRD) measurements were performed to confirm the purity of the studied phases after 7, 50, 100, 150, 200, and 250 days. Due to carbonation, chlorartinite was formed on the surface of the examined samples. The Rietveld analysis was performed to calculate the phase composition and evaluate the kinetics of carbonation. The SEM micrographs of the sample surfaces were compared with those of the bulk to prove XRD results. Both MOC phases exhibited fast mineral carbonation and high maximum theoretical values of CO2 uptake capacity. The materials based on MOC cement can thus find use in applications where a higher concentration of CO2 in the environment is expected (e.g., in flooring systems and wall panels), where they can partially mitigate the harmful effects of CO2 on indoor air quality and contribute to the sustainability of the construction industry by means of reducing the carbon footprints of alternative building materials and reducing CO2 concentrations in the environment overall.

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“…Microstructural densification of pores with the diameter of 50 nm to 10 μm significantly develops strength. 14 Monkman and Shao also associated compressive strength enhancement with the accelerating effect of temperature rise on hydration in the exothermic carbonation process. 15 Due to the costly cement production process, alkaline industrial wastes for CO 2 mineralization are receiving more attention as supplementary cementitious materials in concrete.…”

Section: Introductionmentioning

confidence: 96%

“…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. Microstructural densification of pores with the diameter of 50 nm to 10 μm significantly develops strength . Monkman and Shao also associated compressive strength enhancement with the accelerating effect of temperature rise on hydration in the exothermic carbonation process …”

Section: Introductionmentioning

confidence: 96%

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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Microstructural densification and CO2 uptake promoted by the carbonation curing of belite-rich Portland cement

Cited by 274 publications

References 28 publications

Physical barrier effect of geopolymeric waste form on diffusivity of cesium and strontium

Physical barrier effect of geopolymeric waste form on diffusivity of cesium and strontium

Carbon Dioxide Uptake by MOC-Based Materials

Carbonation curing of industrial solid waste‐based aerated concretes

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