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Natural and accelerated carbonation behaviour of high-volume fly ash (HVFA) mortar: Effects on internal moisture, microstructure and carbonated phase proportioning

  • Binders with large portions of carbon-intensive Portland cement replaced by supplementary cementitious materials (e.g. fly ash) are more susceptible to carbonation mainly due to their lower CO2 buffering capacity. This conclusion is usually drawn from accelerated experiments at elevated CO2 levels involving processes that seriously differ from natural carbonation. The resulting presence of H2O reactant in the pore system and the carbonated microstructure itself may be very different. In this paper, these phenomena were investigated for High-Volume Fly Ash (HVFA) mortar via carbonation tests at ±0.04% CO2 (natural carbonation), 1% CO2 and 10% CO2. Internal humidity sensor monitoring and 1H NMR relaxometry revealed the highest water vapour and liquid water contents after carbonation at 10% CO2. Carbonation at 10% CO2 results in a coarser pore structure than carbonation at 1% CO2, and this probably due to a higher degree of C–S–H carbonation.

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Metadaten
Author:Philip van den Heede, Charlotte ThielORCiD, Nele de Belie
DOI:https://doi.org/10.1016/j.cemconcomp.2020.103713
Parent Title (English):Cement and Concrete Composites
Publisher:Elsevier
Document Type:Article
Language:English
Year of first Publication:2020
Release Date:2022/06/22
Tag:1H NMR relaxometry; Carbonation; Mercury intrusion porosimetry; Moisture sensors; Multi-ring electrodes; Thermogravimetric analysis
Volume:113
Issue:October
Article Number:103713
Institutes:Fakultät Bauingenieurwesen
Fakultät Bauingenieurwesen / Labor für Baustoffe
Publication:Externe Publikationen
research focus:Gebäude und Infrastruktur
Licence (German):Keine Lizenz - Es gilt das deutsche Urheberrecht: § 53 UrhG