Journal
EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING
Volume 23, Issue 2, Pages 172-192Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/19648189.2016.1271364
Keywords
cement hydration; drying; carbonation; porosity; Portlandite content; liquid water saturation degree; fly ash; blast-furnace slag
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Funding
- French Research National Agency (ANR)
- Communaute d'Agglomeration de La Rochelle
- Belgian National Foundation for Scientific Research (FNRS)
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This paper presents a numerical study of the coupling between cement hydration and drying of concretes with high amount of fly ash or blast-furnace slag and concretes with Portland cement or blended cements. The study, conducted with the MLS by FEMMASSEA (R) code, aims at assessing the influence of drying on concrete properties governing carbonation kinetics, i.e. porosity, Portlandite content and liquid water saturation degree. These properties were found not uniform according to the depth within the concrete material. In the cover zone, high substitution concrete should have a higher carbonation risk than Portland cement concrete because of the slow hydration kinetics combined with the suspending effects of drying on hydration. Therefore, high substitution concrete should require a longer period of curing than Portland cement-based concretes.
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