Coupling effect and durability in cement pastes and concretes with supplementary cementitious materials

Author(s): Mickael Saillio, Matthieu Bertin, Veronique Baroghel-Bouny
Paper category: Proceedings
Book title: Proceedings of the International Conference on Sustainable Materials Systems and Structures (SMSS2019) Durability, Monitoring and Repair of Structures
Editor(s): Ana Baričević, Marija Jelčić Rukavina, Domagoj Damjanović, Maurizio Guadagnini
ISBN: 978-2-35158-217-6
e-ISBN: 978-2-35158-218-3
Publisher: RILEM Publications SARL
Publication year: 2019
Pages: 436-443
Total Pages: 848
Language: English

Abstract: The main cause of deterioration of reinforced concrete structures is the corrosion of steel bars, induced by chloride ions (for example in marine environment) and/or by carbonation (atmospheric CO2). In addition, drying in early age of concrete hydration can also modify the durability of concrete and especially for concrete mixed with supplementary cementitious materials (SCM). Carbonation, chloride and drying of hydrated cementitious materials are usually studied separately in the literature.
In this paper, few coupling effects are investigated. In particular, chloride ingress are studied for concretes and cement pastes partially carbonated. In addition, the effects of coupling between drying and carbonation are also studied. The mixtures contain CEM I alone or substituted by SCM such as Fly Ash, Metakaolin or Ground Granulated Blast furnace Slag.
The results show that chloride ingress is faster when the material is partially carbonated before contact with chloride solution. Finally, results show also that carbonation kinetics of CEM I pastes are not impacted by curing time whereas carbonation kinetics of CEM I with GGBS pastes and concretes are.

Online publication :2019
Publication type : full_text
Public price (Euros) : 00