INFLUENCE OF CARBONATION AND CONCRETE SPECIMEN SIZE ON GAS DIFFUSION COEFFICIENT

Author(s): Mouna Boumaaza(1), Bruno Huet(1), Philippe Turcry(2), Christoph Gehlen(3), Abdelkarim Aït-Mokhtar(2), Detlef Heinz(3) Paper category: Proceedings
Book title: SynerCrete’18 International Conference on Interdisciplinary Approaches for Cement-based Materials and Structural Concrete
Editor(s): Miguel Azenha, Dirk Schlicke, Farid Benboudjema, Agnieszka Jędrzejewska
ISBN: 978-2-35158-202-2
e-ISBN: 978-2-35158-203-9
Publisher: RILEM Publications SARL
Publication year: 2018
Pages: 919-924
Total Pages: 6
Language : English

Abstract: This paper investigates the effect of accelerated carbonation on the oxygen-effective diffusion coefficient (De,O2) of dry hardened cement pastes, non-carbonated and carbonated, at different hydration durations (for 1 day to 8 months); the influence of concrete specimen size (discs of 5, 10 and 50mm thickness) on De,O2 and compares De,O2 against oxygen permeability for 14 concrete mixes. The effect of concrete specimen size on oxygen diffusion coefficient is investigated on four concrete mixes hydrated for 90 days. Measurements are made after drying the specimens at 95%RH and 105°C. For each concrete mix: nine replicates of 5mm and 10mm thickness are tested at the dry state and after equilibration at 95%RH and three specimens of 50mm thickness are tested at the dry state only. Carbonation is found to influence De,O2 differently depending on the binder type. De,O2 varies slightly with the concrete specimen thickness, and no clear correlation is found between De,O2 and oxygen permeability.

Online publication : 2018
Publication type : full_text
Public price (Euros) : 0.00