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Recent modelling advances to predict early-age behaviour and prevent induced disorders in concrete structures

Author(s): A. Sellier, L. Buffo-Lacarrière, S. Multon, M. Salgues, P. Souyis and B. Kolani
Paper category: conference
Book title: Crack Control of Mass Concrete and Related Issues concerning Early-Age of Concrete Structures
Editor(s): F. Toutlemonde and J.-M. Torrenti
Print ISBN: 978-2-35158-125-4
e-ISBN: 978-2-35158-126-1
Publisher: RILEM Publications SARL
Publication year: 2012
Pages: 11 - 20
Total Pages: 10
Language: English

Abstract: Sustainable development, economic considerations and technologic reasons lead to adopt more and more often blended cement for massive concrete structures. Most of the time slags are used combined or not with silica fume or fly ash. Hydration processes of these mixes are more complex than for single clinker cement. In fact activation energy is different for additions and clinker: so, the hydration kinetics of each component depends on the temperature during hydration. At high temperature addition reactions are more activated than clinker, consequently the Portlandite created during clinker hydration is consumed more quickly, and the Ca/Si ratio of its C-S-H increases with temperature while portlandite amount decreases. So, in large structures, hydration products, and consequently mechanical behaviour, are different in the core than near the edge due to the difference of temperature of this zone during hydration. This paper focus on the particularity of models developed in LMDC Toulouse to take into account this aspect in order to predict early age poro mechanics behaviour of concrete as well as long term induced consequences.

Online publication: 2012-07-20
Publication Type: full_text
Public price (Euros): 0.00

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