SCALE EFFECT ON ALKALI-SILICA REACTION

Author(s): Jacques Jabbour (1) (2) (3), Aveline Darquennes (2), Loic Divet (3), Rachid Bennacer (2), Jean-Michel Torrenti (3), Georges Nahas (1)
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: 773-778
Total Pages: 6
Language : English

Abstract: Many laboratory studies of internal swelling reactions are realized on relatively small size samples. Those laboratory samples do not allow to reproduce real conditions to which is submitted the real concrete in its environment, in terms of kinetics, volume/surface ratio, thermal and mechanical conditions especially in massive structures. Therefore, an experimental protocol to accelerate internal swelling reactions of concrete on a structural scale has been developed to allow better observation and understanding of swelling reactions at structure scale. A representative massive concrete structure (2.4 x 1.4 x 1 m3 ) was realized under controlled and optimized conditions for the development of alkali silica reaction (ASR). The scale effect on swelling kinetics is demonstrated by an experimental study comparing the evolution of swelling reaction in the massive sample with the evolution in reconstituted concrete laboratory specimens as well as coring specimens. Results show different swelling kinetics and amplitude in function of sample type, size and boundary conditions.

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