HOW DOES THE SIZE OF AGGREGATES AFFECT PERMEABILITY OF DAMAGED CONCRETE?

Author(s): Marta Choinska (1), Stéphanie Bonnet (1), Aurélie Fabien (1, 2), Hayder Al-Khazraji (1, 3), Abdelhafid Khelidj (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: 713-718
Total Pages: 6
Language : English

Abstract: This experimental study concerns impact of aggregate size on mechanical behavior and gas permeability of concrete. The work has been carried out using three types of materials: a microconcrete, a concrete and a macroconcrete, all with the same water-to-cement ratio, as well as the same aggregate volume fraction. Specimens of the formulated materials have been submitted to controlled uniaxial compression cycles or to indirect tensile in the Brazilian splitting test, till certain damage levels. Gas permeability have then been measured on damaged specimens, after unloading for specimens loaded in compression, and during loading for specimens loaded in indirect tension. For the latter, a special lab-made device has been developed to control tensile loading in the pre-peak and the post-peak phases and to measure gas transfer during loading. For all the tested materials, the results emphasize that compressive and tensile strengths decrease and gas permeability increases, when aggregate size increases, independently on the cement type, CEM I or CEM III. Moreover, the obtained results highlight that the effects of tensile or compressive damage on permeability may be separated from the effects of aggregate size by two distinct functions. This behaviour, independent on cement type, represents a strong advantage for concrete modelling.

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