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Gas diffusion in cementitious materials: test methods review

Author(s): Fabien Gendron, Mouna Boumaaza, Philippe Turcry, Bruno Huet, Abdelkarim Aït-Mokhtar
Paper category: Proceedings
Book title: SynerCrete’18: Interdisciplinary Approaches for Cement-based Materials and Structural Concrete: Synergizing Expertise and Bridging Scales of Space and Time Vol. 1 & 2
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: 207-212
Total Pages: 6
Language : English

Abstract: The durability of reinforced concrete structures is strongly related to phenomena controlled by gas or liquid diffusion. Thus, gas diffusivity of concrete is a relevant durability indicator especially for carbonation induced corrosion. However, there is so far no standard procedure for the determination of this property. In the present paper, the main existing procedures for gas diffusion are first described. Two newly developed test methods are then presented. These procedures, which involve either CO2 or O2, consist in assessing the gas diffusivity from an unsteady state diffusion. These diffusion tests are compared through results from a campaign carried out on oven-dried cement pastes made with OPC and a mix of blast furnace slag and OPC. All the so-determined diffusivities are finally compared to data from literature. The main challenge of such a comparison is to find diffusivity values obtained for the same type of materials at equal hydric state. It is concluded that round robin tests would be of great interest for the future development of gas diffusion tests.

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

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