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Pro084-1

EARLY AGE PROPERTIES OF LOW PH CONCRETES



Author(s): T. Leung Pah Hang, T. Vidal, J. Verdier, X. Bourbon
Paper category: Proceedings
Book title: Proceedings of CONSEC13 Seventh International Conference on Concrete under Severe Conditions - Environment and Loading Volume I
Editor(s): Z.J. Li, W. Sun, C.W. Miao, K.Sakai, O.E. Gjørv, N.Banthia
ISBN: 978-2-35158-124-7
e-ISBN: 978-2-35158-134-6
Publisher: RILEM Publications SARL
Publication year: 2013
Pages: 153-164
Total Pages: 961
Language : English


Abstract: In the design of the French underground radioactive waste repository, sealings should be made with low permeability swelling clay, which will be held by plug made of concrete. Researches were carried out to design a new type of concrete in order to limit the chemical interactions between the clay and the concrete, low pH concrete. Two ternary binders showed promising results in that regard. The few data available on those materials in the literature led to a more complete mechanical study of these low pH concretes which is presented in this paper. The mechanical properties measured are the compressive strength, the splitting tensile strength, and the Young modulus. Moreover, the microstructure of low pH materials is also analyzed at different ages in order to link the microstructural change with evolutions of mechanical properties. To predict the long term behavior of those new types of materials, the hydration of each concrete is simulated with a multiphasic hydration model and the mechanical measurements are associated with the concrete degree of hydration. A single equation is then used to predict the evolutions of the different mechanical characteristics.


Online publication : 2013
Publication type : full_text
Public price (Euros) : 0.00


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