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The new LNEC specifications on reinforced concrete durability



Author(s): A. F. Gonçalves, A. B. Ribeiro, M. J. Esteves Ferreira
Paper category: Workshop
Book title: International RILEM Workshop on Integral Service Life Modelling of Concrete Structures
Editor(s): R.M. Ferreira, J. Gulikers, C. Andrade
Print ISBN: 978-2-35158-058-5
e-ISBN: 978-2-35158-090-5
Publisher: RILEM Publications SARL
Pages: 131 - 140
Total Pages: 10
Language: English


Abstract: 
The NP EN 206-1 establishes in its National Application Document that the LNEC Specifications E 464 and E 465 shall be applied when considering the durability of reinforced concrete.
The LNEC E 464 presents prescriptive requirement for concrete durability, similar to those presented informatively in EN 206-1, whilst the LNEC E 465 presents the statistical approach for durability presented by RILEM in 1996, by taking into account the EN 1990 – Eurocode. Basis of structural design.
The study of the performance properties of concretes produced with different binders such as resistance to carbonation and chloride migration coefficient, and of the compressive strength, has enabled the comparison of the requirements defined in both specifications for identical exposure conditions, and, for service lives of either 50 or 100 years.
For this purpose, the recommendations proposed by EN 1992-1-1 – Eurocode 2: Design of concrete structures. Part 1-1 – General rules and rules for buildings were taken into account, namely with regards to the reinforcement cover depth.

The general conclusion is that the “deemed to satisfy” requirements of LNEC E 464 are satisfactory for resistance to carbonation, regardless of the type of the binder.
The same is also true for the resistance to chlorides, however, only if CEM III, CEM IV or CEM V binders are used, or if similar mixtures of CEM I or CEM II/A with additions type II are used. Furthermore, when CEM I or CEM II/A cements are used, the application of complementary strategies is recommended, namely for exposure classes XS2/XD2 or XS3/XD3.


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


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