Performance-based durability design and specification: overview of the South African approach
Author(s): M.G. Alexander, K. Stanish, Y. Ballim
Paper category: Workshop
Book title: International RILEM Workshop on Performance Based Evaluation and Indicators for Concrete Durability
Editor(s): V. Baroghel-Bouny, C. Andrade, R. Torrent, K. Scrivener
Pages: 197 - 206
Total Pages: 10
Over the last decade, an approach to improving the durability of reinforced concrete construction has been developed in South Africa. The philosophy involves the understanding that durability will be improved only when unambiguous measurements of appropriate cover concrete properties can be made. Such measurements must reflect the in situ properties of concrete, influenced by the dual aspects of material potential and construction quality. Key stages in formulating this approach were developing suitable test methods, characterising a range of concretes using these tests, studying in-situ concrete performance, and applying the results to practical construction.
The paper reviews the suite of test methods developed and their applicability to both lab and site concrete. The tests yield parameters, called 'durability indexes' that are linked to deterioration mechanisms. The durability indexes have been related empirically to service life prediction models. Index values can be used as the input parameters of service life models, together with other variables such as steel cover and environmental class, in order to determine rational design life. Limiting index values can be used in construction specifications to provide the necessary concrete quality for a required life and environment. Thus, a framework has been put in place for a performance-based approach to both design and specification. The paper also reviews practical applications of this approach in South African construction.
Online publication: 2007
Publication Type: full_text
Public price (Euros): 0.00