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Use of performance specification and predictive model for concretes exposed to a marine environment

Sree Nanukuttan ; P.A. Muhammed Basheer ; N. Holmes ; Luping Tang (Institutionen för bygg- och miljöteknik, Byggnadsteknologi) ; John McCarter
Structural Faults and Repair Conference 2010, 15-17 June 2010, Edinburgh, Scotland Vol. CDROM (2010), p. 12.
[Konferensbidrag, refereegranskat]

The factors affecting longevity of concrete structures can be taken into account whilst designing appropriate concrete mixtures. Existing guidelines in BS 8500 allow design of concrete mixtures for different exposure classes mainly based on the severity of the surrounding environment and service life. These guidelines specify the variables such as compressive strength, maximum water to binder ratio, minimum cement content and minimum cover thickness. Due to the very prescriptive nature of these guidelines they do not take into account concrete performance in any given environment. This can be overcome by giving emphasis to durability based designs that supplement the existing guidelines in BS 8500, by specifying the required performance of concrete in terms of measurable properties such as resistance to environmental penetrations. This paper reports an approach for developing performance-based specifications for concretes exposed to marine environments. Firstly, a critical review of the test methods for assessing the chloride penetration resistance of concrete is given. The repeatability of the different test results is also included. In addition to the test methods, a numerical simulation model is used to explore the test data further to obtain long-term chloride ingress trends. The combined use of testing and modelling is validated with the help of long-term data from a North Sea exposure site. Based on the results presented, an approach for developing performance specifications is outlined.

Nyckelord: Chloride, concrete, diffusion, durability



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Denna post skapades 2010-12-23. Senast ändrad 2017-03-21.
CPL Pubid: 131765

 

Institutioner (Chalmers)

Institutionen för bygg- och miljöteknik, Byggnadsteknologi (2005-2017)

Ämnesområden

Building Futures
Materialvetenskap
Byggnadsteknik
Konstruktionsmaterial

Chalmers infrastruktur