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Evaluation of methods for testing concrete degradation in aggressive solutions

Title: Evaluation of methods for testing concrete degradation in aggressive solutions
Author(s): N. De Belie
Paper category : conference
Book title: Workshop on Performance of Cement-based Materials in Aggressive Aqueous Environments - Characterisation, Modelling, Test Methods and Engineering Aspects
Editor(s): Nele De Belie
Print-ISBN: None
e-ISBN: 978-2-35158-059-2
Publisher: RILEM Publications SARL
Publication year: 2008
Pages: 79 - 90
Total Pages: 12
Nb references: 26
Language: English

Abstract: In order to characterise and rate relative performance of different cement-based materials in aggressive aqueous environments, reliable and reproducible test methods are necessary. Important is of course the aggressive environment one wants to simulate, which will determine the chemical and/or microbiological degradation mechanism, and the type of aggressive substances involved. Mostly considerations concerning available time and budget will guide the choice between small scale laboratory tests, large scale simulation tests and in situ tests. This choice will have a considerable effect on the test results, since it may affect different factors influencing the degradation rate or even the degradation mechanism. Different parameters which are adjusted in order to mimic the real-life situation more closely, or to accelerate the degradation and obtain results more rapidly, will influence the test results. These parameters include pH and concentration of the solution, physical state, temperature, rate of replenishment, mechanical action, alternate wetting and drying, alternate heating and cooling, pressure, etc. These parameters should be carefully selected and should always be reported together with test results. Also the choice of degradation measure may lead to different conclusions regarding relative performance of concrete types. Often a combination of multiple relevant indicators will be necessary. Furthermore sample preparation procedures and the concrete age at the time of testing are of utmost importance.

Online publication: 2008-06-05
Classification: Keynote paper
Publication type : full_text
Public price (Euros): 0.00

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