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Sulphate Attack on Concrete-Mechanisms and Prediction Model

Title: Sulphate Attack on Concrete-Mechanisms and Prediction Model
Author(s): M. Fenchel, H.S. Müller
Paper category : conference
Book title: International RILEM Conference on Material Science
Editor(s): W. Brameshuber
Print-ISBN: 978-2-35158-108-7
e-ISBN: 978-2-35158-109-4
Publisher: RILEM Publications SARL
Publication year: 2010
Pages: 229 - 238
Total Pages: 10
Nb references: 9
Language: English

Abstract: The attack of sulfate bearing water on cementitious materials contains a great destructive potential. While previous studies mainly described the encountered phenomena, this research project focuses on a quantitative description of the deterioration process with the intention to deduce a simplified analytical model to predict strength, deformation and crack behavior of concrete under sulfate attack.

An essential part of the analytical-numerical approach consists in the separate analysis of processes on the micro, meso and macro level. Describing the hardened cement paste as a heterogeneous continuum with dispersed pores, the resulting stresses and cracks due to ettringite formation are simulated using fracture mechanics. Further numerical models for concrete are developed, taking into account the influence of aggregates and corrosion front induced strain gradients on the concrete damage. Related experimental investigations deliver the necessary characteristic values and provide also a basis for the validation of the model. The derivation of a simplified analytical prediction model for sulfate attack and its consequences on concrete complete the research study.

Such a model can aid substantially in the design and construction of concrete members exposed to sulfate attack and help forecasting the service life of members under such actions.
It is a key part of an overall service life design, which will be a part of future code generations.

Online publication: 2010-12-02
Publication type : full_text
Public price (Euros): 0.00

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