Service Communautaire d'Information sur la Recherche et le Développement - CORDIS

Modelling - life time evaluation

The test results from WP3 and the results of observations on in-service structures (WP2) were compared, enabling partners to project and assess the behaviour of the different HPC mixtures in the field. A correlation of these results with the laboratory studies was performed, leading to a summary of the durability behaviour of HPC mixtures against different exposure classes.
On the basis of this summary, degradation models were created and/or analysed. Differences between the HPC mixtures exposed to different climatic conditions were expected which supported the creation of models for describing the degradation processes.

Deterioration models included different damage mechanisms in dependence of the HPC mixtures and the exposure classes of EN 206, as follows:
- Freeze-thaw attack (-20°C)
- Freeze-thaw attack (-40°C)
- De-icing agent attack
- Acid attack
- Sulfate/seawater attack
- Cyclic temperature attack

These models can understand the degradation mechanisms of different HPC design concepts with the results being presented by figures and diagrams.

The estimation of mixtures with an improved resistance against different climatic conditions leads to the achievement of recommendations for the production of HPC with fixed limits for constituents and acceptance criteria due to exposure classes according to EN 206. These recommendations helped form the basis for lifetime prediction of HPC with respect to durability.
From the modelling results, guidelines were also provided regarding service life evaluation, classification to EN206 service class, and finally recommendations to industry for application of HPC.

Informations connexes

Reported by

Dyckerhoff AG
Dyckerhoffstrasse 7
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