Wspólnotowy Serwis Informacyjny Badan i Rozwoju - CORDIS

Laboratory test results - HPC under frost attack

This result included the study of all involved mixtures under pure frost as well as under combined deicing agent attack, simulated by accelerated test methods. For the simulation two reliable test procedures have been used - the CDF/CIF- and Slab-test. By using these test methods the reduction of the relative dynamic modulus of elasticity or length change for internal damage, the continuous water uptake as well as the scaling rate were determined. Therefore, the results could clearly show the influence of the wide range of different constituents on the frost resistance of HPC. Dependencies of the different mixture compositions on the internal damage parameters as well as surface scaling could be also clearly demonstrated. Great differences between pure frost resistance and resistance against deicing salt could be observed, so that these results formed the basis for the modelling of frost damage mechanisms.

From the received results, it could be seen, that the moisture uptake - as most important parameter for the deterioration progress – could be subdivided into three different sections, depending on the w/b-ratio and the type i.e. amount of additives. Each section could be characterised by different effects. Overall, the results have shown, that additives have a high impact on the deterioration process and the gradient of loss of RDM.

In addition, the influence of ageing has been studied, which showed high influences on the frost resistance. A summary of the data can be found in the D6 report as well as an evaluation of the damage process within the D8 report. All deliverable reports can be downloaded from the Conlife web page.
Basically, fundamental data of such a wide range of different HPC mixtures under frost attack are of greatest interest for concrete consumers and suppliers. With this knowledge it is possible to assess the frost resistance of HPC mixtures even in advance and to avoid therefore frost or deicing salt damages on HPC structures in practice.

These experimental results received by different partners have been already partly published within different scientific journals or conference proceedings. A summary together with hints for optimal frost and de-icing salt suitable HPC mix designs are also given within the manual (Deliverable D10), which will be disseminated at the final CONLIFE workshop.

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