EXPERIMENTAL INVESTIGATION OF CONCRETE PERFORMANCE UNDER MULTI-AGGRESSIVE CYCLE EXPOSURE CONDITIONS

Currently, concrete durability performance is generally examined by a series of individual durability tests, such as carbonation test, freeze/thaw test or chloride ingress test etc. However, in practice, a lot of the concrete structures are exposed in a multi aggressive environment. A highway bridge may suffer from chloride ingress, carbonation and freeze/thaw attack coincidently. Even a normal exposure structure generally undertakes carbonation freeze/thaw attack and wet/dry weathering at the same time. For the structure service life design or estimation, it seems not enough to know the concrete performance just under every individual durability test because those individual factors will affect each other in a multi-aggressive exposure condition. Indeed, survey from the real structure can supply some useful information, it is also scattering and difficult to be used in modelling the structure deterioration process. To address the problem, this paper reports the experimental investigation results of concrete performance under several multi-aggressive cycle exposure conditions. These cycling exposures are specially designed to simulate the most common multi-aggressive exposure conditions occurred in normal and highway constructions. The investigation will bridge the laboratory individual tests and survey on real structure and will be beneficial to improve the methodology of structure service life design and estimation.

• INTRODUCTION

• EXPERIMENTAL PROGRAMME

• EXPERIMENTAL RESULTS

• CONCLUSIONS

• ACKNOWLEDGEMENTS

• REFERENCES