MECHANICAL BEHAVIOUR OF LAYERED ROAD BRIDGE SURFACINGS (IMPERMEABILITY, PROTECTION, WEAR)

COMPORTEMENT MECANIQUE DES REVETEMENTS STRATIFIES (ETANCHEITE, PROTECTION, USURE) DES PONTS ROUTIERS

AN EFFORT IS TO BE MADE TO DETERMINE THE CAUSES OF DEGRADATION WITH A VIEW TO INCREASING THE LIFE OF THE SURFACING AND REDUCING BRIDGE MAINTENANCE COSTS. A FURTHER OBJECTIVE OF THE WORK WILL BE TO REDUCE THE DEAD WEIGHT SUPPORTED BY THE BRIDGE STRUCTURE. THE DIFFERENT LOADS (IN PARTICULARLY DYNAMIC LOADS) AND ALSO THE STRESSES AND DEFORMATIONS TO WHICH THE BRIDGE SURFACING IS SUBJECTED WILL BE ANALYSED AND AS FAR AS POSSIBLE MEASURED. IN MAKING THE INVESTIGATION ACCOUNT WILL BE TAKEN OF THE MECHANICAL PROPERTIES BOTH OF THE BRIDGE SURFACING AND SUPERSTRUCTURE. ON COMPLETION OF THE INVESTIGATION, A BRIDGE SURFACING HANDBOOK WILL BE PREPARED. THE APPLICATION OF TECHNIQUES BASED EITHER ON THE USE OF CONVENTIONAL OR NOVEL MATERIALS WILL BE LISTED AND APPROPRIATE RECOMMENDATIONS MADE. AN INVESTIGATION CONCERNING THE DURABILITY OF BRIDGE SURFACINGS HAS BEEN STARTED AND THIS SHOULD RESULT IN THE ISSUE OF RECOMMENDATIONS AND REFERENCES TO OPERATING PROCEDURES WITH REGARD TO MAINTENANCE.