By DRMashhour a Ghoneim
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Additional info for Design of reinforced Concrete Structure Volume 1
Transverse cracking is the main problem of a flexible pavement one should question whether or not this cracking is low temperature cracking of the asphalt or whether this cracking is initiated by movements of the underlying cement treated base. In order to be able to select the most appropriate maintenance strategy for those situations, it is not sufficient to determine the horizontal movements across the crack due to temperature variation. Also the vertical movements across the crack due to the passage of a wheelload is of importance.
Special attention should be given to proper modelling of the various interfaces that can be recognized in the overlayed cracked pavement. From the material presented here it will be obvious that a lot of work still has to be done before an adequate in depth analyses of cracked pavements and their reflective crack potential is possible. Fig. , 1992). 38 Reflective Cracking in Pavements: State of the Art and Design Recommendations Fig. Simple shear test frame to be used under Marshall press for testing shear resistance of interfaces.
1 Introduction Les interventions du précédent colloque “Reflective Cracking in Pavements—Assesment and Control”, qui avait eu lieu à LIEGE en Mars 1989, avaient permis de montrer l’extrême diversité des fissures que l’on peut rencontrer sur les chaussées. Cette diversité, qui s’explique par les causes multiples qui peuvent être à l’origine du phénomène de fissuration, se traduit par des fissures extremêment variées dans: * leur forme * leur configuration * leur ouverture Ces différentes fissures se transmettront donc, selon des schémas et avec des vitesses euxmêmes très différents, à une couche supérieure.