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1 Archives of Civil Engineering

1 1998

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Shear strength properties between asphalt pavements layers

100%

Raab C. , Partl M.

Archives of Civil Engineering

1998

tom Vol. 44, nr 3

353-366

Adhesion problems between the individual layers of a pavement structure often lead to damage or failure. In spite of the importance of adhesion for the functioning of the road pavement system, this characteristic, when compared to the material specific properties of the layers, has received little attention so far. In most European standards there are a lot of specifications for characterising an individual layer, whereas requirements for adhesion between layers in most cases are totally missing. Within the framework of Swiss Road Engineering Research the Swiss Federal Laboratories for Materials Testing and Research (EMPA) was given the task to conduct the research project 'Methods to Assess the Adhesion Between Layers of a Pavement Construction' . The aim of this project was the evaluation of a simple, practice oriented and standardizable investigation method for the adhesion between layers as well as the application and verification of this method for different material types. Another aim was to perform a material comparision of typical Swiss pavements. The study was carried out using different test temperatures. Various top layers were tested, such as well graded asphalt concrete, stone mastic asphalt, gussasphalt and porous asphalt. Cores from newly layed pevements were investigated, determining either the inter-layer or the in-layer shear strength. The investigation showed that the shear strength between the top and the second laver in new pavement constructions is mainly influenced by the properties of the top laver. The most noticeable difference is seen between a dense pavement with high binder content (i.e. gussasphalt) and a pavement with high air voids (i.e. porous asphalt). One can also see a connection between the maximum inter-layer shear strength of the top and the second layer as well as in-layer shear strength of the top layer. As expected with a bituminous material, the shear strengh is extremely temperature dependant. The influence of temperature was found to be a factor of 3 to 4 when testing temperatures changed from 20oC to 40oC.