Adhesion between bituminous mortar and aggregate particles is a key issuecontrolling the durability of open graded asphalt mixtures like porous asphalt concrete. For that reason, adhesion tests are important. In many adhesion tests however it is necessary to prepare stone samples of a specificsize and shape such that they fit in the testing set up. Preparations of the stone samples could imply treatments like sawing and sandblasting. These treatments might change the surface characteristics of the stone samples, which could have an effect on the results obtained from the laboratory tests. In this paper the surface characteristics of two stone types are presented after receiving several surface treatments. Investigated treatments are for instance sawing and sandblasting. From the results presented in this paper it is concluded that some treatments used for preparations of stone samples for the laboratory experiments are affecting specific surfacecharacteristics of the stone samples.
Abstract