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• W609515029 abstract "Asphalt/rock composite materials are used as fillers for large cracks, potholes and joints on road surfaces. The asphalt acts as a binder for the rock particles. An important property of this composite is that it remains elastic during loading and the daily seasonal thermal expansion and compression. In order to enhance the elastic property of asphalts, they are blended with a rubber and a compatibilizing polymer. While the enhancement of the elastic properties of this binder from bare asphalt has been dramatic, a new problem has appeared - the binder does not adhere strongly to the rock material, lifting off and delaminating easily. Delamination at the rock asphalt interface is extremely undesirable, and it jeopardizes the integrity of the mix, leading to rapid further deterioration of the road surface. Four types of rock surfaces were tested - Lynch, Tilcon, Aggregate and Cirenzia. The asphalts tested were PG-52-34, modified crumb rubber, crack sealer and PG-70-40. The goals of these preliminary experiments are to (i) understand the fundamental cause for the observed poor adhesion between the modified asphalt and the rock surface, and (ii) suggest potential cost-effective strategies for mitigating the adhesion problem. Experiments have been conducted to grade the four supplied asphalts in terms of their adhesion to the four types of rocks. This characterization was completed by measuring the contact angle of a probe liquid, in this case water, on each of the eight materials supplied. These measurements have provided two critical pieces of information: (i) The surface properties from the standpoint of the adhesion of each of the rock materials are very similar, and thus cannot be discriminated from just this perspective; and (ii) The gradation of asphalt adhesion to the rock is in the order PG-70-40 > Crack Sealer > PG-52-34 > Modified Crumb Rubber. While these experiments have provided a qualitative ordering for the adhesion between the various types of asphalt and rocks, a quantitative measurement of the adhesion energy requires direct peel-off experiments. These experiments are summarized in this report. For the PG-52-34, PG-70-40 and Modified Crumb Rubber asphalts, the failure was cohesive (the interface bonding between the asphalt and rock was stronger than the asphalt). The crack sealer displayed an adhesive failure." @default.
• W609515029 created "2016-06-24" @default.
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• W609515029 date "2002-05-23" @default.
• W609515029 modified "2023-09-27" @default.
• W609515029 title "CHARACTERIZATION AND MANIPULATION OF ASPHALT ADHESION TO ROCK" @default.
• W609515029 hasPublicationYear "2002" @default.
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