Title: THE RELATIONSHIP BETWEEN RUTTING AND CREEP TESTING OF ASPHALTS. PARTS 1&2
Abstract: The first part of the article describes the development of laboratory test methods which investigate the relationship between rutting and creep testing using a loaded wheel driven in a single line over the test material. Deformation results in terms of rutting were evaluated using the geometrical effects of the contact area of the tyre and the thickness of the asphalt in a layered elastic model of the system. It is assumed that only the viscous component of the stiffness modulus contributes to the permanent deformation. A direct comparison was possible between creep and rutting tests by plotting the stiffness modulus of the mix against that of the bitumen for the creep tests and against the viscous part for the rutting tests. Details are given of the creep test method and the rutting tests which were carried out on a circular laboratory track in Amsterdam and a forward and backward rolling wheel at Egham, England. The second part of the article describes the results of the tests giving details of the relationship for a variety of material including asphaltic concrete, sand asphalt, hot rolled asphalt, mastic asphalt and bituminous macadam. Results showed that creep tests predict the deformation properties in a way that rut depths produced in tests can be predicted. Creep tests on road samples indicate that it should be possible to extend the relation to rutting in roads and airfields. This paper was originally published in German in Strasse un Autobahn, (1975) 26(1) p15-21 and 26(2) p54-59. (TRRL)
Publication Year: 1990
Publication Date: 1990-10-01
Language: en
Type: article
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