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Gyratory compaction - influence of compaction angle on stability and stiffness characteristics

Title: Gyratory compaction - influence of compaction angle on stability and stiffness characteristics
Author(s): N. Ulmgren
Paper category : conference
Book title: Sixth International RILEM Symposium on Performance Testing and Evaluation of Bituminous Materials
Editor(s): M. N. Partl
Print-ISBN: 2-912143-35-7
e-ISBN: 2912143772
Publisher: RILEM Publications SARL
Publication year: 2003
Pages: 244 - 249
Total Pages: 6
Nb references: 6
Language: English

Abstract: It is a well-known fact that the choice of laboratory compaction method has an influence on the mechanical characteristics of the produced specimens and that it is difficult to reproduce in the laboratory the degree of compaction that is achieved on the road. The Marshall hammer is unsuitable for this task and as an alternative Gyratory compaction has won many adherents today. Different standards for gyratory compaction normally fix the angle for the compaction procedure at 1.0° or 1.25°. Earlier studies have shown that the angle of compaction has a great influence on the number of rotations needed to reach a certain degree of compaction. In this study the influence of the angle on the mechanical characteristics of the specimen, at the same degree of compaction, has been compared. The mechanical parameters that have been a part of this study were stability (prEN12697-25A uniaxial cyclic compression) and stiffness (prEN12697-26 - part indirect tensile test). The results from laboratory compacted samples have also been compared with tests on cores taken from the road.The results clearly show that when the number of rotations required to reach a predetermined degree of compaction decreases, the permanent deformation will increase and the stiffness will at the same time decrease. It is also shown that with a greater compaction angle (and fewer number of rotations) the values for the Uniaxial cyclic compression test and for stiffness will be closer to the values obtained for the cored specimens from the road.

Online publication: 2003-03-02
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143772.029

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