The highly plastic and viscoplastic behavior of asphalt at high service temperatures possibly leads to irreversible deformations in form of rutting which significantly influence road safety. Therefore the deformation resistance is one of the most important usage properties of asphalt. To quantify the deformation resistance, besides wheel tracking, the uniaxial cyclic compression test as a special case of the triaxial cyclic compression test without lateral confinement is used in Germany. Thereby cylindrical asphalt specimens are exposed to a sinusoidal pulsed-shaped cyclic compression load with rest periods for 10.000 load cycles. The specimens may be fabricated by impact compactor, roller compactor or may be drilled out of asphalt pavement. As decisive parameter the strain rate at the inflection point of the pulse creep curve is to be determined. If the inflection point is not reached during the test the local tangent between the last 1.000 load cycles is considered the strain rate. The deformation resistance is mostly influenced by asphalt composition (kind of binder, binder content, granulometry), volumetric parameters as the density and the compression ratio as well as the kind of compression. Within the project FE 07.0253/2011/ERB it was possible to quantify and qualify these influences for different pavement layers of 21 test sections. Thereby precious know-how with cyclic compression test was gained which will lead to a more detailed description of deformation properties of asphalt.
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