Verhalten von 'Halbstarren Deckschichten' bei statischer und dynamischer Beanspruchung

Product Description

Abstract Behavior of Semi-Rigid Pavement Layers under Static and Dynamic Loading Semi-rigid pavement layers (HD) are used for the construction of traffic and industrial surfaces with high static and/or dynamic loads. HD consist of a void-rich asphalt support structure that is filled with hydraulic mortar. Within the scope of this work, the rheological properties as well as the mechanical behavior of HD under dynamic loading were investigated. To characterize the rheological properties, the uniaxial creep test with static compression loading was employed. The results were analyzed with regard to elastic, viscous and plastic deformation components. A significant influence of the bitumen contained in the support structure of the HD on the deformation behavior was determined. Finally, the results were used to calibrate a rheological model with which the deformation behavior of HD under uniaxial static loading can be described. The material behavior under dynamic loading was investigated using the splitting tensile fatigue test in force-controlled loading mode. The Results show a dependence of the material's stiffness on temperature and loading frequency, which indicates a significant influence of the bitumen in the asphalt support structure of HD on the behavior under cyclic loading. Furthermore, the splitting tensile fatigue test was used to assess the fatigue behavior of HD. The results suggest a significant influence of bitumen properties on the fatigue resistance of HD. Based on the investigation results, recommendations for assuming material parameters for the computational dimensioning of road pavements with HD are finally given. Abstract Behaviour of semi flexible toppings with regard to static and dynamic loading Semi flexible toppings (SFT) are applied as surface course material for areas with high static and/or dynamic loading such as industrial floors and heavily trafficked road pavements. SFT consist of an open graded asphalt filled with a cement based mortar. Within the scope of this work the rheological characteristics and the mechanical behaviour of SFT under dynamic loading were analysed. In order to characterise the rheological behaviour of SFT uniaxial creep testing with static compression load was applied. The results were analysed to determine the elastic, viscous and plastic properties. It was found that similar to a conventional asphalt the bitumen contained in the open graded asphalt of the SFT has a significant effect on the deformational behaviour. On basis of the experimental results a rheological model was chosen and calibrated in order to describe the uniaxial deformational behaviour of SFT. To evaluate the mechanical behaviour of SFT under dynamic loading cyclic indirect tensile testing was performed in stress controlled mode. The results show that the material's stiffness highly depends on the temperature and loading frequency. This indicates a decisive influence of the bitumen contained in the SFT on the mechanical properties under cyclic loading. Further, to evaluate the fatigue performance of SFT, fatigue testing was performed using cyclic indirect tensile testing. A significant correlation between the type of bitumen of the SFT and the resistance to fatigue was found out. Based on the results obtained in this work recommendations for the assumption of mechanical properties for the analytical design of road pavements with SFT are given.