Dynamic permanent deformation testing of asphalt mixes and deformation waveform analysis

29-35In this study, different specimens of hot mix asphalt (HMA) have been constructed in the laboratory and tested under repeated loading; first permanent deformation and later fatigue tests using Suleyman Demirel University Asphalt Tester equipment (SDU-Asphalt Tester). This study reports evaluation of available information about relationship between permanent deformation and fatigue cracking. Analysis of data shows that the fatigue life of the pavement may be modelled in terms of data obtained from repeated loading axial permanent deformation test results. Based on the analysis of the estimation model for fatigue life from permanent deformation testing, it is concluded that for the evaluation of HMA in fatigue characterization, repeated load axial test for permanent testing can be used in a very satisfactory manner. To be able to model the fatigue lives, in addition to conventional fatigue model parameters new parameters from repeated load permanent deformation test are taken into consideration. Hence, only by examining the permanent deformation tests, it may be possible to predict the fatigue lives of the specimens without carrying out time-consuming fatigue tests

ANALYSIS OF DESIGN AND CAPACITY BY ARRANGING THE FUNCTIONS IN SMALL SCALED AIRPORT TERMINAL BUILDING

Statement of the problem. In this study, airports terminal buildings, the capacity of the airport terminal buildings, and the factors affected the capacity were searched. It was determined that the airport terminal building may vary and their spatial functions affect all airport functions. It was observed that any positive/negative change in the functions of terminal buildings affected the operation of terminal building. Method: A program was developed as a result of observations and studies while investigating the airport terminal buildings. Applicable regulations and the factors which negatively affect the capacity of the terminal, with improvements on the total capacity of the system were investigated

Numerical Modelling of Wheel on the Snow

In the present study, a numerical model for wheel-snow interaction ispresented using finite element method. For this aim, the model of tire is designed using SolidWorks and ANSYS Design modeler. The analyses of the prepared models are performed using ANSYS Explicit Dynamics considering Mooney- Rivilin tire model. Frictional relationship between wheel and snow ground was established and snow erosion is considered as linear, in the analyses. To validate the results, a comparison is carried out with available results. Six different mesh sizes are considered in the study, the effect of mesh sizing and mesh number on the accuracy of the obtained results and solution time is discussed. Finally, it is concluded that models with 0.025 m and 0.02 m mesh sizes give more accurate results than the others and a strong linear proportion exists between the number of iteration and the mesh size

An Investigation into the Use of Ultrasonic Wave Transmission Techniques to Evaluate Air Voids in Asphalt

Air voids and their distribution are very important factors that influence the structural performance of asphalt pavements under traffic loading. Several simple methods exist for the overall (macro) evaluation of air voids in asphalt mixture, however there are very few methods available to assess their micro-distribution within an asphalt matrix. While X-ray methodologies have historically been used by researchers to investigate the complex distribution of air voids in asphalt mixtures, both cost and ease of application do not support their widespread use. The use of non-destructive ultrasonic wave transmission techniques (UWT) is outlined in the paper as an accurate, rapid and economical alternative method. UWT is able to both estimate the total air voids and their distribution within laboratory compacted asphalt samples. Asphalt samples with 14 mm nominal aggregate size manufactured with three types of bitumen; Class 320 (C320), Multigrade (M1000) and a SBS Polymer Modified Bitumen (PMB-A5S) and with different air voids were analysed using UWT techniques. The results have shown that UWT testing has the potential of being a rapid and cost-effective method of estimating total air voids and their distribution in laboratory asphalt mixtures