Mahdi Ali

Green space as one of the most important elements of life and sustainability of city, in case of considering environmental standards and its proper distribution, regarding factors including population, density, and area has crucial and positive effect on the life quality and joyance of people. But at present, a lot of small and large cities of Iran faced with limitation and inappropriate distribution of green spaces, which such condition causes the dissatisfaction and gradual decrease of life quality and health of people. The city of Qom as one of the large cities of Iran, regarding the increasing population and physical growth, requires a desirable urban green space. this research aimed to investigate and analyze the green space use and its per capita in the most populated area of the city (district 1) and presenting appropriate recommendations in line with creating balance in socio-physical structure of the study area, as the subject of this research, can have a great importance. ...

A study of bitumen aging effects on the rheological properties and fatigue behavior is carried out on five polymer modified bitumen provided by an oil company. Dynamic Shear Rheometer (DSR), is used to perform advanced experimental investigation. It allows practicing frequency sweep tests, fatigue tests and time sweep tests. Polymer modified bitumen with different percentage of SBS with or without the presence of crumb rubber are tested before and after short and long aging processes. Master curves were generated based on frequency sweep tests data, they are studied, and a comparison was conducted between each bitumen before and after aging. In this thesis, the DSR is presented, as well as the testing procedure and the tested materials. A fatigue life analysis of the results, based on the use of two different criteria, the first criterion is classically used: it consists in defining the failure as a 50% loss of the initial stiffness. The other criteria based on dissipated energy dat...