• Título:  ANALYSIS OF THE INFLUENCE OF DESIGN PARAMETERS OF ASPHALT MIXTURES ON THEIR SUSCEPTIBILITY TO AGEING PHENOMENON
• Autor:  Cherkaoui, Maha
• Universidad:  Universidad de Granada
• Departamento:  Escuela de Doctorado de Ciencias, Tecnologías e Ingenierías de la Universidad de Granada
• Fecha de Lectura:  07/10/2022
• Programa de doctorado:  Programa de Doctorado en Ingeniería Civil por la Universidad de Granada
• Dirección: 
  • Sol Sánchez, Miguel del (DIRECTOR)
  • Moreno Navarro, Fernando Manuel (DIRECTOR)
• Tribunal: 
  • AGRELA SAINZ, FRANCISCO (PRESIDENTE)
  • MARTÍNEZ-ECHEVARRÍA ROMERO, MARÍA JOSÉ (SECRETARIO)
  • RODRÍGUEZ ALLOZA, ANA MARIA (VOCAL)
• Descriptores: 
  • SECTOR DE LA CONSTRUCCION
• Fichero de tesis:
• ISBN:  9788411176460
• https://digibug.ugr.es/bitstream/handle/10481/79644/88642.pdf?sequence=4&isAllowed=y
• Resumen:
  Bituminous paving mixtures are used as surface or base layers in a pavement structure to distribute stresses caused by loading and to protect the underlying unbound layers from the effects of water. To adequately perform both of these functions over the pavement design life, the mixture must also withstand the effects of air and water, resist permanent deformation, and resist cracking caused by loading and the environment. Many factors affect the ability of a bituminous paving mixture to meet these structural requirements. The aging phenomenon has a significant impact on the performance and durability of asphalt mixtures, and it is vulnerable to a variety of design elements that can be changed throughout both the design and manufacturing processes. The current thesis investigates the phenomenon of ageing in asphalt mixtures, taking into account both external and internal factors that influence ageing. The first section of the study used laboratory procedures to compare the impact of temperature, time, and pressure on roadway samples. The ageing of two mixtures, manufactured with a high void content and two different modified binders (SBS polymer and crumb rubber), was examined, with the results compared to those obtained for cores from a roadway utilizing identical mixtures in the surface layer. After various ageing periods at various temperature and pressure levels, the stiffness and fatigue cracking life of the mixtures were evaluated. The second part of the research examined the impact of key design factors on asphalt mixture ageing rates. When ranging such variables within reasonable parameters due to probable slight differences during the manufacturing process, the influence of type and quantity of bitumen, filler dosage, and the impact of mineral skeleton on the ageing process of a gap-graded mixture was examined. The results revealed that the characteristics evaluated had a significant impact on the laboratory ageing simulation of asphalt mixtures. Long ageing periods (9 days in this study) at a high temperature (135°C for the examples described in this research) were required to duplicate a significant ageing influence while also allowing for the differentiation of ageing susceptibility of different materials. Moreover, the findings revealed that all factors had an impact on the range of changes in material stiffness, deformation susceptibility, and crack resistance due to the ageing process. According to the findings, the most relevant factors were the type of bitumen and filler content, with the quantity of sand showing lower levels of variation due to ageing, resulting in a more durable and resistant material when utilizing a denser mineral skeleton.