Large stone asphalt mixture as a rehabilitation strategy for heavy traffic highways.

• Ano de defesa: 2018
• Autor(a) principal: Mascarenhas, Zila Maria Garcia
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: eng
• Instituição de defesa: Biblioteca Digitais de Teses e Dissertações da USP
• Palavras-chave em Português: Asphalt pavement (Rehabilitation; Design); Deformation; Fadiga dos materiais; Fatigue; Pavimentação asfáltica (Reabilitação; Dosagem)
• Link de acesso: http://www.teses.usp.br/teses/disponiveis/3/3138/tde-23052018-092512/

The asphalt mixtures are commonly used as surface course of highways to ensure the security and comfort for road users. The asphalt mixtures may also be used as intermediate layers of pavement structure, providing better resistance to traffic loads. Thus, the occurrence of distresses can be reduced, increasing the time between pavement maintenance interventions. Large Stone Asphalt Mixtures (LSAM) are a promising rehabilitation solution for pavements that show rutting as the main distress under heavy traffic situations. Though their use is not new, the study of their viscoelastic properties and performance in the field are still unexplored. This thesis presents a brief literature review about the historical use of LSAM around the world, as well as some relevant characteristics for its design. The evaluation of different mixture design methods was performed before the construction of experimental test site with LSAM as the leveling course. The asphalt mixtures mechanical behavior was characterized using dynamic modulus test, flexural bending fatigue test, tension-compression fatigue test and the LCPC wheel track test. The rehabilitated pavement was monitored through a period of one year and a half, using the falling weight deflectometer and rutting measurements. A finite-layer software (3D-Move Analysis) was used to simulate the structures using dynamic analysis, under different temperatures and traffic speeds, considering the viscoelastic properties of the asphalt mixtures obtained in laboratory. The results from the computer simulations can be used as a guide for the design and analysis of the pavement structure and pavement performance. Thus far, the use of LSAM in the rehabilitated test sections was successful compared to the previous rehabilitation solutions tested in the field, showing no permanent deformation after one year of service life.