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Development of a mechanistic-empirical based overlay design method for reflecti...
Sousa, Jorge B.; Pais, Jorge C.; Saim, Rachid; Way, George B.; Stubstad, Richard N.This paper describes a new and innovative mechanistically based pavement overlay design method that considers the most predominant type of overlay distress observed in the field: Reflective cracking above old cracks in the underlying pavement surface. Both dense-graded hot mix asphalt and gap-graded asphalt rubber (wet process) mixes were studied, in the laboratory and in the field, to derive the necessary mech...
Método de dimensionamento de reforços para controlar a reflexão de fendas
Sousa, Jorge B.; Pais, Jorge C.; Saim, Rachid; Way, George B.Esta trabalho descreve um novo método empírico-mecanicista para o dimensionamento de reforços de pavimentos de modo a controlar um dos mais predominantes processos de ruína de pavimentos, a reflexão de fendas. Tanto as misturas convencionais como as misturas descontinuas com betume borracha foram estudadas, tanto em campo como em laboratório, para o desenvolvimento dos modelos mecanicistas e estatísticos. Os m...
Effect of crumb rubber origin on asphalt rubber hot mix laboratory performance
Pais, Jorge C.; Sousa, Jorge B.; Saim, Rachid; Pereira, Paulo A. A.Asphalt rubber traditionally has been produced with crumb rubber coming from an ambient grinding process and mostly from car tires. With this product and the binders used in Arizona and California the specifications currently present in ASTM D 6114 have been established. Nowadays relatively new types of crumb rubber are available in the markets namely those that have been produced by cryogenic methods and can ...
The effect of mode of loading on the comparison between asphalt rubber and trad...
Sousa, Jorge B.; Pais, Jorge C.; Saim, RachidExperience has demonstrated that Asphalt Rubber Hot Mix (ARHM) is particularly effective in inhibiting reflective cracking through thin overlays placed above cracked pavement surfaces. However little numerical work has been published in this area. Numerical computer analysis using finite element approach investigated the predominant mode of loading in reflective cracking and flexural fatigue phenomena in AC pav...
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