Considerations on adhesion and moisture susceptibility of asphalt mixtures by mean of mechanical properties / Considerações acerca da adesão e da suscetibilidade à umidade de misturas asfálticas densas à luz de algumas propriedades mecânicas

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

This study presents a contribution to the understanding of the adhesion phenomenon and its loss when water acts in asphalt mixtures. Several kinds of asphalt mixtures were evaluated by means of ASTM and AASHTO moisture susceptibility tests. Experiments based on factorial design were performed considering some of the main factors that act on adhesion phenomenon, such as: aggregate (basalt, gabbro and granite), asphalt (CAP 20 and CAP 40), laboratorial mixture production procedure (Marshall, ASTM and ASHTO), air voids content (4 and 7%), asphalt content (3 levels) and the presence of lime. Mechanical properties of asphalt mixtures were evaluated by resilient modulus and tensile strength. The main conclusions are: lime improved adhesiveness of asphalt mixtures for all studied cases; AASHTO’s procedure was more effective to diagnostic the moisture susceptibility; resilient modulus test indicated changes in mechanical characteristics of specimens that the tensile strength did not detect; mixtures with CAP 20 exhibited less moisture susceptibility than mixtures with CAP 40; mixtures with high air voids presented higher loss of adhesiveness; mixtures with higher asphalt content tended to exhibit lower adhesiveness losses. In almost all cases, the asphalt mixtures with granite aggregate exhibited more water susceptibility, despite asphalt’s kind and content.

ASSUNTO(S)

adhesion cohesion asphalt mixtures coesão mechanical properties moisture susceptibility adesão misturas asfálticas propriedades mecânicas suscetibilidade à umidade

ACESSO AO ARTIGO

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