Influence of drainage system efficiency in the asphalt pavement performance. / Influência da drenagem subsuperficial no desempenho de pavimentos asfálticos.

AUTOR(ES)

Antonio Carlos Oquendo Pereira

DATA DE PUBLICAÇÃO

2003

RESUMO

Since the implementation of the first roads, there are indications that constructors already had knowledge concerning drainage influence in the pavement performance. Many countries, where highway administration costs are criteriously available along pavement lifetime, have been developing researches regarding considerations about harmful effects from excessive water in the pavement structure. Renowned methods such as AASHTO, already consider the influence of drainage system efficiency in the pavement structures design. In this work, brief historic and an analysis about national and foreign design methods are presented, taking into account considerations concerning influence of drainage system and seasonal variations of moisture content in the structural pavement performance. Employing the Falling Weight Deflectometer, deflection measurements were carried out in a test section, about 900 m long, in order to evaluate the resilient modulus layers and the structural behavior variations due to water infiltration from pavement edge. From experimental sections data obtained, it was possible to evaluate the magnitude of these parameters and then realize, through analytical models that represent the actual national design methods, the reduction estimate of evaluated pavement lifetime. Finally, this work propose the introduction of a thickness adjustment parameter, called Drainage Adjustment Factor, to consider the adverse drainage conditions in the flexible pavement structure design procedure advocated by DNER.

ASSUNTO(S)

drenos subsuperficiais desempenho de pavimento pavimentos drainage system drainage umidade asphalt pavement performance drenagem subsuperficial

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