Influence of subsurface drainage in the service life of roadway pavements. / Considerações sobre a drenagem subsuperficial na vida útil dos pavimentos rodoviários.

AUTOR(ES)

Angela Martins Azevedo

DATA DE PUBLICAÇÃO

2007

RESUMO

There has been verified, in practice, that the absence of pavement drainage is one of the main factors of early degradation of pavements. More, there are few procedures of design and performance analysis that effectively consider the damage of water during the design period. However, foreign experiments and researches do not establish a reliable correlation between the construction of pavement drainage features and pavement performance. In this text, there has been analyzed the AASHTO (version of 1993) and HDM-4 models, considered the most spread out in the present time. These models consider the damage effects of free water inside flexible or rigid pavement structures. Theoretically, it was verified that the models are sensitive about the influence of the conditions of draining in the pavement performance. It had been analyzed real data of certain roadway network in the interior of the state of São Paulo and it was verified, in practical, that the flexible pavements without paved shoulder, that is, with precarious conditions of drainage, have presented lower performance when compared with structures endowed with paved shoulders more impermeable. It was evidenced the difficulty of adopting the drainage coefficients in the analyzed models, although the great importance of the setting adjusted in the design. It is commented that, beyond the existence of devices of subsurface draining, is necessary to check its continuity and hydraulical capacity throughout the system. Its suggested procedures for the hydraulical design of the pavement drainage system and the necessity of considering the economic evaluation throughout a period, in accordance with the waited performance (LCCA - Life Cycle Cost Analysis) when the definition of the conception of road pavements, mainly when submitted the heavy traffic and in unfavorable climatic conditions.

ASSUNTO(S)

pavement drainage análise de desempenho pavimentação rigid pavements performance analysis flexible pavements drenagem

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