Geosynthetics on Asphalt Wearing Surfaces for Timber Bridge Decks

 

Natalia S. Correia

University of Sao Paulo, Sao Carlos, Sao Paulo, Brazil
e-mail: nataliacorreia@usp.br

Fernando H. M. Portelinha

Sao Carlos Federal University, Sao Paulo, Brazil
e-mail: fportelinha@ufscar.br

Ricardo M. Scaliante

University of Sao Paulo, Sao Carlos, Sao Paulo, Brazil
e-mail: scaliante@usp.br

Carlito Calil Jr.

University of Sao Paulo, Sao Carlos, Sao Paulo, Brazil
e-mail: calil@sc.usp.br

Cassio A. T. do Carmo

Huesker Geossinteticos do Brasil
e-mail: cassio@huesker.com.br

 

 ABSTRACT

The use of asphalt wearing surfaces on timber bridges for low-traffic volume roads has shown an improvement of the structure service life and the user comfort. The use of geosynthetic may provide benefits on the asphalt wearing surface since it improves asphalt pavementís adhesion to the deck, minimizes severe cracking, and reduces the reflective cracking, besides providing a waterproof layer. Although the use of geosynthetics is a well-known theme on paving engineering, there are few studies showing this application for wearing surfaces on timber bridges decks, currently an indispensable practice to protect the decks. This paper describes the main issues related to wearing surfaces on timber bridges decks, the use of geosynthetics and the mechanisms involved in preventing cracks, some recommended tests and the construction methods. Further, a Brazilian successful case study with the use of a paving geogrid on a timber bridge deck is reported. This case demonstrates the benefits of using a geogrid on both minimizing cracks appearance on the deck surface and as a reinforcement element in the bridge approach embankment.

Keywords: Geosynthetics; asphalt wearing surfaces; timber bridges; reflective cracking.

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