Estudo do uso de barras de transferência de comprimentos reduzidos em pavimentos rígidos de concreto autoadensável
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Data
2009-06-26
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Universidade Federal de Goiás
Resumo
The use of concrete pavements in highways is a valuable alternative to obtain a
surface with high durability and low maintenance. This type of pavement has the
performance compromised by fissures, especially when they occur in the joint with greater
vulnerability of the concrete pavement. This work presents a study of the effectiveness of
sawed joints in concrete pavements where eleven plates were tested until failure. The
variables were: length of circular dowels (200 mm, 300 mm, 400 mm and 500 mm), dowel
diameter (10 mm and 16 mm) and type of concrete (conventional and self-compacting).
The tests were performed on the concrete plates supported on a base composed of sheets of
rubber. A line load was placed on one side of the joint. The test results showed that the use
of transfer dowels contributes significantly to the efficiency of the concrete pavements and
increasing the length and the diameter of the circular dowels improves efficiency; 10 mm
diameter dowels are not compatible with 120 mm thick concrete pavements, but 16 mm
dowels bars present good performance; the use of reduced dowel bar lengths below 40 mm
is not recommended; pavements with conventional concrete have better performance in the
joints due to better aggregate interlocking that the conventional concrete of this search
present, when compared the self-compacting concrete; dowels bars with reduced length did
not reach yielding, characterizing an incomplete use of steel dowels because the transfer
energy its over before the yielding of steel dowels
Descrição
Citação
REIS, Fábio Gonçalves dos. Study of the use of transfers dowels with reduced lenghts in rigid paviments of compacting concrete. 2009. 260 f. Dissertação (Mestrado em Engenharias) - Universidade Federal de Goiás, Goiânia, 2009.