A laboratory investigation on bonding properties of dowels in concrete roads

Title: A laboratory investigation on bonding properties of dowels in concrete roads
Author(s): M. Löfsjögård
Paper category : journal
Serial title: Materials and Structures
Abreviated Serial title: Mater. Struct.
ISSN: 1359-5997
Publisher: RILEM Publications SARL
Volume: 38
Issue: 281
Issue date: 2005-08-01
Publication year: 2005
Pages: 721 - 728
Total Pages: 8
Nb references: 9
Language: English

Abstract: Inclined dowel bars and unmovable bars may cause pavement cracking in the vicinity to the bar ends.
The aim of the investigation is to study if there are any differences in bonding properties due to dowel material, coating or diameter of the dowel.
Steel dowels with different coatings and dowels made of composite material are tested.
The maximum draw-out force for a draw-out travel of 1.
5 mm is measured.
The test is repeated four times and ends with a final cycle to establish the constant force needed for a draw-out travel of 5 mm.
Steel dowels with bituminous coating show the lowest initial draw-out force.
The draw-out force increased 2 to 3 times with a diameter increase of 50 % for steel dowels with plastic coatings.
For composite dowels the comparing result showed an increase of draw-out force 2 to 5 times with an increase in diameter with one third.
The results from the repeating test for several cycles showed that the draw-out and push-back force were almost the same for all dowels.
However, for the dowels with bituminous coating a higher push-back force was needed compared to the draw-out force.
It should be noted that the testing speed could affect the results, especially for dowels with bitumen.

Online publication: 2005-02-15
Classification: Scientific Reports
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/14148