We evaluated the bond behaviour of concrete pavement and glass fibre-reinforced polymer (GFRP) dowel bars in linear sections used for transferring loads. We also studied the movement of a GFPR dowel bar during shrinkage and expansion due to temperature and humidity variations in concrete pavement. The results are summarised as follows: 1. The draw-out and push-back (push-in) strengths of a GFPR dowel bar decrease as the bar diameter increases. Therefore it is more effective to use a GFPR dowel bar with a larger diameter to avoid destruction, which would result if the dowel bar were to lock and thus cause the concrete pavement to curl. This allows free draw-out (slab shrinkage movement) and push-back (slab expansion movement) without the dowel bar restricting tensile stress caused by the movement. 2. Draw-out and push-back strengths are greater for oval than for round cross sections. In particular, the elliptical GFPR dowel bar increases the interface area of the upper and lower contacts with the concrete pavement, thus preventing destruction of the pavement from stress concentrations that may occur in the dowel bar. 3. The strength characteristics from repeated draw-out and push-back of the GFPR dowel bar differ in value depending on the geometry of the dowel bar, but demonstrate the same pattern under repeated cycles. The residual push-back and draw-out strengths show no dependence on bar geometry under repeated cycles, indicating that for repeated shrinkage and expansion in concrete pavement, a lubricant action occurs between the surfaces of the concrete pavement and GFPR dowel bar. Thus, the draw-out and push-back strengths do not decrease as a result of cracks or defects in the bond area of the concrete pavement and the GFPR dowel bar.
Bond properties of glass fibre-reinforced polymer dowel bars in jointed concrete
Bindungseigenschaften von glasfaserverstärkten Polymerdübelankern in Betonverbindungen
Polymers and Polymer Composites ; 16 , 3 ; 187-192
2008
6 Seiten, 9 Bilder, 4 Tabellen, 13 Quellen
Aufsatz (Zeitschrift)
Englisch
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