A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Performance of Dowel Bars and Rigid Pavement
In 1997, an experimental high performance jointed concrete pavement was constructed on US 50 east of Athens, Ohio. In this pavement, 25% of the Portland cement was replaced with ground granulated blast furnace slag. Epoxy-coated steel dowel bars were used throughout most of the project to provide load transfer across the joints to adjacent slabs. Fiberglass dowels and stainless steel tubes filled with concrete were installed in a few joints to compare their effectiveness with the epoxy-coated bars. A limited number of epoxy-coated steel and fiberglass bars were instrumented with strain gauges to measure bending moments and vertical shear induced in the bars as the concrete cured, during environmental cycling of moisture and temperature in the concrete slab, and as Falling Weight Deflectometer applied dynamic loads near the pavement joints. Thermocouples were installed to monitor temperature at different depths in the concrete layer during the strain measurements. The strain data indicated that: (1) significant stresses were generated in the dowel bars and in the concrete surrounding the dowel bars soon after the concrete was placed, (2) temperature gradients in the concrete slabs caused high stresses in the bars, and (3) stress levels generated in the fiberglass dowel bars were less than those generated in the epoxy-coated steel bars.
Performance of Dowel Bars and Rigid Pavement
In 1997, an experimental high performance jointed concrete pavement was constructed on US 50 east of Athens, Ohio. In this pavement, 25% of the Portland cement was replaced with ground granulated blast furnace slag. Epoxy-coated steel dowel bars were used throughout most of the project to provide load transfer across the joints to adjacent slabs. Fiberglass dowels and stainless steel tubes filled with concrete were installed in a few joints to compare their effectiveness with the epoxy-coated bars. A limited number of epoxy-coated steel and fiberglass bars were instrumented with strain gauges to measure bending moments and vertical shear induced in the bars as the concrete cured, during environmental cycling of moisture and temperature in the concrete slab, and as Falling Weight Deflectometer applied dynamic loads near the pavement joints. Thermocouples were installed to monitor temperature at different depths in the concrete layer during the strain measurements. The strain data indicated that: (1) significant stresses were generated in the dowel bars and in the concrete surrounding the dowel bars soon after the concrete was placed, (2) temperature gradients in the concrete slabs caused high stresses in the bars, and (3) stress levels generated in the fiberglass dowel bars were less than those generated in the epoxy-coated steel bars.
Performance of Dowel Bars and Rigid Pavement
S. M. Sargand (author)
2001
50 pages
Report
No indication
English
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