Dowel bars are smooth round bars which mainly serve as load transfer device across concrete joints. They are placed across transverse joints of concrete pavement to allow movement to take place. Where movement is purposely designed for longitudinal joints, dowel bars can be adopted.
Dowel Bar Types
The type of bar to use is an important consideration, since dowel bars need to last as long as the rest of the roadway. In this regard, the corrosion resistance of the dowel bars is a critical feature, depending on their exposure to moisture and climate conditions. Dowel bars are available made from a number of different materials, ranging from plain, uncoated steel to solid stainless steel. The dowel bar types that exhibit the most resistance to corrosion also tend to have correspondingly higher costs, as shown in the table below.
Most corrosion resistance, highest cost
Solid stainless steel
Stainless steel clad
Stainless steel sleeve, epoxy-coated insert
High chromium steel
Plain, uncoated steel
Least corrosion resistance, lowest cost
Table showing dowel bar types in order from most corrosion-resistant to least.
High chromium steel refers to a formulation of steel that contains a higher chromium content, but less than that required to qualify as stainless steel. Dowel bars of this type are among the most popular, since they can provide good corrosion resistance while being significantly cheaper than stainless steel. In addition to epoxy coating for corrosion resistance, dowel bars need to be coated with a bond breaker material. This prevents them from bonding to the concrete and allows adjacent slabs to move horizontally while the dowel bar remains in place to provide load transfer.
We can provide you various types of Dowell bars confirming to National and International Standards.
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