The Dowel Bars is a cylindrical metal round bars or rod, also usually made from wood and plastic. Dowel rods are often cut into short lengths called dowel bars. Dowel Bar also call as dowel pins which are commonly used as structural reinforcements, divers applications, including steel structure, concrete and other numerous applications.
These bar 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, it can be adopted.
In automobiles, dowels are used when precise mating alignment is required, such as in differential gear casings, engines, and transmissions. Bolts in a bolted joint often have an important function as a dowel, resisting shear forces. For this reason, many bolts have a plain unthreaded section to their shank.
The main function of the dowel bars is to transfer the wheel load from one slab to the adjacent slab through the shear and bending moment. It can be embedded on both the slabs, and on one slab there is a dowel cap which provides space for the bar to occupy it when there is expansion in both slabs.