The dowel bar retrofit is a rehabilitation technique used to restore load transfer across joints in concrete pavement. It's also known as load transfer restoration (LTR) and is a method of rehabilitating older concrete pavement. Although it can be used in new construction, the majority of its use is on highways. Several states are retrofitting older roads with epoxy-coated dowel bars.
The dowel bar is placed in a slot that is cut into the pavement. This slot is a minimum of two inches in depth and should be parallel to the centerline of the roadway. The slot may be cut using a diamond-bladed saw. A gang-mounted diamond blade can cut three or four slots simultaneously in each wheel path. Depending on the size of the project, a walk-behind saw may be used to produce the slots. Look at this website https://www.linkedin.com/company/pacific-trail-manufacturing-inc/about/
Before placing dowels, the area around the joints should be cleaned. This should include any debris, dirt, or oil which may have been in the joints. Once the area has been properly cleaned, a bonding agent should be applied. Normally, this is done with a portable mixer. Regardless of the type of patching material that is used, the application should be done according to the manufacturer's instructions. When the patching is complete, the area should be cured to prevent drying shrinkage.
One of the most important things to consider when doing a dowel bar retrofit is the placement of the expansion cap on the dowel. This is a special piece of hardware designed to reestablish the joint. The cap is typically made of expanded polystyrene foam.
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