longitudinal joint repair
LONGITUDINAL JOINT REPAIR
The HDE JMH can be used for longitudinal joint repair to ensure a better watertight joint and prevent accelerated deterioration via infiltration into the asphalt structure. It is particularly cost effective when the joint has widened to such an extent,that joint filler will not stay, or when the cracks have spread to the adjacent joint. By reheating the asphalt it can be reworked, asphalt can then be added to fill in any voids in the pavement. This process creates a lasting seamless repair.
A 2005 joint repair of 1000 feet of raveled joint at The White House on Pennsylvania Avenue confirmed that joints can be reheated efficiently and structurally repaired with no physical damage to the properties of the asphalt. The unique synthetic asphalt with a clear resin and two colored aggregate exhibited properties similar to polymer modified asphalt, with a lower softening point. Making a suitable longitudinal joint without echelon paving proved challenging to the contractor. Two 500 foot joints were not acceptable. Joints were repaired by the contractor using the HDE JMH 400T to reheat the joint and an HDE mini recycler was used to reheat asphalt material required to fill the gap in the joint. The work was done to the satisfaction of the Federal Highways and after years the repairs remain in good condition.
A project in Toronto, Ontario, Canada, involved heating 2200 feet (700 meters) of unacceptable joint paved the previous fall. Salt and sand had penetrated the joint and the authority required complete removal of the joint 4” (100mm) on either side of the joint or the contract alternative to the repair which was grinding and removal of the entire lane. Removal of the joint was easily done after heating, new asphalt was then placed and compacted. The authority required an extension of the warranty on the joint for one year, and prior to expiry requested further repair on just 20 ft (6 meters). At that point it was difficult to identify where the joint was.
From this the concept of Hot-In-Place Joint repair was born. HDE has since advanced this repair technique to develop an economical way to heat and scarify and finally relay the asphalt in order to re-compact the asphalt.
This repair can be done at a rate exceeding 5-10 feet/minute depending on site conditions and leaves a structurally sound, high density, low permeability pavement that will match adjacent mat quality. The joint repair system will allow contractors to provide a new and longer lasting repair technology to a problem that to date lacks a long term solution. This hot in place technology applied using a 48 foot train of patented HDE infrared heaters ensures a seamless compacted bond between the old pavement and the rejuvenated area, extending the life of the pavement to match the mat properties..