UPN: 8112 Project Number: STPP 86-1(55)10 Project Name: Bridger Canyon
Concern has been expressed that the Department’s expanding practice of installing centerline rumble strips on many of the State’s two-lane roads has exacerbated joint weakening by exposing more of the longitudinal internal joint to the intrusion of moisture and other environmental factors. Based on this concern, the MDT Butte District has elected to test a joint stabilizer in attempt to mitigate meet-line deterioration. The chosen product is the Jointbond (JB) longitudinal joint stabilizer.
Per the manufacturer’s information, Jointbond was developed to inhibit the premature deterioration of construction joints by penetrating the asphalt pavement and combining with the existing asphalt binder. As a polymerized maltene-based emulsion, this stabilizer may extend the service life of longitudinal joints and adjacent areas in two ways:
- Improving the chemistry of the in-place asphalt binder
- Adding a physical in-depth seal to the construction joint, thereby sealing the joint and surrounding area against intrusion by air, water and deicers, and detrimental effects of freeze-thaw.
Once topically sprayed, the stabilizer migrates 1-2" into the asphalt joint and surrounding mat (applied one and one-half foot on either side of the joint) and may take several hours to fully cure based on ambient air temperature. It is typically used on pavements less than two years old. This project has one added element. JB has only been applied on unsealed pavements; because of time constraints, the application of JB was delayed a season. The pavement received a seal & cover (chip seal) prior to the JB installation. This will be the first trial in the country using this stabilizer on a chip-sealed asphalt pavement.
Construction Report
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