Approach Sleeper Stabilization Grouting
The Job
CJGeo completed approach sleeper slab stabilization grouting on Interstate 81 near Roanoke, Virginia. This work was part of a larger bridge reconstruction project. The bridge contractor needed to correct the settlement of an approach sleeper slab that was outside of the specified tolerance. The geotechnical engineer of record specifically recommended that the contractor contact CJGeo to utilize their polyurethane grouting methods to stabilize the slab and correct the displacement.
Performing polyurethane grouting on the sleeper slab.
The Challenge
The settled approach sleeper slab on I-81 needed fast, non-disruptive correction to maintain the bridge reconstruction schedule. Traditional repair methods, such as tear-out and replacement, would have been incredibly time-consuming, costly, and disruptive to traffic flow on the busy interstate. Because this was a primary travel corridor, the project required that at least one lane of traffic remain open in each direction at all times to minimize public inconvenience. The contractor needed a solution that would stabilize the slab quickly and allow for immediate return to normal traffic volume after the repair was completed.
The Solution
CJGeo proposed and executed the stabilization using CJGrout 48NHL geotechnical polyurethane. This high-density structural grout is ideal for this type of application because of its rapid cure time and high structural capacity. CJGeo completed the grouting over two nighttime shifts. This schedule allowed crews to keep at least one lane of traffic open during the work.
Once the grouting was completed each night, the lanes were immediately opened back to normal traffic because the CJGrout 48NHL cures within a few minutes of injection. This non-disruptive, fast-acting solution prevented the massive disruption and cost associated with tearing out and replacing the entire structure. The work corrected the slab settlement and brought the structure back into tolerance quickly.
Speak With An Expert
Have a project similar to this approach sleeper stabilization grouting project? Facing issues with lateral earth pressure, poor soils, or hard-to-access voids? Reach out to one of our experts today to see how CJGeo’s innovative solutions can help.
