The Job
This North Carolina polyurethane grouting project is located at Elon University. It is part of the Innovation Quad project, being built by Whiting Turner.
The Challenge
The site concrete contractor poured a large set of steps near the entrance of the new building. The steps are approximately thirty feet wide, and have roughly eight feet in rise. The steps are constructed over fill material, including site soils and dense graded crushed aggregate.
During a precipitation event, the grading at the top of the steps directed a significant amount of water towards the top of the steps. The water had nowhere to go other than below the steps. This washed out a significant amount of material, and also caused consolidation of some backfill material.
The Solution
The project’s geotechnical consultant recommended the general contractor reach out to CJGeo to address the voids below the steps. They also recommended performing DCP testing as a minimally invasive way to check the bearing capacity of the underlying materials after the erosion event.
The most suitable polyurethane grout for this project was CJGrout 20SDB. CJGrout 20SDB is a high mobility grout designed specifically for undersealing and bulk void filling, with lifting ability designed out in order to manage risk of displacing the brand new structure.
CJGeo mobilized a single polyurethane grouting crew to the site. They started by performing DCP testing, which uncovered voids within the top three feet of fill material immediately below the steps. The crew used sacrificial tubing to ensure that these voids were completely full, along with the voids immediately below the steps.
Confirmation of fill was material returning to the surface.
Speak With An Expert
Facing a similar challenge to this North Carolina polyurethane grouting project? Give us a shout or shoot us a text. Click the state marker for the location of your project for contact info for the appropriate rep.
