The Job
This Maryland void filling project by CJGeo is at the Port of Baltimore. The 11″ thick slab floor of a storage shed at a port facility settled up to 6 inches. Cores and non-destructive imaging (GPR & microgravity) indicated there were extensive voids below the floor.
Past work on the nearby bulkhead found large voids under the outside footings, along with several old, empty pipes beneath the floor.
Performing the polyurethane grouting.
The Challenge
Due to relatively thin voids, which were all less than 6 inches, and void filling grout had to be highly mobile. However, this posed risks should the grout make its way into an unfilled abandoned pipe and into the river. The owner did not want to lift the floor. So, grouting had to be low mobility to prevent loss, but also fill all voids at a practical hole spacing.
The Solution
CJGeo proposed polyurethane grouting for this project. The original design was for a 50/50 mix of polyurethane and cement grouting. CJGeo gave a valued engineering proposal to perform all grouting with polyurethane. CJGrout 35NHV was proposed to balance mobility for complete of fill and reaction time to avoid any runaway loss into the adjacent waterway.
CJGeo mobilized a grouting rig and placed about 6300lbs of grout over a three-day period. Pneumatic rock drills were used to speed drilling.
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