A hotel in Baltimore had a continuously wet floor in the basement utility room. Water was oozing out from under the power feed bank housekeeping slab, which had been poured on top of the floor slab. There were two presumed point sources: the unsealed joint between the floor and the wall, and the power feed conduit wall penetrations. The pit where the power conduits came through the wall and turned up into the power feed cabinets was 18″ deep, and always full of water.
Extensive exterior drainage work had been done under the presumption that surface water was flowing down the outside face of the basement wall, and then through the unsealed floor:wall joint and/or into unsealed joints in the conduits and then through the conduit penetrations. The exterior drainage improvements, which included re waterproofing approximately 500sqft of wall, slowed, but did not completely stop the water intrusion.
A forensic engineer overseeing the project reached out to CJGeo about performing chemical grouting inside of the utility room to underseal the floor, and to seal the conduit penetrations.
CJGeo proposed chemical grouting utilizing a low viscosity hydrophobic prepolymer chemical grout.
Fibrous material soaked in grout was placed into the utility conduit openings to seal them against water intrusion. The 250sqft floor was then undersealed with grout, which extruded up through the joint between the wall and floor, and also through various cracks in the floor.
Upon completion of the grouting by CJGeo, the conduit pit was dry, and there are no longer any leaks.