The Job
This environmental remediation project took place in Redhook, Brooklyn, New York City. An existing building required the capping of a tar pit located inside the structure. The general contractor needed to fill the pit before installing a new floor.
CJGeo capped a Redhook tar pit with impermeable low-density cellular concrete to prevent settlement during an environmental remediation project.
The Challenge
The pit design anticipated filling with material less dense than water. Therefore, the fill material needed to be as low-density as possible to reduce the likelihood of inducing settlement. Conventional fill would have been too heavy. Additionally, the placement area was approximately 150 feet inside the building from the street, making access a challenge. Finally, work had to take place at night to avoid disturbing the building’s occupants.
The Solution
The contractor reached out to CJGeo about filling the pit with low-density cellular grout. CJGeo designed a 59lb/cuft CJFill-Standard mix for the application. This mix provided a permeability of less than 10^-6 cm/sec. We batched and placed the material using a dry batch plant located on the street. The crew pumped the 72 cubic yards of material 150 feet into the building, taking less than an hour to complete. We performed the work at night to accommodate the occupants. The following evening, the environmental remediation contractor welded a membrane over the placement. They then poured a new concrete floor over the material as a cap.
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