Polyurethane Grouting
Millions of pounds and counting.
Polyurethane grouting delivers a fast, clean, and highly controlled alternative to traditional cement for stabilizing and leveling structures, from commercial floors to heavy highway bridge approaches. Injected under pressure, two-part liquid polymers spread through subterranean voids before rapidly expanding and hardening.
Low-mobility foams exert immense expansive force to precisely lift heavy structures, while high-mobility formulations focus on void filling and deep soil compaction. Curing in minutes with a minimal equipment footprint, polyurethane injection drastically reduces operational downtime and overall project costs.
Related Services
Undersealing
Polyurethane grouts can be injected to fill small voids below concrete slabs where water accumulates and seeps through cracks or joints to the surface.
Void Filling
Polyurethane grouts can be injected below surfaces where voids exist, expanding to fill cavities beneath structures while adding minimal load compared to flowable fill.
Compaction Grouting
Polyurethane grouts are injected through small steel tubing to depths up to 35’ in stages. As the polyurethane expands, it displaces and compresses the adjacent soil, curing to 95% within 15 minutes. Learn More
Concrete Lifting
Polyurethane grouts expand upon injection with controlled upward pressure to lift and level sunken structures. Often used in combination with polyurethane compaction grouting to stabilize soils below structures. Learn More
Leak Stopping
Polyurethane grouts can be used to fill voids and block water passages through cracks and joints, thereby preventing water intrusion and stabilizing structures.
Pipe, Box Culvert, & Sinkhole Repair
Polyurethane grouts can be used to fill sinkholes and voids and to seal leaks and joints in stormwater structures that caused the soil displacement. Learn More
Been There. Grouted That.®
National Mall Sinkholes
When chronic sinkholes closed a section of the National Mall, CJGeo utilized polyurethane grouting to stabilize the site. Crews injected 55,000 lbs of structural foam across a 16,000-sq-ft grid to fill voids, providing a solid base for reconstruction. Read More
Chesapeake Bay Bridge Tunnel Duct Bank Compaction Grouting
Vibrations from sheet piling caused a critical electrical duct bank to settle at the Chesapeake Bay Bridge Tunnel. CJGeo rapidly performed polyurethane compaction grouting to consolidate the subgrade soils. In just two shifts, we stabilized the duct bank and permanently halted all settlement. Read More
Silver Lake Dam Seepage Repair
CJGeo addressed severe seepage and sinkholes at Virginia's historic Silver Lake Dam using polyurethane grouting. Crews injected a 12-foot deep CJGrout curtain to cut off water flow and fill eroded voids. This stabilized the earthen embankment and restored normal lake levels without excavation. Read More
Advantages of Polyurethane vs Cementitious Grout
Cleaner
Utilizing mechanical packers for containment, polyurethane injection delivers a clean, highly controlled alternative to traditional cement. Rapid cure time and easy surface remediation make it ideal for food-preparation facilities and potable water environments.
Less Disruptive
Polyurethane grouting uses small injection holes. Drilling is rapid and discreet, and the injection itself is virtually noiseless. Equipment is self-contained in a box truck that can stage up to 400 feet away, keeping heavy machinery out of sight and minimizing disruption.
Immediate Traffic
Polyurethane grouting minimizes operational downtime by reaching a 95% cure within 15 minutes. The treated area instantly resumes normal operations, providing the bearing capacity required to support heavy trucks, industrial equipment, and trains.
Fast
Engineered for speed, polyurethane grouting is up to 12 times faster than cement. Equipment design facilitates repairs to begin within minutes of arrival. Smaller drill holes and a wider lifting radius allow repairs to be completed faster and more efficiently.
Lightweight
Polyurethane grouts are exceptionally lightweight (2–8 PCF), minimizing overburden on soils and preventing resettlement. With strength properties similar to soil, polyurethane grout is a versatile alternative to EPS foam blocks for lightweight fill applications.
Waterproof
High-density polyurethanes are hydrophobic and can be installed directly in water, facilitating installation into environments with active flow. Because of the near-immediate curing, water-stopping jobs are fast and easily tested on site for efficacy.
The CJGrout® Advantage
CJGrout®, CJGeo’s own line of polyurethane grouts, is formulated to suit a wide variety of projects, drawing on CJGeo’s extensive experience. Different formulations offer a range of properties tailored to repair needs, such as faster or slower expansion, hydro-insensitivity, and different lifting pressures, ensuring there’s the right product for each job.
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