Concrete Stabilization Technologies sewer infrastructure repair

Polyurethane’s Role in Sewer Infrastructure Repair

Polyurethane Infrastructure RepairWhen it comes to the construction and transportation industries, polyurethane is one of the most versatile and flexible materials in the world. In its various forms, polyurethane has many applications from coatings, sealants, and adhesives to void filling, structural support, and insulation. As such, polyurethane’s use within the construction industry has steadily grown especially in sewer infrastructure repair projects.

What is Polyurethane’s Role in Sewer Infrastructure Repair?

In sewer infrastructure repair, polyurethane has several useful applications. Polyurethane foam can be used to treat inflow and infiltration issues in manholes, pipe joints, laterals, culverts, and outfalls. It can also seal off and prevent water intrusion to utility boxes, wet wells, and pump stations. Hydrophobic polyurethanes perform exceptionally well in wet conditions, making it the perfect choice for these types of repairs. Using polyurethane for infrastructure repair has many benefits. The material is lightweight, affordable, and fast curing. Despite its lightweight, this closed-cell foam has strong structural properties. It’s also minimally invasive and environmentally inert. Polyurethane repair projects require zero-excavation, which results in a small project footprint.

How Does it Work?

Polyurethane foam is created with a two-part solution. Part A is a chemical called MDI, or Methylene Diphenyl Diisocyanate (also known as ISO) while Part B is resin, a combination of polyols, catalysts, blowing agents, and other components. The two-part solution is mixed using an impingement gun and injected into voids around the affected asset. Tubes can be used to inject the polyurethane into particularly deep or large voids, or otherwise inaccessible areas. Once the polyurethane is injected, it begins to expand to fill the void and compact unconsolidated soils around the infrastructure asset. The polyurethane will follow the path of least resistance to fill and compact soils. As it does so, it will press against the asset, creating a tight seal and blocking off any cracks or other openings that could allow for water and soil to infiltrate. Due to its hydrophobic properties, the polyurethane will displace any water that surrounded the asset, ensuring a dry environment and preventing damage from moisture. Polyurethane is a fast-curing material, which means these types of infrastructure repairs can occur quickly. After injection and expansion, any excess foam is trimmed away to prevent any future blockages within the pipe and the small injection site holes will be filled. With its structural stability, water-repelling qualities, fast cure time, and small project footprint, polyurethane foam makes for a reliable solution to infrastructure repair.
Trenchless Sewer Repair

ROI through I/I: How I/I mitigation pays for itself with CST trenchless sewer repair solutions

Trenchless Sewer RepairCosts are costs, and one of the major costs for cities is continuous Inflow and Infiltration (I/I) into sewer systems. The increased water into the sewer system leads to higher pumping costs, increased degradation of pumps, higher treatment costs of water that shouldn’t need treatment, and other potentially costly issues such as soil degradation, further damage to the pipe and sinkholes that could cause roadway or structural failure. So how do you deal with I/I and how can you pay for the I/I mitigation?

CST’s polymer injection applications provide unique solutions for I/I mitigation. We have the proven results of reducing I/I while also having a very quick payback in reducing the associated costs (a recent study shows that I/I in Tennessee equals 44%!).

CST’s Technologies are highly effective, having the combined effect of sealing the lateral line or manhole while also reestablishing the weight bearing capacity of the soil. The way it works, is a high density structural polymer is injected along the pipe in multiple zones. Once the polymer is injected, it aggressively seeks out the voids and pushes away any water along the structure, forming a water tight seal. The polymer encapsulates the pipe and the joints are sealed against I/I. The injections can occur from the surface or within the pipe itself. View projects and learn more about the process here!

A Summary of CST Applications

Concrete Stabilization Technologies, Inc. is committed to partnering with our local municipalities, engineers ,and maintenance personnel to provide effective solutions for maintaining and extending the life of infrastructure. Whether it be streets and sub grade, curb and gutter, water and wastewater systems or structures, we have advanced technology to address settlement, erosion, and infiltration issues cities, towns, and counties commonly experience. Our non-destructive, no excavation technologies and processes are the superior alternative to tear out and replace or traditional methods such as compaction grouting. Proven, long lasting, viable solutions extend the use life of municipal infrastructure while keeping you in control of your assets. CST has been solving infrastructure rehabilitation, soil stabilization, and concrete settlement issues for over 22 years. Emergency rapid repair, maintenance and rehabilitation services are available.

Streets & Subgrade Stabilization
We stabilize weak, poorly compacted or moisture compromised soils of all kinds, in-situ while leveling structures (including pavements) by injection of high-density structural polymer. At-depth injections eliminate common subsurface soil issues. Utilizing the most advanced technologies, our process drives out water, fills underground voids and fissures and expands to densify the ground.

Rehabilitation with polymer Deep Injection Technology is ideal for streets, highways, bridge abutment and approach stabilization, rehabilitation, pavement/curb & gutter alignment and support, taxiways, runways, tunnels, and infrastructure with settlement problems caused by poor underlying soil compaction and moisture issues.

We provide rapid repair of pavement and structures, washout and sink holes, and voids.

Utility Repair & Rehabilitation

Infrastructure Rehabilitation: Regardless of age or construction of a structure, inflow, infiltration, and exfiltration through cracks, and leaking joints, cause additional expense in both unnecessary water treatment, and repair of settled roadways, sidewalks, and other structures. Our in situ, zero excavation rehabilitation methods allow for injection of a high density, hydro-insensitive polymer to quickly eliminate infiltration into degraded infrastructure and lift, realign, and where needed, stabilize overlying roadways by densifying weak soil, and increasing the collective load bearing capacity.

Manhole Sealing & Encapsulation: We seal, stabilize, and stiffen weak soils around leaking manholes, encapsulating buried infrastructure where soil erosion has created shifts in the drainage structure as well as infiltra-tion of soil. Our technicians are well trained to understand infrastructure systems and how to correctly install polymers to complete the restoration of an infrastructure asset.

Lateral Line Sealing & Stabilization: Sagging lateral lines along with joint and radial cracks cause major disruptions and inefficiencies in storm and sewer drainage systems. As the expanding structural polymer (ESP) is injected, material expansion begins to compact and fill voids around the lateral lines. Outcropping of polymer occurs, confirming voids are filled, as well as eliminating further infiltration.

Corrugated Metal Pipe Repair: Our CMP repair process extends the life of the culvert, eliminates all existing void space, and stabilizes the soil be-neath the culvert. In situ repairs thus restore proper flow. Costs and disruption are greatly reduced, when compared to traditional tear out and replace. When working for railroads, there is no track downtime involved. For cities and towns, no road closures, and traffic interruption is minimal.

Outfall RepairAdditional Repair Processes for:

  • Prevention of water intrusion & water piping
  • Erosion control through sealing and fortifying
  • Elimination of ponding & settlement
  • Leak sealing against hydrostatic pressure
  • Leak sealing against running water
  • Groundwater cut-off around existing structures
  • Curtain walls, cut-off walls, & retention systems
  • Abandonment of pipeline & ducts in-place
  • Remediation of water retaining structures such as dams, dikes, levees, weirs, berms, and reservoirs
  • Remediation of subgrade vaults, conduits, tunnels, lift-stations, and utilidors
  • Remediation of washouts, dam overflow structures, spillways, levees, elevator pits, and tunnels
  • Remediation of water treatment facilities
  • Improvement of the design life of infrastructure
  • Culvert stabilization and realignment
  • Emergency & maintenance/rehabilitation for natural disasters
  • Foundation repair on existing structures
  • Airfield and runway rehabilitation, slab realignment, sub grade soil stabilization

Key Benefits for Engineers, Municipalities, and Government Agencies:

  • Non-Disruptive , No Excavation, In Situ Repairs
  • Proven Technology
  • Long Lasting Repairs
  • Materials are NSF/ANSI Standard 61 Approved Safe For Potable Water
  • Work Around Customer’s Requirements—Off Hours, Nights, Weekends if
  • Trained Technicians and State of the Art Injection Equipment, Surgically
    Precise Repairs & Consistent Results