How Polyurethane has Changed Infrastructure Repair and Maintenance

The widespread availability of utilities and infrastructure may go without a second thought for much of the population, but that’s not the case here at USG. The care and maintenance of these underground structures is what keeps our society functioning smoothly. Advancements in repair technologies, particularly polyurethane injection, have redefined what effective infrastructure maintenance looks like. By addressing subsurface conditions without excavation, this approach has changed how utilities, transportation assets, and municipal structures are repaired and preserved. This article explores how polyurethane injection addresses subsurface infrastructure challenges differently than traditional repair methods, and why USG incorporates this innovative approach into its rehabilitation services.

Infrastructure Repair and Maintenance: A History Lesson

Before polyurethane injection became widely used in infrastructure rehabilitation, repairs relied on methods that were often effective but invasive, time-consuming, and disruptive to surrounding environments.

Excavation and Replacement

One of the most common approaches was full or partial excavation. Crews would dig down to expose damaged utilities, structures, or soils, remove failing components, and replace them entirely. While effective, this method required significant surface disturbance, extended shutdowns, and costly restoration of pavement, landscaping, and surrounding infrastructure.

Cementitious Grouting

Traditional grouting methods such as cement were frequently used to fill voids, stabilize soils, or reduce water infiltration. These materials relied heavily on gravity to spread and often struggled to achieve uniform penetration in fine or unstable soils. Cure times could be long, and material washout was a concern in wet conditions.

Surface Patching and Reactive Maintenance

In some cases, repairs focused on surface-level fixes such as patching concrete, sealing joints, or applying liners without addressing subsurface voids or soil loss. While these approaches could temporarily restore functionality, underlying issues often remained unresolved, leading to recurring failures and repeated maintenance cycles.

Polyurethane Injection for Infrastructure Repair and Maintenance

Polyurethane injection is a newer, innovative method for repairing infrastructure. It not only offers a minimally disruptive approach to repair and maintenance, but also addresses a major factor that affects these structures: soil conditions. Saturated, shifting, or voided soils play a major role in the condition of infrastructure. Additionally, polyurethane also can seal cracks and leaks in infrastructure.
Before polyurethane injection takes place, assessments must be done. These assessments are often a combination of geophysics testing, utility locates, and CCTV inspections performed by NAASCO certified personnel when done by USG.
After gathering data through these various testing methods, a strategic plan is made for injections and a polyurethane formula is chosen based on factors such as water or void presence, as well as infrastructure needs.
Polyurethane is injected directly into the soil surrounding the structure. It may be injected into the soil that reach the depth required, or they may be done through holes drilled into the concrete structure. The method of application varies depending on project needs.
Polyurethane is an ideal product for infrastructure repair and maintenance because:

It can stabilize the soils that surround infrastructure from erosion.
It can fill voids in soil that cause structures to sink or crack.
The right polyurethane formula can be used in saturated conditions. Some formulas are even certified for use around potable water.
It can seal cracks in infrastructure that allow it to leak or have inflow and infiltration, also known as I&I.
It does not require extensive excavation, allowing work to be done without disrupting the surrounding environment.
It cures quickly, making structural restoration a fast process.
Polyurethane is long lasting, making it a long-term repair that can extend the service life of existing structures.

USG, INC: The Intersection of People, Safety, Service, and Technology

At USG, infrastructure rehabilitation is guided by a commitment to people, safety, service, and technology. The evolution of polyurethane injection has reshaped how critical infrastructure can be maintained, allowing subsurface issues to be addressed efficiently, safely, and with minimal disruption to surrounding environments. By reducing the need for excavation and extended shutdowns, polyurethane has made it possible to preserve existing assets while keeping communities and operations moving. When infrastructure challenges arise, USG combines proven expertise with advanced repair technologies to deliver solutions that are effective, durable, and forward-thinking. Contact USG today to learn how our polyurethane-based rehabilitation services can support your infrastructure maintenance goals.