The Demands on Highway Infrastructure.
Across the UK, highways and bridges are expected to do more than ever. They carry increasing traffic volumes, support vital economic activity, and are often expected to remain in service for decades beyond their original design life.
For the engineers responsible for maintaining these assets, the challenge is clear: keep infrastructure safe, serviceable and durable while working within the realities of limited budgets and approval processes.
Many of the factors that threaten concrete structures are well understood. The challenge lies in managing them before minor deterioration becomes a major repair project.
Why does Highway and Bridge Concrete Deteriorate?
Concrete is often viewed as a highly durable material, and rightly so. However, even well-constructed concrete is continuously exposed to environmental conditions that act upon it over time.
In the UK, one of the most significant factors is moisture. Rainfall, high humidity, and repeated wetting-and-drying cycles mean that highway and bridge structures are rarely isolated from water for long. Once moisture enters concrete, it can serve as a vehicle for a range of deterioration mechanisms.
- Project in brief: New Speybridge
Freeze-thaw cycling is a good example. Water absorbed into the concrete can freeze during cold weather, expand, and place internal stresses on the surrounding matrix. Repeated cycles can gradually weaken the concrete, leading to cracking, scaling and surface damage.
Carbonation presents another long-term risk. As carbon dioxide from the atmosphere penetrates concrete, it can reduce the alkalinity that helps protect embedded steel reinforcement. Over time, this process can leave reinforcement vulnerable to corrosion, particularly where moisture is present.
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Other Factors also Contribute.
Winter gritting operations expose highway and bridge structures to de-icing salts, which can introduce chlorides that accelerate corrosion of reinforcement.
Heavy traffic loading can create microcracks that provide additional pathways for water ingress.
While each mechanism is different, they are frequently linked by a common factor: the movement of water through the concrete.
Small Problems Rarely Stay Small.
One of the challenges of infrastructure maintenance is that deterioration is often gradual and largely invisible in its early stages. Engineers will be familiar with structures that appear sound on the outside but reveal a very different story once inspections begin.
A bridge deck may appear sound when moisture, chlorides or carbonation are advancing beneath the surface. By the time visible cracking, spalling or exposed reinforcement emerges, significant deterioration may already have occurred.
What is the Cost of Downtime?
At that point, repair options often become more disruptive and more costly. Traffic management measures may be required. Possession windows can be limited. Committees and stakeholders may need to approve funding. What begins as a manageable durability issue can quickly become a complex asset management problem.
Are you looking beyond reactive repairs to strategies that extend service life before substantial deterioration occurs?
Protecting Concrete by Controlling Moisture.
If water is the primary transport mechanism for many forms of concrete deterioration, reducing its movement through the concrete can yield significant long-term benefits.
Hydrogel-based concrete treatments are designed with this principle in mind.
Rather than forming a surface coating that may wear away or require ongoing maintenance, hydrogel technologies work within the concrete itself. The treatment reacts within the pore structure to help reduce the movement of water and dissolved contaminants through the concrete matrix.
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By limiting moisture ingress, these treatments can help slow the processes that contribute to freeze-thaw damage, carbonation-related deterioration and reinforcement corrosion. The result is a more durable concrete structure that is better equipped to withstand long-term environmental exposure.
For infrastructure management, this can translate into an extended service life, reduced maintenance requirements, and fewer disruptive repair interventions over the asset’s life.
A Practical Approach to Infrastructure Durability.
MARKHAM specialises in advanced hydrogel treatments that improve concrete durability and help infrastructure management teams protect their valuable assets.
Our technologies have been used globally to enhance the performance of concrete structures exposed to challenging environments. By addressing one of the fundamental causes of deterioration, moisture movement through concrete, hydrogel treatments provide a practical way to support long-term asset preservation.
- Project in brief: BP Sunbury Undercroft
For engineers responsible for highways, bridges and other civil infrastructure, durability is about more than protecting concrete. It is about maintaining serviceability, managing budgets effectively and reducing the need for future intervention.
Are you assessing the condition of an existing structure? Planning a maintenance programme? Or looking for ways to extend the life of critical infrastructure? Contact MARKHAM to discuss your project’s specific requirements and objectives.
