Underwater repair work comes with specific challenges. Limited access, constant water exposure and the impracticality of dewatering can quickly complicate even straightforward remediation projects. For contractors and asset owners working on marine structures, bridge piles and submerged concrete repairs, the margin for error is small and the repair material matters.
That’s where Conbextra EP65 Plus has been designed to perform.
Ideal for underwater grouting and repair applications, Conbextra EP65 Plus is a high-performance epoxy grout that delivers reliable placement and long-term durability in permanently water-immersed environments. From wharf and jetty remediation to submerged baseplates and marine concrete repairs, it offers contractors a practical solution where conventional cementitious grouts are simply not suitable.
Built for fully submerged conditions
Conbextra EP65 Plus is suitable for projects where conventional grouting solutions are challenged by permanent water exposure or difficult access conditions. Typical applications include:
- Underwater repair of bridge piles
- Wharf and jetty pile remediation
- Marine and tidal zone concrete repairs
- Grouting submerged baseplates brackets and voids
- Repair of permanently water immersed concrete structures
- Projects where dewatering is impractical or impossible
Unlike traditional grouts that can wash out or lose integrity during placement, Conbextra EP65 Plus is formulated to displace water rather than mix with it. This enables true underwater application while maintaining strong adhesion to water immersed concrete and masonry substrates.
The product’s high density and low viscosity allow it to flow effectively into voids and cavities using bottom up placement techniques, helping eliminate trapped water and reducing the risk of void formation. Once cured, the grout develops high early and long-term strength, even in submerged conditions.
For contractors working on live marine assets or critical infrastructure, this can make a significant difference to project sequencing and downtime. Because dewatering is not required, temporary works can often be reduced or eliminated altogether, helping crews maintain operational continuity while simplifying the repair process.
Steps to smarter underwater placement
Following a few core application principles can significantly improve placement quality and long-term performance in complex underwater grouting scenarios.
1. Mix above water
Conbextra EP65 Plus should always be mixed above water. The pre-measured two component system helps ensure consistent batching and a uniform mix before placement begins.
2. Place grout from the bottom up
Introducing the grout from the lowest point of the repair area allows water to be displaced progressively, reducing the risk of trapped voids.
3. Provide a top vent for water escape
A vent or outlet at the highest point enables displaced water to escape as the grout rises through the repair zone.
4. Maintain continuous flow during placement
Steady uninterrupted placement helps avoid water entrapment and promotes a more consistent bond throughout the repair.
5. Feed from one side only
Using a single feed point minimises the risk of trapping water between advancing grout fronts.
6. Control pour thickness
Typical placement thickness ranges from 10 mm to 100 mm in a single pour, with larger voids able to accommodate aggregate additions where required.
These practical installation principles give contractors greater confidence when working in difficult marine and submerged environments, particularly where access windows may be limited.
Reducing program risk on marine infrastructure projects
Feedback from customers using Conbextra EP65 Plus consistently points to reliability in submerged conditions and confidence during placement. Users report strong bond performance without the need to fully dry substrates, along with simplified repair sequencing compared to traditional underwater repair methods.
For asset owners, that translates to reduced downtime and fewer disruptions to operational infrastructure such as ports jetties bridges and marine facilities.
As ageing infrastructure continues to drive demand for efficient remediation solutions, products capable of performing reliably below the waterline are becoming increasingly important. Conbextra EP65 Plus addresses such challenges, helping contractors complete underwater repairs with greater control efficiency and confidence.
Find out more
For detailed application guidance, users should refer to the Conbextra EP65 Plus - Underwater Application Technical Data Sheet and Fosroc’s Epoxy Grouts Application Guide.
