Working in Partnership with Costain & Thames Water
Ham Island Bridge Deck Structural Waterproofing
Costain & Thames Water engineers specified Prokol Polymers for the Ham Island bridge deck waterproofing application; the bridge was located across the Thames at Royal Windsor.
The Bridge Was Tired & Desperately In Need of Refurbishment
Once the survey of the bridge had taken place the specification could then look to be constructed, taking into consideration all the key factors surrounding this very unique and sensitive project every aspect needed to be covered. Prokol & the approved applicator working with Costain and their client Thames Water looked at a well structure team plan to execute the deck waterproofing application.
The Prokol Specification - Steel Bridge Refurbishment
The bridge structural steel had to be rectified firstly as it was heavily corroded, The structural steel had to be prepared by captive blasting under encapsulated sealed scaffolding, a fresh clean profile was required to standard SA2 - SA2.5. This level of preparation would give an excellent bond strength for the new anti corrosion protection. Zinc primers were applied to the clean steel (SA2 2.5 Profile) then the entire bridge was coated in a final application of anti corrosive level C4 Prokol Ferroteq 960 High Solids Finishing Coating.
Prokol Polymers NBS Specification with 3D & 2D Detail Drawing Pack
Prokol Polymers Technical Surveyor Reviewing & Recording All Elements for Application Specification
Main Bridge Deck Road Membrane
The old road wear course had to be removed as the Prokol specification required the application to sit on the original concrete substrate, once the old surface had been removed a series of tests took place to ensure the integrity of the old concrete prior to any application. Once the existing substrate was hammer tested in a non destructive method some repairs in epoxy were required to make good the bridge deck before the waterproofing system could commence.
Removed Old Road Surface Removal
Prokol Concrete & Steel Primer Phase
With all test results positive as expected the next phase of Prokol primer application can begin, Prokol Primer ProFast RW was specified for its fast cure, (40 Minutes at 20 degrees C) and its moisture tolerant physical properties. Prokol specified a broadcast of kiln dried sand into the primer but require it to begin tacking off first, this to avoid the aggregate falling through the primer to the surface causing a possible weak bond between the primer and substrate. Also the sand bed on the primer it allows for a good mechanical key and foot traffic whilst it cures beneath, & should inclement weather be encountered the sand process will remove the need to re-apply another layer of primer. The Prokol ProFast RW Primer is also used on steel as well as concrete and has anti - corrosion properties, the primer forms a single application across the substrate laterally & terminates vertically 100mm onto the bridge facade creating a full tanking detail. Adhesion to concrete of the Prokol system is around 5 -7 mpa so very high bonding. This level of adhesion is required where heavy goods vehicles are in regular use of the bridge, highways standard is around 1.2 mpa, so this application adhesion was five times higher than that of the highways standard.
Primer & Sand Application