OnSite Specialist Maintenance Ltd supply and install various polymer coatings and resin coating systems for use in bunds, tanks, and manholes.
Our expertise in providing a resin coating service means that we are sure to have a solution for any application. Our polymer coating and resin coating systems have been installed throughout the UK. Our clients range from petrochemical sites to Rolls Royce and Power Generation Plants such as the new FGD Project at Aberthaw, South Wales.
Carbonation: Carbon dioxide gas penetrating the concrete surfaces will react with free lime converting into calcium carbonate ie. Carbonation. This has no detrimental effect on the concrete apart from reducing its alkalinity which passifies the steel bar corrosion. Once the ph of the concrete has fallen to less than approximately 9 the steel is no longer protected leading to reinforcement corrosion causing bursting stresses and subsequent spalling. Use of surface applied anti-carbonation coatings are ideal for extending the buildings life and improving the aesthetic appearances. Elastomeric crack bridging anti-carbonation coatings are also available.
Chloride ions (salts) entering the concrete structure either as soluble salts particularly on highway structures or previously introduced within the concrete mix as an accelerator (calcium chloride) destroy the protective passive oxide layer around the steel bar. This destructive process will set up incipient anodes along the steel bar leading to electrochemical corrosion and spalling.
Use of surface applied corrosion inhibitors, usually amino alcohol based, have an affinity for the steel creating a protective layer to protect against further decay.
ie. Freeze-thaw action creating micro cracking of the concrete surface with subsequent spalling, thermal movement, or drying shrinkage lead to further damage and deterioration.
We have many years experience as resin coating contractors meaning we understand the physics of concrete deterioration and most cost effective, long-term solution for treating the concrete to improve the visual aspect and increase the life expectancy.
The selection of coatings is influenced by the nature of decay and future demands, physical/aesthetic considerations with a wide range of systems available ie. Silane impregnation, corrosion inhibitors, acrylic rigid or crack bridging coatings, polyurethane anti-graffiti coatings, fire reinforced resins, epoxy, p.u’s etc.
Contact us online now or call us on 0115 933 5010
Recent Concrete Protection Project -
Aberthaw (B), Power Station, Barry, South Wales.
The plant was due for closure until it was decided to build a new FGD Plant (Flue Gas Desulfurization) in order to reduce the plants sulphur dioxide levels by 90%. The plant provides one third of all the electricity throughout South Wales. The total cost of the project was originally estimated at over 150 million pounds.
The FGD required the construction of one of the largest concrete tanks in the UK. The tank filled on the tide and formed part of the desulfurization process. The concrete required lining with a suitable polymer coating system capable of resisting the most aggressive environment.
Concrete repair solution:
OnSite Specialist Maintenance was able to offer a fully warranted system in conjunction with the material supplier MC Building Chemicals. The material chosen was the MC Rim which is a spray applied cementitious polymer coating.
OnSite Specialist Maintenance in conjunction with MC Building Chemicals worked well with the design team and their knowledge in the field of chemical resistant coatings insured that the right materials were specified and applied to the highest standards.