Product category:
Plant Design and Construction
News Release from: Instarmac Group | Subject: 'Cemcoat ACE'
Edited by the Processingtalk Editorial
Team on 28 July 2003
Conservation and preservation on a
concrete bridge
A multi-faceted concrete reinstatement system, able to satisfy structural protection demands as well as local environmental requirements, has been employed on the Dolwen Bridge over the River Severn
A multi-faceted concrete reinstatement system, able to satisfy structural protection demands as well as local environmental requirements, has been employed to reinstate and repair deteriorated concrete on the Dolwen Bridge, which traverses the River Severn in Wales At certain times of the year this particular section of the Severn experiences significantly fluctuating water levels and is prone to severe flash flooding with water levels often reaching as high as the bridge arches
This article was originally published on Processingtalk on 27 Jun 2005 at 8.00am (UK)
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This unique circumstance, plus the fact that the soffits of the structure were suffering from low cover over the steel reinforcement, meant that over time the concrete had simply worn away.
As if to exacerbate the problem, the river is also a waterway for migrating salmon and because of this the adoption of an environmentally sensitive repair system was essential.
Powys County Council therefore considered it important that the reinstatement system comprised of materials that would provide the necessary long-term protection to the concrete, whilst at the same time being sympathetic to the river's environmental requirements.
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The full concrete repair and reinstatement system, from Tamworth based Instarmac Group, provided the answer.
In addition to providing a finish comparable to additional concrete cover, the system's water based 'Cemcoat ACE' - an elastomeric, anti-carbonation coating, was specified entirely because of its environmentally-sympathetic properties, thus minimising the risk to the waterway's marine life and protected Salmon population.
Specialist repair contractor Concrete Repairs (CRL) carried out the project and found Instarmac materials both easy to mix and apply.
After breaking out the damaged concrete, the cleaned reinforcement was primed with Instarmac zinc rich 'Cemprime ZN' and the surrounding prepared concrete surface primed with a 'Cemprime SP' slurry, before localised patch repairs were completed with 'Cembuild GPR'.
This polymer modified, shrinkage compensated, high build cementitious mortar is specifically formulated for applications of up to 50mm on vertical surfaces and up to 20mm on soffit areas.
The soffits on the Dolwen Bridge received 50mm, applied in several passes.
The mortar gains strength very quickly, provides low permeability to water and long-term durability.
Larger repair sections were reinstated with 'Cemflow MC' - winner of the recent 'Smart Award for Innovation'.
The material's hydration control system significantly reduces the possibility of shrinkage cracks in its plastic and hardened state.
The micro concrete complies with the DoT BD27/86 - materials for repair of concrete highway structures, conforms to clause 1704.6 control of alkali silica reaction, is compatible with cathodic protection techniques and will not segregate or bleed.
After curing with 'Cemcure AR', the application of Instarmac 'Cembuild FC' created a fair-faced surface ready to accept 'Cemcoat ACE', the water based, weather-resisting elastomeric anti-carbonation coating.
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