Reinstatement and protection of concrete clarifiers from waste water. Background The city of Dunedin’s Wastewater Treatment facility processes over 6 million gallons of wastewater each day, and was experiencing severe degradation of the concrete within its two clarifiers. The concrete was made using limestone aggregate, which was being severely eroded by the acids in the… Read more
Rapid Concrete Repairs & Waterproofing of Cooling Tower Basin Background WindMark Beach is a 2,020 acre residential and resort community in the historic town of Port St Joe located in Northwest Florida, which has been carefully designed to compliment and respond to its coastal environment and over 1,000 acres of the community are placed in… Read more
Repair and freeze thaw protection to circular concrete spillway. Background The circular spillway of the Whiteadder Reservoir is bordered by an elevated walkway supported by concrete beams. As a consequence of the exposed location, extensive freeze thaw attack of the concrete cover had occurred to cause spalling which required rectification to ensure continued integrity of… Read more
Waterproofing of concrete roof and repair to internal soffit beams. Background The deterioration in the condition of the Swanland Water Tower required the use of a range of materials to bring the structure up to standard following leakage of rainwater through the roof section causing corrosion. The Solution Given the diverse nature of the damage,… Read more
Repair and chemical resistant lining to primary settlement and humus tanks. Background With close to 400 waste water treatment works under its control, Southern Water has a duty to process and recycle the dirty water from around two million households. Having been in service since the 1960’s the primary settlement and humus tanks at… Read more
Corrosion protection on ballast tanks. Background The Matco Thames was scheduled for major refurbishment in the Harland & Wolff Shipyard which dominates the Belfast skyline. In advance of the work starting, the Client considered alternative modern technologies for the lining of the ballast tanks following repeated failures with traditionally used materials. It was felt that… Read more
1,000m² of abrasion resistant flooring in area subject to steel wheeled trolleys. Background Most of the floors in this 1960’s factory are precast concrete or mass concrete slabs with construction joints and drainage channels dividing many workshop areas. Royal Doulton, the world famous creators of art and domestic china, required a coating which could withstand… Read more
Rapid reinstatement of potholes and worn areas to concrete deck by toll booths. Background Acclaimed as one of the Seven Wonders of the Modern World, the 6 lane bridge was opened by President Franklin D Roosevelt in 1937. The only route to San Francisco from Marin County, this 1.7 mile structure now transports over 100,000… Read more
Installation of new runway lights. Background The Isle of Man Government has agreed a £44 million runway extension project at Ronaldsway Airport, which will see it achieve compliance with the 240m Runway End Safety Area (RESA) recommendation. This will involve building a promontory into the sea in 2009, and once completed the main surfacing works… Read more
Moisture suppression prior to installation of decorative flooring. Background After many years of unsolved problems with vinyl tiles repeatedly delaminating from the floors, the cause was finally established as osmotic blistering. This was a consequence of there being no vapour barrier included when the four original classrooms were built in the 1950’s. The pressure generated… Read more
Reinstatement to taxiways and hard-standings on military airbase. Background A base for Squadrons of Nimrod and AWACS, RAF Waddington hosts visiting NATO aircraft, including the vertical take-off and landing Harrier Jump Jet. The concrete taxiways and hard-standings were showing signs of deterioration from weathering and chemical attack from aircraft hydraulic fluid, together with the ground… Read more
Moisture suppression on 1,115m² new concrete floors to fast track construction. Background Under pressure to complete construction to allow for commissioning of this new extension to the JFK medical facility in Florida, the contractor was impatient to see the moisture levels in the new concrete floors reach an acceptable level so that the specified floor… Read more
45,000m² of a durable, waterproof coating to baggage handling floor 4m below sea level. Background Situated on reclaimed land, at the time of construction this was the world’s largest passenger terminal. Its lower floor, several metres below sea level, houses the baggage handling facilities. The 600mm tethered slab construction was subject to the ingress of… Read more
Architectural, slip resistant, waterproof finish to the pool surrounds of a prestigious Hotel Spa. Background In keeping with the prestige nature of this exclusive resort, a unique flooring surface was required to reflect the hotel’s high standards, whilst also improving safety by providing a slip resistant finish. Equipped with jacuzzi, sauna and a Turkish bath, the… Read more
Permanent Reinstatement of Concrete Manhole Cover on A406 North Circular Road Background Urgent repairs were needed to a dilapidated concrete infill manhole cover in the western bore of Fore Street Tunnel. This forms part of a heavily trafficked main ring-road around London. The first thought was to make a temporary localised repair with an acrylic/epoxy… Read more
Slip resistant finish to concrete ramps suffering from freeze thaw attack. Background To maintain safe access to this retail complex in Glasgow, it had become necessary to reinstate the surfaces of the concrete ramps which had been attacked by freeze/thaw cycles during exposure to the harsh winters. This presented a hazard for wheelchairs and pedestrians… Read more
Chloride protection using a Migratory Corrosion Inhibitor on 3,500m² of concrete deck. Background Following tests carried out by the Swedish Concrete Institute (CBI), it was found that the concrete deck in one of the central Stockholm car parks contained a high level of chlorides caused by deposits of de-icing salts from the vehicles. Especially where… Read more
Corrosion protection of steel sheet piling in a tidal zone. Background Located between Dorchester and Lyme Regis, the West Bay harbour is constructed of Larssen sheet piles which are regularly under the assault of waves up to seven metres in height. The existing coal tar epoxy had almost completely eroded leading to wide spread rusting and the situation was… Read more
Corrosion protection of existing steel sheet piling suffering from ALWC. Background After 30 years’ exposure to salt spray and cyclical tidal immersion, the steel piled wall of the west quay at Brighton Marina was corroded to the extent that up to 60% of the section had been lost in some locations. An innovative and environmentally friendly solution to this problem… Read more
Reinstatement of Concrete for Marina Damaged by Seawater Background Situated on the Somerset coast, Watchet Harbour is in an area of one of the highest tidal rise and fall levels in Europe. During construction of the new marina, cast in situ concrete was damaged by seawater, leading to an urgent programme of remediation. The Solution Having experienced… Read more
Protection of reinforced concrete columns from chloride ingress in a tidal situation. Background Inspection of the 70 supporting pillars at the Shell UK terminal on the River Mersey revealed localised spalling of the concrete and corrosion of the reinforcement, due mainly to chloride attack and waterborne pollutants. A concrete repair system was sought to rectify the damage and to prevent further… Read more
Repair and chloride protection of seawater intake tanks and pumping chambers. Background The largest aluminium smelting operation in Asia relies on the supply of cooling water produced from a desalination unit. After 20 years service, the concrete seawater intake tanks and associated pumping chambers were suffering from extensive corrosion of the steel reinforcement, leading to cracking and spalling… Read more
Repair and protection of a reinforced concrete jetty in a tidal zone. Background Originally constructed in the 1980’s, the privately owned Malpas Jetty had been subject to constant exposure to sea water spray and tidal erosion. As a consequence, urgent repairs had become necessary to make the structure safe and extend the service life, as large scale failure… Read more
Repair and waterproofing of aqueduct suffering from erosion and moorland water attack. Background Built in the late 1890s the Nidd Aqueduct carries more than 120 million litres of water each day across the Yorkshire Dales. A century’s exposure to heavy flows of acidic moorland water had resulted in severe erosion of the concrete resulting in leakage. The Solution… Read more
Concrete Protection for New Pre-cast Breakwater Sections Background The 10km Corniche in Doha is one of the focal points for the local people who spend leisure time on its broad promenades and parks. Protection from high seas is provided by a concrete breakwater which suffers from erosion from wave action and chloride induced corrosion of… Read more
Corrosion protection of steel support structure and reinstatement of concrete encasement Background Designed by Sir W Halcrow & Partners, Deal fishing pier was built in the 1950’s and consists of a structural steel frame, supported on steel piles. Although part of the steelwork had been encased in concrete to provide corrosion protection, the whole structure was showing signs… Read more
Asbestos encapsulation in underground service tunnels. Background Despite placing an ever increasing reliance on modern wireless technology, beneath our major cities and towns there is still a maze of tunnels which were built during the 1950’s to carry vital telecommunication cables. Designed to withstand a 20,000 tonne atom bomb, they were generally constructed from cast iron… Read more
Corrosion protection to new steel sheet piling. Background The Bontuchel Fish Pass is a new construction with the specific purpose of stocking the River Clwyd and its tributaries with 15,000 migrating sea trout and salmon. The structure consists of a downstream pool and weir pass and an upstream ladder to allow the fish safe access…. Read more
Waterproofing and chemically resistant coating of overflow channel and balancing tanks. Background The new swimming pool complex at Formby comprises two pools, the main full size pool and a smaller, children’s pool. The two pools are surrounded by a concrete overflow channel, from which the overflow water from the pools is channelled into concrete balancing… Read more
Repair and waterproofing of basement walls and soffits and internal rendering. Background This Grade II* listed building which was the creation of Britain’s greatest theatre designer, Frank Matcham and his architect Robert Beale, was completed in 1903. The building’s design was derived from the great ballrooms and music pavilions of Imperial Europe allied with the… Read more