WEBER REPAIRS FOR BLAIR’S BRIDGE
webercem spray DSF by Saint-Gobain Weber was specified by BAM Ritchies for the repair of a concrete retaining wall on the approach to Blair’s Bridge. The wall had suffered progressive concrete spalling over its full length with exposed reinforcement covering an area of up to 200sqm.
Following a detailed survey, the repair methodology called for the weak and delaminated concrete to be removed by hydro-demolition. The surface was prepared for the installation of 69mm stainless steel formers, which were fixed into position to match the movement joints in the wall capping beam.
webercem spray DSF was applied to the structure incorporating A252 steel reinforcing mesh to the full 69mm thickness and hand trowelled to provide a flat profile. A final flash coat was applied to give a uniform texture to the wall. Around 40 tonnes of webercem spray DSF was used in this project.
webercem spray DSF is designed for dry process spray application to give high early strength, reduced rebound and waste. It contains alkali glass fibres that offer better strain relief and stress distribution and help to reduce shrinkage cracking. Conformity testing to BS EN 1504-3 meets the requirement of a Class R4 repair product. It offers high-build – up to 150mm thickness can be applied in one pass on vertical and overhead faces. BAM Ritchies incorporated 20mm wide movement joints using polysulphide mastic sealant.
The company’s concrete team completed the works within the three week period commissioned by Falkirk Council.