The challenge
The finish on the walls and floor slabs had to produce excellent results that would meet the USA’s strict rules on concrete finish.
Due to the necessarily robust nature of the structural design for security reasons, the detailing and installation of the reinforcement was more complicated than most structures.
Construction had to accommodate high levels of security on site, requiring a positive approach from all parties.
Our solution
The suspended slab over the car park not only includes two access ramps and the foundations for the three access control buildings, but is also stepped and sloped to allow for landscaping and security requirements. Therefore, the layout of beams was very complicated as they varied in depth and width, particularly over column locations where beams intersected.
There was a significant area of concrete structure around the Chancery exposed to view when complete, so the architect specified an exposed aggregate finish (grit blasted) to the concrete using large panel formwork.
The solution supplied to the contract included MasterGlenium SKY 569, which the contractor had used in past contracts, especially those involving slip-forming. MasterGlenium 123 and MasterGlenium SKY 902 were used in the piling mixes with good flow retention. Masterset R200 was used throughout in general works.
Master Builders Solutions assisted in trials at London Concrete’s batching plant for every mix, prior to use on site.
