The first step was to thoroughly clean the old surfaces, a total length of 25,000 m, using both hand tools and grinders in order to remove the hardened, solidified bituminous mass that had lost all its elastic properties from inside the joints.
The joints that still had traces of bitumen along the edges were then treated with PRIMER SN, two-component, fillerized epoxy primer and adhesion promoter.
The old joints that had clean edges with no traces of bitumen, on the other hand, were treated with PRIMER M, one-component, solvent-free primer for polyurethane sealants for compact, absorbent surfaces.
Before applying the new sealant, to ensure the correct size and depth of the joints and prevent it sticking to the bottom of the joints, MAPEFOAM closed-cell, compressible, polyethylene foam cord was placed along the bottom of the joints.
It was only at this point that the new sealant was applied in the joints by hand and using MAPEFLEX SPP electric guns. The sealant chosen was MAPEFLEX PU50 SL fluid, polyurethane sealant which has been specifically formulated for sealing structural expansion and distribution joints in industrial concrete floors, including those subject to intense traffic such as runways and parking bays in airports.
It has a fluid consistency so that it may be applied quickly and, thanks to its quick-hardening properties (around 2 mm every 24 hours), joints may be put into service very quickly, resulting in various economic benefits.
INSTALLING THE LARGE-SIZE CERAMIC TILES
Reliable products of the latest generation were used to install large-format ceramic tiles in the first 15 bathroom blocks which are scheduled to be built over the coming months in the departure area using Mapei products.
ULTRALITE S2 adhesive was used to bond 240 x 120 cm tiles, a product that has been specifically developed to install large format tiles in complete safety. This product is highly deformable, has good trowellability and, thanks to its special formulation developed in the Mapei Research & Development laboratories, it guarantees particularly high yield and good buttering capacity, ensuring that any type or format of tile adheres perfectly.
To make sure surfaces are as hygienic and safe as possible, the grout lines were filled with ULTRACOLOR PLUS high performance, fully water-repellent mortar resistant to the formation of mould, for surfaces which are easy to clean, and with KERAPOXY CQ waterproof, anti-bacterial and acid-acid grout certified by the University of Modena (Italy) according to ISO 22196:2007 standards as a grouting product protected against the formation and proliferation of microorganisms, which prevents the formation of mould and bacteria to help surfaces remain stable and maintain their colour over the years.
WORKS ARE CONTINUING
The recent reopening of Linate Airport doesn’t mean that all the work has been completed. Some of the sites will remain open until the middle of 2021 and the presentation of a completely new airport for the city of Milan.
In the meantime Mapei experts will continue to be present on site to help in the construction of a completely revamped, welcoming and functional infrastructure – with particular attention on design and spatial harmony – which will be able to optimise the flow of passengers and offer them a complete, comfortable and effortless travel experience. Once work has been completed the New Linate airport – which by 2023 will be connected to the centre of the city via the M4 line of the Milan metro rail network – will be an airport designed to put passengers at their ease, with a new range of shops more focused on the business traveller, along with all the services you would expect in any city airport at a European level.