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2006-03-28 News Headlines
Architecturally impressive structure uses Lanxess pigments for coloring Iron oxide pigments from Lanxess are the coloration product of choice for concrete bridge construction of the Arsta Bridge over the River Arstaviken in Sweden.
Iron oxide pigments from LANXESS make buildings attractive as the example
of the Arsta Bridge shows. Stockholm Central Station is a very busy junction.
90 percent of the trains in Sweden start or end their journey there. Up
till now, 500 trains per day carrying around 50 million passengers annually
– more than five times the population of Sweden – had to use
the double-track Arsta Bridge over the River Arstaviken built in 1929.
At rush hours, this caused unavoidable gridlocks which precipitated the
need for a further two tracks. However, the bridge is a listed structure
and no major changes to it are allowed, so work began in 2000 on the new
Arsta Bridge carrying a further two tracks, and this new bridge was officially
opened by King Carl XVI Gustaf in August 2005. The 833 m long bridge runs
parallel to the old bridge at a distance from it of 45 m. This exceptional
building was designed by the office of top architect Sir Norman Foster,
Foster & Partner, London. This architecturally impressive structure uses color as a supportive and complementary element. The British planners decided on a design in Falun red, the traditional color of houses in Sweden, which helps the bridge blend into its scenic setting. Bayferrox* iron oxide pigments are the product of choice for coloration. The 19.5 m wide and 26 m high new Arsta Bridge stands on ten supporting columns with a 65 to 78 m span. Six of these are on land with foundations in the rocks, two in the Årstaviken River and two on the bed of the bay, each anchored down with 35 piles measuring 80 cm in diameter. The columns were reinforced with seven layers of iron (diameter: 32 mm). The whole structure weighs over 5,200 metric tons and consists of 23,000 m3 colored and 6,000 m3 uncolored concrete.
Clean colorful design High-quality colored concrete requires precise dosing of the pigments and even and adequate dispersion. The concreting process took place on a 130 m long construction platform fixed to the sections that had already been completed and supported on the next two stanchions. The concrete had to fulfill numerous technical requirements. Capacity for transport over long distances, pumpability and capacity for dispersal into the bridge structures were all important considerations. It was also essential for the concrete to retain its strength and be free of cracks. To prevent color tone variations, the encasing boards were filled with red-pigmented cement. Environmental protection was afforded top priority during the bridge
construction. Noise protection, air emissions, removal of legacy contamination
and use of environmentally friendly materials were high on the agenda.
Dyes and chemicals were tested to ensure they posed no environmental threat.
Read a recent Lanxess press release about; 'The Lanxess Group has now successfully concluded the sale of its Dorlastan fibers business to AKF and the Finnish Paper BU chemicals unit to Kemira.'
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