Reliable coloring of ultra-high performance concrete with Bayferrox pigments from LANXESS | APN News
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Reliable coloring of ultra-high performance concrete with Bayferrox pigments from LANXESS
Posted on May 1, 2021
Cologne: Ultra high performance concrete (UHP) is considered the building material of the future. When colored, however, you must ensure that the prescribed compressive strength of over 150 megapascals is still achieved. LANXESS’s Bayferrox brand iron oxide pigments are ideal for UHPCs, as verified by the German Cement Association (VDZ) on the basis of a compressive strength analysis conducted according to DIN EN 12390-3.
“Architects and customers can be confident in our high-quality pigments for UHPC coloring,” says Oliver Fleschentraeger, Construction market segment manager of the Inorganic Pigments business unit at LANXESS. Iron oxide pigments are available in red, yellow and black, with many color shades possible in these shades. “As far as we know, Bayferrox pigments are the only iron oxide pigments on the market that are specially certified for use in UHPC,” says Fleschentraeger.
Pressure resistant, colorful and environmentally friendly
The quantity of materials used is a key parameter to assess the carbon footprint of a building. Not only the choice of materials, but also the production line and construction process are also crucial. Thus, to save materials and energy and reduce CO2 emissions during manufacturing, planners and architects are increasingly using highly sophisticated high performance components made of BUP. Besides huge resource savings of up to 80%, material-friendly designs reduce carbon dioxide emissions in the manufacturing phase by up to 30%. “A significant and pleasant side effect of UHPC is its high resource efficiency, which makes it easier for engineers to meet the demand for sustainable designs,” says Dr Michael Olipitz, a certified expert in the fields of superstructure, of bridge construction and steel structure and structural engineering, and general manager of the design office SDO ZT GmbH based in Graz, Austria. Inorganic iron oxide pigments can provide a lasting visual enhancement to these structures or even effectively contextualize them with their surroundings – without affecting the rheology or flow behavior of concrete.
Delicacy and solidity go hand in hand
A spectacular architectural application of the colorful UHPC is the Museum of European and Mediterranean Civilizations (MuCEM) in Marseille, southern France. With the exception of two glass façades, the museum – including most of the roof – is encased in a concrete lattice structure comprising concrete panels only 10 centimeters thick. French architect Rudi Ricciotti made the conscious decision to color the concrete dark gray to give the building its own identity in its surroundings and as a stark contrast to the color of the facade. The precast concrete elements were colored with Bayferrox 330 and Bayferrox 318 from LANXESS.
Another advantage of high quality Bayferrox pigments is that the concrete, when colored, retains its characteristic texture and exhibits subtle shades of color, giving the surface a natural look. In addition, no coat of paint can peel off the surface due to wear and weather. Even if the surface is slightly damaged, the color is still just as vivid. This is why iron oxide pigments are the ideal choice for coloring ultra-high performance concretes which, with a projected life of over 150 years, are approximately twice as durable as conventional concrete.