White cement
White cement belongs to the group of Portland cements and is characterized by its low iron oxide content . White cement was invented by Walter Dyckerhoff and marketed for the first time in 1931 under the brand name Dyckerhoff Weiß .
Manufacture and use
The production of white cement is more complex than that of ordinary Portland cement. White cements are made from raw materials that are very low in iron (Fe 2 O 3 content <0.1%)
After firing, white cement clinker must be cooled quickly to <600 ° C in the absence of oxygen in order to remain white. That happens with water. The clinker is then broken and can then be cooled with air.
White cement is mainly used for terrazzo , exposed concrete and white plaster . It is not only suitable for light-colored preparations, but can also be more easily colored with color pigments than gray Portland cement, as the colors stand out better
Because of the water consumption, cooling raises sometimes considerable procurement problems in those countries that value white cement so much: In the Middle East and around the Mediterranean in particular , white cement is an important building material, as white reflects the sun and is highly regarded by society as a color of purity stands.
Resource-saving manufacturing processes are now also on the market that replace the water bath with a gas-cooled process in a cooling drum.
Individual evidence
- ↑ Balder Batran: Basic knowledge of construction . Handwerk und Technik Verlag, Stuttgart 2003, ISBN 3-582-03500-X , p. 113 .
- ↑ ZKG manual cement plant construction 2013/2014 ( Memento from March 4, 2016 in the Internet Archive )
- ↑ White cement cooler ( Memento from December 8, 2015 in the Internet Archive )
- ↑ What you need to know about concrete pavement ( Memento from September 19, 2015 in the Internet Archive )