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White Portland cement is used in combination with white aggregates to produce white concrete for prestige construction projects and decorative work. White concrete usually takes the form of pre-cast cladding panels, since it is not economical to use white cement for structural purposes
In some countries an off-white clinker, which gives a reflectance value over 70 when ground, is produced at a cost only a little over normal gray clinker.
When this is blended with ground blast furnace slag (up to 60% depending on use and early strength) a cement with reflectance over 80 can be produced. The blended cement can have a production cost less than General Purpose Portland cement (gray), but normally attracts a margin as it is sold to compete with white Portland cement.
Clinker grinding and handling
The clinker is next ground to cement (perhaps after a drying stage). Here calcium sulfate is added to control set, in the form of a high-purity grade of gypsum or anhydrite. In some specifications (not ASTM), a small amount of titanium dioxide may be added to improve reflectance. At all stages, great care is needed to avoid contamination with colored materials
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