What aggregates are suitable for use in white concrete?
This can best be answered by saying what aggregates should be avoided. Dark aggregates are likely to show through the surface at those places where there is only a thin layer of cement paste over them. Sometimes these will mar the appearance of the concrete. Unwashed and contaminated aggregates should be particularly avoided. Fine aggregate has a stronger influence on the color of white concrete than does the coarse aggregate and, where desired, the color may be modified to some extent by the choice of the color of fine aggregate.