CONCRETE BUILDING PRODUCTS

摘要

The invention relates to the manufacture of concrete roof tiles having increased early strength. In particular, this is produced by including crushed waste concrete in the cementitious mixture. For example, the increased strength is obtained if (i) crushed waste concrete is used as a replacement for aggregate; (ii) crushed waste concrete is used as a nucleating agent; and (iii) crushed waste concrete is graded such that it can be used to replace aggregate and to effect nucleation.