Abstract
A number of rhombohedral alites have been prepared using impurities of the type likely to be found in the alites of commercial cements. These alites when ground to 330 m 2/kg developed between 25 and 90% more compressive strength at 28 days than monoclinic or triclinic alites. X-ray diffraction of alite pastes, in which hydration was arrested, indicates that rhombohedral alites yield higher strengths not only because they react more vigorously with water but, for the same degree of hydration the hydrates from rhombohedral alites contribute significantly more to strength. A mixture of rhombohedral alite with C 3A and CaSO 4. 1 2 H 2 O . developed much higher strengths at a given age than a similar mixture with triclinic alite.
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