Aggregates are obtained by natural disintegration or by artificial crushing of rocks. The maximum size of coarse aggregate can be 80 mm.
In practice, jeera rodi classified as 10mm, has nearly 70% aggregate that passes through 10mm with nearly 90% ranging between 4.75mm and 10mm. Jeera rodi is mainly used in thin sections, closely spaced and heavy reinforcement. For better strength and mix proportions use a combination of 2 sizes 20mm down to 10mm down. The ratio should be between 60 : 40 or 70 : 30.