Types of aggregate

Maximum utilization

Plain concrete (%)

Reinforced concrete (%)

Lean concrete (Less than M15 Grade) (%)

1.   Coarse aggregate

(a)  Iron slag aggregate

50

25

100

(b)  Steel slag aggregate

25

Nil

100

(c)  Recycled concrete aggregate (RCA)

25

20 (Only upto M25 Grade)

100

(d) Recycled aggregate (RA)

Nil

Nil

100

(e)  Bottom ash from thermal power plants

Nil

Nil

25