Define the Categories of Scaling?
Scaling is classified into following three categories:
i. Light scale - loss of surface mortar up to 5 mm deep, with surface exposure of coarse aggregates.
ii. Medium scale - loss of surface mortar from 5 mm to 10 mm deep, with mortar loss between the coarse aggregates.
iii. Heavy scale - loss of surface mortar from 10 mm to 25 mm deep; coarse aggregates are clearly exposed.