Correct Answer:
Option A - In the modern day construction the alternative of sand in concrete is taken as saw dust. But that saw dust should be chemically inert. So different processes are taken into account for that purpose. the most common method used for making the saw dust chemically inert is by boiling the saw dust in ferrous sulphate.
A. In the modern day construction the alternative of sand in concrete is taken as saw dust. But that saw dust should be chemically inert. So different processes are taken into account for that purpose. the most common method used for making the saw dust chemically inert is by boiling the saw dust in ferrous sulphate.