Sand
Optimum properties are achieved when selecting the most suitable raw material. The sand is mostly preferred
from river, which is washed and should be with minimum 20% fines. Dust in sand increases the demand for water and
cement, without adding to the properties, it also increases shrinkage. A certain, small amount of fines contributes towards
strength. As in conventional concrete, the sand should be free of organic material or other impurities. Crushed sand, due to
sharp edges may destroy the foam mechanically. In this investigation, locally available river bed sand has been used.