Shortage of river sand, has created a need for sand substitutes.
Quarry dust from crushing of rocks, can be upto 25% of the
aggregates produced. This is a significant amount, and it is
important to find alternate uses for it. Here we discuss its use as
a sand substitute in construction mortar.
A study done
in Tamilnadu came up with the following results.
Interestingly they found that quarry dust was superior to sand,
if one maintains the proper cement/aggregate ratio. Cement to fine
aggregate ratio (by volume) of less than 1:8 is not recommended.
- The Test results confirm that the performance of the crusher
dust as fine aggregate in brickwork is better
- than the natural river sand. The refined crusher dust without
micro fines below 150 micron contributes the maximum compressive
strength when compared to sand and unrefined dust.
- In brick prisms using bricks of average compressive 2 strength
of 4 N/mm , first failure occurs in the bricks for CM 1:4, 1:5
and 1:6 and not in the mortar joints.