Civil Engineering - Concrete Technology - Discussion

By replacing sand with dust strength increases. We have performed this test in the lab. We replaced the sand with crusher dust and as we were increasing the percentage of dust the corresponding strength also increased.

Dust have increased shrinkage will be occur.

Dust has less permeability or leads to clogging, so it leads to a decrease in workability due to its sticky nature, too.

The maximum permissible dust content in aggregates is generally 5% for coarse aggregates and up to 10% for fine aggregates in low-workability mixes, according to standard construction specifications.

For high-workability mixes using fine aggregates, the limit can be as high as 20% of the total aggregate mass.