Manufactured Sand is produced by feeding hard stones of varying sizes to primary and Secondary crushers (Jaw crusher and Cone crusher), for size reduction and these crushed Stones are further crushed in Vertical Shaft Impact (VSI) crusher to reduce the particle size to that of sand. The VSI crusher by its unique design and action of attrition produces well shaped fine aggregate particles that are cubical and angular. The process of attrition also enables the reduction of surface roughness of the fine aggregate particles to some extent.
The fine particles obtained, as a by-product during crushing of rocks to produce coarse aggregates (by jaw crusher and/or cone crusher) is known as Crusher Dust/Quarry Dust. This often contains higher percentage of dusty, flaky particles and particle sizes are un-controlled. This is not suitable for construction, as they result in higher water demand leading to lack of control on workability / retention of workability as well as strength issues.