Manufactured sand (M-Sand) produced using a Vertical Shaft Impactor (VSI) crusher is a high-quality alternative to natural river sand, widely used in construction due to its superior properties. Here’s a detailed breakdown of the process, advantages, and applications:
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1. How VSI Crushers Produce M-Sand
A VSI crusher uses a high-speed rotor to throw rock particles against a hard surface (anvil or rock-lined chamber), breaking them into finer, cubical-shaped particles through impact crushing.
# Key Steps:
1. Feed Material Selection:
– Hard rocks like granite, basalt, or limestone are ideal for producing well-graded M-Sand.
– The feed size typically ranges from 20–40 mm.
2. Crushing Process:
– Rocks are fed into the VSI crusher’s rotor, which accelerates them at high speed.
– Particles collide with the crushing chamber or other particles, breaking along natural fissures to produce cubical grains.
3. Screening & Grading:
– Crushed material is passed through vibrating screens to separate fine aggregates (0–4.75 mm) from oversize particles (recycled back into the crusher).
– Additional washing may remove excess fines (<75 microns) if required.
4. Final Product:
– Well-shaped, angular particles with consistent gradation (similar to IS 383 Zone-II standards).
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2. Advantages of VSI-Crushed M-Sand
– Cubical Shape: Enhances workability and reduces voids in concrete.
– Gradation Control: Adjustable rotor speed and cascade ratio optimize particle size distribution.
– Low Fines Content: Reduces water demand in concrete mixes compared to poorly graded crusher dust.
– Eco-Friendly: Reduces reliance on river sand, preventing environmental degradation.
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3. Applications
– Concrete & RCC Work: Improves strength due to better interlocking of particles.
– Plastering: Requires well-graded M-Sand with minimal fines to prevent cracks.
– Asphalt Mixes: Angular aggregates improve bonding with bitumen.
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4. Challenges & Solutions
| Challenge | Solution |
|———–|———-|
| High fines generation | Use air classification or wet washing systems. |
| Flaky/elongated particles |