Due to controlled conditions of manufacturing, manufactured sand achieves optimum shape and grade. This is particularly helpful in optimizing cement use. In addition, both compressive strength and flexural strength (bend strength or stress strength of the material) is improved by using cubical aggregates produced. M-sand offers markedly improved workability and reduced bleeding and shrinkage.
Minimum void content
Since the particles of M-Sand are evenly shaped and sized, and fine in nature, the amount of void in the concrete is reduced, making it even more durable.
Natural sand often contains undesirable minerals and clays, and these can affect the quality of concrete produced. The use of manufactured sand, however, reduces the risk of impurities.
Manufacture of M-Sand
Feed size generally varies from -400 mm to -550 mm.
The output of Jaw crusher is fed to Secondary crusher i.e. a Cone Crusher. The feed size -150 mm rock is crushed to -40 mm size. Cone crusher consists of two truncated cones with different diameters. These two truncated cones are called Concave and Mantle, which are made of Manganese alloy. Rocks are crushed in between the chamber of Concave and Mantle.
M-Sand for Concrete and Brickwork- Its granule thickness/sieve size is 150 Microns-4.75 mm and adheres to IS Code 383:1970.
This is the final crushing stage, where the output of Cone Crusher is fed to Vertical Shaft Impactor (VSI) through screens. M-sand is produced from the output of VSI as an end product. The VSI crusher, by means of its unique design and action, produces well-shaped fine aggregate particles. The cubicle structure of particles is imparted in the sizing chamber of VSI, making the product most amenable for construction. Usually, -40mm-sized rocks can be reduced to varied sizes, ranging from -20mm to -2mm.
When the stones are processed through the Vertical Shaft Impact Crusher, not only fine aggregates, but also coarse aggregates, another end product, acquire improved particle shape and reduced surface roughness. Manufactured Sand plants ensure better grading of fine aggregates for better particle size distribution. Few plants are equipped with air filter systems and/or washing facilities, which maintains micro fine sand particles (the ones passing 75 micron) 3% by weight.
Washing provides an added benefit of keeping Manufactured Sand wet or in partially wet conditions. This helps reduce the water absorption rate of Manufactured Sand concrete preparation which in turn contribute to the better workability and workability retention.
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