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Science & Tech.
Mahesh

31/01/23 07:38 AM IST

M Sand Projects

In News
  • Coal India Ltd (CIL) has envisaged processing the fragmented rock (known as Overburden Rocks (OB) for sand production in mines.
M Sand
  • M sand is a form of artificial sand, manufactured by crushing large hard stones, mainly rocks or granite, into fine particles, which are then washed and finely graded.
  • It is widely used as a substitute for river sand for construction purposes, mostly in the production of concrete and mortar mix
  • Sand is classified as a ‘minor mineral’. The administrative control over minor minerals lies with the State Governments and is regulated through state-specific rules.
  • Due to high demand, regulated supply, and a complete ban on sand mining during monsoon to protect river ecosystems, finding alternatives to river sand became necessary.
  • Sand Mining Framework (2018) prepared by the Ministry of Mines envisages alternative sources of sand in the form of Manufactured Sand (M-Sand) from crushed rock fines (crusher dust), and sand from Overburden (OB) of coal mines.
Benefits
  • It can be produced in large quantities at a lower cost.
  • In grain size and shape, which can be beneficial for construction projects that require a specific type of sand.
  • Helps reduce the need for mining natural sand, which can have negative environmental impacts.
  • Additionally, using the overburden from coal mines can help to repurpose materials that would otherwise be considered waste.
  • Lesser Sand extraction from the river will reduce erosion of channel beds & banks and protect the water habitat
  • Help maintain the water table
Issues
  • Due to its smooth and angular textures, it leads to more water and cement requirements to achieve the expected workability, thereby increase in overall costs.
  • If the M Sand contains a large number of micro fine particles, it can affect the strength and workability of concrete.
Source- PIB

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