River Sand vs Manufactured Sand

The natural river sand was the cheapest resources of sand. However the excessive mining of rive bed to meet the increasing demand for sand in construction industry has lead to the ecological imbalance in the state. Now the sand available in the riverbed is very coarse and contains very high percentage of silt and clay. The silt and the clay presence in the sand reduce the strength of the concrete and holds dampness. The natural river sand is the product of sedimentation. mica, coal, fossils and other organic impurities are present in the river sand above certain percentage which make the sand useless for concrete work.

M-sand is “crushed aggregates produced from hard granite stone which is cubically shaped with grounded edges, washed and graded with consistency to be used as a substitute of river sand”.

COMPARISON BETWEEN RIVER SAND AND M-SAND

Comparison of impurities 
River sand
M sand
Marine product 2- 4% Nil
Over-sized materials 6-10% Nil
Clay & Slit 5-20% Nil

 

SIEVE ANALYSIS

IS SIEVE
River sand (% passing)
M sand (%age passing) 
%age passing for single sized aggregate of normal sand (IS 383 – 1970) zone II
2.36 mm 93.5 78.25 75 to 100
1.18 mm 48 52 55 to 90
600 microns 21 38 35 to 59
300 microns 4 21 8 to 30 
150 microns 0.05 5 0 to 10

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