Environmental factors and shortage of good quality river sand has led to the invention of Manufactured Sand Also known asM Sand or Robo Sand

 

ParametersM SandRiver Sand
ProcessManufactured in factory.Naturally available on river banks.
ShapeAngular and has rougher texture. Angular aggregates demands more water. Water demand can be compensated with cement content.Smoother texture with better shape. Demands less water.
Moisture ContentMoisture is available only in water washed M Sand.Moisture is trapped in between the particles which is good for concrete purposes.
Concrete StrengthHigher concrete strength compared to river sand used for concreting.Lesser concrete concrete compared to M Sand
Silt ContentZero siltMinimum permissible silt content is 3%. Anything more than 3% is harmful to the concrete durability. We can expect 5 - 20% slit content in medium quality river sand.
Over Sized Materials0%. Since it is artificially manufactured.1 - 6% of minimum over sized materials can be expected. Like pebble stones.
Marine Products0%1 - 2% like sea shells, tree barks etc
Eco Friendly Though M Sand uses natural coarse aggregates to form, it causes less damage to environment as compared to river sand.Harmful to environment. Eco imbalances, reduce ground water level and rivers water gets dried up.
PriceM Sand price ranges from Rs.35 - Rs.45 per cubic feet in Bangalore.River sand price ranges from Rs 60 - 80 per cubic feet in Bangalore.
Adulteration Probability of adulteration is less.High probability of adulteration since filtered sand (a type of pre-washed sand which contains high silt contents) are mixed together. As a rule, supply shortage always brings adulterer products to the market.
ApplicationsHighly recommended for RCC purposes and brick/ block works.Recommended for RCC, plastering and brick/ block work.
Quality Better quality control since manufactured in a controlled environment.No control over quality since it is naturally occurring. Same river bed sand can have differences in silt contents.
Particle passing 75 micronUp to 15% (IS: 383 - 1970)Up to 3% (IS:383 - 1970)


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