Concrete Sand:

1: What is Manufactured Sand?

Manufactured Sand is primarily used for Construction Purpose and is produced from Hard Granite Stone by Crushing. As per IS Standards for Concrete and Plaster and even for Coarse Aggregates. This is an Absolute Alternative for River Sand.


2: In What Way does it differ from Natural River Sand?

Natural Sand does not have any Uniform Particle Size Gradation and can’t be used directly without Sieve and Processing. Natural Sand has Clay, Silt, Bones and Contamination.


3: What color is it?

Since Manufactured Sand is made from Granite Stone, this is Grey in Colour.


4: What is dust/CRF (crushed rock fines)?

While making Aggregates/Jelly (20mm, 12mm & 40 mm), there are Wastage during Production. This is called CRF (Crushed Rock Fines).


5: What are 3 Stage Crushing Process?

Jaw, Cone, VSI are the Three Stages in Crushing Process. This is meant for Aggregates Manufacturing and not for Sand. Sand Manufacturing has to Follow a 5 Stage Process.


6: What is VSI?

VSI – Vertical Shaft Impactor, is the Stage where every single stone will be Properly Shaped and Grounded. This enables us to achieve the Strength and other Parameters of the Aggregates.


7: Why We Need Classification Method?

Classification id is required to segregate the wastage while Manufacturing Sand. After crossing 4th Stage, Sand will have more than 150 microns percentage and less than 150 microns as well. The less than 150microns should be controlled as per IS Spec.Micro Fines in Concrete Sand will affect the Concrete Parameters.
In Plastering Sand we should Maintain 150 microns as per the Standard.


8: Types of Classification Method?

1.Wet Classification Method (Washing) Wet Classification is a comparatively Older Technology to remove Micro Fines (clay) to improve the quality of Manufactured Sand. As this consumes more Water, it is not Environmental Friendly. 2.Dry Classification Method (Air Blowing Effect) Dry Classification does the same job without Consuming Water. This is Eco Friendly Process.


9: What is the 5 Stage Process?

1. PJC – Primary Jaw Crusher, 2.SCC – Secondary Cone Crusher, 3.VSI – Vertical Shaft Impactor, 4.HSS-High Speed Frequency Screen, 5.DC – Dry Classifier.


10: Difference between 5 stage & 3 stage process?

3 Stage process is recommended for Aggregates Manufacturing. Sand should be Manufactured by 5 Stage Process.


11: Is There Any Wastage while manufacturing sand in 5 Stage Process?

When the Sand is Manufactured by the 5 Stage State Of The Art Process, it will be having Wastage around 15 %. During Final Stage (i.e.) Classification Stage, the Wastage will be 150 Microns. This has to be mixed with Soil and Disposed Carefully.


12: What are Advantages over Quality River Sand?

1. Cost Benefit. 2. Ready to Use - No Need to do Further Sieve. 3. Savings in Labor Cost. 4. No Silt, Bones, Organic Impurities and Contamination in Manufactured Sand.


13: What IS standard should the concrete sand have?

For the Application of Concrete, as per IS: 383 Reaffirmed 19__ Standard.


14: What is 150 microns, what percentage should be maintained?

150 microns is finer particles, it should not be more than 15 % percentage. Thriveni Sands maintains less than 15 %.


15: What is the impact of excess 150 microns?

More of 150 microns will lead to failure in concrete strength and this is considered as clay. So this has to be controlled to less than 15% in manufactured sand.


16: Difference between CRF, VSI Sand, properly manufactured sand?

CRF – Crushed Rock Fines are 30% of the Crushed Powder Wastage while making Aggregates, this will not fair as per IS 383 Standard.


end faq

Plaster sand:

1: What is Plaster Sand?

Plaster Sand is Manufactured Primarily for Plastering Purpose.


2: What is the difference when compared to River Sand?

1. Ready to Use, 2.No Need to Process Further, 3. No Wastage.


3: What is the difference between M sand & Plaster Sand?

M Sand is applicable for Concrete. It Confirms IS 383 Standard. This will be having Coarser Sand with certain Percentage (below 4.75 mm). Plaster Sand will be starting from 2.36 mm.


4: Why can’t I use M Sand for Plaster Application?

M Sand is meant for Concrete, the Particle Size passing for M Sand and Plaster Sand is different.


5: Can this be Directly Used?

This can be directly used as 100% Alternate Substitute to River Sand.


6: How is the Surface Finish?

We can achieve better Surface Finish than River Sand. This is manufactured as per the Standard. Uniformity of Particle Size distribution is in Plaster Sand.


7: What kind of impact will occur when there is excess of 150 microns in this plaster sand?

Excess of 150 microns will lead to Crack Formation after Completion of Project.

end faq