Artificial Sand Making Machines
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Bajree Sand

 
 
 

  Artificial Sand

 
Natural sand are weathered and worn out particles of rocks and are of various grades or size depending on the accounting of wearing. The main natural and cheapest resource of sand is river. Dams are constructed on every river hence these resources are erasing very fast. Now a days good sand is not readily available, it should be transported from long distance. Those resources are also exhausting very rapidly. So it is a need of the time to find some substitute to natural river sand.

The artificial sand produced by proper machines can be a better substitute to river sand. The sand should be sharp, clean and course. The grains should be of durable material. The grain sizes must be such that it should give minimum voids. The presence of clay and silt retards the setting of the cement and makes the mortar weaker and the walls or the slab leaks and holds dampness.

The sand in the mortar does not add any strength but it is used as an adulterant for economy and with the same it prevents the shrinkage and cracking of mortar in setting. The sand must be of proper gradation ( it should have particles from 150 microns to 4.75 mm in proper proportion) When fine particles are in proper proportion, the sand will have less voids. The cement required will be less when there will be less void in sand. Such sand will be more economical.
Only sand manufactured by V.S.I. Crusher is cubical and angular in shape. Sand made by other types of machines is flaky , which is troublesome in working. There is no plasticity in the mortar. Hence the mason are not ready to work with machine made crushed stone sand. For the same reason inferior river sand may be used. Manufacturing sand from jaw crusher, cone crusher, roll crusher often contains high percentage of dust and have flaky particle. Flaky and angular particles may produce harsh concrete, and may result in spongy concrete.
There is standard specification for Fine aggregates (Sand). It is divided in four gradations. Generally known as Zone I, Zone II, Zone III and Zone IV. There is sieve Designation for each grade. Gradation is made as per the use of the sand. There are testing sieves for testing the sand. A set of Sieves with square hole is available. Followings are the sieves

  1. 4.75 mm,2.365,1.1830,600 microns,300 microns,150 microns
  2. pan

Specific percentage are designated for each size for each Zone sand in terms of material retained or passed `from the sieves.

Zone One Sand :

Sieve size
Percentage retained
Percentage passing
4.750
10 %
90-100 %
2.365
40 %
60-95 %
1.1830
70 %
30-70 %
600 microns
66-85 %
15-34 %
300 microns 80-90 % 5-20 %
150 microns 90-100 % 0-10 %

• Zone Two Sand :

Sieve size
Percentage retained
Percentage passing
4.750
10 %
90-100 %
2.360
25 %
75-100%
1.1830
45 %
55-90 %
600 microns
41-65 %
35-59 %
300 microns
70-92 %
8-30 %
150 microns
90-100 %
0-10 %

Where concrete of high strength and good durability is required Sand used should be of proper gradation. The concrete mix design should be done properly. When the sand of finer grade is used, the ratio of finer to coarse aggregates should be reduced. The fine to coarse ratio depends upon the particle shape, surface texture of both fine and coarse particles. The gradation of coarse and fine aggregate is very important. Very fine sand is not recommended for concrete purpose.

The fines content in the sand below 600 microns should be about 30 to 50 %. This will be a ideal sand for concrete work as well as masonry and plaster work.
At present it is generally observed that the fine content in river sand below 600 microns are very less. Such sand should not be used for concreting work.

Our Rotopactor Produces perfect sand of required gradation. Sand of any Zone can be produced. Sand from our Rotopactor is a perfect substitute for river sand.

 

 
 
 
 
 
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