WHAT IS SANDBLASTING?

Sandblasting
Sandblasting

Sandblasting

Sand blasting is the process of roughening and cleaning the surface of old and set concrete (or in any corroded steel surface) by means of coarse sand and air applied under pressure of 90 to 100 pounds per square inch (6.33 to 7.03 kilogram per square centimeter) through a nozzle, so as to erode the laitance and grout from the old and fresh concretes monolithic.

Sand blasting of rock is also done so that concrete may be placed on or against a clean surface as required according to specifications.

There are two types of sand blasting, namely “wet sand blasting” and “dry sand blasting“. In wet sand blasting water is also used along with sand and air under pressure, while in the latter, only sand and air under pressure are used. Normally the concrete and rock surface etc., are wet sand blasted to keep down the dust.

The percentage of different sizes of sand particles for efficient sand blasting shall be as follows:

Size

Percentage

8 mesh per inch (25.40 mm)

26

16 mesh per inch (25.40 mm)

30

30 mesh per inch (25.40 mm)

23

50 mesh per inch (25.40 mm)

21

 

For effective sand blasting it is essential that pressure of air should be between 90 to 100 pounds per square inch (6.33 to 7.03 kilograms per square centimeter). If pressure falls below 90 pounds per square inch (6.33 kilograms per square centimeter), sand blasting becomes in effective. If sand having large percentage of fines is used, it will not provide the requisite cutting power and the whole effort goes waste. A good quality well graded “sand-blast-sand” is needed for achieving the objective of sand blasting.

4 thoughts on “WHAT IS SANDBLASTING?”

  1. Thanks for helping me understand more about sandblasting. I thought it was interesting to learn that there were different sizes of sand particles used, and that it can effect it’s efficiency. I’m kind of curious to learn if there are different situations where different sizes would be recommended more than others, or if it’s just recommended to have a 16 mesh per inch.

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  2. Sandblasting is technique used to clean the surface of any material, mostly metallic surface. It is one of the most efficient and quick method which uses compressed air to blast fine sand through a nozzle to shape and smooth surface of any foreign material. It is well suited for the removal of rust which causes property damage.

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