Shot Blasting

What is Shot Blasting?
    
Shot blasting is the recommended method of surface preparation of concrete for most polymer floor installations. It is also a very cost effective and efficient way to remove existing thin layer coatings. Shot blast equipment utilizes an alloy wheel spinning at high speeds to throw small steel particles(or shot) at the substrate in a controlled, dry, 99% dust free operation. This process removes surface contamination, adds profile and simultaneously vacuums the concrete clean in one process. The size and angularity of the shot, along with the travel speed of the unit, can be adjusted to determine the degree of the surface profile. Because shot blasting is a dry preparation process, it allows the installation of coatings to begin immediately after completion of prep(surface must be dry before blasting). Shot blasting will also identify weak areas in the surface of the concrete.
    Note: When selecting shot blast preparation for thin film coating systems be aware that a blast pattern or "blast lines" may be visible.

    Shot blasting- the method of surface preparation recommended by most coating manufacturers and floor preparation contractors.

    Shot blasting eliminates the use of expensive, non-eco friendly, harsh chemicals (muriatic acid) and leaves the concrete floor with the desired profile without any chemical residue or time consuming cleanup.

    Shot blasting
    is known for high production rates, wide abrasive selection and blast pattern accuracy.

    Shot blasting
    lends itself to efficient disposal of dust and other contaminants.

    Shot blasting can be performed outdoors and indoors.

    Shot blasting can be performed with little disruption to daily operations.

    Industry guidelines for creating surface profiles

    The International Concrete Repair Institute (ICRI)
    has created a technical guideline #03732,

    “Selecting and specifying concrete surface preparation for sealers, coatings, and polymer overlays.” This guideline provides concrete surface profiles of CSP 3 to 9 which are used under the following conditions.

    • For coating applications from 4–5 mils in thickness, the surface profile shall be a CSP 3.
    This is known as a light shot blast.

    • For coating applications from 15–50 mils in thickness, the surface profile shall be a CSP 4
    or 5. This is known as a medium shot blast.

    • For coating applications from 40 mils to 1/8" in thickness, the surface profile shall be a CSP 5
    or 6. This is known as a medium-heavy shot blast.

    • For topping applications from ¼" to ½", the
    surface profile shall be a CSP 6 or 7. This is
    known as a heavy shot blast.

    • For concrete overlays greater than ½", the
    surface profile shall be a CSP 8 or 9. This is
    known as an extreme shot blast.

     

     

     

    CSP 1
    (Acid Etched)

    CSP 2
    (Grinding)

    CSP 3
    (Light Shot Blast)

     

     

     

    CSP 4
    (Medium Shot Blast)

    CSP 5
    (Medium/Heavy Shot Blast)

    CSP 6
    (Heavy Shot Blast)

     

     

     

    CSP 7
    (Heavy Shot Blast)

    CSP 8
    (Extreme Shot blast)

    CSP 9
    (Extreme Shot blast)

    International Concrete Repair Institute (ICRI) Concrete Surface Profile (CSP) Scale
    (Concrete Surface Profile pictures are used with permission and as a courtesy of the International Concrete Repair Institute)

        

    Blastworx  maintains multiple shot blasting machines from 8 inches  to 15 inches, which gives us the ability to complete projects as effectively and efficiently as possible.

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