Chemically Retarded

Aggregate is unaltered and depth can be measured to achieve desired texture

Acid Etching

Aggregate is unaltered and very little is exposed to achieve light etch and texture

Sandblasting

Aggregate will usually smooth from blasting, Depths greater then acid etching can be achieved for light to medium texture

 

        Each technique will achieve a different texture and finish as shown with angel stone above. there is truly no right way or wrong way to achieve exposed aggregate, Its all a matter of preference. Often when your looking for an exposed aggregate finish in concrete, Planners will over look the best way to expose the surfaces. This is a good time to inquire as to the experience that your contractor has. This is usually a specialty item. And we recommend to everyone, Ask to see some work that they have done. To be sure its what you want.

Chemical Retarders: Work on the principle of applying retarders to the surfaces to be exposed. This means applying a liquid or paint able surface retarder to all the form areas to be exposed (follow manufactures directions). Then once the form is full and vibrated to conform concrete to form. The then screened and floated horizontal surfaces are then sprayed with surface retarder (see Manufactures directions). There are many dangers when using chemical retarders, due to the possible leeching into the fresh concrete causing holes, irregular patterns, and blemishes. This method properly done will give the best results. Due to that it does not sacrifice the aggregate, and etch can be determined with chemical for a uniform finish.

Acid Etching: Today's acids are very powerful. They can achieve an etch of several mils. in green concrete or old concrete. acids like muratic and hydrochloric can also be used to help clean fine residues off retarded and sand blasted finishes.

Sand Blasted Finishes: Are very common in pre-casting, Tilt walls, and anytime an etched finish is desired in cured or hardened concrete. Sand blasting is also an excellent way to fix bad areas in concrete surfaces that exposed poorly, to improve and give a more uniformed look.

For more information check with product or service supplier for the desired finish you wish to achieve. or submit your inquires to our EXPERTS

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