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Fly Ash – What Good Is It?

September 29, 2015

What good is Fly Ash? – Well for CastleLite Block it has no value for us at all.

One reason CastleLite Block makes superior concrete pavers and retaining wall block is we do not use fly ash in our products.  Some of you may not know what fly ash is, so I will explain.

When coal plants burn coal, the ash that is left over is called fly ash.  Concrete manufactures use fly ash as a substitute for cement because it is cheaper than cement and it does not reduce the strength of the concrete products.  Using fly ash in concrete for sidewalks, walkway and driveways is fine, because the color is always gray.

However in hardscape design, we use color in our concrete pavers and Retaining Wall products and the color of these products is very desirable.  Some of our competitors substitute up to 30% of the Cement with Fly Ash.  The main reason CastleLite Block does not use fly ash in our concrete paver and retaining wall block is because it makes the product look flat or bland.  Fly ash is darker in color than cement and it makes the concrete pavers and retaining wall block darker in color.  We add color to our concrete pavers and retaining wall block to make our color blends vibrant and attractive.  Then to add fly ash will only diminish the color appearance of our products.

So if you are out looking at concrete pavers and retaining wall block ask the salesman if they use fly ash in their mix.  Most probably don’t know, in which you can conclude that they probably do add fly ash.  If there was no fly ash in the mix, they would know.  Looking at product by itself, you may not be able to see the difference, but when you put our concrete pavers and retaining wall block next to product that has fly ash it becomes quite apparent that CastleLite Block Concrete Pavers and Retaining Wall Block look brighter and more vibrant.  The non-use of fly ash is just one component that makes CastleLite Block Concrete Pavers and Retaining Wall Block look different than other products.

Our entire product line is free of fly ash. This includes walkway pavers, driveway pavers, patio pavers, & retaining wall block.

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