Diamond Blade Performance – Concrete Cutting C

Size of the Aggregate
The size of aggregate affects diamond blade performance. Large aggregates tend to make a diamond blade cut faster. The most common sizes of aggregate are:
Pea Gravel………..                                       Variable in size,  or less in diameter ¾”……………………..
usually 3/8”                                                      Sieved size

1-1/2”……………….                                    Sieved size
Hardness of the Aggregate
There are many different types of rock used as aggregate. Hardness often varies even within the same classification of rock. For example, granite varies in hardness and friability.
The Mohs scale is frequently used to measure hardness. Values of hardness are assigned from one to ten. A substance with a higher Mohs’ number scratches a substance with a lower number – higher Mohs’ scale numbers indicate harder materials.
The scale below shows the Mohs’ scale range. Aggregate hardness is one important factor when cutting concrete. Because hard aggregate dulls diamond grit more quickly and bring new, sharp diamond grit to the surface. Softer aggregate will not dull diamond grit to the surface. Softer aggregate will not dull diamond grit as quickly, so harder segment bonds are needed to hold the diamonds in place long enough to use their full potential. Most aggregates fall into the 2 to 9 range on the Mohs scale. Some commonly used aggregates measure this way on the Mohs’ scale.
Mohs’ Scale
1-Talc 2-Gypsum 3-Calcite 4-Fluorite 5-Apatite 6-Feldspar 7-Quartz(Si 02) 8-Topaz 9-Corundum (AI2 O3) 10-Diamond

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