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Compressive Strength Concrete slabs may vary greatly in compressive strength, measured in pounds per square inch (PSI). Most concrete roads are 4,000-6,000 PSI, while typical patios or sidewalks are about 3,000 PSI. Concrete Hardness PSI Critically hard                 8,000 or more Hard                                      5,000 – 8,000 Medium                                 4,000 – 6,000 Soft                                      3,000 or less concrete diamond blade To be continued

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