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   Difficulty                                  Aggregate Size

   Harder to cut                         1-1/2" or more
   (Blade wears slower)               1-1/2" - 3/4"
                                                     3/4" - 3/8"
   Easier to cut                              Pea gravel 
   (Blade wears faster)                 (Less than 3/8"     

Moh's Scale

      1-Talc                    6-Feldspar                      
          2-Gypsum              7-Quartz (Si02)
          3-Calcite               8-Topaz
          4-Fluorite              9-Corundum (Al203)
          5-Apatite              10-Diamond

Hardness of the Aggregate
There are many different types of rocks used as aggregate.  Hardness often varies even within the same classification of rock.  For example, granite varies in hardness and friability.

The Moh's scale is frequently used to measure hardness.  Values of hardness are assigned from one to ten.  A substance with a higher Moh's number scratches a substance with a lower number - higher Moh's scale numbers indicate harder materials.  The scale below shows how some common minerals fall into the Moh's scale range.

Aggregates are the granular fillers in cement that can occupy as much as 60% to 75% of total volume. They influence the way both green and cured concrete perform.  Aggregates can be naturally occurring minerals, sand and gravel, crushed stone or manufactured sand.  The most desirable aggregates used in concrete are triangular or square in shape; with hard, dense, well graded and durable properties.  The average size and composition of aggregates greatly influence the cutting characteristics and selection of the diamond blade.  

Large aggregates tend to cause blades to cut slower, and smaller aggregates allow the blades to cut faster.

   Moh's Range                 Description                          Aggregate

   8-9                                   Very Hard                  Flint, Chert, Trap Rock, Basalt, River Pebble                  
   6-7                                    Hard                         Hard River Rock, Hard Granite, Basalt, Quartz, Trap Rock
   4-5                                    Medium Hard            Medium Hard Granite, Some River Rock
   3-4                                    Medium                    Dense Limestone, Sandstone, Dolomite, Marble
   2-3                                    Medium Soft             Soft Limestone
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