In this part we will discuss the properties of concrete that affect the ability of a diamond blade or diamond core bit to cut concrete.
Factors Involving Concrete
When cutting concrete, several factors influence your choice of diamond blades. These include:
- Compressive strength
- Hardness of the aggregate
- Size of the a aggregate
- Type of sand
- Steel reinforcing (rebar)
- Green or cured concrete
The guidelines in this section of the workbook are for general reference only. Your best source for information on the characteristics of the concrete you have to cut is from the original contractor. Contact your local Department of Transportation or city hall for help in locating this information.
Concrete slabs may vary greatly in compressive strength, measured in pounds per square inch (PSI). Compressive strength in concrete is a measurement of the load carrying capability of concrete.
Concrete Hardness
Critically hard
Hard
Medium
Soft
PSI
8,000 or more
6-8,000
4-6,000
3,000 or less
Most concrete roads are 4-6,000 PSI, while typical patios or sidewalks are about 3,000 PSI
