Concrete Hardness and Diamond Tool Selection in Australia
Without a good understanding of concrete hardness and why it matters, contractors run into common issues during grinding, such as glazing of diamond tools, excessive tool wear, slow grinding speeds and poor surface finishes. Floorex Products is proud to be an Australian-owned family business specialising in concrete grinding tools, diamond tooling and surface preparation equipment. Call Floorex Products for professional advice.
How To Identify Concrete Hardness?
Concrete hardness is how hard a slab is when it comes to being abraded during grinding and surface preparation. Although there are lab testing methods that provide a reference, such as the Mohs scale, when it comes to grinding and surface preparation, it’s normally determined by noting scratch tests, diamond tool behaviour and aggregate exposure during grinding. Many variables can affect hardness, such as aggregate type, age of concrete, moisture and curing conditions, and even location in Australia, which can create different hardnesses on slabs poured the same day within the same surface.
Why Does Hardness Matter?
Concrete hardness will affect the way your diamond grinding tools cut into the slab. The harder the concrete, the more resistant it is to cutting, which creates heat and causes your diamonds to glaze over. If the concrete is too soft, your diamonds will wear out more quickly if the bond isn’t matched to the slab’s hardness. Choosing the right tools for the job will allow faster cutting speeds, a better finish, longer tool life and fewer unnecessary tool changes.
How to Identify the Hardness of a Concrete Slab
Concrete’s hardness can be determined by measuring surface reactions during the first on-site grinding operations. While soft concrete cuts quickly and creates dust, hard concrete grinds more slowly and finishes with a polished appearance.
Matching Diamond Tools to Concrete Hardness
Soft concrete contains materials that are less dense than usual or have an excessive amount of moisture and it shows high diamond wear rates when the wrong tools are used. Hard-bond diamond grinding tools offer continuous cutting performance and help prolong the life of equipment. Medium-bond diamond tools are effective on medium-sized concrete slabs, which are the most common type. Due to its high density, hard concrete resists wear, but it also produces too much heat, which can result in diamond glazing. As they enable rapid diamond release without sacrificing cutting efficiency, soft-bond diamond grinding tools work best on these slabs.
Additional Elements Influencing Tool Selection
The hardness of the concrete, the weight and speed of the grinder, the desired surface finish, the size of the diamond grit and the requirements for managing dust or slurry are some of the variables that affect the choice of tool.
Matching Diamond Grinding Tools to Concrete
Diamond grinding tools must be matched to the concrete’s specific hardness in order to produce effective, high-quality concrete surface preparation. In addition to offering trustworthy equipment and professional knowledge, Floorex Products has set up local support services for all professionals in the industry.
For tailored advice on diamond tools suitable for soft, medium and hard concrete or a detailed quote, contact the Floorex team.