Using a Mohs hardness test kit on concrete is a simple way to determine the surface hardness of the material. Here’s how you can do it effectively:

Steps to Use a Mohs Hardness Kit on Concrete:

1. Clean the Surface – Ensure the concrete surface is free of dust, dirt, or coatings that could affect the test.

2. Start with a Lower Hardness Pick – The kit comes with metal picks labeled from 2 to 9 (representing hardness levels on the Mohs scale). Begin with a pick that has a lower hardness rating, such as 4 or 5.

3. Scratch the Surface – Hold the pick at a 45-degree angle and apply firm, consistent pressure to scratch the concrete. Use a short, straight stroke (about ¼ to ½ inch).

4. Check for a Scratch – Wipe away any debris and inspect the surface:

   • If the pick leaves a visible scratch, the concrete’s hardness is equal to or lower than that pick’s hardness.

   • If it doesn’t leave a mark, move to the next higher hardness pick and repeat the process.

5. Determine the Hardness – Continue testing with progressively harder picks until you find the first one that does not scratch the concrete.

   • The last pick that left a scratch represents the approximate Mohs hardness of your concrete.

Typical Mohs Hardness of Concrete:

• Standard concrete usually falls between 4 and 7 on the Mohs scale, depending on its composition, curing process, and surface treatment.

• Softer concrete (low-strength mixes) may be around 4-5, while high-strength, polished concrete can be 6-7.

Why Test Concrete Hardness?

• Helps determine abrasion resistance for flooring.

• Useful for selecting the right diamond tooling in concrete grinding or polishing.

• Identifies wear resistance for industrial applications.