9.11. Surface Hardness and Abrasion Resistance

Try these first

1. 1.

   Define surface hardness in the context of concrete.

   Hint

   Think about how hard the surface feels.

2. 2.

   What does abrasion resistance measure?

   Hint

   Consider wear from traffic on the surface.

3. 3.

   What is the main purpose of measuring surface hardness?

   • To determine compressive strength
   • To assess wear resistance
   • To evaluate curing techniques

   Hint

   Think about what happens in high-traffic areas.

4. 4.

   True or False: A higher water-cement ratio improves abrasion resistance.

   • True
   • False

   Hint

   Consider the effects of too much water.

5. 5.

   A manufacturer has a choice between a high and low water-cement ratio for their concrete flooring. Explain the trade-offs between each option and the implications for surface hardness.

   Hint

   Consider the direct effects of water content on concrete strength.

6. 6.

   Considering aggregate types, how would the choice of aggregate impact the design of a concrete tennis court surface in terms of hardness and wear?

   Hint

   Think about how different materials wear down over time.