6.14.2. Key Tests Conducted

Try these first

1. 1.

   What does the fineness test measure?

   Hint

   Think about how smaller particles behave in a mix.

2. 2.

   What does the Loss on Ignition test indicate?

   Hint

   Consider what happens when fly ash is produced.

3. 3.

   What does fineness testing indicate about a mineral admixture?

   • It determines the color of the admixture.
   • It measures the reactivity and blending efficiency.
   • It indicates the time of setting in concrete.

   Hint

   Think about what makes fine particles useful in a mix.

4. 4.

   True or False: A higher Pozzolanic Activity Index means lower strength gain in concrete mixes.

   • True
   • False

   Hint

   Recall how we measure the effects of pokzolanic materials.

5. 5.

   You need to design a concrete mix that minimizes the effects of high water absorption in fly ash. Discuss how you would utilize specific tests before finalizing your mix design.

   Hint

   Think about benefits from specific properties of the admixture.

6. 6.

   Evaluate the appropriateness of using high-loss-on-ignition fly ash for a marine structure exposed to aggressive environments. What actions would you recommend?

   Hint

   Refer to implications of LOI on long-term durability.