3. Mix Design for High Performance Concrete

Try these first

1. 1.

   What is the typical range for the water-cement ratio in High Performance Concrete?

   Hint

   Think about the strength and workability aspects.

2. 2.

   Why is aggregate packing important in concrete mix design?

   Hint

   Consider how tightly aggregates can fit together.

3. 3.

   What is the preferred water-cement ratio for High Performance Concrete?

   • 0.4 to 0.5
   • 0.25 to 0.35
   • 0.6 to 0.7

   Hint

   Think about what helps prevent porosity.

4. 4.

   True or False: A higher aggregate packing leads to increased paste content required in a mix.

   • True
   • False

   Hint

   Consider the efficiency of packing in a concrete mix.

5. 5.

   Evaluate a proposed HPC mix design with a water-cement ratio of 0.40. Discuss the implications for strength and workability.

   Hint

   Assess how strength metrics are impacted by higher water ratios.

6. 6.

   Design a protocol for testing trial mixes in a new HPC bridge project. Include considerations for different environmental conditions.

   Hint

   Think about variables affecting strength like humidity, temperature, and material sources.