2.5.2. Mixing Intensity and Productivity

Try these first

1. 1.

   Define a free fall mixer.

   Hint

   Think about how gravity is used in construction.

2. 2.

   What is the minimum slump required for free fall mixers?

   Hint

   Remember the challenges with handling stiff mixes.

3. 3.

   What is the primary function of a power mixer?

   • To mix materials using gravity
   • To mix rapidly with low slumps
   • To create a paste

   Hint

   Think about the advantages of rapid motion.

4. 4.

   True or False: Free fall mixers can handle very low slump mixes effectively.

   • True
   • False

   Hint

   Consider what happens with low slumps.

5. 5.

   A batching plant has a capacity of 15m³ and an efficiency rate of 75%. If the cycle time is 6 minutes, calculate the estimated production per hour.

   Hint

   Use the formula to dissect each term: batch size, efficiency, and cycle time.

6. 6.

   Discuss the impact of exceeding the mixing duration on concrete quality, providing concrete examples.

   Hint

   Think about factors affecting hydration and workability.