2.5.1. Design and Configuration

Try these first

1. 1.

   What is a free-fall mixer?

   Hint

   Think about how gravity affects the materials.

2. 2.

   Define mixing duration.

   Hint

   What do we need to achieve a homogeneous mix?

3. 3.

   What mechanism does a free-fall mixer primarily rely on?

   • Gravity
   • Electricity
   • Pneumatics

   Hint

   Think about what happens in nature.

4. 4.

   True or False: Power mixers are suitable for low slump mixes.

   • True
   • False

   Hint

   Consider what makes a mix stable.

5. 5.

   A pan mixer has a maximum batch size of 12m³ and operates with an 85% efficiency. If its cycle time is 4 minutes, calculate its hourly production rate. Assume the total operational time per hour is 60 minutes.

   Hint

   Think about how efficiency and time interact to affect total output.

6. 6.

   You are tasked with optimizing a trough mixer that currently operates at 60% efficiency. If you increase the efficiency to 75%, how much more concrete can you expect to produce in a standard 8-hour shift, assuming the batch size remains constant at 10m³ and cycle time is 5 minutes?

   Hint

   Calculate the production rate adjustments based on efficiency.