7.1.1. Workability

Try these first

1. 1.

   What is workability in concrete?

   Hint

   Think about how easy it is to handle wet clay compared to dry.

2. 2.

   Name one factor that influences the workability of concrete.

   Hint

   Consider how adding more water affects playdough.

3. 3.

   What is the main purpose of workability in concrete?

   • To enhance strength
   • To relieve stress
   • To ensure ease of placement

   Hint

   Think about how you would want to handle wet sand.

4. 4.

   True or False: Higher water-cement ratios always contribute positively to strength.

   • True
   • False

   Hint

   Consider how adding too much water can affect density.

5. 5.

   A construction site uses a concrete mix with a water-cement ratio of 0.75. During testing, the slump is measured at 200 mm. Assess whether this is desirable for a residential application, and suggest adjustments to improve workability if necessary.

   Hint

   Think about how high workability affects strength.

6. 6.

   In conditions of high ambient temperature, a concrete batch is experiencing quick slump loss. Outline steps to mitigate this issue and maintain desired workability.

   Hint

   Consider the relation between temperature and setting time.