7.3. Factors Affecting Workability

Try these first

1. 1.

   What is the effect of increasing the water-cement ratio on workability?

   Hint

   Think about fluidity.

2. 2.

   What type of aggregate shape promotes better workability?

   Hint

   Remember about how aggregates roll.

3. 3.

   What happens to workability if the water-cement ratio is increased?

   • Decreases
   • Remains the same
   • Increases

   Hint

   Focus on fluidity.

4. 4.

   True or False: Angular aggregates improve workability more than rounded aggregates.

   • True
   • False

   Hint

   Think about how the shape affects movement.

5. 5.

   During a hot summer day, concrete mix is prepared with a high water-cement ratio. Analyze the potential effects this may have on both workability and final strength.

   Hint

   Consider the implications of water in the mix.

6. 6.

   In a project using angular aggregates, engineers report poor workability in concrete placement. Suggest strategies to improve the situation.

   Hint

   Focus on altering the physical properties of the aggregates.