9.4. Shrinkage in Concrete

Try these first

1. 1.

   What is plastic shrinkage?

   Hint

   Think about what happens in hot weather.

2. 2.

   Name one method to control drying shrinkage.

   Hint

   What would you do to keep the concrete wet?

3. 3.

   What type of shrinkage occurs before concrete sets and is primarily caused by rapid evaporation?

   • A) Drying Shrinkage
   • B) Plastic Shrinkage
   • C) Autogenous Shrinkage

   Hint

   Remember the phase before the concrete hardens.

4. 4.

   True or False: Autogenous shrinkage occurs only with excessive water in the mix.

   • True
   • False

   Hint

   Focus on the reasons behind autogenous shrinkage.

5. 5.

   Consider a concrete structure that experiences significant plastic shrinkage. Identify potential design strategies that could be employed to minimize this issue.

   Hint

   Think about how to manage surface conditions rapidly.

6. 6.

   A recent study shows that a low water-cement ratio mix displays considerable autogenous shrinkage. Analyze the implications for long-term durability and suggest remedial actions.

   Hint

   Focus on how to maintain moisture in a low water scenario.