14. Hot and Cold Weather Concreting – Fresh State Behavior

Try these first

1. 1.

   What is one effect of hot weather on fresh concrete?

   Hint

   Think about what happens to water in heat.

2. 2.

   Name one method to mitigate cold weather effects on concrete.

   Hint

   Consider ways to keep the mix warm.

3. 3.

   Hot weather can cause which of the following issues in fresh concrete?

   • Increased strength
   • Rapid evaporation
   • Slower setting
   • Lower water demand

   Hint

   Think about changes in water form due to heat.

4. 4.

   True or False: Accelerators can slow down the setting time of concrete.

   • True
   • False

   Hint

   What do you remember about the effect of these chemicals in colder temperatures?

5. 5.

   A construction crew is preparing to pour a large concrete slab during a heatwave. Outline a comprehensive strategy they could use to ensure successful placement and curing of the concrete.

   Hint

   What factors can reduce temperature effects?

6. 6.

   Discuss in detail how the freezing of water within concrete can affect its final properties and describe methods to prevent such freezing.

   Hint

   Consider both physical and chemical solutions.