14.2. Cold Weather Concreting

Try these first

1. 1.

   What is the primary risk when placing concrete in cold weather?

   Hint

   Think about what happens to water when it freezes.

2. 2.

   Name one method to prevent freezing of concrete.

   Hint

   Consider how we maintain heat.

3. 3.

   What happens to water in concrete when it freezes?

   • It contracts
   • It expands
   • It vaporizes

   Hint

   Remember the physics of freezing water.

4. 4.

   True or False: Adding more water to the concrete mix in cold weather is beneficial.

   • True
   • False

   Hint

   Consider the effect of water on freezing.

5. 5.

   A construction crew plans to pour concrete in a region where winter temperatures can drop to -5°C. Discuss the various strategies they should implement to ensure successful concrete placement.

   Hint

   Reflect upon temperature management techniques.

6. 6.

   Analyze the benefits and drawbacks of using calcium chloride as an accelerator in cold weather concrete. What are alternative methods if one wishes to avoid this chemical?

   Hint

   Consider the impact of chemical additives vs. physical methods of heating.