5.2. Precautions

Try these first

1. 1.

   What does segregation refer to in the context of concrete?

   Hint

   Think about what happens to materials in a mix when shaken.

2. 2.

   Why is it important to complete transportation of concrete within the initial setting time?

   Hint

   Consider how concrete changes as time passes after mixing.

3. 3.

   What is one major risk of concrete segregation?

   • Improved strength
   • Uneven texture
   • Faster setting time

   Hint

   Think about how mixing affects the overall look and feel.

4. 4.

   True or False: Moisture loss in fresh concrete is desirable.

   • True
   • False

   Hint

   Consider what keeping moisture maintains for the material's integrity.

5. 5.

   A construction site is located in an area experiencing extreme heat. The team must transport concrete 30 minutes after mixing. What measures should they take to ensure the concrete maintains its quality during transportation?

   Hint

   Consider what factors need to be controlled in hot conditions.

6. 6.

   During a rainy season, you are transporting concrete but accidentally left it uncovered. Discuss the potential impacts this can have on the final structural integrity and what steps could remedy some of these issues.

   Hint

   Think about the changes in composition due to excess water.