5.4.10.2. Calcium Carbide Method

Try these first

1. 1.

   What gas is produced when calcium carbide reacts with moisture?

   Hint

   Think of the flammable gas that you use in welding.

2. 2.

   Why is moisture content important in concrete?

   Hint

   Consider how too much or too little water could change the mix.

3. 3.

   What is produced when calcium carbide reacts with water?

   • Hydrogen gas
   • Acetylene gas
   • Carbon dioxide

   Hint

   Think of the use of acetylene in welding.

4. 4.

   True or False: The Calcium Carbide Method is slower than the oven drying method.

   • True
   • False

   Hint

   Consider which method uses more time.

5. 5.

   You have a construction site using the Calcium Carbide Method. If the measured pressure indicates a moisture content of 5%, calculate the appropriate water needed for a 1m³ concrete mix with a water-cement ratio of 0.5.

   Hint

   Calculate the total water needed and adjust for the moisture content.