Tap TRUE or FALSE for each mix-design / mass-concrete statement.

Exercise and reference answers

Questions

1. Statement is true

   Yes

   Statement

   The Himsworth constant for 5% defective characteristic strength is 1.65.

2. Statement is true

   No

   Statement

   Liquid nitrogen used for cooling has a boiling temperature of −80 °C.

3. Statement is true

   Yes

   Statement

   One ton of refrigeration in the mass-concrete formula equals 12 000 Btu/hr.

4. Statement is true

   Yes

   Statement

   Latent heat of fusion of ice is taken as 80 cal/g in the heat-balance equation.

5. Statement is true

   No

   Statement

   Embedded post-cooling pipes are 100 mm outer diameter with a 5 mm wall.

Explanation