11 Questions
Which type of concrete must have a minimum strength of 15 MPa (2,200 psi)?
Both non-reinforced and reinforced concrete
What is the minimum strength required for basement floors?
20 MPa (3,000 psi)
Why is air entrainment required for exterior applications?
To reduce degradation caused by de-icing salts and exposure to freezing temperatures
Which test is used to gauge the consistency and workability of concrete?
Slump test
What is ready-mix concrete?
Concrete manufactured in plants
What should the water and aggregate used for on-site mixing be free of?
Organic material
What is the recommended water to cement ratio for garage and carport floors?
0.45
Which temperature range requires concrete to cure for an additional three days?
Between 10°C (50°F) and 21°C (70°F)
What can be used to maintain moist conditions for curing when water curing is not practical?
Spray-on curing compounds
What should be done to protect freshly placed concrete footings in freezing weather?
Use fabric-type forms
What is a recommended way to reduce the quantity of wall and footing concrete on sloped sites?
Use a stepped foundation
Test your knowledge on concrete strength requirements for various construction elements such as footings, foundation walls, basement floors, and garage slabs. Learn about the minimum strength requirements for different applications and enhance your understanding of concrete specifications.
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