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Concrete Strength Requirements Quiz

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Questions and Answers

Which type of concrete must have a minimum strength of 15 MPa (2,200 psi)?

Non-reinforced concrete

Both non-reinforced and reinforced concrete (correct)

Reinforced concrete

Concrete for columns, fireplaces, chimneys and foundation walls

What is the minimum strength required for basement floors?

5-8% air entrainment

32 MPa (4,600 psi)

15 MPa (2,200 psi)

20 MPa (3,000 psi) (correct)

Why is air entrainment required for exterior applications?

To make concrete more workable and easier to place

To reduce degradation caused by de-icing salts and exposure to freezing temperatures (correct)

To protect the concrete in areas where soils are sulphate reactive

To prevent volume increases and cracking in the concrete

Which test is used to gauge the consistency and workability of concrete?

Slump test Signup and view all the answers

What is ready-mix concrete?

Concrete manufactured in plants Signup and view all the answers

What should the water and aggregate used for on-site mixing be free of?

Organic material Signup and view all the answers

What is the recommended water to cement ratio for garage and carport floors?

0.45 Signup and view all the answers

Which temperature range requires concrete to cure for an additional three days?

Between 10°C (50°F) and 21°C (70°F) Signup and view all the answers

What can be used to maintain moist conditions for curing when water curing is not practical?

Spray-on curing compounds Signup and view all the answers

What should be done to protect freshly placed concrete footings in freezing weather?

Use fabric-type forms Signup and view all the answers

What is a recommended way to reduce the quantity of wall and footing concrete on sloped sites?

Use a stepped foundation Signup and view all the answers