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Concrete Strength Requirements

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Questions and Answers

What is the minimum strength required for basement floors?

15 MPa

25 MPa

20 MPa (correct)

32 MPa

Why is air entrainment required for exterior concrete applications?

To make the concrete more expensive

To increase the concrete's strength

To change the color of the concrete

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

What is the purpose of using cement types 20, 40, 50 or equivalent in certain areas?

To increase the strength of the concrete

To reduce the cost of the concrete

To change the color of the concrete

To protect the concrete from sulphate attack (correct)

Why should additional water not be added to the concrete at the construction site?

It will increase the permeability and decrease freeze-thaw resistance (D) Signup and view all the answers

What should be avoided in the aggregates used in concrete manufacturing?

Sulphides such as pyrite, pyrrhotite and marcasite (C) Signup and view all the answers

What is the range of air entrainment required for exterior concrete applications?

5 to 8 per cent (B) Signup and view all the answers

What is the purpose of adding a plasticizer or other concrete admixture to the mix?

To improve workability and placement (D) Signup and view all the answers

What is the primary purpose of performing a slump test on site-batched concrete?

To gauge the consistency and workability of the concrete (A) Signup and view all the answers

What is the advantage of using ready-mix concrete?

It can be tailored to meet specific strength, durability, and workability requirements (B) Signup and view all the answers

Why is it important to use clean and well-graded aggregates in concrete mixing?

To prevent damage to the concrete and ensure its strength and durability (A) Signup and view all the answers

What is the recommended water-cement ratio for site-mixed concrete for garage and carport floors?

0.45 (B) Signup and view all the answers

What is the importance of following the manufacturer's instructions when using premixed bags of cement and aggregate?

To obtain the desired strength and durability of the concrete (A) Signup and view all the answers