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Concrete Properties and Characteristics

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Questions and Answers

What is the primary characteristic of a fresh concrete mix in terms of placeability?

Density

Strength

Consistency and workability (correct)

Durability

What is the ratio of cement, sand, and coarse aggregate for very high strength concrete mixes?

1:3:6

1:1.2:2.4 (correct)

1:2:4

1:1.5:3

Which method of testing is used in the American Standard?

Cube Testing

Tensile Testing

Cylinder Testing (correct)

Compression Testing

What is the advantage of machine mixing over hand mixing?

Less cement required Signup and view all the answers

What is the recommended minimum mixing time for concrete?

1 minute Signup and view all the answers

What percentage of the mixing water should be placed in the drum before adding dry materials?

10% Signup and view all the answers

What is the primary reason why concrete requires tension reinforcement?

Due to its low tensile strength Signup and view all the answers

What is the term used to describe the ability of freshly mixed concrete to flow?

Consistency Signup and view all the answers

Why is concrete considered a heavy material?

Due to the density of its aggregate components Signup and view all the answers

What is the purpose of using forms, falsework, and shoring during concrete construction?

To support the concrete during its initial curing process Signup and view all the answers

What is a common issue that can affect the quality of concrete?

Variations in proportions, mixing, placing, and curing Signup and view all the answers

What is the primary economic advantage of using concrete in construction?

It is an inexpensive material, often using local resources Signup and view all the answers