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CE 221-Construction Materials and Testing: Aggregates and Size Variation

10 Questions

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CE 221-Construction Materials and Testing: Aggregates and Size Variation

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Questions and Answers

What is the recommended proportion of cement, sand, and coarse aggregates in the method described?

1n:2n (correct)

1:1:2

1:3:6

1:1:3

Why is very coarse sand or very fine sand considered unsatisfactory for making concrete?

They lead to lower strength concrete

They are difficult to mix with cement

They require more water for fluidity (correct)

They result in harsh bleeding and segregation

What impact does the grading of fine aggregates have on the workability of concrete?

Significant impact (correct)

Slight improvement

No impact

Increased strength

Why is crushed sand becoming more popular in the concrete industry?

Natural sand is becoming scarce and expensive Signup and view all the answers

What type of sand is recommended for good workability in concrete?

Rounded and smooth textured sand Signup and view all the answers

Which mix is suitable for use in foundations?

1:3:6 Signup and view all the answers

What is the main disadvantage of using ordinary crushed sand in concrete production?

Harsh concrete due to rough texture Signup and view all the answers

Why is the grading of natural fine sand not always ideal?

Depends on location Signup and view all the answers

What characterizes natural fine sand that makes it preferable for concrete work?

Cubical or rounded with smooth surface texture Signup and view all the answers

Which type of mix is recommended for use in columns and beams?

1:1:2 M250 Signup and view all the answers