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Construction Aggregates Quiz

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Questions and Answers

Why are aggregates with soft particles, chert, clay lumps, and other friable particles not recommended?

They improve the durability of concrete.

They result in a soft material. (correct)

They enhance the freeze-thaw resistance of concrete.

They increase the strength of concrete.

What is the primary cause of erratic setting times and rates of hardening in aggregates?

Excessive heating during processing

Organic impurities in sand (correct)

Soft particles

High levels of moisture content

Why should aggregates susceptible to volume change due to moisture be avoided?

To improve the freeze-thaw resistance of concrete.

To lower the unit weight of the aggregates.

To enhance the durability of the construction material.

To prevent expansion and contraction issues. (correct)

Which type of construction stone would be considered lightweight based on the provided information?

Pumice Signup and view all the answers

What impact does the presence of coal or lignite in aggregates have on concrete?

Reduces volume stability Signup and view all the answers

In terms of aggregate's pore structure, why is resistance to freezing and thawing important for concrete quality?

To prevent cracking due to water expansion. Signup and view all the answers

What is the primary influence of aggregates with high absorption on concrete quality?

Volume instability Signup and view all the answers

How do heavyweight aggregates differ from lightweight aggregates in terms of unit weight?

Heavyweight aggregates have higher unit weight than lightweight aggregates. Signup and view all the answers

Why is it crucial to avoid aggregates susceptible to cyclic expansion and contraction?

To prevent cracking and durability issues. Signup and view all the answers

What characteristic of aggregates makes them susceptible to pop-outs and reduced durability?

Soft particles and friable impurities Signup and view all the answers