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Concrete Workability and Strength Quiz

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Questions and Answers

Which of the following factors directly affects the workability of concrete?

Ambient temperature

Admixture type

Water content (correct)

Curing time

What is the purpose of the slump test?

To detect variations in the uniformity of a given concrete mix (correct)

To measure the density of fully compacted concrete

To determine the depth of penetration of a weighted ball

To measure the diameter of the spread after vibration

What is the significance of a 'zero slump' result in the slump test?

It indicates a stiff mix (correct)

It indicates a segregated mix

It indicates a rich mix

It indicates a lean mix

Which test measures the depth of penetration of a weighted ball?

Kelly ball test Signup and view all the answers

What is the purpose of the compacting factor test?

To measure the density ratio of actual density to fully compacted density Signup and view all the answers

What is the primary reason for segregation in wet concrete mixes?

Different particle sizes settle at different rates Signup and view all the answers

What is laitance?

A weak, friable layer formed on the concrete surface after curing Signup and view all the answers

What is the purpose of curing concrete?

To create an environment for the concrete to harden properly Signup and view all the answers

What is the primary characteristic of pumped concrete?

It has a relatively high slump (6-8 inches) Signup and view all the answers

What is the primary requirement for mixing water in concrete?

It must be fit for drinking Signup and view all the answers