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Concrete Slump Test Precision

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Questions and Answers

What was the ratio of cementitious materials in the concrete mixture?

500 lb equally divided between cement and fly ash (correct)

300 lb of cement and 200 lb of fly ash

400 lb of cement and 100 lb of fly ash

600 lb of cement and 400 lb of fly ash

What was the purpose of adding a double dosage of chemical retarder?

To increase the slump of the concrete

To reduce the temperature of the concrete

To minimize slump losses and maintain workability (correct)

To increase the strength of the concrete

What was the average slump loss during the 20-minute test?

1.08 in.

0.48 in.

0.68 in. (correct)

0.88 in.

What was the temperature range of the concrete during testing?

86 to 93°F (30 to 34°C) Signup and view all the answers

What was the total number of slump tests performed?

270 Signup and view all the answers

Why was the precision data applicable to both metal and plastic molds?

Because both metal and plastic molds produced comparable results Signup and view all the answers

What is the definition of 'same materials' in this context?

Freshly mixed concrete from one batch Signup and view all the answers

What is the bias of this test method?

It has no bias Signup and view all the answers

What was the unit of measurement used to develop the precision statement?

Metric units (millimeters) Signup and view all the answers

What is the purpose of the retarder in the concrete mixture?

To slow down the setting process Signup and view all the answers