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Concrete Sample Preparation and Testing

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Questions and Answers

What is the temperature range for testing specimens in air?

95°F to 105°F (35°C to 40°C)

65°F to 85°F (18°C to 30°C)

85°F to 95°F (30°C to 35°C)

75°F ± 15°F (24°C ± 8°C) (correct)

What is the minimum humidity level for testing specimens in air?

Less than 60 %

Less than 80 % (correct)

Less than 70 %

Less than 90 %

What is the minimum duration for testing specimens in air?

36 hours

48 hours (correct)

60 hours

24 hours

What is the standard practice for capping concrete masonry units?

ASTM C1552 Signup and view all the answers

What is the purpose of determining the location of the mass centroidal axes?

To align the specimen with the center of thrust of the machine Signup and view all the answers

What should be wiped clean before testing?

The bearing faces of the platens and the bearing plates Signup and view all the answers

What is the minimum time required to apply the remaining load after the initial load?

1 minute Signup and view all the answers

What is the unit of measurement for the maximum compressive load?

Pounds (lbf) Signup and view all the answers

What is the purpose of aligning the mass centroidal axes with the center of thrust of the machine?

To apply the load uniformly Signup and view all the answers

What is the maximum allowable moisture level for testing specimens?

No visible moisture Signup and view all the answers