Practice Compressive Strength Requirements - 1.1 | 20. Acceptability Criteria in Concrete Mix Design | Civil Engineering Materials, Testing & Evaluation - Vol 2
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Knowledge

1.1 - Compressive Strength Requirements

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Learning

Practice Questions

Test your understanding with targeted questions related to the topic.

Question 1

Easy

What does target mean strength (f'ck) represent?

💡 Hint: Think about the average desired strength considering variations.

Question 2

Easy

Define characteristic strength (fck).

💡 Hint: Consider it the acceptable minimum strength.

Practice 4 more questions and get performance evaluation

Interactive Quizzes

Engage in quick quizzes to reinforce what you've learned and check your comprehension.

Question 1

What is the significance of the tolerance factor in concrete mix design?

  • It guarantees 100% strength
  • It accounts for material variability
  • It reduces costs

💡 Hint: Think about variability in materials.

Question 2

True or False: Characteristic strength is defined as the strength below which no more than 5% of test results are expected to fall.

  • True
  • False

💡 Hint: Focus on the definition of characteristic strength.

Solve 1 more question and get performance evaluation

Challenge Problems

Push your limits with challenges.

Question 1

A concrete mix has a characteristic strength (fck) of 30 MPa and a standard deviation (s) of 4 MPa. Calculate the target mean strength (f'ck) using a tolerance factor (t) of 1.65. What do these values imply for the safety of the mix?

💡 Hint: Remember to use the formula to find the unknown strengths.

Question 2

If a concrete sample fails to meet the characteristic strength of 25 MPa, what steps should be taken to ensure structural safety?

💡 Hint: Think about what went wrong in the mixing process.

Challenge and get performance evaluation