Practice Target Mean Strength - 4 | 19. Objectives of Mix Design | Civil Engineering Materials, Testing & Evaluation - Vol 2
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Knowledge

4 - Target Mean Strength

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Learning

Practice Questions

Test your understanding with targeted questions related to the topic.

Question 1

Easy

What is the formula for Target Mean Strength?

💡 Hint: Remember to include the risk factor and standard deviation.

Question 2

Easy

What does a risk factor of 1.65 indicate?

💡 Hint: Think about what percentage of results the characteristic strength relates to.

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 does the risk factor k generally represent in calculations?

  • 1.65 for 5% risk
  • 2.0 for 10% risk
  • 3.14 for 15% risk

💡 Hint: Consider what percentage of results fall below characteristic strength.

Question 2

True or false: The higher the standard deviation, the lower the target mean strength required.

  • True
  • False

💡 Hint: Think about how variability influences strength calculations.

Solve 1 more question and get performance evaluation

Challenge Problems

Push your limits with challenges.

Question 1

You are tasked with designing a structure in a high-stress environment. The concrete has a characteristic strength of 35 N/mm² and a standard deviation of 5. What should your target mean strength account for?

💡 Hint: Revisit the formula to ensure all variables are used correctly.

Question 2

During a quality check, you discover inconsistent material properties resulting in a higher standard deviation than originally anticipated. How would you adjust your planned target mean strength?

💡 Hint: Consider how the standard deviation impacts your mean strength prediction.

Challenge and get performance evaluation