Practice Trial Mix And Adjustments (12) - Objectives of Mix Design - Civil Engineering Materials, Testing & Evaluation

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9 questions

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6 sample questions

Question 1.
What does a trial mix involve?
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Consider the key ingredients used.
Question 2.
Why is the slump test important?
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Think about what properties workability affects.
3Question 3.
What is the purpose of a trial mix in concrete design?
- To randomize concrete composition
- To assess concrete properties
- To minimize costs
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Consider the implications of testing.
4Question 4.
True or False: A high slump indicates low workability.
- True
- False
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Think about what a high slump means in practical terms.
Question 5.
A trial mix results in a slump of 20 mm when the target is 75 mm. Discuss the steps you would take to address this.
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Refer back to how workability is influenced in the mixing process.
Question 6.
You find that the compressive strength of a concrete sample at 28 days is only 22 MPa, while your target is 30 MPa. How would you adjust your mix design?
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Think about how strengths can be increased through mix composition.

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