17.5.7 - Step 7: Trial Mixes and Adjustments
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Practice Questions
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What is a trial mix?
💡 Hint: Think about why we prepare a batch before the final mix.
Why is flexural strength important?
💡 Hint: Consider what happens when concrete is loaded.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What is the first action to take after conducting trial mix tests?
💡 Hint: Think about which step ensures we can replicate success.
True or False: Only flexural strength is important in trial mixes.
💡 Hint: Recall the tests we conduct on trial mixes.
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Challenge Problems
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A trial mix resulted in a flexural strength of only 3 MPa when the target was 4.5 MPa. Outline the steps you would take to adjust the mix to achieve the desired strength.
💡 Hint: Look at each element of the mix and think about how changing each could impact strength.
You have recorded that a batch has too much workability but passes flexural strength tests. How would you adjust the mix to find a balance?
💡 Hint: Identify components that enhance workability and consider their impacts when adjusting.
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