Practice Fineness Modulus (fm) (3.3.3) - Aggregates for Concrete

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6 sample questions

Question 1.
What is the Fineness Modulus?
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Think about how it relates to the size of aggregates.
Question 2.
Calculate FM if 40% is retained on the first sieve and 25% on the second.
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Add the percentages before dividing.
3Question 3.
What is the formula for calculating Fineness Modulus?
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Think about how percentage relates to total volume.
4Question 4.
True or False: A higher FM indicates a finer aggregate.
- True
- False
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Reflect on what FM represents.
Question 5.
You perform a sieve analysis, finding that 30%, 20%, and 25% of aggregate are retained on different sieves. How would you calculate FM and what could be the implication of that FM for concrete workability?
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Sum all retained percentages carefully.
Question 6.
If the requirements for a high-strength concrete mix set the FM limit at 2.5, but your selection yields an FM of 3.2. What adjustments could you consider?
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Focus on sourcing aggregates with finer qualities.

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