3.3.3 - Fineness Modulus (FM)
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Practice Questions
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What is the Fineness Modulus?
💡 Hint: Think about how it relates to the size of aggregates.
Calculate FM if 40% is retained on the first sieve and 25% on the second.
💡 Hint: Add the percentages before dividing.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What is the formula for calculating Fineness Modulus?
💡 Hint: Think about how percentage relates to total volume.
True or False: A higher FM indicates a finer aggregate.
💡 Hint: Reflect on what FM represents.
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Challenge Problems
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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?
💡 Hint: Sum all retained percentages carefully.
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?
💡 Hint: Focus on sourcing aggregates with finer qualities.
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