Ethio Construction Engineering
👉What is FM in Sieve Analysis? 🤔

💫FM = Fineness Modulus – it’s an index number representing the average particle size of aggregate.

🚧It’s calculated by adding the cumulative % retained on standard sieves and dividing by 100.

🔍 Effect of FM on Concrete:

⏺Higher FM → Coarser aggregate → Less water demand, but may reduce workability.

⏺Lower FM → Finer aggregate → Higher water demand, better workability but more shrinkage.

✅ Ideal FM Range for Sand: 2.3 – 3.1 (for good concrete mix)

⚠ Too high or too low FM can affect strength, durability, and finishing of concrete.

#CivilEngineering #SieveAnalysis #FinenessModulus #ConcreteMixDesign

@etconp

1 comment

Sintayehu Tizazu
Thank you for sharing your knowledge.