👉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

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👉Water–cement ratio

🫵The ratio is given as 0.62, which defines the proportion of water to cement by weight.

This directly affects concrete strength and durability.

- Water quantity:
For 1 cubic meter of normal-weight concrete, the water content is specified as 180 kg.

- Cement calculation:
Based on the ratio, the cement required is 290.32 kg per cubic meter.

- Weight of water:
The water mass converts to a load of 1.77 kN.

- Weight of cement:
The cement mass converts to a load of 2.85 kN.

- Combined weight:
Adding both gives a total combined load of 4.61 kN.

📌 Key Takeaways
- Cement required: 290.32 kg/m³
- Water required: 180 kg/m³
- Combined weight of cement and water: 4.61 kN

This is a fundamental calculation in civil site engineering, ensuring proper mix proportions for strength, durability, and workability.

#ConcreteMixDesign #StructuralEngineering #ConstructionKnowledge #EngineeringInfographic #SiteWork #ConcreteTechnology

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