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Here’s a detailed breakdown of the concrete block calculation process, explained step by step in civil‑engineering style:

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🔹 Step‑by‑Step Details

1. Volume of Wall
Formula: L × B × H
Example: 6 × 0.152 × 3 = 2.736 m³

2. Volume of One Block (Without Mortar)
Formula: 0.405 × 0.152 × 0.200 = 0.012312 m³

3. Volume of One Block (With Mortar)
Formula: 0.429 × 0.152 × 0.225 = 0.014076 m³

4. Number of Blocks
Formula: Volume of Wall ÷ Volume of One Block (With Mortar)
2.736 ÷ 0.014076 = 186 Nos

5. Volume of Total Blocks
Formula: No. of Blocks × Volume of One Block (Without Mortar)
186 × 0.012312 = 2.292 m³

6. Volume of Mortar
Formula: Total Volume − Volume of Blocks
2.736 − 2.292 = 0.444 m³

7. Wet Volume
Formula: Volume × 1.27
2.736 × 1.27 = 3.477 m³

8. Dry Volume
Formula: Mortar Volume × 1.27
0.444 × 1.27 = 0.564 m³

9. Cement & Sand Requirement
- Cement (1 part): 0.564 ÷ (1+6) = 0.094 m³ ≈ 2.31 bags
- Sand (6 parts): 0.564 × 6 ÷ 7 = 0.385 m³ ≈ 3.39 m³
- Synthetic Sand (approx.): 0.45 × 3.39 ≈ 1.53 m³

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📌 Key Notes
- Mortar joint thickness (≈12 mm) is critical in block volume calculation.
- Conversion factor 1.27 accounts for bulking of sand and wastage.
- Always check block dimensions before applying formulas.
- Synthetic sand is often used as a partial replacement in masonry works.

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✅ Final Results
- Wall Volume: 2.736 m³
- Blocks Required: 186 Nos
- Mortar Volume: 0.444 m³
- Cement: 2.31 Bags
- Sand: 3.39 m³
- Synthetic Sand: 1.53 m³

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