Quality Inspector
Earthwork & Excavation
Soil Compaction & Swell Calculator (2026) – QC Master
Expert Guide
Smart tool for monitoring physical soil properties and compaction quality control (QC).
⚡ Quick Answer
Compaction Degree = (Field Dry Density ÷ Max Dry Density) × 100%. **Pass if ≥ 95% MDD** (standard IS/BS specification). Example: Field Density 1,800 kg/m³ with MDD 1,950 kg/m³ → 92.3% — **FAIL**, requires re-rolling. For structured QC reports, visit pro.nirmansutra.com.
🛠️ How It Works
- •Select the soil type — each has different swell and shrinkage factors for volume estimates.
- •Enter the original Bank Volume (in-ground) to compute loose and compacted fill volumes.
- •Enter the Field Dry Density from your density test (sand replacement or core cutter method).
- •Enter the Max Dry Density (MDD) from the Proctor compaction test done in the lab.
- •The tool calculates Compaction % and gives a PASS/FAIL verdict against the 95% MDD standard.
📐 Calculation Formula
Compaction Degree = (Field Dry Density ÷ MDD) × 100 %
Pass Threshold = ≥ 95% MDD (standard specification)
Loose Volume = Bank Volume × Swell Factor
Compacted Volume = Bank Volume × Shrinkage Factor
📋 Real-Life Example
Example: Sandy soil, Bank Volume = 10 m³.
1. Loose Volume (transport) = 10 × 1.25 (swell) = 12.5 m³.
2. Compacted Fill Volume = 10 × 0.90 (shrinkage) = 9.0 m³.
3. Lab MDD = 1,950 kg/m³. Field Density test = 1,800 kg/m³.
4. Compaction % = (1800 ÷ 1950) × 100 = 92.3% → FAIL (below 95%).
5. Action: Add 1–2 more roller passes and retest.
⚠️ Common Mistakes to Avoid
- ✕Testing compaction immediately after rainfall — saturated soil gives false high density readings.
- ✕Applying compaction in layers thicker than 150–200 mm — deeper soil remains loose even if surface reads as dense.
- ✕Using MDD from a different soil sample — always match the lab Proctor test to the actual fill material being used on site.
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मिट्टी की कॉम्पैक्शन रिपोर्ट कैसे पढ़ें?
❓ Frequently Asked Questions
It means the field dry density has reached 95% of the Maximum Dry Density achieved in a lab proctor test. This is mandatory for foundations.
Ensure the "Optimum Moisture Content" (OMC) is maintained and use a vibratory roller in 150-200mm layers.
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Worth NRs. 5,000
NRs. 999 🎯
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