Compaction Curve

Standard & Modified Proctor Analysis — Plot dry density vs moisture content, determine MDD & OMC per AASHTO T 99/T 180 / ASTM D698/D1557

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Proctor Compaction Analysis

Enter lab compaction data points. Auto-fit curve, calculate Maximum Dry Density (MDD) and Optimum Moisture Content (OMC). Compare Standard vs Modified.

Point 1 - w (%)%

γd (pcf)pcf

Point 2 - w (%)%

γd (pcf)pcf

Point 3 - w (%)%

γd (pcf)pcf

Point 4 - w (%)%

γd (pcf)pcf

Point 5 - w (%)%

γd (pcf)pcf

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Enter 3-5 Data Points

Input moisture content and dry density from lab. Click Analyze Standard.

Point 1 - w (%)%

γd (pcf)pcf

Point 2 - w (%)%

γd (pcf)pcf

Point 3 - w (%)%

γd (pcf)pcf

Point 4 - w (%)%

γd (pcf)pcf

Point 5 - w (%)%

γd (pcf)pcf

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Enter Modified Data

⚖️ Standard vs Modified Comparison

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Std MDD

-- pcf

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Std OMC

-- %

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Mod MDD

-- pcf

💧

Mod OMC

-- %

📈 Standard vs Modified Curves

📊 Energy Comparison

Standard (T 99/D698): 5.5 lb hammer, 12" drop, 3 layers, 25 blows/layer = 12,375 ft-lbf/ft³
Modified (T 180/D1557): 10 lb hammer, 18" drop, 5 layers, 25 blows/layer = 56,250 ft-lbf/ft³
Ratio: Modified energy ≈ 4.5 × Standard

📈 Typical Differences

MDD (Modified) ≈ MDD (Standard) + 10-15 pcf
OMC (Modified) ≈ OMC (Standard) - 2-3%
Higher energy → denser packing at lower moisture

🛣️ Application

Standard: Light traffic, embankments, trench backfill
Modified: Heavy traffic, runways, highways, foundations
Use modified when compaction equipment delivers high energy

🏗️ Field QC — Percent Compaction

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Enter Field Data

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Compaction Curve

📋 Standard Proctor Results (AASHTO T 99 / ASTM D698)

📋 Modified Proctor Results (AASHTO T 180 / ASTM D1557)

⚖️ Standard vs Modified Comparison

🏗️ Field QC — Percent Compaction

📋 Field QC Results