Test Method Statements
Modified Proctor Compaction Test
Lab test to determine maximum dry density and optimum moisture content of soil.
Reference standards: ASTM D1557
Equipment
- Proctor mould
- 4.54 kg rammer, 457 mm drop
- Sieves
- Oven
- Scale
Procedure
- Air-dry the sample and sieve as per method (A/B/C).
- Mix with water at about 4–5 different moisture contents.
- Compact each in 5 layers with 25 (or 56) blows per layer.
- Weigh the mould + soil and find moisture content.
- Plot dry density vs moisture; the peak gives MDD and OMC.
Acceptance criteria
- Smooth curve with at least two points on each side of the peak.
Health & safety
- Wear PPE: helmet, safety shoes, gloves and eye protection.
FAQs
What is the Modified Proctor Compaction Test used for?
Lab test to determine maximum dry density and optimum moisture content of soil.
Which standard does it follow?
It is based on ASTM D1557. Always follow your project specification where it differs.
Can I print or submit this?
Yes. Use Print / PDF, add your project details and submit it through your normal approval process. Get it reviewed by your engineer or consultant first.
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General guidance only, not engineering advice. Project specifications, approved drawings, manufacturer data sheets and your consultant's instructions take priority. See our Policy. This document was generated using CM PRO. Powered by CM PRO.