Site investigation · Laboratory: compaction & field density

CBR soaked swell & moulding conditions calculator

Swell during soaking, moulding density ratio and moisture ratio for a CBR specimen.

Standard: AS 1289.6.1.1 (swell) · ASTM D1883

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Inputs in the worked example

The live calculator starts with these values; change any of them and every result, check and diagram updates instantly.

InputValueUnit
Initial specimen height116.4mm
Dial at start of soak2.05mm
Dial at end of soak3.37mm
Moulded dry density1.79t/m³
MDD1.85t/m³
Moulding moisture14.8%
OMC15.2%
Max swell allowed1.5%

Worked example — results

ResultValueUnit
Swell1.13%
Density ratio96.76%
Moisture ratio97.37%
soaked 4 daysH0 116.4 mmdial 2.05 → 3.37 mmSwell1.13 %max 1.5 %00.5limit 1.0Swell ≤ limit0.76 PASS
Diagram for the worked example

Method, formulas and assumptions

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For preliminary design and education. Check every result against the current standard and your own engineering judgement before use.