Proctor compaction test by European standards

The modified proctor compaction test procedure in accordance with CEN EN 13286-2 (2012) slightly differs from the one described in ASTM D 1557 (2012) or AASHTO T 180 (2010). 

The key differences include the maximum size of the particles of the soil to be tested, the sizes of the moulds and the mass and diameter of the rammer and its dropping height, in case a large-sized mould (250 mm) is used. 

The recommended particle sizes, the percentage passing and the type of mould to be used 

The standard mould size is the one with 150 mm diameter. However, any mould can be used provided its diameter is four times the maximum size (D) of the particles in the soil sample. Finally, when the percentage of particles retained in the 63 mm sieve is greater than 25%, the test is inappropriate. 

The number of specimens required is at least five or at least three when the material is 

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