Assessing aggregate strength
Pour distilled water into small dishes
or a paint pallet on a flat
stable surface.
1
3
Place the aggregates carefully into the
water and leave for 10 minutes.
Observe how much slaking and
dispersion has occurred at the
10 minute point. Use the photos below to
help assess strength and stability.
4
Get three soil aggregates from the soil
sample. They need to be around
3-5mm in size. Air dry for 24 hours first
if possible.
2
Scoring the aggregate strength
The Aggregate Strength Score has two parts – for slaking and dispersion. Score results using the table
below:
Slaking results More than 70%
slaked 20 to 70% slaked Slight slaking
around edges No slaking
Dispersion results Strong dispersion.
Completely cloudy Moderate
dispersion Partly cloudy
around aggregate No dispersion
Scoring guide Poor Moderate Good Very good
Score 0 1 2 3
RASH MANUAL - 17