- High silt content materials can usually be identified by a simple hand test:
PreparationSelect a moist sample of the fine material only.
Test – Silt identificationWith clean dry hands, rub the sample between the palms, remove the excess material by striking the palms together and wait a few minutes for body heat to dry out any material adhering to the hands. Finally, rub hands together briskly.
ResultIf no significant quantity of material remains adhering to the palms, i.e. the palms are relatively clean, then the sample tested is essentially a silt.Note: The proportion of granular material discarded to produce the fine sample must be taken into account when estimating the approximate silt content of the bulk material.