The Manually Operated Sand Equivalent Shaker is more operator-dependent than mechanical models, but conforms exactly to ASTM, AASHTO and California test methods. Unit has cylinder mounting bracket s uspended by two steel straps. Operator manually oscillates cylinder via steel straps to a preset mark on the case at proper rate. Digital counter records stroke counts. Components are mounted in a vinyl-covered, plywood case with reinforced corners, removable front and a top handle. Dimensions: 24x6x25in (610x152x635mm), WxDxH.
The Sand Equivalent Test indicates the relative portion of undesirable clay-like fines and dusts that occur in granular soils and fine aggregates passing the No.4 sieve. The Sand Equivalent Shaker is also used in the Durability Index Test which measures the relative resistance of an aggregate to producing such undesirable clay-like fines when subjected to degradation. In either application, the sample to be tested is placed in special solution of calcium chloride, formaldehyde, and glycerine. After shaking the cylinder with a Sand Equivalent Shaker, it is allowed to stand for a 20 minute sedimentation period. Readings are taken on the cylinder scale for the level of the top of the clay suspension, and for the sand level. The Sand Equivalent is the sand reading divided by the clay reading x 100.
Meets Test Methods:
ASTM D 2419