Dry Sieve Test Apparatus

Dry Sieve Test Apparatus
Dry Sieve Test Apparatus
Product Description
Soil retention is a predominant function of geotextiles in drainage and filtering applications. Pore size is the key
parameter that controls the ability of the geotextile to retain the soil. The Apparent Opening Size (AOS) also called the
Equivalent Opening Size (EOS) was developed by US Army Corps of Engineers for evaluating
this property. AOS is the size of the holes in the geotextiles and it provides an index to the size of the largest opening
through the geotextile. In conducting this test, the geotextile fabric is placed (instead of a wire mesh) in a sieving frame
by using a special clamping arrangement. The test involves sieving rounded particle sizes for which 5% or less by
weight, pass through the geotextile. The AOS is defined as 'Retained On' size of that fraction expressed as a standard
sieve number(size).
The test is widely used for relative comparison amongst the geotextiles. Thus AOS is a means of correlating geotextile
pore structure to an equivalent screen mesh size. This test is standardised by ASTM, ISO, IGS (International Geotextile
Society).The apparatus consists of a 20 cm dia brass frame with clamp, a receiver and a lid.
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