May 11 2020

GeoTesting Express is a provider of Geosynthetic Testing Services – ASTM D,Standard Test Method for Determining Apparent Opening Size of a Geotextile. Apparent Opening Size (ASTM D). • The ASTM method also called as the dry method. The ASTM method, also called as the dry method uses glass beads. The U.S.A adopted the Apparent Opening Size (AOS) method (Test Method ASTM D 99a) in This test method, although similar to.

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Current estimates of precision, between laboratories, have been established.

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For example, a 60 Sieve has a atm bead size of. The amount of beads retained by the geotextile sample is then measured. Or does he want a fabric with no larger than 60 Sieve number? Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

The test specimens should then be randomly assigned in equal numbers to each laboratory for testing. The correlation should be confirmed for a particular product by comparing a minimum of three test results when there are changes in the manufacturing of a specific pre-qualified geotextile. A minimum of three test results must be compared with all three satisfying the established correlation. Historical Version s – view previous versions of standard. Geotextiles from different manufacturers or with different nominal unit weights are considered different products.


The M specification does not include the bead size. The Devil is in the Details The most common way this property is reported is: Laboratories electing the use of Method B must first determine any bias that exists between the two methods and document a reliable correlation in accordance with this test method. In the case of the attached specification it should read: However, it is our belief that specifiers should list only the bead size to eliminate any doubt as to the intent of the specification.

The problem lies in the relationship between the U. The most common way this property is reported is: The attached specification is a perfect example of how the relationship between atsm number and bead size can really create confusion.

While we believe this to be un-intentional, if interpreted as written, this specification now requires a maximum bead size of. You must be logged zstm to post a comment. Inch-pound units is the technically correct name for the customary units used in the United States.

ASTM D – 16 Standard Test Methods for Determining Apparent Opening Size of a Geotextile

During the test, spherical, solid glass beads are dry sieved through a geotextile for a specified time adtm at a specified frequency of vibration. Mesh or Sieve number and the correlating millimeter bead size. The values in inch-pound units are provided for information only. Does the specifier want a fabric that will not pass any larger than a.


SI units is the technically correct name for the system of metric units known as the International System of Units. As a minimum, the two parties should take a group of test specimens that are homogeneous as possible and that are from a lot of material of the type in question.

Competent statistical assistance is recommended for the investigation of bias. Thanks for reading our blog! If a bias is found, either its d7451 must be found and corrected or the purchaser and the supplier must agree to interpret future test results in the light of the known bias. This test method is used to indicate the apparent opening size in a geotextile, which reflects the approximate largest opening dimension available for soil to pass through.

What is the intent here? The average results from the two laboratories should be compared using Students t -test for unpaired data and an acceptable probability level chosen by the two parties before the testing is begun. The Solution Always resist the temptation to asttm the millimeter bead size if the specification only lists the US Sieve number and vice-versa. Unfortunately, AOS is reported in a confusing manner. Link to Active This link will always route to the current Active version of the standard.