Standard Test Method for Determining the Pore Size Characteristics of Geotextiles Using an Optical Method

Importancia y uso:

5.1 The significant opening size of geotextiles is usually determined using Test Method D4751, which involves sieving calibrated beads through specimens of the geotextile being evaluated. However, Test Method D4751 includes many risks of errors due to static electricity, precision of the glass beads, among other issues.5 This risk of error is even higher with knitted geotextiles which exhibit a very low tensile modulus. This test method is proposed as an alternate to Test Method D4751 using a nondestructive technique, where the stress conditions are controlled without manipulation of the specimen.

5.2 This test method has been found to provide representative results for products exhibiting a planar structure, such as two-dimensional knits.

5.3 In case of a dispute arising from differences in reported test results when using ASTM D4751 Method A and this method, ASTM D4751 Method A shall be considered the referee method. However, data obtained using ASTM D4751 Method A should be reviewed considering the high risk of human error associated with the control of the stress condition of the geotextile.

5.4 Equivalency with the other pore opening size determined using other standards (for example, ISO 12956 and CGSB 148.1 No. 10) can also be considered using adequate correlations with test results obtained with these standards.

Subcomité:

D35.03

Volúmen:

04.13

Número ICS:

59.080.70 (Geotextiles)

Palabras clave:

AOS; filter; filtration; geotextile; image analysis; image opening size; IOS; opening size; pore size distribution;