The test method described in the standard “ASTM D5261-92 Standard test method for measuring mass per unit area of geotextiles” developed by the American Society for Testing and Materials (ASTM) is generally used as an index in the determination of mass per unit area of all geotextiles.
For the purposes of this standard, the following terms and definitions apply:
The mass per unit area of a geotextile is determined by weighing test samples of known dimensions cut at various places across the full width of the laboratory sample. The calculated values are then averaged to obtain the average mass per unit area of the laboratory sample.
This test method is used to determine whether the geotextile material meets the mass per unit area specifications. This test method is used for quality control purposes to determine sample conformity. This measurement provides a simple check of the delivered material by comparing the mass per unit area of the delivered material with the specified mass per unit area.
The procedure in this test method can be used for acceptance testing of commercial shipments, but caution is advised because information on interlaboratory precision is lacking.
In the event of a dispute arising from differences in test results reported using the procedures in this test method for acceptance testing of commercial shipments, the purchaser and the manufacturer should conduct comparative tests to determine whether a statistical bias exists between their laboratories. Competent statistical assistance is recommended in investigating the bias. At a minimum, the two parties should obtain a group of test samples consisting of as many materials of the type in question as possible, which are as homogeneous as possible. The test samples should then be randomly assigned in equal numbers to each laboratory for testing. The average results of the two laboratories should be compared using an acceptable probability level selected by the two parties. If a bias is found, either the cause should be found and corrected, or the purchaser and the manufacturer should agree to interpret future test results in light of the known bias.
To test geotextiles, test samples must be brought to moisture equilibrium in the atmosphere. If the increase in the mass of the test sample does not exceed 2 percent of the mass of the test sample in successive weighings made at least 60,1 hours apart, it is accepted that equilibrium has been reached.
It is recognised that in practice geotextiles are not often weighed to determine when moisture equilibrium has been reached. While such a procedure is unacceptable in cases of dispute, in routine testing it may be sufficient to expose the material to the standard atmosphere for a reasonable period of time before testing the samples. In most cases a period of at least 24 hours has been found acceptable.
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