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Significance and Use
5.1 Light penetration may be used to control the quality of many TRMs. Light penetration is not indicative of field performance and therefore is not recommended for specifications.
5.2 The light penetration of TRMs may vary considerably depending on the composite materials used in the matrix of the mat or due to inconsistency within a given mat. To minimize variation, specific sample size and procedures are indicated in this test method to help ensure comparable results.
5.3 This test method may be used to determine the effect of different composite materials and make-up of TRMs.
5.4 This test method may be used for acceptance testing of commercial shipments of TRMs, but caution is advised since information on between laboratory precision is incomplete. Comparative tests as directed in 5.4.1 may be advisable.
5.4.1 In case of a dispute arising from differences in reported test results when using this test method for acceptance testing of commercial shipments, the purchaser and the supplier should conduct comparative tests to determine if there is a statistical bias between their laboratories. Competent statistical assistance is recommended for the investigation of bias. As a minimum, the two parties should take a group of test specimens that are as homogeneous as possible and that are formed from a lot of material of the type in question. The test specimens should be randomly assigned in equal numbers to each laboratory for testing. The average results from the two laboratories should be compared using Student's t-test for unpaired date and an acceptable probability level chosen by the two begun. If bias is found, either its cause must be corrected, or the purchaser and supplier must agree to the light of the known bias.
1.1 This test method covers measuring the amount of light that penetrates through a Turf Reinforcement Mat.
1.2 This test method does not provide light penetration values for TRM under variable normal sun and soil conditions. This test method determines nominal light penetration.
1.3 The values stated as a percentage are to be regarded as the standard. The values provided in foot-candles are for information only.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D123 Terminology Relating to Textiles
D1776 Practice for Conditioning and Testing Textiles
D4354 Practice for Sampling of Geosynthetics and Rolled Erosion Control Products(RECPs) for Testing
D4439 Terminology for Geosynthetics
E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
ICS Number Code 65.020.20 (Plant growing)
UNSPSC Code 30121900(Soil stabilizers and reinforcing materials)
ASTM D6567-14, Standard Test Method for Measuring the Light Penetration of a Turf Reinforcement Mat (TRM), ASTM International, West Conshohocken, PA, 2014, www.astm.orgBack to Top