1.1 本试验方法包括评估户外暴露后抗拉强度和应变的劣化。 1.2 劣化被评估为未暴露的土工布在破坏时的强度和应变降低。 1.3 光照和天气暴露的具体位置是根据有关各方之间的现场具体决定确定的。 1.4 以国际单位制或英寸-磅单位表示的数值应单独视为标准值。每个系统中规定的值不一定是精确的等价物；因此，为确保符合本标准，每个系统应独立使用，且两个系统的值不得组合。 1.5 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 一个位置的室外暴露试验可能不适用于另一个位置的项目现场。本试验方法评估了18个月内现场特定大气条件下的土工布。退化曲线符合 10.8 根据强度、伸长率或模量或所有这些，可以为正在评估的土工布开发。 5.2 该试验方法可用于土工织物降解的对比试验。 5.3 本试验方法被视为性能试验，因此，其性能由指定机构或采购机构负责。 注1: 本程序的目的是为本试验方法和土工织物的用户提供一个标准，根据该标准评估现场特定条件下的风化降解，而不是入射辐射和温度。如果需要，用户可能希望在每个现场配备必要的测量和记录设备。然而，在每个地点这样做的费用可能会过高。因此，这不是本试验方法的具体要求。

1.1 This test method covers evaluating the deterioration in tensile strength and strain after outdoor exposure. 1.2 The deterioration is assessed as a reduction in strength and strain at failure from the unexposed geotextile. 1.3 The specific location of the light and weather exposure is made on the basis of a site-specific decision between the parties involved. 1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined. 1.5 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 Outdoor exposure tests at one location may not be applicable to a project site at another location. This test method evaluates geotextiles under site-specific atmospheric conditions over an 18-month period. A degradation curve as per 10.8 , based on strength, elongation, or modulus, or all of these, may be developed for the geotextile being evaluated. 5.2 This test method can be used for comparative testing of the degradation of geotextiles. 5.3 This test method is considered to be a performance test and as such the responsibility for its performance rests with the specifying or purchasing agency. Note 1: The intent of this procedure is to provide the user of this test method and geotextiles a standard by which to evaluate weathering degradation in terms of site-specific conditions, not in terms of incident radiation and temperature. If desired, the user may want to have the necessary measurement and recording equipment at each site to do this. However, the expense of doing so at each site may be prohibitive. Therefore, this is not a specific requirement of this test method.