1.1 本试验方法包括通过暴露于氙弧辐射、水分和热量来测定土工织物抗拉强度的劣化。 1.2 光和水曝光装置采用氙弧光源。 1.3 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可能不是精确的等效值；因此，每个系统应相互独立使用。将两个系统的值合并可能会导致不符合标准。 1.4 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。 1.5 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 该方法旨在引起与最终使用条件相关的性能变化，包括太阳辐射、水分和热量的影响。所使用的暴露不是为了模拟局部天气现象引起的恶化，例如大气污染、生物攻击和盐水暴露。 5.2 根据本试验方法进行的暴露中的失效时间与特定室外环境中的使用寿命之间的关系需要确定加速因子，如术语中所定义 G113页 . 加速因子取决于材料，仅当其基于足够数量的单独外部和实验室加速暴露的数据时才有效，以便可以使用统计方法分析用于将每次暴露中的故障时间关联起来的结果。 注1: J。 A、 西姆斯。 4. 参见练习 G151页 有关使用加速因子的更多信息和其他注意事项。 5.2.1 从本试验方法的结果中获得的劣化曲线使用户能够确定土工织物在暴露于氙弧辐射、水和热时的劣化趋势。 5.3 当操作条件在本试验方法的可接受范围内变化时，结果可能会发生变化。其预期用途是定性评估紫外线抑制剂的存在，并比较产品之间的影响。然而，试验结果不应暗示稳定时间与持续时间和室外暴露之间的关系。 注2: 指南中提供了关于可变性来源以及解决实验室加速暴露试验设计、执行和数据分析中可变性的策略的信息 G141页 . 5.3.1 如果买方和卖方有必要使用本试验方法进行验收试验，则应确定买方和卖方实验室之间的统计偏差（如有）。这种比较是基于从正在评估的土工布样品中随机抽取的样本。 5.3.2 在这种情况下，双方至少应采取一组尽可能同质的试样，这些试样来自于所讨论类型的大量材料。然后，应将试样以相同数量随机分配给每个实验室进行测试。两个实验室的平均结果应使用学生的 t -测试未配对数据和双方在测试开始前选择的可接受概率水平。如果发现偏差，必须找到并纠正其原因，或者买方和供应商必须同意根据已知偏差解释未来的测试结果。

1.1 This test method covers the determination of the deterioration in tensile strength of geotextiles by exposure to xenon arc radiation, moisture, and heat. 1.2 The light and water exposure apparatus employs a xenon arc light source. 1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard. 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 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 This method is intended to induce property changes associated with end-use conditions, including the effects of solar radiation, moisture, and heat. The exposure used is not intended to simulate the deterioration caused by localized weather phenomena such as atmospheric pollution, biological attack, and saltwater exposure. 5.2 The relation between time to failure in an exposure conducted in accordance with this test method and service life in a specific outdoor environment requires determination of an acceleration factor, as defined in Terminology G113 . The acceleration factor is material dependent and is only valid if it is based on data from a sufficient number of separate exterior and laboratory-accelerated exposures so that the results used to relate times to failure in each exposure can be analyzed using statistical methods. Note 1: An example of a statistical analysis using multiple laboratory and exterior exposures to calculate an acceleration factor is described by J. A. Simms. 4 See Practice G151 for more information and additional cautions about the use of acceleration factors. 5.2.1 The deterioration curve obtained from the results of this test method enables the user to determine the tendency of a geotextile to deteriorate when exposed to xenon arc radiation, water, and heat. 5.3 Variation in results may be expected when operating conditions are varied within the accepted limits of this test method. Its intended use is as a qualitative assessment of the presence of ultraviolet inhibitors, and comparison of that influence between products. However, no inference to the time of stability should be implied by the test results to the relation between time duration and outdoor exposure. Note 2: Information on sources of variability and on strategies for addressing variability in the design, execution, and data analysis of laboratory-accelerated exposure tests is found in Guide G141 . 5.3.1 If it becomes necessary for the purchaser and seller to use this test method for acceptance testing, the statistical bias, if any, between the purchaser's and seller's laboratories should be determined. Such comparison is based on specimens randomly drawn from the sample of geotextile being evaluated. 5.3.2 In such cases, at a minimum, the two parties should take a group of test specimens which are as homogeneous as possible, and which are from a lot of material of the type in question. The test specimens should then 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 data and an acceptable probability level chosen by the two parties before the testing started. If a bias is found, either its cause 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.