1.1 本测试程序主要基于GRI GG7测试程序，即聚对苯二甲酸乙二醇酯（PET）纱线的羧基端基含量。 1.2 本试验方法用于通过滴定法测定聚对苯二甲酸乙二醇酯（PET）纱线中羧基端基（CEG）的浓度，单位为mmol/kg。 1.3 本试验适用于由PET树脂制成的土工格栅纱线。 注1: 本试验也适用于由PET制成的用于加固应用的高强度土工织物纱线。 1.4 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 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 本试验方法可用于制造质量控制或制造质量保证，以确定土工格栅或土工织物中使用的PET纱线的CEG浓度。 5.2 PET纱线的CEG含量可能会影响土工合成材料的性能，例如其耐水解性。值越低，纱线的抗水解性越高。 5.3 本测试未设置各种工程应用的极限（最大）值。 此类规范由设计工程师、业主和/或监管机构决定。

1.1 This test procedure is based significantly on the GRI GG7 test procedure, Carboxyl End Group Content of Polyethylene Terephthalate (PET) Yarns. 1.2 This test method is used to determine the concentration, in mmol/kg, of carboxyl end groups (CEG) found in poly(ethylene terephthalate) (PET) yarns by titration. 1.3 This test is applicable to geogrid yarns that are made from PET resin. Note 1: This test is also applicable to high-strength geotextile yarns that are made from PET and are used in reinforcement applications. 1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 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 This test method can be used for manufacturing quality control or manufacturing quality assurance purposes to determine the CEG concentration of PET yarns used in either geogrids or geotextiles. 5.2 The CEG content of the PET yarns may have an influence on the properties of the geosynthetic, such as its hydrolysis resistance. The lower the value, the higher the hydrolysis resistance of the yarns. 5.3 This test does not set the limiting (maximum) value for various engineering applications. Such a specification is a decision of the design engineer, owner, and/or regulator.