1.1 该试验方法提供了一种加速玻璃纤维增强水泥基复合材料老化的方法，以开发能够表明真实自然风化性能的数据。 1.2 为该试验方法制备的试样将使用试验方法进行试验 第947页 。 1.3 此测试方法可用于老化其他测试方法的试样。 1.4 以英寸磅为单位的数值应视为标准。括号中给出的值是国际单位制的数学转换，仅供参考，不被视为标准。 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）。本标准的使用者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》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 3.1 作为纤维增强复合材料长期性能指标的该试验的基础是，升高的温度和含水量加速了水泥在基体中水合产物的形成，特别是氢氧化钙。 3.1.1 众所周知，这些水合产物，特别是氢氧化钙与纤维的相互作用，会对长期- 复合材料的术语性能。 3.1.2 发生的主要机制是氢氧化钙在形成玻璃纤维束的细丝束中形成。这会逐渐将细丝结合在一起，从而减少细丝的拉出。这导致复合材料的应变能力降低，从而降低了复合材料的强度，并使复合材料从韧性材料变为越来越脆的材料。 3.1.3 加速水化产物的形成加速了它们与纤维的相互作用，从而加速了复合材料的老化。 3.2 研究人员和制造商使用该试验得出的数据来评估不同混合物、增强材料、混合物成分的长期性能，并为开发由这些复合材料制成的产品的设计程序提供数据。 3.2.1 记录的数据还提供了筛选信息，因为新的矩阵和增援部队正在开发中。 3.3 如果唯一加速的反应是那些在自然风化下发生得更慢的反应，那么测试作为长期复合材料性能指标的有用性是有效的。热水会在一些复合材料中引起影响，例如那些含有丙烯酸聚合物的复合材料，而这些影响可能不会在自然风化中发生。该试验方法可能不是此类复合材料长期性能的有效指标。

1.1 This test method provides a way of accelerating the aging of glass fiber reinforced cementitious composites in order to develop data that will indicate real-life natural weathering performance. 1.2 The coupons prepared for this test method will be tested using Test Method C947 . 1.3 This test method can be used to age coupons for other test methods. 1.4 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered 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 ====== 3.1 The basis for this test as an indicator of the long term behavior of fiber reinforced composites is that elevated temperature and moisture content accelerate the formation of the products of hydration of the cement in the matrix, particularly calcium hydroxide. 3.1.1 It is known that the interaction of these products of hydration, particularly calcium hydroxide, with the fibers can have a major effect on the long-term properties of the composites. 3.1.2 The principal mechanism that occurs is that the calcium hydroxide forms within the bundles of filaments that form the glass fiber strand. This gradually bonds the filaments together, which reduces filament pull-out. This causes a reduction in the strain capacity of the composite, thereby reducing the strength of the composite and changing the composite from a ductile material to an increasingly brittle material. 3.1.3 Accelerating the formation of the hydration products accelerates their interaction with the fibers, hence accelerating the aging of the composite. 3.2 The data developed from this test are used by researchers and manufacturers to evaluate the long-term performance of different mixtures, reinforcements, mixture components, and to provide data for the development of design procedures for products made from these composites. 3.2.1 The recorded data also provides screening information as new matrices and reinforcements are developed. 3.3 The usefulness of the test as an indicator of long term composite performance is valid if the only reactions that are accelerated are those that occur more slowly under natural weathering, hot water can induce effects in some composites, for instance those containing acrylic polymer, that may not occur in natural weathering. This test method may not be a valid indicator of long-term performance of such composites.