1.1 本试验方法涵盖了评估混凝土中用作钢筋的FRP钢筋耐碱性的程序。耐碱性的测量方法是将FRP棒置于有或无持续拉伸应力的碱性水环境中，然后根据试验方法对其进行拉伸破坏试验 D7205/D7205M . 本标准介绍了在60℃的适度高温下进行的三个程序 ºC（140 ºF），每个定义了不同的加载条件。该试验方法也适用于从二维或三维钢筋网切割的FRP钢筋直线段。 1.2 以英寸-磅单位或国际单位表示的数值应单独视为标准。括号中显示了英寸-磅单位。每个系统中规定的值不是精确的等价物； 因此，每个系统应相互独立使用。合并两个系统的值可能会导致不符合项。 1.3 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。 1.4 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 本试验方法旨在确定材料规范、研发、质量保证以及结构设计和分析的耐碱性数据。 根据程序和测试矩阵，主要测试结果是试样的质量变化和拉伸能力保持，这是使用FRP钢筋时需要考虑的重要因素。程序A和B是加速试验，用碱性水环境代替混凝土孔隙水的存在。程序C可用于建立程序B的加速效应。 5.1.1 程序A适用于快速筛选FRP钢筋的耐碱性。 5.1.2 程序B适用于表征FRP钢筋在标准碱性水环境中持续机械荷载下的耐碱性，以代表混凝土孔隙水。 5.1.3 程序C适用于表征硅酸盐水泥混凝土中FRP钢筋在持续机械荷载下的耐碱性。

1.1 This test method covers the procedure for evaluating the alkali resistance of FRP bars used as reinforcing bars in concrete. Alkali resistance is measured by subjecting the FRP bars to an aqueous alkali environment, with or without sustained tensile stress, and then testing them to failure in tension according to Test Method D7205/D7205M . This standard presents three procedures conducted at a moderately elevated temperature of 60 ºC (140 ºF), each defining different loading conditions. The test method is also appropriate for use with linear segments of FRP reinforcements cut from two- or three-dimensional reinforcing grid. 1.2 The values stated in either inch-pound units or SI units shall be regarded separately as the standard. The inch-pound units are shown in the parentheses. The values stated in each system are not exact equivalents; therefore each system shall be used independently of each other. Combining values from the two systems may result in non-conformance. 1.3 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. 1.4 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 is intended to determine alkaline resistance data for material specifications, research and development, quality assurance, and structural design and analysis. Depending on the procedure and test matrix, the primary test results are the mass change and tensile capacity retention of the test specimen, which are important factors to be considered in the use of FRP reinforcing bars. Procedures A and B are accelerated tests, substituting an alkaline aqueous environment for the presence of concrete porewater. Procedure C can be used to establish the accelerating effect of Procedure B. 5.1.1 Procedure A is appropriate for rapid screening of FRP bars for alkali resistance. 5.1.2 Procedure B is appropriate for characterizing the alkali resistance of FRP bars under sustained mechanical loading in a standard aqueous alkaline environment intended to represent the concrete porewater. 5.1.3 Procedure C is appropriate for characterizing the alkali resistance of FRP bars under sustained mechanical loading in Portland cement concrete.