1.1 本试验方法包括测定火山灰或炉渣在防止硅酸盐水泥混合物中骨料和碱反应引起的过度膨胀方面的有效性。评估基于在规定的试验条件下储存期间，由波特兰水泥和火山灰或炉渣（由活性骨料（硼硅酸盐玻璃）制成）的组合在砂浆棒中产生的膨胀。 1.2 单位- 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。有些值只有国际单位制，因为在实践中没有使用英寸-磅当量。 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====== 4.1 本试验方法可用作初步或筛选试验，以评估考虑使用的许多不同材料的相对有效性，以防止碱-硅反应引起的过度膨胀。 4.2 该试验方法也可用于评估拟用于特定工作的材料，以防止碱引起的过度膨胀- 二氧化硅反应，通过测试工作中使用的水泥的数量和组合。 4.3 本试验方法不评估火山灰或炉渣在混凝土中的适用性。这些材料应符合规范 C618型 规格 C989/C989M 或规格 C1240 .

1.1 This test method covers the determination of the effectiveness of pozzolans or slag in preventing the excessive expansion caused by reaction between aggregates and alkalies in portland cement mixtures. The evaluation is based on the expansion developed in mortar bars by a combination of portland cement and a pozzolan or slag, made with reactive aggregates (borosilicate glass), during storage under prescribed conditions of test. 1.2 Units— 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 non-conformance with the standard. Some values have only SI units because the inch-pound equivalents are not used in practice. 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 ====== 4.1 This test method may be used as a preliminary or screening test to evaluate the relative effectiveness of a number of different materials being considered for use to prevent excessive expansion due to alkali-silica reaction. 4.2 This test method may also be used to evaluate materials proposed for use on a particular job to prevent excessive expansion due to alkali-silica reaction, by testing in the quantity and in combination with the cement or cements to be used on the job. 4.3 This test method does not assess the suitability of pozzolans or slag for use in concrete. These materials should comply with Specification C618 , Specification C989/C989M or Specification C1240 .