1.1这些试验方法包括硅酸盐水泥混凝土中使用的飞灰和生火山灰或煅烧火山灰的取样和试验程序。 1.2程序按以下顺序出现: 1.3以国际单位制表示的数值应视为标准。括号中给出的值仅供参考。 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和健康实践，并确定监管限制的适用性。 1.4本标准的文本引用了提供解释信息的注释和脚注。这些注释和脚注（不包括表中的注释和脚注）不应视为本标准的要求。 ====意义和用途====== 这些试验方法用于开发数据，以与规范C 618的要求进行比较 . 这些测试方法基于实验室的标准化测试，不用于模拟工作条件。 4.1.1 强度活动指数 — 强度活性指数测试用于确定在混凝土中与水硬性水泥一起使用时，粉煤灰或天然火山灰是否会导致可接受的强度发展水平。 由于试验是用砂浆进行的，因此结果可能无法提供飞灰或天然火山灰对混凝土强度贡献的直接相关性。 4.1.2 化学测试 — 化学成分的测定和对每种成分的限制都不能预测混凝土中含有水硬性水泥的粉煤灰或天然火山灰的性能，但总的来说有助于描述材料的组成和均匀性。

1.1 These test methods cover procedures for sampling and testing fly ash and raw or calcined pozzolans for use in portland-cement concrete. 1.2 The procedures appear in the following order: 1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are provided for information purposes only. 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 and health practices and determine the applicability of regulatory limitations prior to use. 1.4 The text of this standard references notes and footnotes that provide explanatory information. These notes and footnotes (excluding those in tables) shall not be considered as requirements of this standard. ====== Significance And Use ====== These test methods are used to develop data for comparison with the requirements of Specification C 618 . These test methods are based on standardized testing in the laboratory and are not intended to simulate job conditions. 4.1.1 Strength Activity Index — The test for strength activity index is used to determine whether fly ash or natural pozzolan results in an acceptable level of strength development when used with hydraulic cement in concrete. Since the test is performed with mortar, the results may not provide a direct correlation of how the fly ash or natural pozzolan will contribute to strength in concrete. 4.1.2 Chemical Tests — The chemical component determinations and the limits placed on each do not predict the performance of a fly ash or natural pozzolan with hydraulic cement in concrete, but collectively help describe composition and uniformity of the material.