1.1 该测试方法提供了一种快速测试，以确定细骨料或矿物填料样本吸附的亚甲基蓝量，可在实验室和现场使用。 1.2 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。 1.3 本标准的文本是指提供解释性材料的注释和脚注。这些注释和脚注（不包括表和图中的注释和脚注）不应视为本标准的要求。 1.4 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。 1.5 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 本试验方法用于快速测定细骨料或矿物填料样本吸附的亚甲基蓝量。 结果报告为亚甲基蓝值，单位为每克细骨料或矿物填料吸附的亚甲基蓝mg。亚甲基蓝值是试样中粘土矿物数量和特征的函数。高亚甲基蓝值表明，由于粘土的存在，水泥混合物中细骨料或矿物填料性能降低的可能性增加。 注1: 本试验方法的结果预计不会与使用AASHTO T 330获得的结果相关 或EN 933-9 . 即使单位相同，这三种测试方法也可能给出非常不同的数值。 AASHTO T 330 仅对通过75μm筛（EN 933-9）的骨料部分进行试验 仅在小于2 mm的分数上进行试验，并且该试验在小于4.75 mm筛的分数上进行。因此，当测试相同的细骨料来源时，AASHTO测试方法将给出最高的亚甲基蓝值，因为样本中存在的任何粘土将集中在比75μm筛细的部分。AASHTO和EN试验方法分别未考虑通过75μm筛或2 mm筛的材料量。例如，通过AASHTO方法测量的亚甲基蓝值高但通过75μm筛的百分比低的细骨料对混凝土性能的影响可能小于通过AASHTO方法测量的亚甲基蓝值低但通过75μm筛的百分比高的细骨料。 相反，本试验方法表示了基于整个细骨料或矿物填料样本的亚甲基蓝值。此外，AASHTO和EN测试方法使用滴定法来确定样本吸附的已知浓度的亚甲基蓝量，并要求操作员目视确定测试终点。相反，本试验方法使用色度计检测亚甲基蓝溶液在与细骨料或矿物填料样品混合前后的浓度变化。 注2: 本试验方法中未提供特定应用中亚甲基蓝最大值的建议。 应根据细骨料或矿物填料在所考虑的应用中的成功性能确定最大亚甲基蓝值。

1.1 This test method provides a rapid test to determine the amount of methylene blue adsorbed by a specimen of fine aggregate or mineral filler and can be used both in the laboratory and in the field. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 The text of this standard refers to notes and footnotes that provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of this standard. 1.4 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. 1.5 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 used to determine rapidly the amount of methylene blue adsorbed by a specimen of fine aggregate or mineral filler. The result is reported as a methylene blue value in units of mg of methylene blue adsorbed per g of fine aggregate or mineral filler. The methylene blue value is a function of the amount and characteristics of clay minerals present in the test specimen. High methylene blue values indicate increased potential for diminished fine aggregate or mineral filler performance in a cementitious mixture due to the presence of clays. Note 1: Results from this test method are not expected to be correlated with those obtained using AASHTO T 330 or EN 933-9 . These three test methods are likely to give very different numerical values even though the units are the same. The AASHTO T 330 test is performed only on the fraction of an aggregate passing the 75 μm sieve, the EN 933-9 test is performed only on the fraction finer than 2 mm, and this test is performed on the fraction finer than the 4.75 mm sieve. Therefore, when testing the same fine aggregate source, the AASHTO test method would give the highest methylene blue value because any clay present in the specimen would be concentrated in the fraction finer than the 75 μm sieve. The AASHTO and EN test methods do not take into account the amount of material passing the 75 μm sieve or 2 mm sieve, respectively. For example, a fine aggregate with high methylene blue value measured by the AASHTO method but low percentage passing the 75 μm sieve may have less effect on concrete performance than a fine aggregate with low methylene blue value measured by the AASHTO method but a high percentage passing the 75 μm sieve. In contrast, this test method expresses methylene blue value based on the entire fine aggregate or mineral filler specimen. Additionally, the AASHTO and EN test methods use titration to determine the amount of methylene blue of known concentration that is adsorbed by a specimen and require the operator to visually determine the end point of the test. In contrast, this test method uses a colorimeter to detect the change in concentration of methylene blue solution before and after being mixed with the fine aggregate or mineral filler specimen. Note 2: Recommendations for maximum methylene blue values for specific applications are not provided in this test method. Maximum methylene blue values should be established based on successful performance of fine aggregate or mineral filler in the applications under consideration.