1.1 本试验方法包括在实验室和现场测定水硬性水泥混凝土的坍落度。 1.2 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。在文本中，国际单位显示在括号中。每个系统中规定的值不一定是精确的等价物；因此，为确保符合本标准，每个系统应独立使用，且两个系统的值不得组合。 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。 ( 警告 -新鲜的水硬性胶结混合物具有腐蚀性，长时间接触可能会导致皮肤和组织化学烧伤。 2. ) 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====== 4.1 本试验方法旨在为用户提供测定塑性水硬性水泥混凝土坍落度的程序。 注1: 本试验方法最初旨在提供一种监测未硬化混凝土稠度的技术。在实验室条件下，严格控制所有混凝土材料，通常发现坍落度随给定混凝土混合物的含水量成比例增加，因此与混凝土强度成反比。然而，在野外条件下，这种强度关系并没有清晰一致地显示出来。因此，应注意将现场条件下获得的坍落度结果与强度联系起来。 4.2 本试验方法适用于粗骨料含量高达1.5%的塑性混凝土 1. / 2. 在里面尺寸为[37.5 mm]。如果粗骨料大于1 1. / 2. 在里面尺寸为[37.5 mm]的试验方法适用于通过1 1. / 2. -在中。[37.5-mm]筛子，根据实践中标题为“最大粒径大骨料混凝土的附加程序”的章节去除较大骨料 C172/C172M . 4.3 本试验方法不适用于非塑性和无粘性混凝土。 注2: 坍落度小于 1. / 2. 在里面[15 mm]可能没有足够的塑性，并且混凝土的坍落度大于约9 in。 [230 mm]的内聚性可能不足以使本试验具有显著性。在解释此类结果时应谨慎。

1.1 This test method covers determination of slump of hydraulic-cement concrete, both in the laboratory and in the field. 1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined. 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. ( Warning —Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to skin and tissue upon prolonged exposure. 2 ) 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 ====== 4.1 This test method is intended to provide the user with a procedure to determine slump of plastic hydraulic-cement concretes. Note 1: This test method was originally developed to provide a technique to monitor the consistency of unhardened concrete. Under laboratory conditions, with strict control of all concrete materials, the slump is generally found to increase proportionally with the water content of a given concrete mixture, and thus to be inversely related to concrete strength. Under field conditions, however, such a strength relationship is not clearly and consistently shown. Care should therefore be taken in relating slump results obtained under field conditions to strength. 4.2 This test method is considered applicable to plastic concrete having coarse aggregate up to 1 1 / 2 in. [37.5 mm] in size. If the coarse aggregate is larger than 1 1 / 2 in. [37.5 mm] in size, the test method is applicable when it is performed on the fraction of concrete passing a 1 1 / 2 -in. [37.5-mm] sieve, with the larger aggregate being removed in accordance with the section titled “Additional Procedure for Large Maximum Size Aggregate Concrete” in Practice C172/C172M . 4.3 This test method is not considered applicable to non-plastic and non-cohesive concrete. Note 2: Concretes having slumps less than 1 / 2 in. [15 mm] may not be adequately plastic and concretes having slumps greater than about 9 in. [230 mm] may not be adequately cohesive for this test to have significance. Caution should be exercised in interpreting such results.