1.1 这些测试方法包括石膏、石膏和石膏混凝土的物理测试。 1.2 试验方法见以下章节: 物理测试注意事项 4. 试剂和材料 5. 游离水 6. 细度 7. 石膏的正常稠度 8. 石膏混凝土的正常稠度 9 凝结时间 10 凝固时间（温升法） 11 抗压强度 12 密集 13 1.3 被视为标准值的单位为英寸-磅单位或SI（公制）。首先说明的数值应视为标准。 括号中给出的值是数学转换，仅供参考，不被视为标准值。 1.4 本标准的文本引用了提供解释材料的注释和脚注。这些注释和脚注（不包括表和图中的注释和脚注）不是本标准的要求。 1.5 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。 有关具体的预防说明，请参阅 X1.2.1 . 1.6 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。

1.1 These test methods cover the physical testing of gypsum, gypsum plasters, and gypsum concrete. 1.2 The test methods appear in the following sections: Precautions for Physical Tests 4 Reagents and Materials 5 Free Water 6 Fineness 7 Normal Consistency of Gypsum Plaster 8 Normal Consistency of Gypsum Concrete 9 Setting Time 10 Setting Time (Temperature Rise Method) 11 Compressive Strength 12 Density 13 1.3 The values regarded as standard are either in inch-pound units or SI (metric). The values stated first shall be regarded as the standard. The values given in parentheses are mathematical conversions that are provided for information only and are not considered standard. 1.4 The text of this standard references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) are not requirements of the standard. 1.5 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. For a specific precautionary statement, see X1.2.1 . 1.6 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.