1.1 本指南描述了近似最优SO的确定 3. 以实现用硫酸钙代替部分水泥的最大性能。 1.2 本指南涉及三氧化硫（SO 3. )仅水泥含量。矿渣水泥和偶尔的其他水硬性水泥可能含有硫化物或其他形式的硫。SO的测定 3. 快速方法的内容可能包括这些其他形式，因此可能会产生重大错误。如果出现重大错误，分析水泥的SO 3. 使用测试方法的参考测试方法的内容 C114 对于三氧化硫。 1.3 以国际单位制表示的数值应视为标准值。 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====== 3.1 本指南的目的是估算SO 3. 提供最大性能的水硬性水泥的含量。获得的数值是在规范中规定的水泥生产中确定适当硫酸盐水平的一种方法 C150/C150米 , C595/C595M 和 C1157/C1157M . 3.2 SO 3. 不同龄期、不同性能标准和不同材料（如辅助胶凝材料和化学外加剂）下，具有最大性能的水泥含量不同。 制造商可以选择性能标准来确定最佳SO 3. 所容纳之物这是最合适的 3. 内容可能是不同年龄和不同表现标准之间的折衷。 注1: 通常，最佳SO 3. 年龄越晚，含量越高。 3.3 本指南指出了最佳SO 3. 水泥含量，可选存在辅助胶凝材料和外加剂。允许使用几种替代方法:混凝土或砂浆的抗压强度、糊状物或砂浆的水化热和砂浆的干燥收缩。 3.4 不应假设最优值为 3. 本指南中的估计值与此相同 3. 现场使用相同材料制备的混凝土的最佳性能含量。最佳SO 3. 受环境和新拌混凝土温度、外加剂和辅助胶凝材料等参数的影响。 3.5 本指南适用于规范中规定的水泥 C150/C150米 , C595/C595M 和 C1157/C1157M .

1.1 This guide describes the determination of approximate optimum SO 3 for maximum performance as a result of substituting calcium sulfate for a portion of the cement. 1.2 This guide refers to the sulfur trioxide (SO 3 ) content of the cement only. Slag cements and occasionally other hydraulic cements can contain sulfide or other forms of sulfur. The determination of SO 3 content by rapid methods may include these other forms, and may therefore produce a significant error. If a significant error occurs, analyze the cement for SO 3 content using the reference test method of Test Methods C114 for sulfur trioxide. 1.3 Values stated as SI units are to be regarded as 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 ====== 3.1 The purpose of this guide is to estimate the SO 3 content for a hydraulic cement that gives maximum performance. The value obtained is one way to establish an appropriate level of sulfate in the manufacture of cements specified in Specifications C150/C150M , C595/C595M , and C1157/C1157M . 3.2 The SO 3 content of a cement giving maximum performance is different at different ages, with different performance criteria and with different materials such supplementary cementitious materials and chemical admixtures. A manufacturer can choose the performance criteriato determine optimum SO 3 content. This optimum SO 3 content may be a compromise between different ages and different performance criteria. Note 1: Typically, the optimum SO 3 content is higher the later the age. 3.3 This guide indicates optimum SO 3 content for cement, optionally in presence of supplementary cementitious materials and admixtures. Several alternate methods are allowed: compressive strength of concrete or mortar, heat of hydration of paste or mortar, and drying shrinkage of mortar. 3.4 It should not be assumed that the optimum SO 3 estimated in this guide is the same SO 3 content for optimum performance of a concrete prepared in the field using the same materials. The optimum SO 3 is influenced by parameters such as ambient and fresh concrete temperature, admixtures, and supplementary cementitious materials. 3.5 The guide is applicable to cements specified in Specifications C150/C150M , C595/C595M , and C1157/C1157M .