1.1 本规范涵盖了在浇筑后混凝土在初凝前温度低至-5.0°C[23.0°F]时，添加到水硬水泥混凝土中的寒冷天气外加剂系统。 1.2 本规范规定了使用合适材料的寒冷天气外加剂系统的试验，如 11.1 – 11.3 或使用为特定工作提出的材料（见 11.5 ). 除非买方另有要求，否则应使用合适的混凝土浇筑材料进行测试，如 11.1 – 11.3 . 注1: 只要可行，应使用混凝土浇筑材料、混合比和特定工程的配料顺序进行测试（见 11.5 )因为凝固时间、抗压强度增益和其他性能可能会有所不同。 1.3 本规范提供了三个级别的测试。 1.3.1 级别1-- 在初始批准阶段，证明符合中定义的性能要求 表1 证明寒冷天气混合料系统符合本规范的要求。 均匀性和等效性测试（见第 6. )应进行测试，以提供结果，以便以后进行比较。 1.3.2 2级-- 有限的重新测试在 5.2 , 5.2.1 ，以及 5.2.2 符合以下要求的证明 表1 证明外加剂系统符合本规范的要求。 1.3.3 级别3-- 当买方有规定时，用于验收批次或测量批次内或批次之间的均匀性，均匀性和等效性测试（见第 6. )应使用。 1.4 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（不包括表格和图表中的注释和脚注）不应被视为本标准的要求。 1.5 以国际单位制或英寸-磅单位表示的值应单独视为标准值。每个系统中所述的值不一定是完全等效的；因此，为确保符合标准，每个系统应独立使用，两个系统的值不得组合。 1.6 以下预防性警告适用于测试方法部分，章节 11 – 18 ，本规范。 本标准并不旨在解决与其使用相关的所有安全问题（如果有的话）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践，并确定监管限制的适用性。 警告-- 新鲜的水硬性水泥混合物具有腐蚀性，长时间接触可能会对皮肤和组织造成化学灼伤。 2. 1.7 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。

1.1 This specification covers cold-weather admixture systems to be added to hydraulic-cement concrete when the temperature of the concrete immediately after placement will be as low as -5.0 °C [23.0 °F] prior to the time of initial set. 1.2 This specification stipulates tests of the cold-weather admixture system with suitable materials as described in 11.1 – 11.3 or with materials proposed for specific work (See 11.5 ). Unless otherwise requested by the purchaser, tests shall be made using suitable concreting materials as described in 11.1 – 11.3 . Note 1: Whenever practicable, tests should be made using the concreting materials, the mixture proportions, and batching sequence proposed for the specific work (See 11.5 ) because the time of setting, compressive strength gain, and other properties may vary. 1.3 This specification provides three levels of testing. 1.3.1 Level 1— During the initial approval stage, proof of compliance with the performance requirements defined in Table 1 demonstrates that the cold-weather admixture system meets the requirements of this specification. Uniformity and equivalence tests (See Section 6 ) shall be carried out to provide results against which later comparisons can be made. 1.3.2 Level 2— Limited retesting is described in 5.2 , 5.2.1 , and 5.2.2 . Proof of compliance with the requirements of Table 1 demonstrates conformity of the admixture system with the requirements of this specification. 1.3.3 Level 3— For acceptance of a lot or for measuring uniformity within or between lots, when specified by the purchaser, uniformity and equivalence tests (See Section 6 ) shall be used. 1.4 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. 1.5 The values stated in either SI units or inch-pound units are to be regarded separately as standard. 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. 1.6 The following precautionary caveat pertains to the test methods portion, Sections 11 – 18 , of this specification. 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 1.7 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.