1.1 本规范涵盖四种熟石灰。N型和S型适用于砂浆、刮涂和棕色水泥灰泥、灰泥以及硅酸盐水泥混凝土。NA型和SA型是空气夹带的熟石灰，适用于需要石灰和空气夹带固有特性的任何上述用途。根据本规范销售的四种石灰应指定如下: 1.1.1 N型-- 砌体用普通熟石灰。 1.1.2 S型-- 砌筑用特殊熟石灰。 1.1.3 NA型-- 砌体用普通加气熟石灰。 1.1.4 SA型-- 砌体专用加气熟石灰。 注1: S型特殊熟石灰和SA型特殊引气熟石灰与N型普通熟石灰和NA型普通引气熟钙的区别主要在于它们具有高早期塑性和更高保水性的能力，以及对其未水合氧化物含量的限制。 注2: 对于普通（N型）和特殊（S型）饰面熟石灰，请参阅规范 C206 . 注3: 一些建筑规范禁止在砂浆中使用引气材料，因为这会降低粘结强度和抗压强度。在增加抗冻融性很重要的地方，夹带空气可能是有益的。不得将加气石灰用作饰面石灰。 注4: 关于石灰腻子，请参阅规范 C1489 . 1.2 以国际单位制表示的数值应视为标准。 1.3 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者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。 1.4 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 four types of hydrated lime. Types N and S are suitable for use in mortar, in scratch and brown coats of cement plaster, for stucco, and for addition to portland-cement concrete. Types NA and SA are air-entrained hydrated limes that are suitable for use in any of the above uses where the inherent properties of lime and air-entrainment are desired. The four types of lime sold under this specification shall be designated as follows: 1.1.1 Type N— Normal hydrated lime for masonry purposes. 1.1.2 Type S— Special hydrated lime for masonry purposes. 1.1.3 Type NA— Normal air-entraining hydrated lime for masonry purposes. 1.1.4 Type SA— Special air-entraining hydrated lime for masonry purposes. Note 1: Type S, special hydrated lime, and Type SA, special air-entraining hydrated lime, are differentiated from Type N, normal hydrated lime, and Type NA, normal air-entraining hydrated lime, principally by their ability to develop high, early plasticity and higher water retentivity, and by a limitation on their unhydrated oxide content. Note 2: For normal (Type N) and special (Type S) finishing hydrated lime, refer to Specification C206 . Note 3: Some building codes prohibit the use of air-entraining materials in mortar, because of the accompanying reduction in bond and compressive strength. Where increased freeze-thaw resistance is important, air-entraining may be beneficial. Air-entraining lime should not be used as a finishing lime. Note 4: For lime putty, refer to Specification C1489 . 1.2 The values stated in SI units are to be regarded as standard. 1.3 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. 1.4 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.