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Description of ASTM-C207 2024ASTM C207-24Active Standard: Standard Specification for Hydrated Lime for Masonry PurposesASTM C207Scope 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. Keywords air entraining; hydrated lime; masonry; mortar; plasticity; popping and pitting; residue; stucco; Type N; Type NA; Type S; Type SA; unhydrated oxides; water retention; ICS Code ICS Number Code 91.100.10 (Cement. Gypsum. Lime. Mortar) DOI: 10.1520/C0207-24 The following editions for this book are also available...
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About ASTMASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of international voluntary consensus standards. Today, some 12,000 ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. ASTM’s leadership in international standards development is driven by the contributions of its members: more than 30,000 of the world’s top technical experts and business professionals representing 150 countries. Working in an open and transparent process and using ASTM’s advanced electronic infrastructure, ASTM members deliver the test methods, specifications, guides, and practices that support industries and governments worldwide. |
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