【国外标准】 Standard Specification for Natural Cement

This specification covers natural cement. The chemical requirements and the physical requirements are detailed in the specification. The natural cement shall be subjected to fitness, autoclave expansion, time of setting, air content of mortar, and compressive strength tests using specified methods.1.1 This specification covers natural cement and quick-setting natural cement.NOTE 1: Examples of typical past uses of natural cement include unit masonry mortar, cement plaster, grout, whitewash, and concrete.1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. Values in SI units [or inch-pound units] shall be obtained by measurement in SI units [or inch-pound units] or by appropriate conversion, using the Rules for Conversion and Rounding given in IEEE/ASTM SI 10, of measurements made in other units [or SI units]. Values are stated in only SI units when inch-pound units are not used in practice.1.3 The text of this standard references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard.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.