【国外标准】 Standard Specification for Admixtures to Inhibit Chloride-Induced Corrosion of Reinforcing Steel in Concrete

This specification covers material for use as chloride-corrosion-inhibiting admixtures for concrete. Concrete must meet the physical requirements such as compressive strength and flexural strength. The test admixture must show corrosion-inhibiting performance with the required mean integrated macrocell current of test beams and mean corroded area of test beams as a fraction of control. At the completion of testing, the mean chloride-ion content of the test beams must be greater than or equal to the critical chloride-ion content. Two types of concrete are used to make test specimens. One, the control concrete, is made without the chloride-corrosion-inhibiting admixture. The other concrete, the test concrete, is made with the chloride-corrosion-inhibiting admixture. Tests of freshly mixed concrete include slump test, air content test, and time of setting test. Test of hardened concrete include compressive strength test, flexural strength test, resistance to freezing and thawing test, and length change test. Corrosion testing shall also be done.1.1 This specification covers material for use as chloride-corrosion-inhibiting admixtures for concrete.1.2 Results of the tests conducted to meet this specification are not to be used to rank the expected field performance of various chloride-corrosion-inhibiting admixtures.1.3 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.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 and health practices and determine the applicability of regulatory requirements prior to use. (Warning—Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to skin and tissue upon prolonged exposure.2)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.