1.1 This specification covers one grade of low-relaxation, seven-wire stainless steel strand for use in prestressed concrete construction. Grade 240  has a minimum tensile strength of 240 ksi [1655 MPa] based on the nominal area of the strand. 1.2 The text of this specification contains notes or footnotes, or both, that provide explanatory material. Such notes and footnotes do not contain any mandatory information. 1.4 This specification is applicable for orders in either inch-pound units (as Specification AXXX) or in SI units (as Specification AXXXM). 1.5 Units--The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. 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 specification. 1.6 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.
Keywordsprestressed concrete; seven-wire strand (tendon); steel wire; stainless steel strand
The U.S. steel-reinforced-concrete construction market is actively trying to build longer-life structures with service lives extended to 100+ years. Since reinforcing steel corrosion is a common failure mechanism when steel-reinforced concrete structures fail, solutions to this corrosion problem are in demand. The users will be strand manufacturers, testing agencies/laboratories, design engineers, structure owners, and governmental agencies such as state departments of transportation. Beginning in 2011, small testing programs and pilot projects have occurred in the United States using stainless steel alloy 2205 low-relaxation, seven-wire PC strand. These projects have been successful and have created growing demand for this product. For this product to be more easily specified and used in construction, an ASTM standard is needed.Back to Top