Removing Normal Relaxation from A416. Normal Relaxation strand is no longer manufactured in this country. The material supplied when normal relaxation is ordered may be Low Relaxation strand or may have relaxation properties that are between Normal and Low relaxation. Removing Normal Relaxation from the specification will help engineers and designers have a better understanding of the properties of materials utilized when Low Relaxation is not specified. All other relaxation types would require documentation of the properties of the material supplied.
Keywordsprestressed concrete; seven-wire strand (tendon); steel wire;