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See Chinese contents: GB/T 21839-2008 GB/T 21839-2008: Steel for prestressed concrete -- Test methods
This Standard specifies the test methods for tensile, bend, reverse bend, torsion, wrapping, isothermal relaxation, fatigue, stress corrosion, deflected tensile, chemical analysis, measurement of the geometrical dimensions, and determination of the relative rib area of the steel for prestressed concrete.
