ISO 6934-3:1991

Overview

ISO 6934-3:1991 specifies the requirements for round high tensile steel wire used in the prestressing of concrete, focusing particularly on quenched and tempered wire. This standard, developed by the International Organization for Standardization (ISO), covers wire with plain, ribbed, grooved, or indented surfaces, and is applicable for nominal wire diameters ranging from 6.0 mm to 16.0 mm. It aims to ensure the quality, reliability, and performance of prestressing steel wire in concrete construction worldwide by specifying dimensions, strength, surface configuration, and related properties.

Key Topics

• Product Scope: Covers round, high tensile steel wires for prestressing concrete, including plain, ribbed, grooved, and indented surface types.
• Nominal Diameter Range: Specifies parameters for wire diameters from 6.0 mm to 16.0 mm.
• Manufacturing Conditions: Wires must be made from high tensile steel according to ISO 6934-1 and delivered in coils without welds or other joints.
• Surface Configurations: The surface may be plain, ribbed, grooved, or indented to improve bonding with concrete.
• Mechanical Properties:
  • Tensile Strength: Each wire must meet characteristic tensile strength and proof stress requirements.
  • Elongation and Ductility: Specifies minimum elongation at maximum force and mandates ductile fracture behavior.
  • Relaxation Properties: The relaxation value after 1,000 hours at specified initial stress levels must meet class-specific limits.
  • Fatigue Resistance: Wires must withstand specified fatigue cycles if required by the purchaser.
• Testing Methods: Includes references to reverse bend and rebend tests per ISO 7801 and ISO 10065 to verify flexibility and ductility.

Applications

• Prestressed Concrete Structures: Used in beams, slabs, bridges, and other concrete elements where increased load capacity, crack control, and structural durability are required.
• Civil Engineering Projects: Widely applied in infrastructure such as highways, high-rise buildings, parking structures, and railway sleepers.
• Construction Industry: Enables innovative architectural designs and longer spans thanks to the enhanced properties of prestressing steel.

Utilizing steel wire meeting ISO 6934-3:1991 ensures that prestressed concrete elements achieve the required performance in safety, longevity, and resistance to cracking or deformation.

Related Standards

Implementing ISO 6934-3:1991 often involves coordination with other international standards, including:

• ISO 6934-1:1991 - General requirements for steel for the prestressing of concrete.
• ISO 6934-2:1991 - Cold-drawn wire for prestressing.
• ISO 6934-4:1991 - Strand for prestressing.
• ISO 6934-5:1991 - Hot-rolled steel bars for prestressing, with or without subsequent processing.
• ISO 7801:1984 - Reverse bend test method for metallic wire.
• ISO 10065:1990 - Bend and rebend tests for steel reinforcement bars.

By adhering to ISO 6934-3:1991 and its related standards, manufacturers, designers, and contractors can ensure compliance in international concrete prestressing applications, meeting industry expectations for quality and safety in steel wire products.