ISO 6935-3:2023

Overview

ISO 6935-3:2023 sets out the technical requirements for factory-made welded fabric, produced from steel wires or bars with diameters from 4 mm to 18 mm. This standard focuses on welded steel fabric used as reinforcement in concrete structures, including both standard and ordinary reinforcement for prestressed concrete. It establishes consistent criteria for form, dimensions, mechanical properties, chemical composition, and conformity evaluation, ensuring reliable performance and quality in construction projects around the world.

Key Topics

ISO 6935-3:2023 covers several core areas essential for manufacturers, design professionals, and contractors using welded fabric in reinforced concrete applications:

• Product Types and Dimensions

  • Applicable to factory-made sheets or rolls of welded fabric.
  • Covers cold-reduced wires, plain bars, and ribbed bars with specific diameter and mass requirements.
  • Stipulates dimensional tolerances, wire spacing (multiples of 25 mm or 50 mm, minimum 100 mm), and overhang limits.

• Mechanical and Chemical Requirements

  • Adherence to chemical composition standards based on relevant ISO references.
  • Mechanical properties mirror those specified for component wires or bars, including tensile and bending strength.
  • Welded joints must achieve a specified minimum shear force relative to wire strength.

• Geometry and Fabrication

  • Differentiates between regular fabric (uniform diameter and spacing) and designed fabric (geometry as agreed by manufacturer and purchaser).
  • Requires all intersections of wires to be electrically resistance welded for shear-resistant connections.

• Testing and Conformity Assessment

  • Mandates tensile, bend, and weld strength tests according to standardized methods for both production and specific deliveries.
  • Lays out statistical methods for acceptance testing, with provisions for re-testing if results do not meet acceptance criteria.
  • Requires marking, labelling, and traceability for each bundle of welded fabric.

Applications

Welded steel fabric manufactured according to ISO 6935-3:2023 is a critical component in the construction sector, providing enhanced strength and durability for:

• Reinforced Concrete Structures

  • Used extensively in slabs, walls, beams, columns, and foundations where standardized reinforcement improves reliability and load-bearing capacity.

• Prestressed Concrete Applications

  • Serves as ordinary reinforcement in prestressed components to control cracking and enhance structural integrity.

• Prefabricated Concrete Elements

  • Offers uniform distribution of reinforcement in factory-made panels and modules, optimizing production efficiency and quality control.

• Infrastructure and Civil Engineering Projects

  • Ensures consistent material quality for bridges, roads, tunnels, and water treatment facilities requiring precise reinforcement solutions.

By adhering to this standard, manufacturers and builders can assure compliance with international best practices for welded fabric reinforcement, streamlining procurement and facilitating regulatory acceptance worldwide.

Related Standards

For a comprehensive approach to reinforcing steel products, the following ISO standards are closely associated with ISO 6935-3:2023:

• ISO 6935-1: Steel for the reinforcement of concrete - Part 1: Plain bars
• ISO 6935-2: Steel for the reinforcement of concrete - Part 2: Ribbed bars
• ISO 10544: Cold-reduced steel wire for the reinforcement of concrete and manufacture of welded fabric
• ISO 15630-2: Test methods for steel for the reinforcement and prestressing of concrete - Part 2: Welded fabric and lattice girders
• ISO 11082: Certification schemes for welded fabric reinforcement
• ISO 404: General technical delivery requirements for steel and steel products

These related standards further define material properties, testing protocols, and certification systems, supporting quality assurance and harmonization in reinforced concrete construction worldwide.

Keywords: ISO 6935-3, welded steel fabric, concrete reinforcement, factory-made welded mesh, reinforced concrete, steel bars, conformity testing, construction standards, international standard, structural reinforcement