What is the primary difference between this wire and plain prestressing wire?

This wire has circular or oval indentations on its surface to improve mechanical bond with concrete, unlike plain wire (as per Clause 1).

What is the minimum tensile strength for a 4 mm indented wire?

1765 MPa, as specified in Table 2.

Is this wire supplied in a coil or straight length?

It is supplied in coils, which should have a sufficiently large internal diameter to ensure the wire runs out reasonably straight (as per Clause 4.2).

IS 6003

: 2010

INDENTED WIRE FOR PRESTRESSED CONCRETE

CurrentSpecializedSpecificationBIMStructural Engineering · Concrete Reinforcement (Steel)

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This standard specifies the requirements for cold-drawn, indented steel wire used for prestressing concrete. It covers material composition, manufacturing process, dimensions, mechanical properties such as tensile strength and proof stress, and testing procedures to ensure the wire's suitability for high-stress applications.

INDENTED WIRE FOR PRESTRESSED CONCRETE

Quick Reference Values

Minimum 0.2 percent proof stress for 5 mm wire1460 MPa

Minimum tensile strength for 5 mm wire1715 MPa

Minimum elongation for 5 mm wire (on 200 mm gauge length)4.0 %

Diameter tolerance for wire up to 5 mm±0.05 mm

Minimum tensile strength for 7 mm wire1570 MPa

Practical Notes

The indentations are critical for achieving a strong mechanical bond with the concrete, which is essential for effective stress transfer.

Proper storage is crucial to prevent corrosion (rust), as it can lead to stress corrosion cracking and a significant reduction in the wire's high-strength properties and ductility.

Always verify the manufacturer's test certificate against the requirements of Table 2 before accepting a consignment of wire.