BIS Uncoated Stress-relieved Strands For Prestressed Concrete

A new standard, IS 6006:2014, has been developed by BIS for uncoated stress-relieved strand for prestressed concrete. Manufacturers should obtain BIS certification to ensure the quality and compliance of uncoated stress-relieved strand with BIS norms for prestressed concrete. Uncoated stress-relieved strands for prestressed concrete are used to provide high-strength reinforcement in various construction projects. These strands are composed of multiple steel wires twisted together and are specifically designed to be tensioned before the concrete is cast. Upon releasing the tension, the strands exert a compressive force on the concrete, significantly enhancing its load-bearing capacity and reducing the risk of cracking. This method of reinforcement is essential for building durable and resilient structures such as bridges, highways, and high-rise buildings. The stress-relieved process ensures that the strands have consistent mechanical properties, leading to improved performance and reliability in prestressed concrete applications.

Importance of BIS Certification

BIS certification is necessary for uncoated stress-relieved strands for prestressed concrete to ensure they meet the stringent quality and safety standards set by the Bureau of Indian Standards. This certification guarantees that the strands possess the required tensile strength, durability, and mechanical properties essential for their critical role in prestressed concrete applications. By adhering to BIS standards, manufacturers can ensure the reliability and performance of these strands, thereby enhancing the safety and longevity of infrastructure projects such as bridges, highways, and buildings. Compliance with BIS standards fosters consumer trust, ensures regulatory alignment, and supports the construction of high-quality, resilient structures.

Indian Standard IS 6006:2014

As per the latest Quality Control Order (QCO) issued by the Ministry of Steel, Government of India on 5th February 2024, the use of uncoated stress relieved strand for prestressed concrete must comply with the Indian Standard IS 6006:2014. This standard specifies the essential requirements for the manufacturing and testing of uncoated stress relieved strands used in prestressed concrete applications. Adherence to IS 6006:2014 ensures that these strands meet stringent quality and safety criteria, including the required tensile strength, ductility, and corrosion resistance. Compliance with this standard is crucial to ensure the durability, reliability, and long-term performance of prestressed concrete structures such as bridges, buildings, and other infrastructure projects, thereby supporting safety and structural integrity in construction practices across the country.

Key highlights

Product Name	Stress-relieved Strands For Prestressed Concrete
Applicable Indian Standard	IS 6006:2014
Applicable Certification Scheme	Product Certification Scheme (ISI Mark Scheme) Scheme 1 - Schedule 2
Compliance Requirement	Mandatory
QCO Link	BIS Certification Plain hard-drawn steel wire for pre-stressed concrete Part 2 as drawn wire IS 1785 (Part 2)
Scope as per Standard	This standard covers the requirements for manufacture, supply and testing of uncoated, stress relieved, high tensile steel strands for use in prestressed concrete. The following types of strands are covered: Two-wire strand Three-wire strand Seven-wire strand Class 1 and Class 2 (For classification, see Tables 2 and 3)

Tests

The following are the major tests for Uncoated Stress Relieved Strand For Prestressed Concrete

Strand
Size and Designation a) Nominal diameter b) Nominal cross-sectional area c) Nominal mass of strand
Breaking strength
Proof load
Elongation

BIS Certification Plain hard-drawn steel wire for pre-stressed concrete Part 2 as drawn wire IS 1785 (Part 2)

NOTE:

For Detailed Information about the Procedure for BIS ISI Certification, Visit :

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Procedure for Domestic Manufacturer
Procedure for Foreign Manufacturer

Timeline for BIS Certification

The approximate timeline to obtain BIS certification for Uncoated stress-relieved strands for prestressed concrete to use the ISI mark as per IS 6006:2014 is as follows:

For Indian Manufacturers (Standard Timeframe – 30 days)
For Foreign Manufacturers (Standard Timeframe – 180 days)

Conclusion:

In conclusion, uncoated stress-relieved strands for prestressed concrete play a crucial role in enhancing the strength and durability of construction projects such as bridges, highways, and buildings. These strands are designed to withstand high tension forces and exert compressive strength on concrete, thereby minimizing cracking and improving structural integrity. BIS certification ensures that these strands meet stringent quality standards, including tensile strength, durability, and mechanical properties specified in IS 6006:2014. This certification not only ensures reliability and performance but also supports safety and longevity in infrastructure development, aligning with regulatory requirements and fostering trust in construction materials across India.

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