UNCOATED STRESS RELIEVED LOW RELAXATION SEVEN PLY STRAND FOR PRE STRESSED CONCRETE

Uncoated stress-relieved low relaxation seven-ply strand for prestressed concrete is utilized in construction to provide high-strength reinforcement in various structural applications. These strands, composed of seven steel wires twisted together, are designed to be tensioned before concrete placement, creating a compressive force upon release that significantly enhances the concrete's load-bearing capacity and reduces the risk of cracking. The low relaxation property ensures that the strands maintain their tension over time, providing consistent reinforcement and improving the overall durability and structural integrity of concrete elements. This makes them particularly suitable for critical infrastructure projects such as bridges, highways, and high-rise buildings, where long-term performance and reliability are essential.

Importance of BIS Certification

BIS certification is essential for uncoated stress-relieved low relaxation seven-ply strands for prestressed concrete to ensure they meet 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 low relaxation properties crucial for their role in prestressed concrete applications.

Adherence to BIS standards ensures that the strands are manufactured using high-quality materials and precise engineering processes, resulting in reliable and consistent performance in critical infrastructure projects such as bridges, highways, and buildings. By complying with BIS certification, manufacturers can assure consumers of the product's safety, effectiveness, and regulatory compliance, thereby fostering trust and supporting the construction of resilient and long-lasting structures.

Indian Standard IS 14268:1995

As per the latest Quality Control Order (QCO) issued by the Ministry of Steel, Government of India, on 5th February 2024, uncoated stress-relieved low relaxation seven-ply strands for prestressed concrete must adhere to the Indian Standard IS 14268:1995. This standard ensures that these strands meet essential quality and safety criteria, including the required tensile strength, durability, and low relaxation properties necessary for their application in prestressed concrete structures.

Compliance with IS 14268:1995 guarantees that the strands are manufactured to precise specifications, ensuring their reliability and performance in critical infrastructure projects such as bridges, highways, and buildings. Adherence to this standard is crucial for manufacturers to align with regulatory guidelines, maintain product consistency, and foster consumer trust in the quality and safety of construction materials.

Key highlights

Product Name	Uncoated Stress Relieved Low Relaxation Seven-ply Strand For Pre-stressed Concrete
Applicable Indian Standard	IS 14268:1995
Applicable Certification Scheme	Product Certification Scheme (ISI Mark Scheme) Scheme 1 - Schedule 2
Compliance Requirement	Mandatory
QCO Link	Uncoated Stress Relieved Low Relaxation Seven-ply Strand For Pre-stressed Concrete
Scope as per Standard	1.1 This standard covers the requirements for manufacture, supply and testing of uncoated, stress relieved, low relaxation, seven-wire (ply) steel strands for prestressed concrete. 1.1.1 The following three types of strands are covered, Plain Indented Compacted

Tests

The following are the major tests for Textiles - Polypropylene (PP) Woven, Laminated, Block Bottom Valve Sacks for Packaging of 50 kg Cement.

Surface condition
Dimensions of Indentations
Strand
Joints
Treatment of Strand
Workmanship and Finish
Nominal diameter, tolerance, nominal cross-sectional area and nominal mass per unit length of strand.
Straightness of Strand & Behavior During Cutting
Breaking strength and 0.2 percent proof load
Elongation

Uncoated Stress Relieved Low Relaxation Seven-ply Strand For Pre-stressed Concrete

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 low relaxation seven-ply strands for prestressed concrete to use the ISI mark as per IS 14268:1995 is as follows:

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

Conclusion:

In conclusion, uncoated stress-relieved low relaxation seven-ply strands play a critical role in enhancing the durability and structural integrity of prestressed concrete applications. The stringent BIS certification for these strands ensures that they meet high standards of tensile strength, durability, and low relaxation properties, essential for the construction of reliable and long-lasting infrastructure. Compliance with Indian Standard IS 14268:1995, guarantees that these strands are manufactured to precise specifications, supporting the construction of resilient structures such as bridges, highways, and high-rise buildings. Adhering to these standards fosters consumer trust, ensures regulatory alignment, and upholds the quality and safety of construction materials used in critical infrastructure projects.

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