INDENTED WIRE FOR PRESTRESSED CONCRETE

IS 6003: Scope & Key Specifications Summary

• Scope: Covers manufacture, supply, and testing of indented hard-drawn and stress-relieved wire for prestressed concrete.

• Chemical Composition, Diameter, Tensile Strength, Proof Stress (Clause 9.3.2):

  For test results: [ \text{Mean} + 0.6 \times \text{Range} \leq \text{Max Spec Limit} ] [ \text{Mean} - 0.6 \times \text{Range} \geq \text{Min Spec Limit} ] Range = Max value - Min value

• Sampling (Clause 9.1.2, Table 1):

• General Requirements: As per IS 1387 for supply, inspection, and testing.

• Additional Nominal Sizes Added: 8.00 mm, 7.00 mm, and 2.50 mm.

• Rounding Off: Follow IS 2:1960 rules for numerical values.

flowchart TD
    A[Manufacture & Supply] --> B[Testing & Inspection]
    B --> C[Chemical Composition]
    B --> D[Diameter]
    B --> E[Tensile Strength & Proof Stress]
    C & D & E --> F[Compliance Check]
    F --> G{Mean ± 0.6 Range within limits?}
    G -->|Yes| H[Accept Lot]
    G -->|No| I[Reject Lot]

This standard aligns with international practices and references IS 228 (chemical analysis), IS 1608 (tensile testing), and IS 1387 (general supply requirements).

IS 6003 Key References and Specifications Summary

1. Chemical Composition, Diameter, Tensile Strength & Proof Stress (Clause 9.3.2)

• Compliance check formula:
  • ( \text{Mean} + 0.6 \times \text{Range} \leq \text{Max Spec Limit} )
  • ( \text{Mean} - 0.6 \times \text{Range} \geq \text{Min Spec Limit} )
• Range = Max value - Min value of test results.

2. Elongation After Fracture (Clause 8.6)

3. Important Standards Referenced

• IS 228 (Parts 1-24): Chemical analysis of steels
• IS 1387: General requirements for metallurgical materials
• IS 1608: Tensile testing of metallic materials

4. Rounding Off (IS 2:1960)

• Final test values rounded to the same significant digits as specified.

5. Standard Mark & Certification (Clause 11.2.1)

• Governed by Bureau of Indian Standards Act, 1986.

Visual: Compliance Check Formula Flow

flowchart TD
    A[Test Results] --> B[Calculate Mean & Range]
    B --> C{Check Limits}
    C -->|Mean + 0.6*Range ≤ Max Limit| D[Pass Upper Limit]
    C -->|Mean - 0.6*Range ≥ Min Limit| E[Pass Lower Limit]
    D & E --> F[Complies with IS 6003]
    C -->|Fails| G[Non-compliance]

For detailed physical properties and manufacturing specs, refer to IS 6003 full text and related annexes.

IS 6003: Definitions & Key Specifications for Indented Wire for Prestressed Concrete

Key Definitions (Clause 7.00 & 9.3.2)

• Nominal Sizes: Includes additional wire diameters of 8.00 mm, 7.00 mm, and 2.50 mm.
• Chemical Composition, Diameter, Tensile Strength & Proof Stress:
  • For each property, test results must satisfy:
    • Mean + 0.6 × Range ≤ Max Spec Limit
    • Mean - 0.6 × Range ≥ Min Spec Limit
  • Range = Max test value - Min test value.

Geometrical Characteristics (Clause 5.2)

• Indentations must be:
  • Placed in two diametrically opposite lines.
  • Opposite indentations staggered (not exactly opposite).
  • Conform to agreed shape and pattern between manufacturer and purchaser.
• Two common indentation types are illustrated in Fig. 1 (refer IS 6003).

Rounding Off (Clause 7.00)

• Final test values are rounded as per IS 2:1960.
• Number of significant digits retained equals that of the specified value.

Summary Table: Test Result Compliance

Notes:

• The standard aligns with international practices and Indian field requirements.
• BIS certification and marking governed by BIS Act, 1986 (Clause 11.2.1).
• Refer to Annex A for Committee composition and stakeholder details.

flowchart LR
    A[Test Results] --> B[Calculate Mean]
    A --> C[Calculate Range]
    B --> D[Check Mean + 0.6*Range ≤ Max Limit]
    C --> D
    B --> E[Check Mean - 0.6*Range ≥ Min Limit]
    C --> E
    D & E --> F{Compliance?}
    F -->|Yes| G[Accept]
    F -->|No| H[Reject]

For detailed indentation pattern and physical properties, consult IS 6003 full text and Fig. 1.

IS 6003 - Manufacture and Materials: Key Points

1. Chemical Composition, Diameter, Tensile Strength, and Proof Stress (Clause 9.3.2)

• Let Mean = average of test results, Range = max - min of test results.
• Compliance criteria:
  • Mean + 0.6 × Range ≤ Maximum Spec Limit
  • Mean - 0.6 × Range ≥ Minimum Spec Limit

2. Manufacturer's Certificate (Clause 10.4)

• Must include:
  • Manufacturing process details.
  • Test sheet with mechanical test results and chemical composition.
  • Identification number linking test results to material batch.

3. General Material and Testing Requirements

• Follow IS 1387 for supply, inspection, and testing.
• Tensile testing per IS 1608.
• Chemical analysis per IS 228 (Parts 1-24).

4. Additional Sizes (Clause 7.00)

• New nominal wire diameters: 8.00 mm, 7.00 mm, 2.50 mm included with physical properties.

Summary Formula for Compliance Check:

Mean + 0.6 × Range ≤ Max Limit  
Mean - 0.6 × Range ≥ Min Limit

References:

• IS 1387: General supply requirements.
• IS 1608: Tensile testing.
• IS 228: Chemical analysis.

flowchart LR
    A[Manufacture] --> B[Testing at Manufacturer]
    B --> C{Inspection at Manufacturer's Works?}
    C -->|Yes| D[Direct Supply]
    C -->|No| E[Manufacturer's Certificate]
    E --> F[Includes Process + Test Sheet]
    F --> G[Purchaser Receives Material + Certificate]

This ensures traceability and quality compliance for prestressing wires.

IS 6003 — Nominal Sizes & Geometrical Characteristics of Indented Wire

Key Points from Code:

• Nominal Diameter (Clause 3.4):
  Defined as the diameter of a plain wire having the same mass per unit length as the indented wire.

• Tolerance on Nominal Diameter (Clause 6.1):
  ±0.05 mm

• Indentations (Fig. 1):

  • 1A: Elliptical indentations
  • 1B: Round indentations
    These indentations affect the wire's geometry but nominal diameter is based on mass equivalence, not physical diameter.

• No Welds (Clause 4.5):
  Finished wire must be free from welds/joints.

Typical Geometrical Characteristics:

Formula for Nominal Diameter:

If ( m ) = mass per unit length of indented wire,
and ( \rho ) = density of wire material, then

[ d = \sqrt{\frac{4m}{\pi \rho}} ]

This gives the diameter of an equivalent plain wire.

Visualization:

graph LR
A[Plain Wire Diameter (d)] --> B[Mass per unit length (m)]
B --> C[Indented Wire with elliptical/round indentations]
C --> D[Nominal Diameter = diameter of plain wire with same m]

Summary: Nominal diameter is a mass-equivalent diameter with ±0.05 mm tolerance; indentations are elliptical or round shapes affecting geometry but not nominal size directly.

IS 6003: Tolerances for Indented Wire

Key Formulas & Specifications

• Diameter Tolerance (Clause 6.1):
  [ \text{Tolerance on nominal diameter} = \pm 0.05 \text{ mm} ]

• Diameter Measurement (Clause 6.1.1):

  • Take 2 measurements at right angles at 3 locations over ≥ 250 mm length
  • Average of 6 measurements = actual diameter

• Ovality Check (Clause 6.1.2):

  • If ovality ≤ 0.5 × total diameter tolerance → no mass check needed
  • If ovality > 0.5 × total diameter tolerance → check mass by weighing

Nominal Mass & Tolerance Table (g/m)

Chemical & Mechanical Properties Tolerance (Clause 9.3.2)

For any property (e.g., tensile strength):

[ \text{Mean} + 0.6 \times \text{Range} \leq \text{Max limit} ] [ \text{Mean} - 0.6 \times \text{Range} \geq \text{Min limit} ]

Range = max value - min value of test results

Summary Diagram: Diameter Measurement & Tolerance

flowchart LR
    A[Measure diameter at 3 locations] --> B[Take 2 measurements at right angles]
    B --> C[Calculate average of 6 measurements]
    C --> D{Ovality ≤ 0.5 × 0.05 mm?}
    D -- Yes --> E[No mass check required]
   

IS 6003: Physical Requirements Summary

1. Chemical Composition, Diameter, Tensile Strength & Proof Stress (Clause 9.3.2)

• Acceptance Criteria:
  • ( \text{Mean} + 0.6 \times \text{Range} \leq \text{Max Spec Limit} )
  • ( \text{Mean} - 0.6 \times \text{Range} \geq \text{Min Spec Limit} )
• Range = difference between max and min test values.

2. Diameter & Mass Tolerances (Clause 6.1.2)

• Ovality Check:
  • If ovality ≤ 0.5 × total diameter tolerance → no section check by weighing needed.
  • If ovality > 0.5 × total diameter tolerance → section check by weighing required.

3. Elongation After Fracture (Clause 8.6)

• Gauge length: 200 mm
• Minimum elongation %:

Notes:

• Rounding off values per IS 2:1960 rules.
• Standard covers indented hard-drawn and stress-relieved wire for prestressed concrete.
• Additional sizes

IS 6003: Sampling and Test Methods – Key Points

1. Scale of Sampling (Clause 9.1 & Table 1)

• Number of coils to be randomly selected depends on lot size:

2. Number of Tests (Clause 9.2)

• Tests are performed on the selected sample coils as per the standard test procedures.

3. Test for Relaxation (Clause 8.7)

• Initial load: 70% of specified minimum tensile strength.
• Load applied over 5 minutes, held constant for 1 minute.
• Load relaxation readings start after 6 minutes.
• Test temperature: 20 ± 2°C.
• No overstressing of specimen allowed.
• Manufacturer must provide test records for similar wires.

Summary Diagram: Sampling Process

flowchart TD
    A[Lot of Coils] --> B{Lot Size?}
    B -->|Up to 25| C[Select 3 coils]
    B -->|26-65| D[Select 4 coils]
    B -->|66-180| E[Select 5 coils]
    B -->|181-300| F[Select 7 coils]
    B -->|301+| G[Select 10 coils]
    C --> H[Perform Tests]
    D --> H
    E --> H
    F --> H
    G --> H

This ensures representative sampling and reliable test results for conformity assessment.

IS 6003: Inspection and Criteria for Conformity

Key Points from Clause 9.3 (Criteria for Conformity)

• Lot conformity: A lot is conforming if all characteristics meet requirements under 9.3.2 to 9.3.4.
• Ductility test (9.3.4):
  • If any initial test piece fails, double the original samples must be tested.
  • All additional samples must pass.
  • Failure of any additional sample means the lot does not conform.

Inspection & Testing (Clause 10.1)

• General inspection/testing follows IS 1387 unless otherwise specified.
• This includes sampling methods, test procedures, and acceptance criteria.

Summary Table: Ductility Test Acceptance

Reference:

• For detailed sampling, testing methods, and acceptance criteria, refer to IS 1387.

flowchart TD
    A[Initial Samples Tested (n)] -->|Pass| B[Lot Conforms]
    A -->|Fail| C[Retest Double Samples (2n)]
    C -->|All Pass| B
    C -->|Any Fail| D[Lot Rejected]

This ensures strict quality control for ductility and overall compliance per IS 6003.

IS 6003: Delivery, Inspection, and Testing Facilities (Clause 10)

• General Requirements:
  Delivery, inspection, and testing shall comply with IS 1387 unless otherwise specified (Clause 10.1).

• Dispatch of Material:
  No material shall be dispatched without certification from the purchaser or authorized representative confirming compliance with tests and requirements of IS 6003, except if the coil/bundle carries the Standard Mark (Clause 10.2).

• Manufacturer’s Certificate:
  For uninspected wires at the manufacturer’s works, a certificate must be provided with:

  • Manufacturing process details
  • Test sheet with mechanical test results and chemical composition
  • Identification mark linking the test sheet to the material batch (Clause 10.4)

Summary Table

This ensures traceability, quality assurance, and compliance with IS 6003 standards during delivery and inspection.

IS 6003 - Identification and Markings Key Points

1. Coil Specifications (Clause 10.7):

   • Recommended coil diameter: ~1.5 m without breaks, joints, or welds.
   • Coil mass: mutually agreed between purchaser and manufacturer.
   • Each coil must have at least four tight ligatures.

2. Indentation Markings (Clause 5.2):

   • Indentations in two lines, diametrically opposite.
   • Opposite indentations staggered to avoid exact alignment.
   • Shapes/patterns mutually agreed; see Fig. 1 in IS 6003 for common types.

3. Identification Records (Clause 8.1.2):

   • Manufacturer must provide mill records with coil/bundle numbers, sizes, and identification marks before selecting test pieces.

4. BIS Certification Mark (Clause 11.2.1):

   • Use governed by BIS Act, 1986.
   • License conditions available from BIS.

Typical Indentation Layout (Conceptual)

circle
    title Coil Cross Section with Indentations
    section Indentations
    Indentations on two lines opposite each other, staggered:
    Line 1: Indentations at 0° and 180°
    Line 2: Indentations staggered at approx. 90° and 270°

Summary Table: Marking Requirements

Note: Always refer to the latest IS 6003 for detailed figures and exact marking patterns.

IS 6003: Key Specifications on Committee Composition & Sampling

Committee Composition

• Refer to Concrete Reinforcement Sectional Committee, CED 54 for detailed committee makeup (not explicitly provided in IS 6003).

Sampling & Testing (Clause 9.1.2 & 9.3.2)

Sample Size Selection (Table 1):

Criteria for Conformity (Clause 9.3.2)

For each characteristic (chemical composition, diameter, tensile strength, proof stress):

• Let Mean = average test result
• Let Range = max value - min value

The following must hold:

[ \text{Mean} + 0.6 \times \text{Range} \leq \text{Max Spec Limit} ]

[ \text{Mean} - 0.6 \times \text{Range} \geq \text{Min Spec Limit} ]

This ensures product consistency within specification limits based on statistical sampling.