prefabricated brick panel and partially precast concrete joist for flooring and roofing

IS 14143: Scope - Key Specifications & Tables

Scope Summary: IS 14143 primarily covers dimensional tolerances and quality control for moulds used in construction components, ensuring standardization and quality.

Key Specifications:

• Rounding Off Values:
  Follow IS 2:1960 for rounding off numerical values; maintain significant digits as per specified values.

• Tolerances on Mould Dimensions (Clause 6.3):

• Certification Marking (Clause 10.2.1):
  Use of BIS Standard Mark follows the Bureau of Indian Standards Act, 1986, with licensing conditions from BIS.

Additional Notes:

• The standard is supported by several related Indian Standards for comprehensive compliance.
• Committee composition includes experts from urban development, municipal corporations, research institutes, and housing authorities ensuring wide applicability.

flowchart TD
    A[IS 14143 Scope] --> B[Rounding Off - IS 2:1960]
    A --> C[Tolerances on Moulds]
    C --> D[Length ±8 mm]
    C --> E[Width ±3 mm]
    C --> F[Depth ±3 mm]
    A --> G[BIS Certification Marking]

Use IS 14143 for ensuring dimensional accuracy and quality control in mould fabrication for housing and construction components.

IS 14143 - Key References & Specifications Summary

1. Rounding Off (IS 2:1960)

• Final test/analysis values must be rounded as per IS 2:1960.
• Retain the same number of significant digits as the specified value.

2. BIS Certification Marking (Clause 10.2.1)

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

3. Tolerances on Mould Dimensions (Clause 6.3, Table 6.2.2)

Additional Notes:

• IS 14143 references several Indian Standards as adjuncts.
• The committee composition includes experts from urban development, housing, public works, and research institutions ensuring comprehensive coverage.
• For precise calculations or design, refer to relevant IS codes linked to IS 14143.

flowchart TD
    A[IS 14143 Standard] --> B[Rounding Off Rules (IS 2:1960)]
    A --> C[BIS Certification Marking]
    A --> D[Tolerances on Mould Dimensions]
    D --> E[Length ±8 mm]
    D --> F[Width ±3 mm]
    D --> G[Depth ±3 mm]

For detailed design or manufacturing, always cross-check with the latest IS codes and BIS guidelines.

IS 14143: Key Specifications for Materials

1. Material Specifications:

• Mild steel and medium tensile steel bars for reinforcement conform to IS 432 (Part 1) - 1982.
• Hard-drawn steel wire also follows relevant IS standards for concrete reinforcement.

2. Panel Dimensions & Tolerances (Clause 4.4):

Panels are designed for manual handling, structural safety, and economy.

3. Mould Dimensions & Tolerances (Clause 6.3):

Additional Notes:

• Any non-standard panel dimensions must be designed as per Clause 5 and tested as per Clause 8.
• Use IS 432 for steel reinforcement properties (yield strength, ductility).

flowchart LR
    A[Material: Mild/Medium Tensile Steel] --> B[Panel Fabrication]
    B --> C[Dimension Control]
    C --> D{Within Tolerances?}
    D -- Yes --> E[Use Panel]
    D -- No --> F[Redesign/Test per Clause 5 & 8]

This ensures structural safety and cost-effectiveness in roof/floor panel construction.

IS 14143: Dimensions and Tolerances Summary

1. Tolerances on Mould Dimensions (Clause 6.3)

2. Tolerances on Panel Dimensions (Clause 4.4)

• Note: Recommended panel dimensions ensure manual handling, structural safety, and economy.
• Custom dimensions must be designed per Clause 5 (Reinforcement) and tested as per Clause 8.

3. Additional Notes

• Bricks used must conform to IS 1077, IS 12894, IS 13757, or higher strength bricks as per IS 2180.
• Final test/calculation values should be rounded per IS 2:1960.

Quick Reference: Tolerances Table

| Element        | Length Tolerance | Width Tolerance | Thickness/Depth Tolerance |
|----------------|------------------|-----------------|---------------------------|
| Mould          | ±8 mm            | ±3 mm           | ±3 mm                     |
| Panel          | ±10 mm           | ±5 mm           | ±4 mm                     |

If you want, I can help with reinforcement design or testing procedures as per IS 14143.

Key Reinforcement Specifications from IS 14143

• Reinforcing Steel: Use as per IS 456: 1978 (General code for plain and reinforced concrete).

• RC Joist Reinforcement: Design as per IS 14142: 1994.

• Brick Panel Reinforcement:

  • Provide reinforcement along the length.
  • Use 2 bars embedded in longitudinal joints (see Fig. 1 in IS 14143).
  • For typical residential spans/dimensions, use 2 mild steel Grade I bars, 6 mm dia, per IS 432 (Part 1): 1982 without detailed calculation.

Summary Table: Reinforcement for Brick Panels

Reference for Reinforcement Design

• Follow IS 456 for steel grades, detailing, cover, and spacing.
• For joists, refer IS 14142 for detailed design methodology.

flowchart LR
    A[IS 14143 Clause 3.2] --> B[Use IS 456 steel specs]
    A --> C[Brick Panel Reinforcement]
    C --> D[2 bars, 6 mm dia, Grade I steel]
    D --> E[Embedded in longitudinal joints]
    A --> F[RC Joist Reinforcement]
    F --> G[Design as per IS 14142]

This ensures compliance with IS standards for reinforcement in brick panels and RC joists.

IS 14143: Partially Precast Joist Key Points

Geometry & Reinforcement (Clauses 4.2, 6.2)

• Shape: Rectangular joist with projecting steel stirrups tied to reinforcement for monolithic action.
• Width: Minimum 130 mm (13 cm), adjustable for structural needs.
• Height (H):
  • Minimum 100 mm for spans up to 4200 mm.
  • Minimum 125 mm for spans above 4200 mm.
• Stirrups: 6 mm diameter @ 135 mm center-to-center (c/c), or as per design.
• Main reinforcement: 2 bars of 6 mm diameter in each panel.

Materials

• Concrete: Minimum M15 grade.
• Brick bats: Broken bricks sized to panel length, with 15–30 mm gap for adjustment.

Structural Notes

• Joist width supports two successive brick panel spans with adequate bearing and gap.
• Reinforcement stirrups project out to tie with brick panels ensuring composite action.

Typical Dimensions Summary

flowchart LR
    A[Partially Precast Joist] --> B[Rectangular Section]
    B --> C[Width ≥ 130 mm]
    B --> D[Height H: 100-125 mm]
    A --> E[Reinforcement]
    E --> F[2 bars @ 6 mm]
    E --> G[6 mm Stirrups @ 135 mm c/c]
    A --> H[Concrete M15]
    A --> I[Supports two brick panels]
    I --> J[Brick bats sized to panel length]
    I --> K[15-30 mm gap for adjustment]

This ensures structural integrity and monolithic behavior between joist and brick panels as per IS 14143.

IS 14143: Sampling and Testing Key Points

Sampling Criteria (Clause 9.1)

• Acceptance: If 4 out of 5 samples meet shape & dimensional requirements (Clause 4), the lot passes.
• Rejection: More than one failure in dimensional requirements → lot rejected.

Sample Identification (Clause 7.3)

• Samples must be marked for traceability to their lot.

Testing (Annex B & Clause 4.2)

• Failure Load Test (B-4.2):

  • Load applied until panel fails by crushing/breaking.
  • If no failure, load causing deflection = 1/60th of clear span is failure load.
  • Use steel marker at mid-span with gap = 1/60th clear span to monitor deflection.

• Load Test for Partially Precast R.C. Joist (B-5):

  • Similar to prefabricated brick panel test.
  • Load applied as two point loads at middle third points.

Rounding Off (General)

• Follow IS 2:1960 for rounding final test values.
• Retain same significant digits as specified in standard.

Summary Table: Sampling & Testing

flowchart TD
    A[Sample 5 units] --> B{4 out of 5 pass?}
    B -- Yes --> C[Lot accepted]
    B -- No --> D[Lot rejected]
    C --> E[Conduct Failure Load Test]
    E --> F{Failure by crushing?}
    F -- Yes --> G[Record failure load]
    F -- No --> H[Measure deflection at 1/60th span]
    H --> I[Load at limiting deflection = failure load]

This concise guide helps ensure compliance with IS 14143 sampling and testing requirements.

IS 14143: Test Methods - Key Points & Formulas

1. Rounding Off (IS 2:1960)

• Final test values must be rounded off to the same number of significant digits as specified.

2. Failure Load Test (Clause 4.2)

• Load applied until panel failure (crushing or breaking).
• If no failure, failure load = load causing deflection = (1/60) × clear span.
• Use a steel marker below mid-span with a gap = 1/60th clear span to check deflection.

3. Load Test for Partially Precast R.C. Joist (Clause B-5)

• Similar to prefabricated brick panel test.
• Use two-point loads applied at middle third points of the span.

4. Test Types (Clause 8.1)

• Routine Tests: Dimensional & deflection recovery tests.
• Type Test: Failure load test (for new design/size or design change).

Deflection Limit Formula

[ \delta_{max} = \frac{L}{60} ]

• ( \delta_{max} ) = Maximum allowable deflection
• ( L ) = Clear span of the panel

Load Application Diagram (Failure Load Test)

graph LR
A[Load Application] -->|Uniform Load| Panel[Brick Panel]
Panel -->|Deflection ≤ L/60| Marker[Steel Marker at mid-span]

Summary:

• Use failure load test to verify strength; deflection limit = span/60.
• For R.C. joists, apply two-point loads at middle thirds.
• Rounding off as per IS 2:1960.
• Routine tests for dimensions and deflection recovery; failure load test as type test.

IS 14143: Criteria for Conformity (Clause 9)

• Dimensional Requirements (Clause 9.1):

  • Sample size: 5 units from a lot.
  • Acceptance: At least 4 out of 5 samples must satisfy shape and dimensional requirements (Clause 4).
  • Rejection: More than one panel failing dimensional criteria leads to lot rejection.

• Tests Classification (Clause 8.1):

  • Routine Tests: Dimensional test and deflection recovery test for every batch.
  • Type Test: Failure load test, done only for new design/size or design changes.

• Rounding Off (General):

  • Follow IS 2:1960 for rounding test results to the same decimal places as specified values.

Summary Table for Conformity Sampling

Notes:

• The lot is accepted only if the majority of samples meet dimensional specs.
• Failure load test ensures structural safety for new designs.
• Use BIS Standard Mark only under license as per Clause 10.2.1.

flowchart TD
    A[Sample 5 Units] --> B{Dimensional Test}
    B -->|4 Pass| C[Lot Accepted]
    B -->|>1 Fail| D[Lot Rejected]
    E[New Design/Size] --> F[Failure Load Test]
    F -->|Pass| G[Design Approved]
    F -->|Fail| H[Design Rejected]

This ensures quality control and compliance with IS 14143 standards.

IS 14143: Marking and Certification Key Points

1. Marking Requirements (Clause 10.1)

• Each component must be legibly and indelibly marked with:
  • Source of manufacture (manufacturer's identification).
  • Month and year of manufacture.

2. BIS Certification Marking (Clause 10.2 & 10.2.1)

• Use of the BIS Standard Mark is governed by the Bureau of Indian Standards Act, 1986.
• Licence conditions for use of the Standard Mark are regulated by BIS.
• Details for obtaining license are available from BIS.

3. Rounding Off (General Clause)

• Final test/analysis values should be rounded off per IS 2:1960.
• Number of significant digits retained should match the specified value.

Summary Table for Marking

flowchart TD
    A[Component] --> B[Mark Manufacturer ID]
    A --> C[Mark Month & Year of Manufacture]
    A --> D{Is BIS License Obtained?}
    D -- Yes --> E[Mark BIS Standard Mark]
    D -- No --> F[No BIS Mark]

For detailed licensing terms and mark usage, contact BIS directly.

Committee Responsible for Formulation (IS 14143)

• Committee: Housing Sectional Committee, CED 51
• Chairman: Dr. P. S. A. SUNDARAM (Ministry of Urban Development, New Delhi)
• Member Secretary: Shri J. K. PRASAD (Joint Director, Civil Engg, BIS)

Key Members Representing Various Organizations:

• Municipal Corporations (Delhi, Calcutta)
• Central Public Works Department (CPWD)
• Housing and Urban Development Corporation
• National Housing Bank
• National Council for Cement and Building Materials
• Building Materials and Technology Promotion Council
• Structural Engineering Research Centre (CSIR)
• Central Building Research Institute (CSIR)
• State Housing Boards and Authorities (Maharashtra, Tamil Nadu, Rajasthan, Meghalaya)
• Industry Representatives (M/s B. G. Shirke and Co, IRCON)
• Academia (School of Planning and Architecture, Structural Engineering Research Centre)

Notes:

• The committee composition is detailed in Annex A of IS 14143.
• The committee includes experts from government, research institutes, industry, and academia.
• Final values for tests or analyses are to be rounded off per IS 2:1960.

Summary Table of Committee Structure

This committee ensures the standard's relevance, technical accuracy, and applicability across housing and urban development sectors.

graph TD
    A[Housing Sectional Committee, CED 51] --> B(Chairman: Dr. P. S. A. SUNDARAM)
    A --> C(Member Secretary: Shri J. K. PRASAD)
    A --> D[Members]
    D --> D1[Municipal Corporations]
    D --> D2[CPWD]
    D --> D3[Research Institutes (CSIR, CBRI)]
    D --> D4[Housing Authorities & Banks]
    D --> D5[Industry Representatives]
    D --> D6[Academia]

IS 14143: Test Procedures and Sample Marking - Key Points

• Sample Marking (Clause 7.3):
  Samples must be clearly marked to identify the lot they represent for traceability.

• Testing Samples (Annex B):
  Tests are to be conducted on units as specified in Annex B (refer to IS 14143 Annex B for detailed test types and sample sizes).

• Acceptance Criteria (Clause 9.1):

  • If 4 out of 5 samples meet shape & dimensional requirements (Clause 4), the lot passes.
  • If more than 1 sample fails dimensional checks (4.1.1 to 4.1.3), the lot is rejected.

• Rounding Off (IS 2:1960):
  Test results must be rounded off according to IS 2 rules, retaining the same significant figures as the specified values.

• Certification Marking (Clause 10.2):
  Products may bear the BIS Standard Mark after certification.

Summary Table: Dimensional Acceptance

flowchart TD
    A[Sample Selection] --> B[Mark Samples for Lot ID]
    B --> C[Test Samples as per Annex B]
    C --> D{Dimensional Check Pass?}
    D -->|4 or more pass| E[Lot Accepted]
    D -->|More than 1 fail| F[Lot Rejected]

For detailed test procedures and sample sizes, refer to Annex B of IS 14143.