prefabricated brick panel and partially precast concrete joist for flooring and roofing
1994 Edition

Overview of Scope and Tolerances

Scope: This standard addresses the dimensional tolerance and quality control requirements for moulds and components used in prefabricated brick panels and partially precast concrete joists, ensuring uniformity and quality assurance.

Important Specifications:

• Rounding Off Rules:
  Adhere to the guidelines in IS 2:1960 for rounding numerical data, retaining the prescribed significant digits.

• Mould Dimension Tolerances (Clause 6.3):

• BIS Certification Mark (Clause 10.2.1):
  Usage of the Bureau of Indian Standards (BIS) mark is governed by the BIS Act, 1986, with licensing requirements enforced by BIS.

Additional Details:

• The standard is supported by related Indian Standards for comprehensive compliance.
• The formulation committee includes experts from urban development, municipal authorities, research bodies, and housing organizations.

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

Application: Use this standard to ensure dimensional precision and maintain quality in mould manufacturing for housing construction components.

Summary of Key References

1. Numerical Rounding (IS 2:1960)

• Final test and analysis figures must follow rounding rules as defined in IS 2:1960.
• Ensure the number of significant digits matches the specified values.

2. BIS Marking Requirements (Clause 10.2.1)

• Use of the BIS Standard Mark is regulated under the BIS Act, 1986.
• Licensing and usage terms are provided by BIS.

3. Permissible Tolerances for Moulds (Clause 6.3, Table 6.2.2)

Notes:

• IS 14143 cites several Indian Standards for related specifications.
• The committee includes members from urban planning, housing, public works, and research institutions.
• For detailed design, consult relevant IS codes linked with IS 14143.

flowchart TD
    A[IS 14143] --> B[Rounding Rules IS 2:1960]
    A --> C[BIS Certification]
    A --> D[Mould Dimension Tolerances]
    D --> E[Length ±8 mm]
    D --> F[Width ±3 mm]
    D --> G[Depth ±3 mm]

Always verify design parameters with the latest IS and BIS guidelines.

Essential Material Requirements in IS 14143

1. Reinforcement Materials:

• Mild steel and medium tensile steel bars must conform to IS 432 (Part 1) - 1982.
• Hard-drawn steel wire reinforcement should adhere to relevant IS standards.

2. Panel Dimensions and Allowable Variations (Clause 4.4):

Panels are designed considering ease of manual handling, structural safety, and cost efficiency.

3. Mould Dimension Tolerances (Clause 6.3):

Additional Remarks:

• Panels with non-standard dimensions should be engineered as per Clause 5 and validated according to Clause 8.
• Reinforcement properties are detailed in IS 432 for steel quality, strength, and ductility.

flowchart LR
    A[Material: Mild/Medium Tensile Steel] --> B[Fabrication of Panels]
    B --> C[Dimension Monitoring]
    C --> D{Within Allowed Tolerances?}
    D -- Yes --> E[Approved for Use]
    D -- No --> F[Redesign and Testing per Clauses 5 and 8]

These guidelines maintain structural reliability and cost-effectiveness in roofing and flooring panel production.

Summary of Dimensions and Tolerances

1. Mould Dimension Tolerances (Clause 6.3):

2. Panel Dimension Tolerances (Clause 4.4):

• Note: These dimensions ensure panels are manageable by hand, structurally safe, and economical.
• Custom sizes must be designed following Clause 5 and tested as per Clause 8.

3. Additional Guidance:

• Bricks used must comply with IS 1077, IS 12894, IS 13757, or stronger bricks conforming to IS 2180.
• Final numerical values should be rounded off according to IS 2:1960.

Quick Reference Table of Tolerances

If required, guidance on reinforcement design and testing per IS 14143 can be provided.

Reinforcement Requirements as per IS 14143

• Steel Reinforcement: Use reinforcing steel complying with IS 456: 1978 for plain and reinforced concrete.

• Reinforced Concrete Joist Reinforcement: Design according to IS 14142: 1994.

• Reinforcement in Brick Panels:

  • Two steel bars embedded longitudinally within the brick panel joints.
  • Typically, use 6 mm diameter mild steel Grade I bars as per IS 432 (Part 1): 1982 without the need for complex calculations for common residential spans.

Reinforcement Summary for Brick Panels

Additional References:

• Follow IS 456 for reinforcement detailing, cover, and spacing.
• Refer to IS 14142 for detailed joist reinforcement design.

flowchart LR
    A[Clause 3.2 IS 14143] --> B[Use IS 456 Steel Specifications]
    A --> C[Brick Panel Reinforcement]
    C --> D[Two 6 mm dia Grade I bars]
    D --> E[Placed in longitudinal joints]
    A --> F[RC Joist Reinforcement]
    F --> G[Designed as per IS 14142]

These reinforcement specifications ensure adherence to IS standards for both brick panels and precast joists.

Key Features of Partially Precast Joists in IS 14143

Geometry and Reinforcement (Clauses 4.2, 6.2)

• Rectangular cross-section joists with steel stirrups projecting outward and tied to the main reinforcement to promote monolithic behavior.
• Minimum width: 130 mm, adjustable based on structural requirements.
• Minimum height (H):
  • 100 mm for spans up to 4200 mm
  • 125 mm for spans exceeding 4200 mm
• Stirrups: 6 mm diameter spaced at 135 mm center-to-center or as per design.
• Main reinforcement consists of two 6 mm diameter bars per panel.

Materials

• Concrete Grade: Minimum M15.
• Brick bats sized to panel length with a 15 to 30 mm gap allowed for adjustment.

Structural Considerations

• Joist width accommodates two consecutive brick panel spans with sufficient bearing and spacing.
• Projecting stirrups ensure integration with brick panels for composite action.

Typical Dimensions

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

This configuration ensures strength and unified action between joist and brick panels.

Sampling and Testing Guidelines of IS 14143

Sampling Procedures (Clause 9.1)

• A batch is accepted if at least 4 out of 5 samples comply with shape and dimensional requirements (Clause 4).
• If more than one sample fails dimensional criteria, the entire batch is rejected.

Sample Identification (Clause 7.3)

• Samples must be distinctly marked to allow traceability to their respective batch.

Testing Methods (Annex B & Clause 4.2)

• Failure Load Test: Load is applied to the panel until structural failure occurs by crushing or breaking.

• If failure does not occur, the failure load is considered the load causing deflection equal to 1/60th of the clear span.

• A steel marker placed beneath the mid-span with a gap equal to this deflection is used to monitor deflection.

• Load Test for Partially Precast RC Joists: Similar procedure with two-point loading applied at the middle third points of the span.

Rounding Off

• Final test results should be rounded according to IS 2:1960, maintaining the number of significant digits specified.

Summary Table

flowchart TD
    A[Select 5 Samples] --> B{4 or More Pass?}
    B -- Yes --> C[Batch Accepted]
    B -- No --> D[Batch Rejected]
    C --> E[Conduct Failure Load Test]
    E --> F{Panel Failure by Crushing?}
    F -- Yes --> G[Record Failure Load]
    F -- No --> H[Measure Deflection at 1/60 Span]
    H --> I[Deflection Load = Failure Load]

This summary facilitates adherence to sampling and testing standards.

Overview of Test Procedures in IS 14143

1. Rounding Off (IS 2:1960)

• Test results must be rounded to the same number of significant digits as specified.

2. Failure Load Test (Clause 4.2)

• Load the panel until failure by crushing or breaking.
• If no failure occurs, the failure load corresponds to the load causing a deflection of 1/60th of the clear span.
• A steel gauge below the mid-span with a gap equal to this deflection monitors displacement.

3. Load Testing for Partially Precast RC Joists (Clause B-5)

• Similar to brick panel testing but uses two-point loading at the middle third span locations.

4. Types of Tests (Clause 8.1)

• Routine Tests: Include dimensional checks and deflection recovery assessments.
• Type Tests: Failure load tests conducted for new designs or modifications.

Deflection Limit Formula

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

Where:

• ( \delta_{max} ) = Maximum permissible deflection
• ( L ) = Clear span length

Load Application Visual

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

Summary:

• Conduct failure load tests to verify strength; deflection must not exceed span/60.
• For RC joists, apply two-point loads at middle thirds.
• Perform rounding as per IS 2:1960.
• Routine tests include dimensions and deflection recovery; type tests involve failure load.

Compliance Criteria as per IS 14143 (Clause 9)

• Dimensional Compliance (Clause 9.1):

  • Sample size: 5 components from each batch.
  • Approval: At least 4 of 5 samples must meet shape and dimensional standards.
  • Rejection: Batch rejected if more than one sample fails.

• Testing Classification (Clause 8.1):

  • Routine Tests: Dimensional verification and deflection recovery for each batch.
  • Type Tests: Failure load assessments for new designs or changes.

• Rounding Off: Follow IS 2:1960 for rounding test data consistent with specified accuracy.

Summary Table of Conformity Sampling

Additional Notes:

• Batch acceptance requires majority compliance with dimensional criteria.
• Failure load tests confirm structural safety for novel designs.
• BIS Standard Mark usage is permitted only under license as per Clause 10.2.1.

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

These rules guarantee quality assurance in compliance with IS 14143.

Marking and Certification Requirements under IS 14143

1. Marking (Clause 10.1)

• Every component must be clearly and permanently marked with:
  • Manufacturer’s identity.
  • Month and year of production.

2. BIS Certification Mark (Clauses 10.2 & 10.2.1)

• The use of BIS Standard Mark is regulated by the Bureau of Indian Standards Act, 1986.
• Licensing conditions for mark usage are governed by BIS.
• Information about license acquisition is available from BIS.

3. Rounding Off

• Test and analysis results must be rounded in accordance with IS 2:1960, retaining the specified number of significant figures.

Marking Summary Table

flowchart TD
    A[Component] --> B[Mark Manufacturer ID]
    A --> C[Mark Month & Year]
    A --> D{Is BIS License Held?}
    D -- Yes --> E[Apply BIS Standard Mark]
    D -- No --> F[BIS Mark Not Applied]

For detailed licensing terms and mark usage, consult the Bureau of Indian Standards.

Formulation Committee for IS 14143

• Committee Name: Housing Sectional Committee, CED 51
• Chairperson: Dr. P. S. A. Sundaram (Ministry of Urban Development, New Delhi)
• Member Secretary: Shri J. K. Prasad (Joint Director, Civil Engineering, BIS)

Key Members Representing Various Organizations:

• Municipal Corporations (Delhi, Kolkata)
• Central Public Works Department (CPWD)
• Housing and Urban Development Corporation (HUDCO)
• National Housing Bank (NHB)
• 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 of Maharashtra, Tamil Nadu, Rajasthan, Meghalaya
• Industry Representatives (e.g., B. G. Shirke and Co, IRCON)
• Academic Institutions (School of Planning and Architecture, Structural Engineering Research Centre)

Notes:

• The committee details are documented in Annex A of IS 14143.
• It brings together government, research, industry, and academic experts.
• Final figures for testing are rounded as per IS 2:1960.

Summary of Committee Structure

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

Testing and Sample Marking Requirements in IS 14143

• Sample Marking (Clause 7.3): All samples must be clearly marked to allow traceability to their production batch.

• Testing Protocols (Annex B): Tests are performed on units as detailed in Annex B, which specifies test types and sample sizes.

• Acceptance Criteria (Clause 9.1):

  • A batch passes if at least 4 out of 5 samples meet shape and dimensional standards (Clause 4).
  • The batch is rejected if more than one sample fails these criteria.

• Rounding Off (IS 2:1960): Test values must be rounded following IS 2 to retain the required significant digits.

• Certification Marking (Clause 10.2): Certified products may bear the BIS Standard Mark.

Dimensional Acceptance Summary

flowchart TD
    A[Select Samples] --> B[Mark Samples with Batch ID]
    B --> C[Conduct Tests per Annex B]
    C --> D{Do ≥ 4 samples pass?}
    D -->|Yes| E[Batch Accepted]
    D -->|No| F[Batch Rejected]

Refer to Annex B of IS 14143 for comprehensive testing procedures and sample sizes.