Common Burnt Clay Building Bricks -Specification
1992 Edition

Overview of IS 1077 Scope & Principal Requirements

Scope:
This code stipulates the criteria for common burnt clay bricks intended for general construction purposes.

Important Highlights:

• Rounding of Values:
  Numerical values must comply with the rounding rules specified in IS 2:1960, preserving the same number of significant figures.

• Terminology:
  Consult IS 2248:1992 for definitions relevant to bricks.

• Associated Standards:
  Annex A enumerates Indian Standards related to IS 1077.

Brick Classification and Sizes (Clause 6.1.2)

• These represent the non-modular brick dimensions authorized by the standard.

Additional Information:

• Modular bricks generally have dimensions in multiples of 75 mm (not included here).
• The standard aims to ensure dimensional consistency and quality in masonry bricks.

flowchart TD
    A[IS 1077 Scope] --> B[Rounding Rules: IS 2:1960]
    A --> C[Terminology Reference: IS 2248:1992]
    A --> D[Related Standards: Annex A]
    A --> E[Approved Brick Sizes (Non-modular)]
    E --> F[230 x 110 x 70 mm]
    E --> G[230 x 110 x 30 mm]

For detailed mechanical attributes and testing procedures, refer to later clauses in IS 1077.

IS 1077: Related Indian Standards (Clause 2.1 & Annex A)

This specification references critical IS codes necessary for burnt clay bricks:

Important Notes:

• These standards supply the testing protocols, terminologies, and specifications to maintain uniform quality.
• IS 3495 Parts 1-3 are the primary references for compressive strength, water absorption, and efflorescence evaluations.
• Numerical rounding must adhere to IS 2 : 1960 standards.

Application:

• These referenced codes complement IS 1077 for purposes of design validation, quality assurance, and regulatory compliance.
• Always verify the most current versions and amendments issued by BIS.

For comprehensive testing details, consult the individual IS documents.

Terminology as per IS 1077

• Reference for Definitions: Terms are defined according to IS 2248:1992 covering burnt clay building bricks.
• Rounding Procedures: Numerical outcomes should be rounded as per IS 2:1960, maintaining the number of significant digits as prescribed.
• Standard Modular Brick Dimensions (Clause 6.1.1):

• Note: These sizes form the baseline for brick classification and structural design calculations.

Summary Points:

• Refer to IS 2248 for all brick-related terms.
• Apply IS 2 for rounding numerical data.
• Modular bricks are sized at 190 x 90 x 90 mm (standard) or 190 x 90 x 40 mm (thin).

flowchart LR
    A[Terminology per IS 1077] --> B[Definitions: IS 2248:1992]
    A --> C[Rounding Guidelines: IS 2:1960]
    A --> D[Standard Modular Brick Sizes]
    D --> E[190 x 90 x 90 mm]
    D --> F[190 x 90 x 40 mm]

Classification System in IS 1077 for Common Burnt Clay Bricks

1. Classes Based on Average Compressive Strength (Clause 4.1)

2. Non-Modular Brick Dimensions (Clause 6.1.2)

3. Testing and Compliance Notes

• Final test data must be rounded following IS 2:1960 rules.
• The number of significant digits should match those specified.

This classification framework assists in selecting bricks that meet required structural strength and durability benchmarks.

Quality Criteria for Common Burnt Clay Bricks as per IS 1077

1. Compressive Strength Classification (Clause 4.1, Table 1)

2. Dimensional Tolerance Limits (Clause 6.2.1)

• For Modular Bricks (90 mm height):

  • Length: 3720 to 3880 mm (nominal 3800 ± 80 mm)
  • Width: 1760 to 1840 mm (nominal 1800 ± 40 mm)
  • Height: 1760 to 1840 mm (nominal 1800 ± 40 mm)

• For Modular Bricks (40 mm height):

  • Height: 760 to 840 mm (nominal 800 ± 40 mm)

• For Non-Modular Bricks (70 mm height):

  • Length: 4520 to 4680 mm (nominal 4600 ± 80 mm)
  • Width: 2160 to 2240 mm (nominal 2200 ± 40 mm)
  • Height: 1360 to 1440 mm (nominal 1400 ± 40 mm)

• For Non-Modular Bricks (30 mm height):

  • Height: 560 to 640 mm (nominal 600 ± 40 mm)

3. Measurement Protocol (Clause 6.2.1)

• Randomly select a minimum of 20 bricks.
• Remove surface blisters and loose materials prior to measurement.
• Arrange bricks in a straight line for dimension checks.

Dimensional Specifications and Allowable Deviations as per IS 1077

1. Standard Modular Brick Dimensions (Clause 6.1.1)

2. Non-Modular Brick Dimensions (Clause 6.1.2)

3. Allowable Tolerances in Dimensions (Clause 6.2.1)

• Measurements are taken on 20 bricks arranged consecutively (refer to Fig. 2A, 2B, 2C).

• Modular Bricks (90 mm height):

  Dimension	Range (mm)	Tolerance ± (mm)
  Length	3720 - 3880	80
  Width	1760 - 1840	40
  Height	1760 - 1840	40

• Modular Bricks (40 mm height):

  Dimension	Range (mm)	Tolerance ± (mm)
  Height	760 - 840	40

• Non-Modular Bricks (70 mm height):

  Dimension	Range (mm)	Tolerance ± (mm)
  Length	4520 - 4680	80
  Width	2160 - 2240	40
  Height	1360 - 1440	40

• Non-Modular Bricks (30 mm height):

  Dimension	Range (mm)	Tolerance ± (mm)
  Height	560 - 640	40

4. Measurement Instructions (Clause 6.2.1)

• Use a steel tape or non-stretchable measuring device in one continuous measurement.
• Remove surface imperfections before measuring.

Physical Criteria for Bricks under IS 1077

Dimensions and Tolerances (Clause 6.2.1)

• Measurements should be taken on 20 bricks aligned straight (see Fig. 2A-C).
• Use a steel tape measure or equivalent without stretch.

Non-Modular Size Details (Clause 6.1.2)

Important Considerations

• Eliminate blisters and loose particles before measurement.
• Apply rounding rules as specified in IS 2:1960.
• Refer to illustrations for frog shape (Fig. 1) and measurement methodology (Fig. 2).

flowchart LR
    A[Select 20 bricks] --> B[Remove surface defects]
    B --> C[Arrange in a straight line]
    C --> D[Measure cumulative dimensions]
    D --> E[Verify compliance with tolerance limits]

Guidelines for Sampling and Compliance Evaluation as per IS 1077

• Sampling Protocol:
  Sampling shall be performed according to IS 5454:1978, which specifies methods for obtaining representative samples from batches.

• Rounding of Test Results:
  Final measured values must be rounded off per IS 2:1960, preserving the designated significant figures.

• Efflorescence Limitations:
  Assessed in accordance with IS 3495 (Part 3):1992.

  • For bricks up to Class 12.5, permissible efflorescence is up to "Moderate".
  • For bricks exceeding Class 12.5, efflorescence must be "Slight" or less.

Summary Table for Sampling and Compliance

Additional Information:

• Refer to IS 3495 (Parts 1 & 2) for tests on compressive strength and water absorption.
• Compliance is determined by comparing rounded test data against specified limits.

flowchart TD
    A[Sampling of Bricks] -->|IS 5454:1978| B[Testing of Samples]
    B --> C{Test Results}
    C -->|Round Off per IS 2:1960| D[Final Values]
    D --> E{Assess Criteria}
    E -->|Efflorescence| F[IS 3495 (Part 3)]
    E -->|Strength & Absorption| G[IS 3495 (Part 1 & 2)]
    F & G --> H[Quality Compliance Decision]

This ensures bricks adhere to the quality standards specified in IS 1077.

Marking Specifications as per IS 1077

Key Requirements (Clause 2.1 & 9.1.1):

• Manufacturer Identification:
  Manufacturers may imprint the Standard Mark as allowed in Clause 9.1.1 to indicate conformity with IS 1077.

• Rounding Off Test Data:
  Test figures must be rounded in accordance with IS 2:1960, keeping the same significant digits as stipulated.

• Relevant Standards:
  Marking should comply with related IS codes, including:

Marking Elements (from IS 2180 & IS 1077):

Marking Process Flow

flowchart TD
    A[Manufacture Bricks] --> B[Apply Manufacturer's Identification]
    B --> C[Optionally Add BIS Standard Mark]
    C --> D[Mark Brick Grade or Type]
    D --> E[Include Batch or Date Code]
    E --> F[Dispatch to Market]

For detailed marking instructions and compliance criteria, consult IS 2180:1988 and IS 3495 (Parts 1-3).