Common Burnt Clay Building Bricks -Specification

IS 1077: Scope Summary & Key Specifications

Scope:
IS 1077 covers specifications for common burnt clay building bricks used in general construction.

Key Points:

• Rounding Off:
  Values must be rounded per IS 2:1960 rules, retaining the same significant figures as specified.

• Definitions:
  Refer to IS 2248:1992 for brick-related terminology.

• Related Standards:
  Annex A lists necessary Indian Standards adjunct to IS 1077.

Classification & Dimensions (Clause 6.1.2)

• These are non-modular brick sizes permitted under the standard.

Additional Notes:

• Modular bricks typically have dimensions in multiples of 75 mm (not shown here).
• The standard ensures uniformity in size and quality for bricks used in masonry.

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

For detailed mechanical properties and testing, refer to further clauses in IS 1077.

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

This standard refers to several key IS codes essential for burnt clay building bricks:

Key Notes:

• These referenced standards provide testing methods, definitions, and specifications to ensure quality and uniformity.
• For compressive strength, water absorption, and efflorescence tests, IS 3495 parts 1-3 are the primary references.
• Rounding off values should comply with IS 2 : 1960 for numerical accuracy.

Usage:

• Use these standards as adjuncts to IS 1077 for design, quality control, and compliance of burnt clay bricks.
• Always refer to the latest editions and amendments from BIS.

For detailed test procedures and specifications, consult the respective IS codes directly.

IS 1077 Terminology Summary

• Reference Standard: Definitions are as per IS 2248:1992 (Burnt Clay Building Bricks).
• Rounding Off: Follow IS 2:1960 for rounding numerical values, retaining the same significant digits as specified.
• Standard Modular Brick Sizes (Clause 6.1.1):

• Note: These sizes are the basis for classification and design calculations involving bricks.

Key Points:

• Use IS 2248 for brick-related definitions.
• Round test/calculation results as per IS 2.
• Modular brick size is 190 × 90 × 90 mm (standard) or 190 × 90 × 40 mm (thin).

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

IS 1077: Classification of Common Burnt Clay Bricks

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

2. Non-Modular Brick Sizes (Clause 6.1.2)

3. Notes on Testing and Compliance

• Final test values must be rounded as per IS 2:1960 rules.
• Retain significant digits equal to those specified in the standard.

This classification helps select bricks based on structural requirements, ensuring durability and strength compliance.

IS 1077: General Quality of Common Burnt Clay Bricks

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

2. Dimensional Tolerances (Clause 6.2.1)

• Modular bricks (90 mm height):

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

• Modular bricks (40 mm height):

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

• Non-modular bricks (70 mm height):

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

• Non-modular bricks (30 mm height):

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

3. Measurement Method (Clause 6.2.1)

• Select 20 or more bricks randomly.
• Remove blisters and loose particles.
• Arrange bricks

IS 1077: Dimensions and Tolerances for Common Building Bricks

1. Standard Modular Brick Sizes (Clause 6.1.1)

2. Non-Modular Brick Sizes (Clause 6.1.2)

3. Tolerances on Dimensions (Clause 6.2.1)

• Measured on 20 bricks arranged in a straight line (Fig. 2A, 2B, 2C)

• Modular bricks (90 mm height):

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

• Modular bricks (40 mm height):

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

• Non-modular bricks (70 mm height):

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

• Non-modular bricks (30 mm height):

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

4. Measurement Method (Clause

IS 1077: Physical Requirements for Bricks

Key Dimensions & Tolerances (Clause 6.2.1)

• Dimensions are measured on 20 bricks arranged in a straight line (Fig. 2A-C).
• Measurement must be done using a steel tape or inextensible measure in one stretch.

Non-Modular Sizes (Clause 6.1.2)

Important Notes

• Remove all blisters, loose particles, and projections before measurement.
• Follow IS 2:1960 for rounding off test results.
• Refer to Fig. 1 for frog shape and size; Fig. 2 for measurement methods.

flowchart LR
    A[Select 20 bricks] --> B[Remove blisters & projections]
    B --> C[Arrange in straight line]
    C --> D[Measure overall length/width/height]
    D --> E[Check if within specified toler

IS 1077: Sampling and Criterion for Conformity of Common Bricks

• Sampling Procedure:
  Sampling of bricks shall be done as per IS 5454 : 1978. This standard details the method for selecting representative samples from a lot for testing.

• Rounding Off Test Results:
  Final test values shall be rounded off according to IS 2 : 1960, maintaining the same number of significant figures as the specified values.

• Efflorescence Limits:
  Tested as per IS 3495 (Part 3) : 1992.

  • For bricks up to Class 12.5: Efflorescence rating ≤ Moderate
  • For bricks above Class 12.5: Efflorescence rating ≤ Slight

Summary Table for Sampling & Conformity

Additional Notes:

• Refer to IS 3495 (Part 1 & 2) for compressive strength and water absorption test methods respectively.
• Conformity is decided based on test values compared to specified limits after rounding.

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

This ensures quality compliance as per IS 1077 standards.

IS 1077 - Marking of Burnt Clay Building Bricks

Key Points on Marking (Clause 2.1 & 9.1.1):

• Manufacturer's Marking:
  The manufacturer may use the Standard Mark as per Clause 9.1.1, indicating compliance with IS 1077.

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

• Referenced IS Standards:
  Marking should align with related IS codes for bricks and testing, notably:

  IS No.	Title
  2180 : 1988	Specification for heavy-duty burnt clay bricks
  3495 (Part 1 to 3) : 1992	Methods of tests for bricks (compressive strength, water absorption, efflorescence)
  2248 : 1992	Glossary for structural clay products

Summary Table for Marking Elements (from IS 2180 & IS 1077):

Visual: Marking Flow

flowchart TD
    A[Manufacture Bricks] --> B[Apply Manufacturer's Name/Logo]
    B --> C[Optional: Apply BIS Standard Mark]
    C --> D[Mark Grade/Type]
    D --> E[Mark Batch/Date Code]
    E --> F[Dispatch]

For detailed marking procedures and exact specifications, refer to IS 2180:1988 and IS 3495 (Parts 1-3) for testing compliance that supports marking validity.