Pulverized Fuel Ash-Lime Bricks
2002 Edition

Overview of Specifications and Dimensions

Scope:
This standard includes both conventional and special sizes of pulverized fuel ash-lime bricks with an emphasis on modular coordination and bonding patterns.

Brick Size Details (Clause 5.1)

Notes:

• Modular bricks support consistent bonding patterns and dimensional harmony.
• Non-modular and special sizes assist in proper bond configuration.
• Refer to figures 1A and 1B within the standard for illustrative guidance.

BIS Certification Guidelines (Clause 9.2.1)

• The use of BIS Standard Mark is regulated by the Bureau of Indian Standards Act, 1986.
• Only licensed manufacturers can display the Standard Mark.

Pulverized Fuel Ash-Lime Brick Classification & Dimensions according to IS 12894

1. Strength Classification (Clause 4.1, Table 1)

2. Brick Measurements (Clause 5.1)

• Modular Dimensions:

• Non-Modular Dimensions:

3. BIS Marking (Clause 9.2.1)

• BIS trademark use is subject to licensing under the BIS Act.
• Manufacturer compliance with licensing terms is mandatory.

General Requirements for Pulverized Fuel Ash-Lime Bricks

1. Strength Classification (Clause 4.1)

Bricks are categorized by average wet compressive strength:

2. Brick Size and Tolerance Requirements (Clause 5.1)

• Modular Dimensions (mm):

• Non-Modular Dimensions (mm):

• Special Bonding Sizes:

Summary

• Selection of brick strength class should follow the classification table.
• Size choice depends on modular or non-modular bonding needs.

Classification and Size Specifications for Pulverized Fuel Ash-Lime Bricks

1. Compressive Strength Classes (Clause 4.1)

Bricks are categorized based on average wet compressive strength:

2. Dimensional Requirements and Surface Quality

• Bricks must have smooth, flat faces, sharp edges, and consistent color (Clause 3.5).
• Dimensions are measured in millimeters.

Modular Brick Sizes (Clause 5.1.1)

Non-Modular Brick Sizes (Clause 5.1.2)

Dimensions and Allowable Tolerances for Pulverized Fuel Ash-Lime Bricks

1. Modular Sizes (Clause 5.1.1)

2. Non-Modular Sizes (Clause 5.1.2)

3. Specialized Sizes for Bonding (Clause 5.1.2.1)

4. Dimensional Tolerances for Sets of 20 Bricks (Clause 5.2.1)

Key Material Details for Pulverized Fuel Ash-Lime Bricks (IS 12894)

1. Strength Classification (Clause 4.1, Table 1)

2. Standard Brick Sizes (Clause 5.1.1)

3. Non-Modular Sizes (Clause 5.1.2)

Notes:

• Compressive strength tests are conducted under wet conditions.
• Modular dimensions support uniform masonry construction.
• BIS certification and marking requirements apply.

Physical Attributes of Pulverized Fuel Ash-Lime Bricks (IS 12894)

1. Brick Dimensions (Clause 5.1)

2. Strength Classification (Clause 4.1, Table 1)

3. Additives (Clause 6.5)

• Permitted additives include materials such as gypsum or cement.
• Additives must not compromise the brick’s durability.

Summary:

• Bricks should be selected based on modular or non-modular sizes.
• Strength classes must be adhered to according to structural needs.
• Additives can improve performance without affecting durability.

Sampling Methods and Compliance Standards (IS 12894)

• Sampling: According to Clause 8.1, sampling and acceptance criteria for pulverized fuel ash-lime bricks adhere to the guidelines of IS 5454, which defines sample sizes and lot acceptance rules.

• Water Absorption Limits (Clause 12.5):

  • After 24-hour cold water immersion (tested per IS 3495 Part 2), water absorption must be:
    • ≤ 20% by mass for bricks classified up to 12.5
    • ≤ 15% by mass for bricks above class 12.5

• Classification (Clause 4.1, Table 1): Bricks are categorized by average wet compressive strength as follows:

Summary: Sampling is conducted as per IS 5454, ensuring bricks meet absorption and compressive strength parameters to be accepted.

Marking and Licensing Details for Pulverized Fuel Ash-Lime Bricks

1. Brick Marking (Clause 9.1)

• Every brick must bear a clear and lasting manufacturer’s identification mark or initials.

2. BIS Certification Mark (Clause 9.2)

• Bricks may display the BIS Standard Mark only if the manufacturer holds a valid license.
• The usage of this mark is regulated under the Bureau of Indian Standards Act, 1986.
• Licensing requirements and conditions can be obtained from BIS regional offices.

3. Strength Classification (Clause 4.1, Table 1)

Bricks are grouped by average wet compressive strength:

Process Flow for Marking & Certification

flowchart TD
    A[Brick Manufacturer] --> B[Mark Bricks with ID]
    B --> C{Apply for BIS License?}
    C -->|Yes| D[Obtain BIS License]
    D --> E[Use BIS Standard Mark]
    C -->|No| F[No BIS Mark on Bricks]
    E --> G[Bricks Marketed with Certification]
    F --> G

For detailed license terms, contact the nearest BIS office.

While IS 12894 does not explicitly detail committee membership, typical Indian Standard committees include:

• Experts in brick manufacturing and quality assurance
• Structural engineers
• Representatives from governmental and standards organizations
• Industry stakeholders and manufacturers

Important Specifications from IS 12894

Example Compressive Strength Classes

For committee formation, refer to IS codes on standardization or relevant organizational bylaws.