Pulverized Fuel Ash-Lime Bricks

IS 12894: Scope - Key Specifications & Dimensions

Scope:
IS 12894 covers the standard and non-standard sizes of pulverized fuel ash-lime bricks, focusing on modularity and bond arrangements in brickwork.

Key Brick Sizes (Clause 5.1)

Notes:

• Modular bricks facilitate uniform bond patterns and dimensional coordination.
• Non-modular bricks and special sizes (1/3 length or 1/2 width) are used for proper bond arrangements.
• Refer to Fig. 1A and 1B in the standard for visual representation of these sizes.

BIS Certification (Clause 9.2.1)

• Use of the BIS Standard Mark is regulated under the Bureau of Indian Standards Act, 1986.
• Manufacturers must comply with BIS licensing conditions to use the Standard Mark.

flowchart LR
    A[Modular Bricks] -->|Standard Sizes| B(190x90x90 mm)
    A --> C(190x90x40 mm)
    D[Non-Modular Bricks] -->|Larger Sizes| E(230x110x70 mm)
    D --> F(230x110x30 mm)
    G[Special Bricks] -->|Bonding Aid| H(70x110x70 mm - 1/3 length)
    G --> I(230x50x70 mm - 1/2 width)

This concise summary helps in selecting appropriate brick sizes for design and construction per IS 12894.

IS 12894: Pulverized Fuel Ash-Lime Bricks – Key References

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

2. Brick Dimensions (Clause 5.1)

• Modular Sizes (5.1.1):

• Non-Modular Sizes (5.1.2):

3. BIS Certification (Clause 9.2.1)

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

Summary Diagram: Classification & Dimensions

graph TD
A[Pulverized Fuel Ash-Lime Bricks] --> B[Classification by Compressive Strength]
A --> C[Brick Dimensions]
B --> D[Class 30 to Class 3.5]
C --> E[Modular Sizes: 190x90x90 & 190x90x40 mm]
C --> F

IS 12894: General Requirements for Pulverized Fuel Ash-Lime Bricks

1. Classification by Compressive Strength (Clause 4.1)

Bricks are classified based on average wet compressive strength as per Table 1:

2. Dimensions and Tolerances (Clause 5.1)

• Standard Modular Sizes (mm):

• Non-Modular Sizes (mm):

• Special Sizes for Bonding:

Summary

• Use Table 1 to select brick class by compressive strength.
• Choose brick size based on modular or non-modular dimensions for

IS 12894: Classification & Dimensions of Pulverized Fuel Ash-Lime Bricks

1. Classification (Clause 4.1, Table 1)

Bricks are classified by Average Wet Compressive Strength:

2. Dimensions & Tolerances

• Bricks must have smooth rectangular faces, sharp corners, uniform shape & color. (Clause 3.5)
• Dimensions are in millimeters.

Standard Modular Sizes (Clause 5.1.1)

Non-Modular Sizes (Clause 5.1.2)

Summary Diagram of Brick Dimensions

graph LR
A[Length (L)] --> B[Width (W)]
B --> C[Height (H)]
subgraph Standard Modular
    L1(190 mm)
    W1(90 mm)
    H1(90 mm / 40 mm)
end
subgraph Non-Modular
    L2(230 mm)
    W2(

IS 12894: Dimensions and Tolerances for Pulverized Fuel Ash-Lime Bricks

1. Standard Modular Sizes (Clause 5.1.1)

2. Non-Modular Sizes (Clause 5.1.2)

3. Special Sizes for Bonding (Clause 5.1.2.1)

4. Tolerance Limits for 20 Bricks (Clause 5.2.1)

IS 12894: Pulverized Fuel Ash-Lime Bricks - Materials Key Data

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

2. Standard Dimensions (Clause 5.1.1, Table 5.1)

3. Non-Modular Dimensions (Clause 5.1.2, Table 5.1)

Notes:

• Compressive strength is tested in wet condition.
• Modular sizes facilitate uniform masonry construction.
• BIS certification and marking

IS 12894: Pulverized Fuel Ash-Lime Bricks - Physical Characteristics

1. Dimensions (Clause 5.1)

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

3. Additives (Clause 6.5)

• Suitable additives like gypsum or cement may be used.
• Must not impair brick durability.

Summary:

• Use standard modular bricks 190×90×90 mm or non-modular 230×110×70 mm.
• Choose bricks based on required compressive strength class.
• Additives allowed for durability improvement.

flowchart TD
    A[Pulverized Fuel Ash-Lime Bricks] --> B[Dimensions]
    B --> B1[Standard Modular: 190x90x90 mm]
   

Sampling and Criteria for Conformity (IS 12894)

• Sampling: As per Clause 8.1, sampling and criteria for conformity of pulverized fuel ash-lime bricks follow IS 5454. This standard details the sample size and acceptance criteria for lot inspection.

• Water Absorption Limits (Clause 12.5):
  After immersion in cold water for 24 hours (tested as per IS 3495 Part 2), the bricks should have:

  • ≤ 20% water absorption by mass for bricks up to Class 12.5
  • ≤ 15% water absorption by mass for bricks above Class 12.5

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

Summary: Sampling follows IS 5454; bricks must meet water absorption and compressive strength limits per class for conformity.

flowchart TD
    A[Sampling as per IS 5454] --> B{Test bricks}
    B --> C[Water absorption test (IS 3495 Part 2)]
    B --> D[Compressive strength test]
    C --> E{Absorption ≤ 20% (Class ≤ 12.5)?}
    C --> F{Absorption ≤ 15% (Class > 12.5)?}
    D --> G{Strength ≥ class requirement?}
    E

IS 12894: Marking and Certification Key Points

1. Marking (Clause 9.1)

• Each brick must be marked with the manufacturer's identification mark or initials.
• Marking should be clear and durable.

2. BIS Certification Mark (Clause 9.2)

• Bricks may carry the BIS Standard Mark.
• Use of the Standard Mark is governed by the Bureau of Indian Standards Act, 1986.
• Manufacturers must obtain a license from BIS to use the Standard Mark.
• Details and conditions for licensing are available from BIS offices.

3. Classification Table (Clause 4.1, Table 1)

Pulverized Fuel Ash-Lime bricks are classified by average wet compressive strength:

Summary Diagram: Marking & Certification Flow

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

Note: For detailed licensing conditions, contact BIS regional offices listed in the standard.

IS 12894 does not specify Committee Composition directly. However, based on typical IS code practices, committee composition usually involves:

• Experts in materials (brick manufacturing, quality control)
• Structural engineers
• Representatives from relevant government or standard bodies
• Industry stakeholders

Key Specifications from IS 12894 (Relevant to Bricks):

Example: Brick Strength Classes (Table 1)

If you need committee formation guidelines, refer to the relevant IS code on standardization procedures or organizational bylaws.