Ceramic Tiles - Methods of the test, Sampling and Basis of Acceptance, Part 6: Determination of modulus of rupture (see IS 13630: Parts 1 to 15)

IS 13630 Part 6 – Scope: Key Specifications & Table

This part of IS 13630 specifies dimensions related to rods, rubber thickness, and tile overlaps used in testing or construction.

Key Table (Clause 6.2)

Notes:

• Rod diameter, rubber thickness, and tile overlap vary with tile size.
• Rounding off values must follow IS 2:1960 rules, maintaining significant figures as per the standard.
• Use whole tiles rather than cut tiles for accurate results.

This ensures uniformity in testing and compliance verification under IS 13630 Part 6.

IS 13630 (Part 6): Key Table & Specifications

Table 1: Rod Diameter, Rubber Thickness & Tile Overlap (Clause 6.2)

Additional Specifications:

• Tile dimensions dictate rod diameter, rubber thickness, and overlap.
• Overlap beyond edge supports ensures proper load transfer and stability.
• Use whole tiles rather than cut tiles for reliable results.
• Numerical results should be rounded per IS 2:1960 rules, matching the significant figures of specified values.

This table guides the design of tile supports with appropriate rod and rubber dimensions for structural integrity.

IS 13630 Part 6 - Definitions: Key Specifications

While the standard does not explicitly define all terms under a single clause, it references related standards and provides critical dimensional guidelines in Clause 6.2 for tile supports:

Table 1: Rod Diameter, Rubber Thickness & Tile Overlap (Clause 6.2)

Notes:

• These dimensions ensure proper support and load distribution for ceramic tiles.
• Overlap beyond supports improves stability and reduces tile damage.
• The standard references ISO 13006:1998 for ceramic tile definitions and classifications.

Summary:

• Use rod diameter, rubber thickness, and tile overlap as per tile size.
• Refer to ISO 13006 for detailed tile definitions and marking.
• Always prefer these standardized dimensions over cut tiles for reliable performance.

flowchart LR
    A[Tile Dimension] --> B{≥ 95 mm}
    B -- Yes --> C[Rod Dia = 20 mm]
    B -- No --> D{<95 & ≥48 mm}
    D -- Yes --> E[Rod Dia = 10 mm]
    D -- No --> F{<48 & ≥18 mm}
    F -- Yes --> G[Rod Dia = 5 mm]
    C --> H[Rubber Thickness = 5 mm]
    E --> I[Rubber Thickness = 2.5 mm]
    G --> J[Rubber Thickness = 1 mm]
    H --> K[Overlap = 10 mm]
    I --> L[Overlap = 5 mm]
    J --> M[Overlap = 2 mm]

IS 13630 Part 6: Apparatus Specifications

• Drying Oven (Clause 4.1):

  • Operating temperature: 110 ± 5°C
  • Purpose: For drying samples under controlled temperature conditions.

• Recording Gauge (Clause 4.2):

  • Accuracy: Within ±2%
  • Used for precise measurement recording during tests.

• Rounding Off Results:

  • Follow IS 2:1960 rules for rounding numerical values.
  • Maintain the same number of significant figures as the specified value.

Summary Table:

These apparatus ensure test reliability and compliance with IS 13630 standards.

flowchart TD
    A[Sample Preparation] --> B[Drying Oven @ 110±5°C]
    B --> C[Measurement]
    C --> D[Recording Gauge ±2% Accuracy]
    D --> E[Result Rounding per IS 2:1960]

IS 13630 Part 6: Test Specimens Key Points

1. Minimum Number of Test Specimens (Clause 5.3, Table 2)

2. Specimen Placement (Clause 6.2)

• Place specimen on two supporting rods.
• Glazed/proper surface faces upward.
• Specimen projects beyond each rod by length l (refer Table 1 & Fig. 2 of the code).

3. Valid Test Results (Clause 7.1)

• Use only specimens breaking within the central portion.
• Central portion length = diameter of the central rod.
• These results calculate:
  • Average breaking strength
  • Average modulus of rupture

Summary Diagram

flowchart LR
    A[Test Specimen] --> B[Place on 2 rods]
    B --> C[Glazed surface up]
    B --> D[Project length l beyond rods]
    C --> E[Break within central portion?]
    E -- Yes --> F[Use for avg. strength & modulus]
    E -- No --> G[Discard result]

This ensures consistent, reliable strength testing per IS 13630 Part 6.

IS 13630 (Part 6): Test Procedure Key Points

1. Minimum Number of Test Specimens (Clause 5.3, Table 2)

2. Specimen Placement (Clause 6.2)

• Place the test specimen on two supporting rods.
• The glazed surface should be uppermost.
• The specimen must project beyond each support by length l (refer to Table 1 and Fig. 2 in the standard).

3. Rounding Off Results (Clause None)

• Round off test results per IS 2:1960.
• Retain the same number of significant places as specified in the standard.

Summary Diagram: Specimen Setup

flowchart LR
    A[Test Specimen] -->|Placed on| B[Two Supporting Rods]
    B --> C[Glazed Surface Up]
    B --> D[Projection Length l beyond each rod]

This ensures consistent and standardized testing of tiles per IS 13630 (Part 6).

IS 13630 Part 6 — Expression of Results (Clause 7)

• Rounding Off (Clause 7):
  Final test or analysis values must be rounded per IS 2:1960 rules, matching the number of significant figures of the specified standard value.

• Number of Results (Clause 7.2):
  At least 5 acceptable test results are required to compute an average value.

• Recording Results (Clause 7.7):
  Always note down breaking strength and modulus of rupture values for each test.

Summary Table for Expression of Results

Rounding Example (IS 2:1960)

This ensures consistency and clarity in reporting test outcomes per IS 13630 Part 6.

Basis of Acceptance as per IS 13630 (Part 6): 2006 involves:

Key Specifications:

• Minimum number of test specimens (Clause 5.3, Table 2):

  Tile Dimension (mm)	Minimum Specimens
  ≥ 48	7
  < 48 and ≥ 18	10

• Test Report must include (Clause 7.8):

  • Tile description
  • Number of specimens tested
  • Dimensions: d (depth), t (thickness), l (length), L (span length), and load F
  • Modulus of rupture and breaking strength for each specimen
  • Average modulus of rupture and breaking strength

Formulas:

• Average Breaking Strength (F_avg): [ F_{avg} = \frac{\sum F_i}{n} ]
• Average Modulus of Rupture (MOR_avg): [ MOR_{avg} = \frac{\sum MOR_i}{n} ]

Where:

• ( F_i ) = breaking strength of specimen i
• ( MOR_i ) = modulus of rupture of specimen i
• ( n ) = number of acceptable specimens

Notes:

• Results are rounded as per IS 2:1960 rules.
• Acceptance is based on average values from acceptable test results only.

flowchart TD
    A[Collect Test Specimens] --> B[Perform Tests on Each Specimen]
    B --> C[Record F, MOR for Each]
    C --> D[Calculate Averages]
    D --> E{Are Averages Within Limits?}
    E -- Yes --> F[Accept Batch]
    E -- No --> G[Reject Batch]

This ensures quality compliance for ceramic tiles under IS 13630 (Part 6).