Method of test for determination of durability of natural building stones
1974 Edition

Overview of the Standard's Coverage

Scope: This standard defines the methods for durability testing of natural stones, specifying specimen dimensions, shapes, and preparation.

Important Clause Highlights:

• Clause 5.5:

  • Clearly specify specimen dimensions and geometry.
  • Typical specimen size varies according to test type (e.g., tensile, bending).

• Clause 5.6:

  • A comprehensive description of specimen preparation must be documented.
  • Preparation greatly influences result accuracy and consistency.

• Rounding Off:

  • Numerical results should be rounded as per IS 2:1960 guidelines.

Typical Specimen Dimensions Table

Reporting Essentials

• Record specimen dimensions and shape
• Detail preparation methods (machining, heat treatment, etc.)
• Specify test conditions (temperature, loading speed)
• Round off results following IS 2:1960

flowchart TD
    A[Obtain Material Sample] --> B[Specimen Fabrication]
    B --> C[Confirm Dimensions & Shape per Standard]
    C --> D[Perform Durability Test]
    D --> E[Document Results]
    E --> F[Apply Rounding as per IS 2:1960]
    F --> G[Prepare Final Report Including Specimen Details]

Summary: The standard mandates explicit documentation of specimen size, shape, and preparation to ensure repeatable and standardized testing outcomes.

Sample Selection According to the Standard

Important Excerpts from Clauses 2.1 to 2.3:

• Clause 2.1:
  Samples must be truly representative of the stone type or quality grade.

• Clause 2.2:
  Samples should be collected from either:

  • Quarried stones, or
  • Natural rock formations (detailed in sub-clauses 2.2.1 and 2.2.2).

  The quantity must be sufficient to produce the required test specimens.

• Clause 2.3:
  In case of observable quality variations, multiple samples should be selected to cover the spectrum of properties.

Practical Sampling Recommendations:

Process Flow:

flowchart TD
    A[Identify Stone Type and Grade] --> B{Is Stone Quality Consistent?}
    B -- Yes --> C[Select One Representative Sample]
    B -- No --> D[Select Multiple Samples Covering Variations]
    C --> E[Ensure Adequate Sample Size]
    D --> E
    E --> F[Proceed with Specimen Preparation]

Note: The standard emphasizes representativeness and adequacy in sampling to ensure trustworthy durability test results.

Specifications for Preparing Test Specimens

Key Requirements from the Standard:

• Number of Specimens:

  • Three specimens per test are required (Clause 3.2).

• Specimen Shape and Size:

  • Cylindrical shape
  • Diameter: 50 mm
  • Height: 100 mm (approximately twice the diameter) (Clause 3.1).

• Preparation Documentation:

  • Detailed description of specimen preparation must be included in the test report (Clause 5.6).

Specimen Size Summary Table:

Additional Remarks:

• Specimens must be prepared to maintain uniformity and accurately represent the tested stone.
• Proper curing and handling protocols should be observed before testing.
• Cylindrical shape ensures consistent stress distribution in durability testing.

flowchart LR
    A[Raw Material] --> B[Cut Cylindrical Specimens]
    B --> C{Diameter = 50 mm}
    B --> D{Height = 100 mm}
    C & D --> E[Prepare 3 Specimens]
    E --> F[Conduct Durability Tests]
    F --> G[Include Preparation Details in Report]

This ensures compliance with the standard for reliable and repeatable durability assessments.

Outline of Testing Procedure According to the Standard

• Specimen Count:

  • Each test requires three specimens (Clause 3.2).

• Specimen Dimensions:

  • Must be specified clearly as per Clause 5.5.
  • Specimens must conform to standard dimensions suitable for the test.

• Preparation Details:

  • A full account of specimen preparation steps should be provided (Clause 5.6).

• Result Reporting:

  • Final results should be rounded following IS 2:1960 (Clause 0.3).
  • Evaluation and reporting should align with Table 5 guidelines (Clause 5.6).

Testing Procedure Steps

Rounding Rules (IS 2:1960)

flowchart TD
    A[Select 3 Specimens] --> B[Measure Size & Shape]
    B --> C[Prepare Specimens]
    C --> D[Conduct Test]
    D --> E[Evaluate Results]
    E --> F[Round Off per IS 2:1960]
    F --> G[Prepare Detailed Report]

This procedure guarantees uniformity and reproducibility of results in accordance with the standard.

Guidelines for Evaluation and Reporting of Test Outcomes

Relevant Clauses:

• Clause 4.3: Continuous observation of specimens for cracks or flaking during testing.
• Clause 5.5: Clearly state specimen dimensions and shape in the report.
• Clause 5.6: Provide a thorough description of specimen preparation.

Reporting Instructions:

• Apply rounding conventions from IS 2:1960 for all final numerical results.
• Include:
  • Visual observations such as cracks and spalling.
  • Specimen dimensions and shape.
  • Methods of preparation including curing and conditioning.
  • Testing conditions and procedures.

Sample Reporting Format:

flowchart TD
    A[Specimen Preparation] --> B[Conduct Testing]
    B --> C[Inspect for Cracks/Flaking]
    B --> D[Measure Weight Loss or Other Metrics]
    C --> E[Record Visual Observations]
    D --> E
    E --> F[Compile Detailed Report]
    F --> G[Include Specimen and Preparation Details]
    F --> H[Apply Rounding Rules per IS 2:1960]

This ensures transparency, traceability, and conformity with the standard’s reporting requirements.