Methods of physical tests for hydraulic cement, Part 5: Determination of initial and final setting times

IS 4031 Part 5 - Scope: Key Points and Specifications

• Scope: This part covers methods for physical tests on hydraulic cement, focusing on setting times and related procedures.

• Rounding Off (Clause 0.5):
  Test results must be rounded per IS 2-1960 rules, retaining the same significant figures as specified values.

• Permissible Variation on Weights (Clause 4.3, Table 1):
  Weights used for cement testing have strict permissible variations:

• Reporting Results (Clause 6.1):
  Initial and final setting times must be reported to the nearest 5 minutes.

• Balance Requirements (Clause 4.2):
  The balance used must meet accuracy standards compatible with the permissible weight variations.

Summary Diagram: Cement Testing Process Scope

flowchart TD
    A[Start: Cement Sample] --> B[Weighing with Standard Weights]
    B --> C{Weight Within Permissible Variation?}
    C -- Yes --> D[Conduct Physical Tests]
    C -- No --> B
    D --> E[Record Setting Times]
    E --> F[Round off Results (IS 2-1960)]
    F --> G[Report Results (nearest 5 mins)]

This standard ensures accuracy and consistency in cement testing by specifying equipment tolerances, rounding rules, and reporting precision.

IS 4031 Part 5: Sampling & Selection of Test Specimen for Setting Time of Cement

Key Points from Clause 2.1 & Related Clauses:

• Sampling Procedure:

  • Samples must be taken as per IS 3535-1986 and relevant cement type standards.
  • The sample should be representative and thoroughly mixed before testing.

• Specimen Selection:

  • No explicit specimen size/formula given in this part; follow IS 4031 Part 4 for mould specifications.
  • Use standard moulds as per IS specifications for test specimens.

• Rounding Off Results:

  • Follow IS 2-1960 rules for rounding numerical results.
  • Report setting times to the nearest 5 minutes (Clause 6.1).

Summary Table for Sampling & Testing:

Additional Notes:

• Ensure temperature and humidity control during testing as per IS 4031 Part 5.
• The initial and final setting times are determined on standard cement paste prepared from the sampled cement.

flowchart TD
    A[Sampling of Cement] --> B[Representative Sample per IS 3535]
    B --> C[Thorough Mixing]
    C --> D[Prepare Standard Paste]
    D --> E[Test Specimen in Standard Mould (IS 4031 Part 4)]
    E --> F[Determine Initial & Final Setting Times]
    F --> G[Round off Results (IS 2-1960)]
    G --> H[Report Results to Nearest 5 Minutes]

This concise guide ensures compliance with IS 4031 Part 5 for sampling and specimen selection in setting time tests.

IS 4031 Part 5: Temperature and Humidity Specifications

• Moulding Room & Materials Temperature:
  Maintain at 27 ± 2°C (Clause 3.1).

• Laboratory Relative Humidity:
  Maintain at 65 ± 5% (Clause 3.1).

• Moist Closet / Moist Room Conditions:
  Maintain at 27 ± 2°C and ≥ 90% relative humidity (Clause 3.2).

Key Points:

• Temperature and humidity control is critical for consistent cement testing, especially for initial and final setting times.
• Samples must be representative and thoroughly mixed (Clause 2.1).
• Rounding off test results should follow IS 2-1960 rules for numerical precision.

Summary Table:

This ensures reproducibility and accuracy in cement testing as per IS 4031 Part 5.

IS 4031 Part 5 (1988) - Apparatus and Equipment for Cement Testing

Key Specifications:

• Temperature & Humidity for Testing:

  • Moulding room, dry materials, water: 27 ± 2°C
  • Laboratory relative humidity: 65 ± 5%

• Balance Requirements:

  • Permissible variation at 1000 g load: ± 1.0 g
  • For new balance: half of above, i.e., ± 0.5 g
  • Sensibility reciprocal ≤ twice permissible variation
  • Self-indicating balances with equivalent accuracy are allowed

• Vicat Apparatus:

  • Must conform to IS 5513:1976
  • Used for determination of initial and final setting times of cement

Rounding Off Results:

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

Summary Table:

flowchart TD
    A[Testing Environment] --> B{Conditions}
    B -->|Temp| C[27 ± 2°C]
    B -->|Humidity| D[65 ± 5%]
    A --> E[Equipment]
    E --> F[Balance]
    F --> G[±1.0 g variation at 1000 g]
    E --> H[Vicat Apparatus]
    H --> I[IS 5513:1976]

This ensures reproducible and accurate cement testing results as per IS 4031 Part 5.

IS 4031 Part 5: Test Procedure for Initial and Final Setting Time of Cement

Key Points from the Code:

• Scope (Clause 1.1): Procedure to determine initial and final setting times of cement.
• Rounding Off (Clause 0.5): Results are rounded per IS 2-1960 rules, retaining the same significant figures as specified.
• Reporting (Clause 6.1): Setting times reported to the nearest 5 minutes.
• Balance Requirements (Clause 4.2): Balance must meet specified accuracy (usually ±0.01 g or better).

Test Procedure Overview:

1. Prepare Standard Cement Paste (per IS 4031 Part 4):
   • Mix cement with water at a specified ratio to form a paste.
2. Filling the Vicat Mould:
   • Use standard moulds as per specifications.
3. Penetration Test:
   • Use Vicat apparatus with a specified needle.
   • Measure penetration at intervals to determine:
     • Initial Setting Time: When needle penetration is 25 mm.
     • Final Setting Time: When needle fails to penetrate 0.5 mm from bottom.
4. Record Times:
   • Start timing immediately after mixing.
   • Report times to nearest 5 minutes.

Summary Table: Setting Time Criteria

Notes:

• Use a balance accurate to 0.01 g for weighing cement and water.
• Follow IS 2-1960 for rounding off numerical results.
• Ensure environmental conditions (temperature, humidity) are controlled as per standard.

flowchart TD
    A[Start Mixing Cement Paste] --> B[Fill Vicat Mould]
    B --> C[Insert Needle]
    C --> D{Needle Penetration}
    D -->|25 mm| E[Record Initial Setting Time]
    D -->|< 0.5 mm| F[Record Final Setting Time]
    E --> G[Report Results (nearest 5 min)]
   

IS 4031 Part 5 - Reporting of Results: Key Points

• Rounding of Results (Clause 2.1):
  Final values for setting times must be rounded off according to IS 2-1960 rules. The number of significant digits in the reported value should match the standard's specified value.

• Setting Time Reporting (Clause 6.1):
  Initial and final setting times shall be reported to the nearest 5 minutes.

• Permissible Variation on Weights (Clause 4.3, Table 1):
  Weights used for weighing cement must conform to the permissible variations:

Summary for Reporting:

• Report initial and final setting times rounded to nearest 5 minutes.
• Use weights within permissible tolerance for accuracy.
• Follow rounding rules per IS 2-1960.

flowchart TD
    A[Conduct Setting Time Test] --> B[Record Initial Setting Time]
    B --> C[Round to nearest 5 minutes]
    A --> D[Record Final Setting Time]
    D --> E[Round to nearest 5 minutes]
    C --> F[Report Results]
    E --> F
    F --> G[Ensure weights used conform to permissible variation]

This ensures consistency, accuracy, and compliance with IS 4031 Part 5 standards.