Method of test for building limes Determination of fineness of hydrated lime

IS 6932 Part 4 - Scope Summary

• Scope: Specifies methods for testing hydrated lime, including determination of fineness and reporting test results.

• Key Formula for Fineness (Clause 3.2):
  [ \text{Fineness %} = \frac{\text{Mass of hydrated lime passing the sieve}}{\text{Total mass of hydrated lime taken}} \times 100 ]

• Reporting: Results must be expressed as a percentage by mass of the hydrated lime sample.

• Rounding Off: Follow IS 2-1960 for rounding off test results.

• Reference Standard: IS 460 (Part 1)-1978 replaces IS 460-1962 for related specifications.

• Note on Water Quality: Use distilled water as per revised specifications for testing.

Summary Table: Key Points

flowchart TD
    A[Test Sample of Hydrated Lime] --> B[Weigh Total Mass]
    B --> C[Pass through specified sieve]
    C --> D[Weigh Mass Passing Sieve]
    D --> E[Calculate Fineness %]
    E --> F[Report Results as % by mass]

This scope ensures standardized testing and reporting for hydrated lime fineness per IS 6932 Part 4.

IS 6932 Part 4: Preparation of Sample & Fineness Test Key Points

1. Preparation of Sample (Clause 2.1)

• Follow Clause 7.2 of IS 712-1973 for sample preparation.
• Ensure representative sampling and proper handling to avoid contamination or loss.
• Use distilled water (specification revised) for washing samples.

2. Fineness Determination (Clause 3.1 & 3.2)

• Use IS test sieves arranged from coarsest (top) to finest (bottom).
• Place 100 g hydrated lime on the top sieve.
• Wash with a moderate water jet within 30 minutes; do not rub residue.
• Dry residue on each sieve at 100 ± 10°C to constant mass.
• Weigh residue on each sieve.

3. Reporting (Clause 3.2)

• Express results as percentage of mass of hydrated lime taken.

4. Key Formula for % Fineness:

[ \text{Fineness %} = \left( \frac{\text{Mass retained on sieve}}{\text{Total mass of sample}} \right) \times 100 ]

Summary Table: Fineness Test Procedure

flowchart TD
    A[Prepare Sample as per IS 712-1973] --> B[Place 100g hydrated lime on top sieve]
    B --> C[Arrange IS sieves: coarse to fine]
    C --> D[Wash with moderate water jet (≤30 min)]
    D --> E[Dry residues at 100 ± 10°C]
    E --> F[Weigh residues]
    F --> G[Calculate % mass retained per sieve]
    G --> H[Report results as % of initial mass]

For detailed sieve specifications and rounding rules, refer to IS 2-1960 and relevant IS sieve standards.

IS 6932 Part 4: Determination of Fineness of Hydrated Lime

Key Points from the Standard:

• Objective: Determine fineness by measuring residue on a standard IS sieve.
• Sieve Specification: Use IS Sieve as per IS 460-1962.
• Reagent Water: Use distilled water conforming to IS 1070-1960 when water is needed.

Procedure Summary:

1. Sample Preparation: Take a representative sample of hydrated lime.
2. Sieving: Pass the sample through the standard IS Sieve.
3. Residue Measurement: Weigh the residue retained on the sieve after sieving.
4. Fineness Calculation:
   [ \text{Fineness (%)} = 100 - \left(\frac{\text{Mass of residue on sieve}}{\text{Total mass of sample}} \times 100\right) ]

Typical Specification:

Notes:

• Finer lime improves reactivity and strength.
• Residue > 10% indicates coarse lime, affecting quality.

flowchart LR
    A[Sample of Hydrated Lime] --> B[Pass through IS Sieve (IS 460)]
    B --> C[Weigh Residue on Sieve]
    A --> D[Weigh Total Sample]
    C & D --> E[Calculate Fineness %]

This method ensures quality control of hydrated lime for construction use.

IS 6932 Part 4: Procedure for Determination of Fineness of Hydrated Lime

Key Procedure (Clause 3.1)

• Stack IS sieves (coarser on top, finer below).
• Place 100 g hydrated lime on top sieve.
• Wash material through sieves using a moderate water jet within 30 minutes.
• Do not rub residue through sieves.
• Dry residue on each sieve at 100 ± 10°C to constant mass.
• Weigh residue on each sieve.

Reporting (Clause 3.2)

• Express results as % mass of hydrated lime retained on each sieve.

Rounding Off (Clause 0.3)

• Follow IS : 2-1960 for rounding final values.

Summary Table for Fineness Test

flowchart TD
    A[Prepare Sample (100g)] --> B[Stack IS Sieves]
    B --> C[Wash with water jet (≤30 min)]
    C --> D[Dry residue at 100±10°C]
    D --> E[Weigh residue on each sieve]
    E --> F[Calculate % mass retained]

This procedure ensures accurate determination of fineness, critical for quality control of hydrated lime.

IS 6932 Part 4: Report of Test Results (Determination of Fineness of Building Limes)

Key Points & Specifications:

• Rounding Off:
  Final test values (observed or calculated) must be rounded as per IS 2-1960 (Rules for rounding off numerical values).

• Expression of Results:
  Test results for fineness shall be reported as percentage by mass of hydrated lime taken (Clause 3.2).

• Sample Preparation:
  Samples must be prepared according to Clause 7.2 of IS 712-1973.

Formula for Reporting Fineness:

[ \text{Fineness (%)} = \left(\frac{\text{Mass of lime passing the specified sieve}}{\text{Mass of hydrated lime taken}}\right) \times 100 ]

Additional Notes:

• Use distilled water of specified quality for tests (as per revised specifications).
• Test sieves must comply with the relevant IS standards.
• The standard is part of a series separating lime testing from IS 712-1964.

Summary Table: Report Format

If needed, I can provide a flowchart for the test reporting process.