Methods of test for stabilized soils, Part 8: Determination of lime content of lime stabilized soils

IS 4332 Part 8 - Scope: Key Specifications & Tables

Soil Classification (Clause 2.1)

Sample Dividers - Riffle Box Openings (Clause 3.8)

Lime Content Determination (Appendix A, Clause 7.2.1)

• Sample weight (W): Oven dry soil weight (g)
• Volume titrated (V): EDTA solution volume (ml)
• Formulas for lime content:

[ \text{Lime content (%)} = 100 \times \frac{Y \times X}{W} \quad \text{where } X, Y \text{ depend on soil type} ]

• Refer Appendix A proforma for detailed recording.

Summary

• Use riffle box openings based on soil grading for sample splitting.
• Soil classification is based on percentage passing specified IS sieves.
• Lime content calculation involves titration data and oven-dry sample weight.

For detailed procedure and proforma, see Appendix A of IS 4332 Part 8.

flowchart TD
    A[Soil Sample] --> B{Determine Grain Size}
    B -->|Fine| C[Use 6 mm riffle box opening]
    B -->|Medium| D[Use 6 mm & 2.5 cm openings]
    B -->|Coarse| E[Use 6 mm & 5 cm openings]
    A --> F[Oven Dry Sample Weight W]
    F --> G[EDTA Titration Volume V]
    G --> H[Calculate Lime Content]

Note: Always refer to the latest edition of IS 4332 Part 8 for updates.

IS 4332 Part 8 - Key Definitions & Specifications

1. Soil Grading Definitions (Clause 2.1)

2. Sample Dividers - Riffle Box Opening Widths (Clause 3.8)

3. Lime Content Determination (Appendix A, Clause 7.2.1)

• Weight of oven dry sample: ( W ) (g)

• Volume of EDTA titrated: ( V ) (ml)

• Lime content (% weight of soil lime):

  [ TC = 100 \times \frac{Y}{X} ]

  where ( X ) and ( Y ) are calculated from titration volumes and sample weights as per the standard.

• Lime content (% weight of dry soil):

  [ C = \frac{(C_1 - C_2)}{C_3} \times 100 ]

  (Refer to Appendix A for detailed variables)

Summary Diagram: Soil Grading & Sample Divider Selection

flowchart TD
    A[Soil Sample] --> B{Grain Size}
    B -->|Fine (<2mm)| C[Use 6mm riffle box]
    B -->|Medium (2mm-20mm)| D[Use 6mm & 2.5cm riffle box]
    B -->|Coarse (20mm-40mm)| E[Use 6mm & 5cm riffle box]

Note: Use IS 4332 Part 8 for detailed test procedures and proforma for lime content recording.

IS 4332 Part 8 — Apparatus Key Points

1. Sample Dividers (Clause 3.8)

Use multiple slot riffle boxes with slot widths depending on soil type:

2. Electric Hotplate or Bunsen Burner (Clause 3.19)

• Use analytical quality reagents.
• Apparatus for heating includes electric hotplate or Bunsen burner.

3. Lime Content Determination (Appendix A, Clause 7.2.1)

• Record weights and burette readings.
• Volume of EDTA titrated (V ml) used in calculation.

Key formula for Lime Content:

[ \text{Lime content (%)} = 100 \times \frac{Y \times X}{W} ]

Where:

• (Y) = volume of EDTA used for soil lime sample
• (X) = volume of EDTA used for soil sample
• (W) = weight of oven dry soil sample (g)

Summary Table for Apparatus:

flowchart LR
    A[Soil Sample] --> B[Sample Divider]
    B --> C[Weighing Bottle]
    C --> D[Heating Apparatus]
    D --> E[Titration with EDTA]
    E --> F[Calculate Lime Content]

This summarizes the apparatus and key formulas for lime content determination per IS 4332 Part 8.

IS 4332 Part 8 - Reagents & Key Formulas

Reagents (Clause 4.1 & 3.19)

• EDTA Solution: Dissolve 4 g of disodium dihydrogen EDTA in 1 litre distilled water.
• Use analytical grade reagents.
• Neutralize extracts with dilute ammonia until red litmus turns blue (Clause 6.2).

Key Formulas (Clause 7.1.1)

Notes:

• (X), (Y), and (Z) are volumes of EDTA for soil, soil-lime, and lime respectively.
• Sample weights (w) and volumes (V) must be accurately measured.
• The titration endpoint is indicated by color change with buffer and indicator.

flowchart LR
    A[Soil Sample] --> B[Prepare Extract]
    B --> C[Neutralize with Ammonia]
    C --> D[Titrate with EDTA]
    D --> E[Measure Volume V]
    E --> F[Calculate Lime Content]

This summarizes reagent prep and calculation essentials per IS 4332 Part 8.

IS 4332 Part 8: Preparation of Soil-Lime and Natural Soil Samples

Key Specifications (Clause 5.2)

• Samples are prepared by successive riffling using an appropriate sample divider.

Important Formulas (Clause 7.1.1)

For EDTA titration to determine lime content:

• Fine-grained soils or soil-lime samples:

  [ X \text{ or } Y = \frac{w \times 25}{V} ]

• Medium or coarse-grained soils or soil-lime samples:

  [ X \text{ or } Y = \frac{100 \times V}{w} \quad \text{(ml)} ]

Where:

• ( V ) = volume of EDTA solution used in titration (ml)
• ( w ) = weight of oven-dry prepared sample (g)

Lime Content Calculations

• Lime content of uncarbonated soil-lime sample as % of soil-lime weight:

  [ C_1 = 100 \times \frac{(Y - X)}{Z - X} ]

• Lime content as % of dry soil weight:

  [ C_2 = \frac{100 \times C_1}{100 + C_1} ]

Where:

• ( X ) = EDTA volume for soil
• ( Y ) = EDTA volume for soil-lime sample
• ( Z ) = EDTA volume for lime sample

This ensures representative sampling and accurate lime content determination for soil stabilization.

Analytical Procedure & Key Formulas from IS 4332 (Part 8) - 1969

Sample Preparation (Clause 5.3)

• Oven-dry sample at 105-110°C for 16-24 hours until weight change < 0.1%.
• Pulverize to pass through 425-micron IS Sieve.
• Subdivide by riffling using a sample divider with 6 mm opening.
• Sample weights:
  • Fine-grained soils: ~5 g
  • Medium-grained soils: ~25 g
  • Coarse-grained soils: ~50 g

Analytical Procedure (Clause 6.2)

• Add red litmus paper to flask with acid/ammonium chloride extract.
• Add dilute ammonia until litmus turns blue (if acid extract).
• Adjust volume to 250 ml with distilled water.
• After settling, pipette 50 ml clear supernatant.
• Add 2 ml buffer + 3-4 drops indicator.
• Titrate with EDTA until color change.

Key Calculations (Clause 7.1.1)

Notes:

• EDTA volume (V) is from titration.
• (X), (Y), (Z) represent volumes of EDTA for soil, soil-lime, and

Key Formulas & Specifications from IS 4332 Part 8 (1969) for Lime Content Calculation:

1. Volume of EDTA Solution Required (ml)

• For fine-grained soil or soil-lime samples:

[ X \text{ or } Y = \frac{25V}{W} ]

• For medium or coarse-grained soil or soil-lime samples:

[ X \text{ or } Y = \frac{100V}{W} ]

• For lime samples:

[ Z = \frac{50V}{W} ]

Where:

• (V) = volume of EDTA solution used in titration (ml)
• (W) = weight of oven-dry sample (g)
• (X) = EDTA volume for soil
• (Y) = EDTA volume for uncarbonated soil-lime
• (Z) = EDTA volume for lime sample

2. Lime Content Calculations

• Lime content of uncarbonated soil-lime sample as % of soil-lime weight:

[ C_1 = 100 \times \frac{(Y - X)}{(Z - X)} ]

• Lime content of uncarbonated soil-lime sample as % of dry soil weight:

[ C_2 = \frac{100 \times C_1}{100 + C_1} ]

3. Sample Divider Opening Widths (Clause 3.8)

4. Recommended Record Format (Appendix A)

• Sample details, weights, burette readings, and calculated volumes (X), (Y), (Z)
• Lime content (C_1) and (C_2) to be recorded clearly

flowchart TD
    A[Prepare oven-dry sample (W)] --> B[Titrate with EDTA (V)]
    B --> C{Soil Type?}
    C -->|Fine-Grained| D[Calculate X or Y = 

IS 4332 Part 8: Reporting of Results — Key Formulas & Specifications

Reporting Precision (Clause 7.2)

• Results (C1 or C2) shall be reported to the nearest 0.2%.

Key Formulas (Clause 7.1.1 & 7.2)

Sample Divider Openings (Clause 3.8)

Recommended Reporting Format (Appendix A)

• Record details such as sample reference, operator, date, sample description, weights, burette readings, volume of EDTA titrated, and calculated lime content.
• Use the proforma in Appendix A for consistent reporting.

flowchart TD
    A[Weigh Oven-Dry Sample (W)] --> B[EDTA Titration Volume (V)]
    B --> C[Calculate X or Y using formulas]
    C --> D[Calculate Lime Content C1 and C2]
    D --> E[Report Results to nearest 0.2%]

Summary: Use the formulas above for lime content calculation, record all observations as per

IS 4332 Part 8: Recommended Proforma for Recording Lime Content Results

Key Formulas (Clause 7.1.1)

• For fine-grained soils: [ X \text{ or } Y = \frac{w \times 25}{V} \quad \text{(ml)} ]

• For medium/coarse-grained soils: [ X \text{ or } Y = \frac{100 \times V}{w} \quad \text{(ml)} ]

• For lime samples: [ Z = \frac{V}{W} \quad \text{(ml)} ]

• Lime content of uncarbonated soil-lime sample (C1) (% weight of soil lime): [ C_1 = 100 \times \frac{(Y - X)}{Z - X} ]

• Lime content as % of dry soil weight (C2): [ C_2 = \frac{100 \times C_1}{100 + C_1} ]

Recommended Proforma (Appendix A)

Reporting (Clause 7.2)

• Report lime content to nearest 0.2%.

Sample Calculation Flow (Mermaid Diagram)

flowchart TD
    A[Weigh Oven-Dry Sample (W)] --> B[Perform EDTA Titration]
    B --> C[