Specification for granulated slag for the manufacture of Portland slag cement

IS 12089: Scope Summary

• Scope: Specifies requirements for Portland slag cement, including physical, chemical, and mechanical properties.
• Moisture Content Calculation (Clause 3.1):

[ \text{Moisture content, %} = 100 \times \frac{(W_1 + W_2 + W_3) - (W_4 + W_5 + W_6)}{(W_1 + W_2 + W_3)} ]

Where:

• (W_1, W_2, W_3) = weights before drying

• (W_4, W_5, W_6) = weights after drying

• Units: SI units are mandated (e.g., length in meters, mass in kilograms, pressure in pascals).

• Key Physical Quantities:

This standard governs testing, quality control, and ensures uniformity in Portland slag cement production and use.

flowchart LR
    A[Portland Slag Cement] --> B[Physical Properties]
    A --> C[Chemical Properties]
    A --> D[Mechanical Properties]
    B --> E[Moisture Content Calculation]
    E --> F[Weights before and after drying]
    C --> G[Chemical Composition Limits]
    D --> H[Strength Requirements]

IS 12089 - Definition & Key Specifications

Definition (Clause 2.0)

• The standard defines terms related to Portland Slag Cement (PSC).
• It specifies rules for rounding off numerical values.
• It covers specifications for PSC (third revision).

Moisture Content Calculation (Clause 3.1)

Moisture content (%) of granulated slag is calculated as:

[ \text{Moisture content} = 100 \times \frac{(W_1 + W_2 + W_3) - (W_4 + W_5 + W_6)}{(W_1 + W_2 + W_3)} ]

Where:

• (W_1, W_2, W_3) = Initial weights of samples
• (W_4, W_5, W_6) = Weights after drying

Units (SI Units)

• Length: metre (m)
• Mass: kilogram (kg)
• Time: second (s)
• Force: newton (N) = 1 kg·m/s²
• Pressure/Stress: pascal (Pa) = 1 N/m²

Summary

• IS 12089 standardizes PSC definitions, moisture content calculation, and unit usage.
• Moisture content formula is essential for quality control of slag.
• SI units ensure consistency in measurements.

flowchart LR
    A[Granulated Slag Sample] --> B{Measure weights}
    B --> C[W1, W2, W3 (Initial)]
    B --> D[W4, W5, W6 (After drying)]
    C & D --> E[Calculate Moisture Content %]
    E --> F[Quality Control for PSC]

For detailed tables and further specifications, refer to the full IS 12089 document.

Key Formulas & Specifications for Composition (IS 12089: Clause 3)

1. Chemical Composition Requirements (Clause 3.2)

2. Major Oxide Composition Criteria (Clause 3.3)

Granulated slag must satisfy at least one of the following:

• ( CaO + MgO + \frac{1}{3} Al_2O_3 > 1.0 )
• ( SiO_2 + \frac{2}{3} Al_2O_3 > 1.0 )
• ( CaO + MgO + Al_2O_3 > 1.0 )

Oxide percentages are determined per IS:4032-1985.

Summary Table of Oxide Ratios

Notes:

• These chemical limits ensure the slag's suitability for cementitious properties.
• Testing methods for oxides follow IS 4032.
• Moisture content and glass content calculations are also important but covered separately.

If you want, I can provide formulas for moisture or glass content next.

IS 12089: Sampling and Sample Preparation Key Points

Sampling (Clause 4.2)

• Number of points: Minimum 5 points from wagon/truck
• Sample weight: ~1 kg per sample

Sample Preparation for Microscopy (Clause 3.2, A-3.2)

• Use ~1 mg powdered slag on a rectangular glass slide.
• Cover with smaller cover glass.
• Add 1-2 drops of bromoform or suitable immersion liquid.
• Gently move slide and cover to disperse evenly.
• Examine under polarizing microscope at 200x magnification.
• Count ~1500 grains (N1).
• Under crossed nicols, count anisotropic and opaque grains (N2).

Moisture Content Determination (Clause 4.5, Appendix B)

• Draw 3 samples (~1 kg each) from remaining slag.
• Weigh moist samples: W1, W2, W3 (nearest 1 g).
• Spread samples in trays (slag layer ≤ 3 cm thick).
• Dry at 110 ± 5°C until constant weight.
• Record dry weights: W4, W5, W6.

Moisture Content Calculation (B-3)

[ \text{Moisture %} = \frac{W_{\text{moist}} - W_{\text{dry}}}{W_{\text{moist}}} \times 100 ]

Where:

• ( W_{\text{moist}} ) = initial moist sample weight
• ( W_{\text{dry}} ) = final dry sample weight

flowchart TD
    A[Collect 5 samples (~1 kg each)] --> B[Prepare powdered sample (~1 mg)]
    B --> C[Add immersion liquid + cover glass]
    C --> D[Microscopic examination at 200x]
    D --> E[Count grains N1 and N2]
    A --> F[Draw 3 samples (~1 kg each) for moisture]
    F --> G[Weigh moist samples W1, W2, W3]
    G --> H[Dry at 110 ± 5°C until constant weight]
    H --> I[Record dry weights W4, W5, W6]
    I --> J[Calculate moisture content]

This concise summary covers sampling, microscopic preparation

IS 12089: Supply and Test Requirements Summary

1. Supply Agreement (Clause 5.1)

• The supplier and purchaser must agree on:
  • The manner of supplying granulated slag.
  • Whether moisture content determination is required.

2. Test Results (Clause 5.2.1)

• Test results for the consignment shall be supplied if requested by the purchaser.

3. Moisture Content Calculation (Clause 3.1, Table B-3)

[ \text{Moisture content, %} = 100 \times \frac{(W_1 + W_2 + W_3) - (W_4 + W_5 + W_6)}{(W_1 + W_2 + W_3)} ]

• (W_1, W_2, W_3): Weights before drying.
• (W_4, W_5, W_6): Weights after drying.

4. Rounding Off (Clause 0.4)

• Final test values must be rounded off per IS 2-1960.
• Retain the same number of significant figures as specified values.

Units & Symbols (SI Units)

This ensures clarity in supply, testing, and reporting of granulated slag quality per IS 12089.

IS 12089 Appendix A: Method for Determination of Glass Content of Granulated Slag

Key Specifications:

• Minimum glass content: 85% (Clause 3.4.1)
• Sample preparation: ~1 mg powdered slag on glass slide, covered with cover glass.
• Immersion liquid: Bromoform or suitable liquid.
• Microscope: Polarizing microscope, transmitted light, 200x magnification.
• Grain counting:
  • Count total grains (N1) ~1500 grains.
  • Under crossed nicols, count anisotropic and opaque grains (N2).

Calculation Formula (Clause A.4.1):

[ \text{Glass content, %} = 100 \times \frac{N_1 - N_2}{N_1} ]

• N1: Total grains counted.
• N2: Anisotropic and opaque grains counted under crossed nicols.

Summary:

• Glass content = Percentage of isotropic grains (glassy phase).
• Use mechanical stage and cross-wire for systematic counting.
• Ensures slag meets minimum glass content for hydraulic performance.

flowchart TD
    A[Prepare powdered slag on slide] --> B[Add bromoform and cover glass]
    B --> C[Examine under polarizing microscope (200x)]
    C --> D[Count total grains (N1)]
    D --> E[Crossed nicols examination]
    E --> F[Count anisotropic grains (N2)]
    F --> G[Calculate glass content: 100*(N1-N2)/N1]

This method ensures reliable quantification of glassy phase in granulated slag per IS 12089.

IS 12089 Appendix B: Moisture Content Determination of Granulated Slag

Key Specifications:

• Sample size: 3 samples, ~1 kg each.
• Layer thickness: ≤ 3 cm in metallic trays.
• Drying temperature: 110 ± 5°C.
• Drying method: Oven or infra-red moisture determinator.
• Drying duration: Until constant mass (periodic weighing).

Procedure Summary:

1. Weigh moist samples: ( W_1, W_2, W_3 ) (nearest 1 g).
2. Dry samples in oven at 110 ± 5°C until constant weight.
3. Record dry weights: ( W_4, W_5, W_6 ).

Moisture Content Calculation:

[ \text{Moisture Content (%)} = \frac{W_i - W_f}{W_i} \times 100 ]

Where:

Calculate for each sample, then take the average moisture content.

Summary Table:

flowchart TD
    A[Collect 3 samples (~1kg each)] --> B[Weigh moist samples (W1, W2, W3)]
    B --> C[Spread in trays (≤3cm thick)]
    C --> D[Dry in oven at 110±5°C]
    D --> E[Weigh samples periodically]
    E --> F{Mass constant?}
    F -- No --> D
    F -- Yes --> G[Record dry weights (W4, W5, W6)]
    G --> H[Calculate moisture content]

This method ensures accurate moisture content determination as per IS 12089 Appendix B.