Method of test for determination of water transmission rate by capillary action through natural building stones

IS 4121 - Scope Summary & Key Specifications

• Scope: Covers methods to test water transmission rate by capillary action in waterproofing adhesives.
• Water Transmission Rate: Expressed as water loss (grams) over 48 hours after stabilization (Clause 6.3).
• Test Sensitivity: Use a balance sensitive to 0.01 g for weighing (Clause 4.3).
• Test Setup: Includes waterproofing adhesive, distilled water, and a covered glass vessel (Fig. 1).
• Units: All dimensions in millimeters.
• Result Reporting: Round off final values per IS 2-1960.

Key Formula:

[ \text{Water Transmission Rate} = \frac{\text{Loss in water (g)}}{48 \text{ hours}} ]

Related IS Standards (Appendix A):

This standard aligns with international practices and ensures reliable waterproofing adhesive evaluation by quantifying water loss via capillary action.

IS 4121: Sampling and Sample Selection for Stone

Key Specifications:

• Sample Selection (Clauses 2.1 - 2.4):

  • Samples must represent the true average of the stone type/grade.
  • For perceptible quality variations, select multiple samples to cover the property range.

• Sample Weight & Condition (Clause 2.2):

  • Each sample: minimum 25 kg of unweathered stone.
  • Select from different strata with distinct colour, texture, or structure.
  • Exclude damaged pieces (blasting, wedges, heating).

• Field Stone & Boulders (Clause 2.3):

  • Conduct detailed deposit inspection.
  • Record stone types and conditions.
  • Select separate samples for each class of stone suitable for construction.

Summary Table of Sampling

flowchart LR
    A[Inspect Quarry Face/Deposit] --> B{Variation in Stone?}
    B -- Yes --> C[Select Multiple Samples from Different Strata]
    B -- No --> D[Select Single Representative Sample]
    C & D --> E[Ensure ≥ 25 kg Unweathered Stone]
    E --> F[Exclude Damaged Pieces]
    F --> G[Samples Ready for Testing]

This ensures representative sampling for reliable testing and quality assessment.

IS 4121: Key Specifications & Test Specimens

Test Specimen Dimensions (Clause 3.1)

• Shape: Square prism
• Cross-section: 5 cm × 5 cm
• Length: 6 cm
• Surface: Square-cut or finely tooled on all faces
• Orientation: 5×5 cm dimension along planes of stratification

Sampling (Clause 2.4)

• Select multiple samples if rock quality varies perceptibly to cover property range.

Weighing (Clause 4.3)

• Use a balance sensitive to 0.01 g for specimen weighing.

Test Setup (Clause 5.1)

• Specimen placed centrally in a glass vessel.
• Vessel filled with distilled water to ~3/4 depth (1.5 cm).
• Cover plate with central hole placed over vessel.
• Specimen part above cover coated with wax to prevent evaporation.

Summary Table: Test Specimen Dimensions

flowchart TD
    A[Test Specimen] -->|5x5 cm cross-section| B[Square Prism]
    B -->|Length 6 cm| C[Specimen]
    C --> D[Placed in Glass Vessel]
    D --> E[Distilled Water 1.5 cm depth]
    E --> F[Cover Plate with Hole]
    F --> G[Wax coating on exposed specimen]

This ensures consistent specimen preparation and reliable test results per IS 4121.

IS 4121: Apparatus Specifications for Water Transmission Test

• Glass Vessel:

  • Diameter: 100 mm (10 cm)
  • Depth: 20 mm (2 cm)
  • Material: Shallow glass vessel with ground glass flange

• Cover Plate:

  • Central square hole: 52.5 mm x 52.5 mm
  • Ground glass flange to fit vessel flange
  • Flanges greased to ensure leak-proof joint

• Balance:

  • Sensitivity: 0.01 g

Test Setup (Fig. 1 Summary)

• Specimen placed centrally in vessel
• Vessel filled with distilled water to ~15 mm (3/4 depth)
• Cover placed so specimen protrudes through hole
• Wax coating on specimen sides above cover to prevent evaporation

Key Formula for Water Transmission Rate

Water transmission rate (g/48h) = Loss in water weight (g) after 48 hours once constant

Important Notes

• Use distilled water only
• Ensure airtight seal via greased ground glass flanges
• Weigh water loss using sensitive balance after 48 hours for capillary action rate

flowchart LR
    A[Glass Vessel (10cm dia, 2cm depth)] --> B[Fill with distilled water (1.5cm depth)]
    B --> C[Place specimen centrally]
    C --> D[Cover with plate (5.25cm hole)]
    D --> E[Wax coat specimen sides above cover]
    E --> F[Measure water loss after 48 hrs on 0.01g balance]

This setup ensures accurate measurement of water transmission by capillary action per IS 4121.

IS 4121 — Test Procedure for Water Transmission Rate through Natural Stones

Key Specifications:

• Balance Sensitivity: Use a balance sensitive to 0.01 g for weighing (Clause 4.3).
• Materials: Waterproofing adhesive, distilled water, glass vessel with cover.
• Dimensions: All dimensions in millimeters (see Fig. 1 typical arrangement).

Test Procedure Highlights (Clause 5):

• Initial Weighing: Record initial weight of the specimen.
• Repeated Weighing: Weigh specimen every 24 hours to measure water loss due to evaporation (Clause 5.5).
• Rounding Off: Final values must be rounded off per IS 2:1960 rules.

Reporting (Clause 6):

• Report the rate of water transmission by capillary action based on weight loss over time.

Rounding Off Rules (IS 2:1960) Summary:

flowchart TD
    A[Prepare Specimen] --> B[Weigh Initial Specimen]
    B --> C[Place in Glass Vessel]
    C --> D[Wait 24 Hours]
    D --> E[Weigh Specimen Again]
    E --> F[Calculate Weight Loss]
    F --> G[Repeat Weighing Every 24 Hours]
    G --> H[Determine Water Transmission Rate]

This procedure ensures accurate measurement of water transmission by capillary action through natural stones.

IS 4121 - Report of Test Results: Key Points

• Weighing Sensitivity: Use a balance sensitive to 0.01 g (Clause 4.3).
• Weighing Frequency: Repeat weighing every 24 hours to record water loss due to evaporation (Clause 5.5).
• Rate of Water Loss: Report the period and rate of water loss until it becomes constant (Clause 6.2).
• Rounding Off: Final values must be rounded off as per IS 2-1960 guidelines (Clause 6, Note 0.5).

Typical Test Setup (Fig. 1)

• Use distilled water in a glass vessel with cover.
• Measure water loss through the specimen surface.
• All dimensions in millimeters.

Formula for Rate of Water Loss

[ \text{Rate of water loss} = \frac{\Delta W}{\Delta t} ]

Where:

• (\Delta W) = change in weight (g) over time interval (\Delta t) (hours)

Summary Table for Reporting

flowchart LR
    A[Start Test] --> B[Fill vessel with distilled water]
    B --> C[Place specimen on vessel]
    C --> D[Weigh specimen + vessel (W1)]
    D --> E[Wait 24 hours]
    E --> F[Weigh specimen + vessel (W2)]
    F --> G[Calculate ΔW = W1 - W2]
    G --> H[Calculate rate ΔW/24]
    H --> I{Rate constant?}
    I -- No --> E
    I -- Yes --> J[Report results]

This ensures consistent, accurate reporting of water transmission test results per IS 4121.

Related Indian Standards on Natural Building Stones (IS 4121 - Appendix A)

Key Specification from IS 4121 (Clause 6.3)

• Water transmission rate by capillary action is expressed as loss in water (grams) over 48 hours after the rate stabilizes.

Important Notes:

• These standards guide testing for strength, durability, and water absorption critical for natural building stones.
• Use IS 1124 for water absorption tests before applying IS 4121 capillary water transmission tests.
• Specific gravity and porosity (IS 1122) influence stone durability and water movement.

Formula for Water Transmission Rate (Capillary Action):

[ \text{Water Transmission Rate} = \frac{\text{Loss in water (g) after 48 hrs}}{\text{Surface area (cm}^2)} ]

This suite of IS codes ensures comprehensive evaluation of natural stones for construction suitability.