Integral Waterproofing Compounds for Cement Mortar and Concrete -Specification

IS 2645 - Scope & Key Specifications Summary

IS 2645 covers the specification and testing of integral waterproofing compounds for cement mortars.

Key Points on Scope:

• Applies to waterproofing compounds added to cement mortars.
• Specifies sampling, testing, and certification requirements.
• Testing includes permeability to water of cement mortars with/without waterproofing compounds.

Important Tables & Clauses:

Testing Method Summary:

• Permeability Test: Measures water percolation through standard cylindrical mortar specimens with/without waterproofing compound.
• Specimens cured under specified conditions.

Rounding Off:

• Final test values rounded as per IS 2:1960 rules, retaining significant figures as per standard.

Visual: Sampling Procedure (Table 1)

flowchart TD
    A[Lot Size] -->|Up to 25| B[Sample 2 Containers]
    A -->|26 to 50| C[Sample 3 Containers]
    A -->|51 to 100| D[Sample 5 Containers]
    A -->|101 to 300| E[Sample 7 Containers]
    A -->|301 to 500| F[Sample 10 Containers]

For detailed test procedures and cement specifications, refer to the cited IS standards in Annex A.

IS 2645: References - Key Points & Specifications

• Annex A lists Indian Standards referenced in IS 2645, including cement specifications, test methods, and admixtures:

  IS No.	Title
  269:1989	Ordinary Portland Cement, 33 Grade
  455:1989	Portland Slag Cement
  650:1991	Standard Sand for Testing Cement
  1489 (Part 1 & 2):1991	Portland Pozzolana Cement (Fly ash & Calcined clay based)
  1727:1967	Test Methods for Pozzolanic Materials
  4031 (Parts 5 & 6):1988	Physical Tests for Hydraulic Cement (Setting times, compressive strength)
  6925:1973	Water Soluble Chlorides in Concrete
  8112:1989	Ordinary Portland Cement, 43 Grade
  12269:1987	Ordinary Portland Cement, 53 Grade

• Rounding Off (per IS 2:1960):

  • Final test values must be rounded to the same significant figures as specified.

• Certification Marking (Clause 6.2.1):

  • Use of Standard Mark follows Bureau of Indian Standards Act, 1986.

• Permeability Test Procedure (Annex B):

  • Mortar specimens prepared with specified water content to achieve 75 ± 5% flow.
  • Specimens compacted in layers with 10 blows per layer using 500g rammer.
  • Curing: 24h at 27 ± 2°C & 90% RH, then submerged for 20 days.
  • Water permeability tested by applying incremental pressures up to 0.2 N/mm².
  • Integral waterproofing compound is satisfactory if permeability reduces by ≥50%.

Summary Table: Key Test Parameters for Permeability

IS 2645 Key Requirements Summary

1. Rounding Off Values

• Follow IS 2:1960 for rounding numerical results.
• Retain the same number of significant digits as the specified value.

2. Modified Requirements

• Compressive strength and setting time requirements have been updated (refer to relevant clauses for exact values).

3. Standard Sand Gradation (Clause 3.1, Table B-3.1)

• Use natural, rounded siliceous sand conforming to IS 650, regraded as follows:

This gradation ensures consistent mortar quality for testing.

Note: For exact compressive strength and setting time values, consult the detailed clauses in IS 2645.

IS 2645 - Sampling of Waterproofing Compound

Key Specifications (Clauses 4.2.1 & 4.2.2)

• Sampling ensures complete representation of the lot.
• Samples are composite, made from individual samples taken from selected containers/bags.

Sampling Plan (Table 1)

Procedure:

• Select containers/bags randomly as per the lot size.
• Take individual samples from each selected container/bag.
• Mix these to form a composite sample for testing.

This ensures uniformity and reliability in testing waterproofing compounds as per IS 2645.

IS 2645: Test Methods for Cement Mortar Permeability

Key Specifications & Equipment (Annex B)

• Specimen: Cylindrical mortar, 100 mm diameter × 50 mm height.
• Test Setup:
  • Specimen container ring held between bottom plate and water cell.
  • Water cell: 100 mm diameter brass cylinder.
  • Plates & pipelines: Non-corroding metals or hard polythene.
  • Water pressure vessel: Galvanized steel, withstands test pressure.
  • Pressure regulation: Compressor → Pressure regulator → Pressure gauge → Water vessel.

Test Principle (Clause 3.1)

• Measure water percolation through mortar with/without waterproofing compound.
• Acceptance: Mortar with waterproofing must have permeability < 50% of plain mortar.

Rounding Off (Clause None)

• Follow IS 2:1960 for rounding test results.
• Retain significant figures as per specified values.

Summary Table: Permeability Test Setup

flowchart LR
    Compressor --> Pressure_Regulator --> Pressure_Gauge --> Water_Pressure_Vessel --> Water_Cell --> Specimen --> Water_Collection_Container

This setup ensures reliable measurement of water permeability through cement mortar as per IS 2645.

IS 2645: Marking and Packaging Key Points

Clause 6.1: Marking Requirements on Containers/Bags

Each container/bag must be legibly and indelibly marked with:

• Name of the material
• Manufacturer's name & address and/or trade-mark
• Brand name (if any)
• Date of manufacture (day/month/year)
• Batch No./Control unit No.
• Maximum chloride content (%)
• Manufacturer's recommended dosage
• Instructions for use and safety precautions
• Recommended storage conditions
• Date of expiry

Clause 6.2: BIS Certification Marking

• Containers may bear the BIS Standard Mark following the Bureau of Indian Standards Act, 1986.
• Licensing conditions for use of the Standard Mark are governed by BIS.

Sampling for Packaging (Clause 4.2.1)

Number of containers/bags to sample per lot is per Table I (not provided here), ensuring full lot representation.

Summary Table: Essential Marking Details

flowchart TD
  A[Container/Bag] --> B[Marking]
  B --> C[Material Name]
  B --> D[Manufacturer Info]
  B --> E[Brand Name]
  B --> F[Manufacture Date]
  B --> G[Batch No.]
  B --> H[Max Chloride Content]
  B --> I[Recommended Dosage]
  B --> J[Instructions & Safety]
  B --> K[Storage Conditions]
  B --> L[Expiry Date]
  B --> M[BIS Standard Mark (optional)]

Note: For detailed sampling sizes, refer to Table I of IS 2645. For BIS Mark licensing, contact BIS directly.

IS 2645 Annex A: List of Referred Indian Standards

This annex lists key IS codes referenced for cement and concrete testing and specifications:

Key Notes:

• These standards cover cement types, physical and chemical tests, and mortar testing procedures.
• For example, IS 4031 Part 5 & 6 detail methods for determining initial/final setting times and compressive strength.
• IS 650 defines the standard sand used in cement testing.
• IS 6925 is essential for chloride content testing to assess durability.

Typical Test Procedure (Water Permeability of Cement Mortar):

• Prepare standard cylindrical specimens with/without waterproofing compound.
• Cure under specified conditions.
• Measure water percolation to determine permeability.

flowchart TD
    A[Prepare Cement Mortar Specimen] --> B[Cure Specimen]
    B --> C[Apply Water Pressure]
    C --> D[Measure Water Percolation]
    D --> E[Calculate Permeability]

For detailed test methods and specifications, refer to the respective IS codes listed above.

IS 2645: Test Method for Determination of Permeability to Water

Key Specifications & Setup (Clause 2.1, Annex B)

• Specimen size: Cylinder, 100 mm diameter × 50 mm height.
• Unit components: Specimen container ring, bottom plate, water cell (brass, 100 mm diameter).
• Pressure system: Compressor → pressure regulator → water pressure vessel (galvanized steel) → specimen unit.
• Materials: Non-corroding metals for water cell, plates, and pipelines (brass or hard polythene).
• Water collection: Water percolating through specimen collected in a container.

Test Requirements (Clause 3.1)

• Permeability of specimen with waterproofing compound ≤ 50% of permeability of specimen without compound.

Procedure Overview

1. Prepare standard mortar specimens with/without waterproofing compound.
2. Mount specimen in permeability unit.
3. Apply hydraulic head via water pressure vessel.
4. Measure water percolation volume over time.

Formula for Permeability (conceptual)

[ k = \frac{Q \times L}{A \times H \times t} ]

Where:

• (k) = coefficient of permeability (m/s)
• (Q) = volume of water passed (m³)
• (L) = specimen thickness (m)
• (A) = cross-sectional area (m²)
• (H) = hydraulic head (m)
• (t) = time (s)

Summary Table: Equipment Dimensions

flowchart LR
    Compressor --> PressureRegulator --> WaterPressureVessel --> WaterCell --> Specimen --> WaterCollectionContainer

Note: Use non-corroding materials to avoid rust affecting permeability results. Test duration may extend over several days.

IS 2645: Committee Composition & Key Specifications

Committee Composition (Annex C Summary)

• Committee: Cement and Concrete Sectional Committee, CED 2
• Members: Experts from:
  • Cement Corporations (e.g., Cement Corporation of India)
  • Research Institutes (CBRI, CRRI, CSIR Labs)
  • Government Departments (CPWD, Central Water Commission)
  • Industry Representatives (Larsen & Toubro, Gammon India)
  • Academia (IITs, Indian Institute of Science)
  • Professional Bodies (Indian Concrete Institute, Builders Association)
• Chairman: Dr. H. C. Visvesvaraya
• Secretary: Shri G. R. Bharitkar

Key Tables & Specifications

Specimen Compaction Appar