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IS 2645:2003 is the Indian Standard (BIS) for integral cement waterproofing compounds - specification. This standard lays down the specification and testing methods for integral cement waterproofing compounds added to cement mortar and concrete. It ensures that the admixture effectively reduces water permeability without unacceptably degrading the concrete's setting time and compressive strength.
Specifies requirements for integral cement waterproofing compounds to be added to cement or concrete mixes to reduce permeability.
Overview
Status
Current
Usage level
Frequently Used
Domain
Materials Science — Admixtures and Chemical Products for Concrete
Admixtures for concrete, mortar and grout - Part 2: Concrete admixtures - Definitions, requirements, conformity, marking and labelling
Defines a specific category for 'Water resisting admixtures' with performance criteria for permeability.
ASTM C494 / C494M-19ASTM International (US)
MediumCurrent
Standard Specification for Chemical Admixtures for Concrete
Covers general chemical admixtures; permeability reduction is an implicit benefit of water-reducing types (Type A, D) but not a primary classification.
JIS A 6204:2015JSA (Japan)
MediumCurrent
Chemical admixtures for concrete
Specifies requirements for various chemical admixtures, where impermeability is achieved through water reduction, similar to ASTM C494.
BS 5075-1:1982BSI (UK)
LowWithdrawn
Concrete admixtures. Specification for accelerating admixtures, retarding admixtures and water reducing admixtures
Older British standard that covered water-reducing admixtures but is now superseded by the more direct European equivalent.
Key Differences
≠The primary performance test for permeability in IS 2645 is based on an absolute water penetration depth (max 25% of thickness) in a mortar specimen. In contrast, EN 934-2 uses a comparative test on a concrete specimen, requiring the penetration depth to be ≤50% of a control mix, and adds a capillary absorption test.
≠IS 2645 provides a single classification 'Integral Cement Waterproofing Compound'. EN 934-2 has a specific but distinct classification 'Water resisting admixture'. ASTM C494 has no direct equivalent, with such products typically falling under 'Water-Reducing' admixture types.
≠Compressive strength requirements differ. IS 2645 requires ≥80% of control strength for powders and ≥100% for liquids at 28 days. EN 934-2 requires ≥80% for all water resisting admixtures, while ASTM C494 (for water-reducers) demands higher strengths, typically ≥110% of control.
≠The permeability test conditions are different. IS 2645 specifies a water pressure of 1.4 N/mm² for 24 hours, whereas the EN 934-2 test uses a lower pressure of 0.5 N/mm² (500 kPa) for a longer duration of 72 hours.
Key Similarities
≈All related standards share the fundamental purpose of specifying admixtures that reduce the water permeability of concrete or mortar when added during mixing.
≈All standards mandate that the admixture must not adversely affect the compressive strength of the concrete/mortar, specifying minimum strength levels relative to a control mix.
≈There is a common requirement across all standards to control the admixture's effect on the setting time of the cement, with defined limits relative to a control sample.
≈All standards place stringent limits on the chloride content of the admixtures, especially for use in reinforced or prestressed concrete, to mitigate the risk of steel corrosion.
Parameter Comparison
Parameter
IS Value
International
Source
Permeability Test Specimen
Mortar prism (1:3 Cement:Sand)
Concrete specimen
EN 934-2
Permeability Test Pressure
1.4 N/mm² (approx. 14 bar)
0.5 N/mm² (5 bar)
EN 934-2
Permeability Test Duration
24 hours
72 hours
EN 934-2
Permeability Acceptance Criteria
Absolute: Average penetration depth ≤ 25% of specimen thickness.
Relative: Penetration depth in test mix ≤ 50% of control mix. Also includes a capillary absorption test.
EN 934-2
28-Day Compressive Strength (vs Control)
≥80% for powder; ≥100% for liquid
≥80%
EN 934-2
Initial Setting Time (vs Control)
Within ±30 minutes of control
Test mix setting time ≤ 150% of control mix setting time
EN 934-2
Air Content in Fresh Concrete
Not specified as a primary requirement.
≤ 2% by volume above control mix
EN 934-2
⚠ Verify details from original standards before use
Key Values5
Quick Reference Values
minimum initial setting time30 minutes
maximum final setting time600 minutes
minimum compressive strength85% of plain control mix at 3, 7 and 28 days
maximum water permeability50% of plain control mix
maximum chloride contentAs specified (often 0.2% max for RCC) to prevent corrosion
Tables & Referenced Sections
Key Tables
Table 1 - Physical Requirements for Integral Cement Waterproofing Compounds