IS 2645:1994 is the Indian Standard (BIS) for integral cement waterproofing compounds - specification. This standard specifies the requirements, sampling, and testing methods for integral cement waterproofing compounds. These compounds are added to cement mortar and concrete during mixing to minimize water permeability.
Specified requirements for integral cement waterproofing compounds to be added to cement or concrete mixes to reduce permeability.
Overview
- Status
- Superseded — superseded by IS 2645:2003
- Usage level
- Frequently Used
- Domain
- Materials Science — Admixtures and Chemical Products for Concrete
- Type
- Specification
Also on InfraLens for IS 2645
Practical Notes
! Always verify the chloride content of the waterproofing compound before use in reinforced concrete to prevent rebar corrosion.
! For maximum effectiveness, the compound must be uniformly dispersed in the mix; mixing it first with the gauging water is standard best practice.
! Waterproofing admixtures are not a substitute for poor concrete practices; a proper water-cement ratio and adequate compaction remain essential for watertightness.
Frequently referenced clauses
cementwaterproofing compoundsconcretemortaradmixtures
International Equivalents
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International Comparison — Coming Soon
We're adding equivalent international standards for this code.
Key Values5
Quick Reference Values
Initial setting time>= 30 minutes
Final setting time<= 600 minutes
Compressive strength of treated mortar (3 and 7 days)>= 85% of untreated control mix
Maximum chloride content for reinforced concrete<= 0.2% by mass of admixture
Permeability reductionMust significantly reduce water absorption compared to untreated control mix
Tables & Referenced Sections
Key Tables
Table 1 - Physical Requirements for Integral Waterproofing Compounds
Key Clauses
Clause 4 - Physical Requirements
Clause 5 - Packing and Marking (Declaration of chloride content)
Clause 7 - Sampling and Criteria for Conformity
Annex B - Determination of Setting Time
Annex C - Determination of Compressive Strength
Annex D - Determination of Water Permeability
Frequently Asked Questions3
What is the primary function of integral waterproofing compounds?+
They act as pore fillers or water-repellents to reduce the water permeability of concrete or cement mortar.
Can waterproofing compounds negatively impact the setting time of concrete?+
They may alter it slightly, but the standard mandates that the initial setting time must remain above 30 minutes and the final setting time below 600 minutes.
Does adding these compounds reduce the strength of the concrete?+
It should not cause significant strength reduction. The standard requires the compressive strength to be at least 85% of the untreated control mix.
QA/QC Inspection Templates
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QA/QC templates coming soon for this code.