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IS 16474:2017 is the Indian Standard (BIS) for cement based polymer modified repair mortar/coating for waterproofing - specification. This standard specifies requirements for pre-packed, cement-based, polymer-modified mortars and coatings used for waterproofing and repairing concrete. It classifies products into three types based on application (general repair, high-strength repair, coating) and outlines performance criteria like strength, adhesion, and water permeability.
Specifies requirements for cement-based polymer modified repair mortars/coatings primarily for waterproofing and repair applications.
Overview
Status
Current
Usage level
Specialized
Domain
Materials Science — Waterproofing and Damp Proofing
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
Practical Notes
! The standard covers only pre-packed, factory-made products, not site-mixed polymer, cement, and sand.
! Proper surface preparation, including pre-wetting to a saturated surface-dry (SSD) condition, is critical to achieve the specified bond strength.
! Select the correct material type for the intended application: Type 1 for general repair, Type 2 for high-strength structural repair, and Type 3 for thin-section waterproofing coatings.
EN 1504-2:2004CEN, European Committee for Standardization
HighCurrent
Products and systems for the protection and repair of concrete structures - Definitions, requirements, quality control and evaluation of conformity - Part 2: Surface protection systems for concrete
Covers polymer-cement coatings for moisture control and increasing physical resistance, aligning with IS 16474's Type I coating.
EN 1504-3:2005CEN, European Committee for Standardization
HighCurrent
Products and systems for the protection and repair of concrete structures - Definitions, requirements, quality control and evaluation of conformity - Part 3: Structural and non-structural repair
Specifies requirements for polymer-modified mortars for concrete repair, aligning with IS 16474's Type II mortar.
ASTM C928 / C928M - 20ASTM International, USA
MediumCurrent
Standard Specification for Packaged, Dry, Rapid-Hardening Cementitious Materials for Concrete Repairs
Covers pre-packaged cementitious repair mortars, but with a specific focus on rapid-hardening properties.
BS EN 1504-7:2006BSI, British Standards Institution
MediumCurrent
Products and systems for the protection and repair of concrete structures. Reinforcement corrosion protection
Specifies active and barrier coatings for rebar; some polymer-cement mortars from IS 16474 could fulfill this function.
Key Differences
≠IS 16474 combines waterproofing coatings (Type I) and repair mortars (Type II) into a single standard, whereas the European EN 1504 series separates them into distinct parts (EN 1504-2 for coatings, EN 1504-3 for mortars).
≠The water permeability test in IS 16474 is based on resisting a hydrostatic pressure head (5 bar), while EN 1504-2 uses a capillary absorption test (Karsten tube) to determine the rate of water absorption (w-value).
≠EN 1504-3 classifies repair mortars into four classes (R1, R2, R3, R4) based on a hierarchy of performance (e.g., compressive strength, bond strength), offering more granularity than the single 'Type II' mortar classification in IS 16474.
≠EN 1504 standards are linked to a mandatory CE marking regulatory framework in Europe, requiring a Declaration of Performance (DoP) and extensive factory production control, a system not mirrored in the IS code.
Key Similarities
≈Both IS 16474 and the EN 1504 series specify minimum pull-off bond strength to a concrete substrate as a critical performance requirement for both coatings and mortars.
≈The fundamental material composition is the same: a factory-batched system of cement, graded aggregates, and polymer modifiers designed to improve performance over plain cement mortars.
≈Both Indian and European standards require minimum levels of compressive and flexural strength for products intended for use as repair mortars (Type II in IS 16474; R-classes in EN 1504-3).
≈Both sets of standards recognize the importance of limiting the ingress of deleterious substances, specifying performance requirements related to water and/or chloride ion permeability.
Parameter Comparison
Parameter
IS Value
International
Source
Pull-off Adhesion Strength (Mortar)
≥ 1.0 N/mm² (for Type II)
≥ 1.5 N/mm² (Class R2); ≥ 2.0 N/mm² (Class R3/R4)
EN 1504-3:2005
Compressive Strength at 28 days (Mortar)
≥ 35 N/mm² (for Type II)
≥ 25 N/mm² (Class R3); ≥ 45 N/mm² (Class R4)
EN 1504-3:2005
Water Permeability
No leakage under 5 bar (0.5 MPa) pressure
w < 0.1 kg·m⁻²·h⁻⁰.⁵ (by capillary absorption)
EN 1504-2:2004
Chloride Ion Permeability
< 1000 Coulombs (RCPT as per ASTM C1202)
Requirement is for Chloride Ion Content ≤ 0.05% by mass; permeability is a separate performance test, not a single value.
EN 1504-3:2005
Pull-off Adhesion Strength (Coating)
≥ 1.0 N/mm² (for Type I)
≥ 1.0 N/mm² (for systems without traffic)
EN 1504-2:2004
Water Vapour Permeability (Breathability)
Not specified
Classified as Class I (Impermeable), II (Medium), or III (Permeable/Breathable) based on Sd value.
EN 1504-2:2004
Flexural Strength at 28 days (Mortar)
≥ 7 N/mm²
Not a mandatory requirement for all classes in EN 1504-3, but typically declared by manufacturers.
EN 1504-3:2005
⚠ Verify details from original standards before use
Key Values6
Quick Reference Values
Min Compressive Strength (28d) for Type 125 MPa
Min Compressive Strength (28d) for Type 240 MPa
Min Bond Strength (28d) for Type 1 & 21.5 MPa
Max Water Permeability (Depth)10 mm
Min Pot Life at 27°C30 min
Min Water Vapour Permeability300 g/m²/24h
Tables & Referenced Sections
Key Tables
Table 1 - Requirements for Cement Based Polymer Modified Repair Mortar/Coating for Waterproofing
Key Clauses
Clause 5 - Types
Clause 6 - Requirements
Clause 8 - Tests
Annex A - Method for Determination of Water Permeability