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IS 12262:1987 is the Indian Standard (BIS) for use of superplasticizing admixtures in concrete - guidelines. This standard provides guidelines for using superplasticizing admixtures in concrete to produce high workability (flowing) concrete or high-strength concrete with reduced water content. It specifies the physical and chemical requirements for these admixtures, along with guidance on trials, dosage, and precautions during use.
Provides guidelines for the proper use of superplasticizing admixtures in concrete to improve workability or reduce water content.
Overview
Status
Current
Usage level
Specialized
Domain
Materials Science — Precast and Prefabricated Concrete
! Always conduct site trials with actual project materials (cement, aggregates) to determine the optimum dosage and to check for adverse effects like segregation or excessive setting time changes.
! The slump-enhancing effect is temporary. Ensure concrete is transported, placed, and compacted within the window of increased workability, which can be as short as 30-60 minutes.
! Overdosing can lead to severe segregation and retardation. Admixtures should be dispensed using a calibrated dispenser for accuracy.
Consolidated list per BIS. For the text of each amendment, refer to the BIS portal link above.
concreteadmixturessuperplasticizercement
International Equivalents
Similar International Standards
ACI 212.4R-19American Concrete Institute (ACI), USA
HighCurrent
Guide for the Use of High-Range Water-Reducing Admixtures (Superplasticizers) in Concrete
Directly equivalent in purpose as a 'guideline for use' document, covering selection, effects, and application.
ASTM C494 / C494M - 19ASTM International, USA
MediumCurrent
Standard Specification for Chemical Admixtures for Concrete
Defines performance requirements for admixtures (Type F/G), which IS 12262 provides usage guidance for.
EN 934-2:2009+A1:2012European Committee for Standardization (CEN), Europe
MediumCurrent
Admixtures for concrete, mortar and grout - Part 2: Concrete admixtures - Definitions, requirements, conformity, marking and labelling
Provides the core European specification for superplasticizers, setting performance criteria rather than usage guidelines.
JIS A 6204:2016Japanese Industrial Standards (JIS), Japan
MediumCurrent
Chemical admixtures for concrete
A specification standard defining types and quality for admixtures, including high-range water reducers (superplasticizers).
Key Differences
≠The Indian standard IS 12262:1987 is a 'guideline for use', whereas primary international standards like ASTM C494 and EN 934-2 are 'material specifications' that set mandatory performance requirements.
≠IS 12262 is based on older chemical classifications (SNF, SMF, Lignosulfonates) and predates the widespread use of Polycarboxylate Ethers (PCEs), which dominate the modern market and are covered in current international standards.
≠International standards (ASTM C494, EN 934-2) classify admixtures based on performance (e.g., Type F for water reduction, Type G for water reduction and retardation), while IS 12262 focuses more on the chemical nature of the admixture.
≠The Indian standard is significantly older (1987) and less detailed regarding contemporary issues like admixture compatibility, extended slump retention, and interaction with supplementary cementitious materials compared to modern guides like ACI 212.4R.
Key Similarities
≈All standards acknowledge the fundamental purpose of superplasticizers: to either produce high-flow concrete without adding water or to significantly reduce the water content for a given workability, thereby increasing strength and durability.
≈Both IS 12262 and international guidelines like ACI 212.4R describe the same primary mechanism of action: dispersion of cement particles through electrostatic repulsion and/or steric hindrance.
≈All related standards emphasize the critical need for conducting trial mixes with job-specific materials (cement, aggregates) to verify performance, determine optimal dosage, and check for any adverse effects like segregation or excessive setting time changes.
≈The potential for rapid slump loss is a common concern addressed in both the Indian standard and its international counterparts, highlighting it as a key parameter to monitor for site logistics.
Parameter Comparison
Parameter
IS Value
International
Source
Minimum Water Reduction
≥ 20% (as per IS 9103, referenced by IS 12262)
≥ 12%
ASTM C494 (Type F)
Compressive Strength (3 Days vs Control)
≥ 140% (as per IS 9103)
≥ 125%
ASTM C494 (Type F)
Compressive Strength (28 Days vs Control)
≥ 115% (as per IS 9103)
≥ 110%
ASTM C494 (Type F)
Initial Setting Time Variation (vs Control)
From 1 hour before to 2.5 hours after (as per IS 9103)
From 1 hour before to 1.5 hours after
ASTM C494 (Type F)
Length Change (Shrinkage)
Not more than 120% of control (as per IS 9103)
Not more than 135% of control
ASTM C494 (Type F)
Slump Retention Requirement
No quantitative requirement; advises checking at intervals.
Slump ≥ 70% of initial after 30 mins (for slump-retaining category)
EN 934-2 (Table 11)
⚠ Verify details from original standards before use
Key Values7
Quick Reference Values
Minimum Water Reduction20%
Minimum Compressive Strength (3 days vs Control)140%
Minimum Compressive Strength (7 days vs Control)115%
Minimum Compressive Strength (28 days vs Control)115%
Initial Setting Time Variation from ControlNot more than 30 minutes before
Final Setting Time Variation from ControlNot more than 60 minutes before
Chloride Content (Max)0.2% by mass of admixture
Tables & Referenced Sections
Key Tables
Table 1 - Requirements of Superplasticizing Admixtures
Key Clauses
Clause 1.1 - Purpose of Superplasticizers
Clause 4 - Requirements of Superplasticizing Admixtures
What is the main purpose of using a superplasticizer?+
To produce flowing concrete for easy placement without adding extra water, or to produce high-strength concrete by significantly reducing the water-cement ratio while maintaining workability (Clause 1.1).
What is the minimum required water reduction for an admixture to be classified as a superplasticizer?+
A minimum of 20% compared to the control mix (Table 1).
How much should the 3-day strength of superplasticized concrete increase?+
It should be at least 140% of the compressive strength of the control concrete mix (Table 1).
Is this standard still active?+
No, this standard has been superseded and its contents are now covered under IS 9103:1999 (Specification for Concrete Admixtures).