Similar International Standards
ASTM C593-19ASTM International, USA
HighCurrent
Standard Specification for Fly Ash and Other Pozzolans for Use With Lime
Specifies pozzolans for use with lime, a direct parallel to the core components of the IS code.
ASTM C618-22aASTM International, USA
MediumCurrent
Standard Specification for Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in Concrete
Defines pozzolan types (Class F, N, C), but primarily for use with Portland cement, not lime.
EN 459-1:2015CEN (European Committee for Standardization), Europe
MediumCurrent
Building lime - Part 1: Definitions, specifications and conformity criteria
Specifies the lime component of the mixture in great detail, but not the pozzolan or the mixture itself.
BS 3892-1:1997BSI, United Kingdom
LowWithdrawn
Pulverized-fuel ash. Specification for pulverized-fuel ash for use with Portland cement
A historic standard for fly ash (pozzolan) but, like ASTM C618, it focused on use with cement.
Key Differences
≠IS 4098 is a design criteria code for using lime-pozzolana concrete in hydraulic structures, whereas its closest international equivalent, ASTM C593, is a material specification for pozzolans intended for use with lime, primarily in soil stabilization.
≠Strength verification in Indian Standards (IS 1727) is often based on a 'Lime Reactivity Test' at 28 days under normal curing. In contrast, ASTM C593 specifies a faster, accelerated strength test at 7 days at an elevated temperature (38°C).
≠Indian standards for pozzolana (like IS 1344 for calcined clay) are less prescriptive about the source material's chemical classification compared to ASTM C618, which defines distinct Class N, F, and C pozzolans with different chemical requirements.
≠IS 4098 provides mix design guidance and strength grades for the final concrete (e.g., LPC 20, LPC 40). International material specifications like ASTM C593 do not provide such application-specific design guidance; they only qualify the raw material.
Key Similarities
≈Both systems are fundamentally based on the pozzolanic reaction between reactive silica/alumina in the pozzolan and calcium hydroxide from lime to form a cementitious binder.
≈Both the Indian and international standards rely on a performance-based approach, using the compressive strength of a standardized mortar or mixture as a primary acceptance criterion for the pozzolanic material.
≈There is a common emphasis on controlling deleterious substances. Both systems place limits on impurities like Sulphur Trioxide (SO3) and Loss on Ignition (LOI) to ensure durability.
≈Fineness of the pozzolan is recognized as critical for reactivity in both Indian and international standards, with specific limits placed on the maximum percentage of material retained on a fine sieve.