Similar International Standards
EN 459-1:2015CEN (European Committee for Standardization), Europe
HighCurrent
Building lime - Part 1: Definitions, specifications and conformity criteria
Covers 'Formulated Limes' (FL), which are mixtures of building lime with hydraulic and/or pozzolanic materials.
ASTM C1707 / C1707M - 20ASTM International, USA
HighCurrent
Standard Specification for Pozzolanic Hydraulic Cements for General Concrete
Specifies pozzolanic hydraulic cements, including lime-pozzolan types (Type Pz-L), for use in concrete and mortar.
ASTM C595 / C595M - 21ASTM International, USA
MediumCurrent
Standard Specification for Blended Hydraulic Cements
Covers blended cements like Type IP (Portland-pozzolan cement), which is conceptually similar but uses Portland cement instead of lime.
BS 4027:1996BSI (British Standards Institution), UK
LowWithdrawn
Specification for sulfate-resisting Portland cement
While withdrawn, it involved blending with pozzolans (like fly ash) for durability, a concept shared with the IS code's use of pozzolana.
Key Differences
≠Primary Binder: IS 10772 is explicitly based on a lime-pozzolana reaction. Some international equivalents, like ASTM C595, are primarily based on Portland cement blended with pozzolans, resulting in different hydration chemistry and performance characteristics.
≠Specification Philosophy: IS 10772 is a prescriptive standard for a single product. In contrast, EN 459-1 and ASTM C1707 are more performance-oriented, defining various classes and types based on strength and application, allowing for more formulation flexibility.
≠Setting Time Category: The Indian standard is for a 'quick setting' mixture with a minimum initial set of 30 minutes. Some equivalents, like European Hydraulic Limes (EN 459-1), often have much longer initial setting times (e.g., > 1-2 hours), prioritizing workability duration over rapid hardening.
≠Soundness Test Method: IS 10772 mandates the Le Chatelier test for soundness (volume stability). ASTM standards like C1707 and C595 typically specify the Autoclave Expansion test, which is a different method performed under high pressure and temperature.
Key Similarities
≈Fundamental Chemistry: All standards rely on the pozzolanic reaction, where amorphous silica and alumina from the pozzolanic material react with calcium hydroxide (from lime or Portland cement hydration) in the presence of water to form stable, cementitious compounds.
≈Intended Application: The IS mixture and its international counterparts are primarily intended for use in masonry mortar, plastering, rendering, and foundation bases, where properties like good workability, low heat of hydration, and long-term strength gain are beneficial.
≈Core Performance Tests: Despite variations in limits and methods, all standards evaluate the binder based on a common set of critical properties: compressive strength, setting time, soundness (volume stability), and fineness.
≈Use of Industrial By-products: These standards facilitate the use of industrial by-products and natural materials like fly ash, calcined clay, and volcanic ash as pozzolans, promoting sustainability in construction.