The IS 1489 Part 2:1991 standard outlines the specifications for Portland-pozzolana cement produced using calcined clay pozzolana, either alone or combined with fly ash. It establishes the chemical, physical, and strength parameters along with procedures for sampling, testing, packaging, and labeling to guarantee high-quality blended cement suited for construction requiring durability and controlled heat hydration.
Overview
The IS 1489 Part 2:1991 standard outlines the specifications for Portland-pozzolana cement produced using calcined clay pozzolana, either alone or combined with fly ash. It establishes the chemical, physical, and strength parameters along with procedures for sampling, testing, packaging, and labeling to guarantee high-quality blended cement suited for construction requiring durability and controlled heat hydration.
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Frequently Asked
As per Clause 6 of IS 1489 Part 2, Portland-pozzolana cement must meet the chemical requirements specified in Table 1 of the standard. Key chemical components controlled include loss on ignition (≤ 5%), magnesia (MgO ≤ 0.9%), and insoluble materials limited by a formula based on pozzolana content (10–25%). The cement must use pozzolana conforming to IS 1344 or combined with fly ash per IS 3812, and clinker meeting IS 269 standards. Only gypsum and approved air-entraining agents (up to 1%) are permitted as additives, ensuring the cement’s quality and durability.
Compressive strength testing for the cement involves preparing mortar cubes (50 mm sides) with a mix ratio of 1 part cement to 3 parts standard sand by mass. Water added is calculated as (P/4 + 3)%, where P represents the water content for normal consistency. Testing follows IS 4031 (Part 6) procedures. Minimum compressive strengths required are 16 MPa at 3 days, 22 MPa at 7 days, and 33 MPa at 28 days, averaged from at least three specimens. If initial tests fail, aeration of the sample for 7 days under controlled humidity is required before retesting.
IS 1489 Part 2 permits the use of calcined clay pozzolana complying with IS 1344, fly ash conforming to IS 3812, or a blend of both. These materials must have a minimum fineness of 320 m²/kg (Blaine) and exhibit an average compressive strength of at least 4.0 MPa in lime reactivity tests as per IS 1727. The pozzolana content in the cement should range between 10% and 25% by weight, with only gypsum and approved air-entraining agents up to 1% allowed as additives to maintain uniformity and effectiveness.
For export consignments, Portland-pozzolana cement may be packaged in bags or drums. The average net weight per container is established through mutual agreement between purchaser and manufacturer, with no fixed standard weight mandated. Each package must be clearly marked using indelible ink with the label "FOR EXPORT" along with the declared net mass, ensuring traceability and conformity with purchaser specifications.
Manufacturers must perform sampling according to IS 3535 to obtain representative samples either from bulk or bagged cement. Testing follows IS 4031 physical and chemical methods alongside IS 1489 Part 2 clauses. Cement stored beyond six months in bulk or three months in bags requires retesting prior to use. If initial tests fail, samples should be aerated for seven days at controlled humidity before retesting for expansion limits. The manufacturer is also responsible for providing a certificate within ten days of dispatch confirming compliance and pozzolana content within ±3%.
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