What are the different classes of lime-pozzolana mixture specified in IS 4098?

They are classified into three grades: LP 1, LP 2, and LP 3, primarily distinguished by their compressive strength.

What is the minimum 28-day compressive strength for an LP 1 mixture?

3.0 N/mm2 as specified in Table 1.

What are the standard setting time requirements for lime-pozzolana mixtures?

The initial setting time must be at least 2 hours (120 minutes), and the final setting time must not exceed 24 hours.

IS 4098

: 1983

lime-pozzolana mixture

CurrentSpecializedSpecificationMaterials Science · Building Limes and Gypsum Products

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This standard covers the physical and chemical requirements for lime-pozzolana mixtures used as a binder in masonry mortars, plasters, and foundation concrete. It categorizes the mixtures into LP 1, LP 2, and LP 3 based on strength development and intended application.

lime-pozzolana mixture

Quick Reference Values

LP 1 Compressive Strength (7 days)Min 2.0 N/mm2

LP 1 Compressive Strength (28 days)Min 3.0 N/mm2

LP 2 Compressive Strength (28 days)Min 1.5 N/mm2

Initial Setting TimeMin 120 minutes

Final Setting TimeMax 24 hours

Fineness (Retained on 150-micron IS sieve)Max 10 percent by mass

Practical Notes

Lime-pozzolana mixtures develop strength much slower than ordinary Portland cement, requiring extended wet curing periods.

LP 1 is typically used for masonry mortars and base concrete, whereas LP 2 and LP 3 are suited for plastering and pointing works.

Store in completely damp-proof conditions, as the active lime component deteriorates quickly upon exposure to moisture or high humidity.