What is the minimum compressive strength at 28 days?

3.5 N/mm² (MPa), as per Table 1.

What are the limits for setting time?

The initial setting time shall not be less than 30 minutes, and the final setting time shall not be more than 600 minutes (10 hours) (Table 1).

Can this mixture be used for making concrete?

No, this standard is intended for its use as a binder in mortars for masonry and plasters, not for structural concrete.

What raw materials are used to make this mixture?

It is made from quick lime or hydrated lime (conforming to IS 712) and a pozzolanic material like calcined clay or fly ash (conforming to IS 1344 or IS 3812).

IS 10772

: 1983

quick setting lime pozzolana mixture

CurrentSpecializedSpecificationMaterials Science · Building Limes and Gypsum Products

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This standard specifies the requirements for quick-setting lime pozzolana mixture, used as a binding material in mortars and plasters. It covers the material composition, manufacturing process, physical properties like setting time and compressive strength, and chemical properties.

quick setting lime pozzolana mixture

Quick Reference Values

Minimum initial setting time30 minutes

Maximum final setting time600 minutes

Minimum compressive strength at 7 days2.5 N/mm²

Minimum compressive strength at 28 days3.5 N/mm²

Maximum soundness by Le Chatelier method10 mm

Maximum soundness by Autoclave method1.0 %

Practical Notes

This material is not a substitute for Portland cement in structural applications due to its significantly lower strength characteristics.

The performance is highly dependent on the reactivity of the pozzolana and quality of the lime. Ensure raw materials conform to their respective IS codes.

Extended and moist curing is crucial for strength development, as pozzolanic reactions are slower than cement hydration.