What are the typical uses of lime-pozzolana concrete?

It's used for foundations, base courses for floors and roads, and for making masonry blocks, especially where high strength is not a primary requirement (Clause 1.2).

What is the minimum curing period for this concrete?

A minimum of 28 days under continuously moist conditions is specified to ensure proper strength gain (Clause 8.4).

What are the concrete grades specified in this code?

The code specifies grades from LC 2 to LC 7.5, where the number indicates the 28-day characteristic compressive strength in N/mm² (Table 2).

Can lime-pozzolana concrete be used for reinforced concrete work?

Generally not recommended. If used, specific precautions must be taken to ensure the pH remains above 9.5 to prevent corrosion of reinforcement (Annex A).

IS 5817

: 1992

Code of practice for preparation and use of lime-pozzolana mixture concrete in buildings and roads

CurrentSpecializedCode of PracticeMaterials Science · Building Limes and Gypsum Products

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This standard provides a code of practice for the preparation and use of lime-pozzolana concrete. It covers material requirements, mix proportions, site practices, and properties for applications in buildings and roads where high-strength concrete is not essential.

Code of practice for preparation and use of lime-pozzolana mixture concrete in buildings and roads

Quick Reference Values

Minimum 28-day compressive strength (LC 4 Grade)4.0 N/mm²

Minimum 90-day compressive strength (LC 4 Grade)5.6 N/mm²

Maximum nominal size of coarse aggregate (general use)40 mm

Maximum nominal size of coarse aggregate (thin sections)20 mm

Minimum curing period28 days

Recommended slump for mass concrete25-50 mm

Practical Notes

Lime-pozzolana concrete gains strength much slower than ordinary Portland cement (OPC) concrete; hence, a prolonged curing period of at least 28 days is crucial for strength development.

This type of concrete is ideal for sustainable and low-cost construction, especially in conservation works or for sub-grades, foundations, and masonry blocks.

The quality and reactivity of the pozzolanic material (e.g., fly ash, surkhi) are critical and directly influence the final strength and durability of the concrete.