What is the recommended mix proportion for heavy-duty granolithic floors?

1 part cement to 2 parts of specified granite aggregates by volume (Clause 4.1).

What should be the thickness of a granolithic topping on a new concrete base (monolithic construction)?

The topping should have an average thickness of 12 mm (Clause 6.3.1.1).

How soon should the granolithic topping be laid after placing the base concrete in monolithic construction?

Within 2 to 3 hours of the base concrete being laid, while the base is still green and plastic (Clause 6.3.1.1).

What is the minimum curing period for granolithic flooring?

A minimum of 7 days of continuous moist curing is required (Clause 8.1).

IS 5491

: 1969

Code of practice for laying of in-situ granolithic concrete floor topping

CurrentSpecializedCode of PracticeBIMArchitectural · Flooring, Wall Finishing and Roofing

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This standard provides guidelines for laying in-situ granolithic concrete floor toppings, which are known for their high strength and abrasion resistance. It covers material specifications, mix proportions, base preparation, application techniques for bonded and unbonded toppings, and procedures for finishing and curing to ensure a durable floor surface.

Code of practice for laying of in-situ granolithic concrete floor topping

Quick Reference Values

Recommended mix proportion (Cement:Aggregate by volume)1:2

Maximum size of granite aggregate6.3 mm

Minimum thickness of bonded topping12 mm

Minimum thickness of unbonded topping40 mm

Minimum curing period7 days

Maximum water-cement ratio0.45

Practical Notes

Thorough preparation and cleaning of the base concrete is crucial to ensure proper bonding and prevent delamination of the topping.

A stiff, low water-cement ratio mix is essential for achieving the required hardness and minimizing shrinkage cracks.

Continuous moist curing for the specified period is non-negotiable for developing the desired wear resistance and surface integrity.