IS 5491:1969 is the Indian Standard (BIS) for laying of in-situ granolithic concrete floor topping. 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
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Thickness (on hardened base) | 25 mm to 40 mm | Minimum 20 mm (3/4 inch) recommended for bonded toppings. | ACI 302.1R-15 |
| Maximum Aggregate Size | 10 mm (not to exceed 1/2 to 1/3 of topping thickness) | Should not exceed 1/3 of the topping thickness; typically 10 mm. | BS 8204-2:2003 |
| Minimum Compressive Strength (28-day) | Not specified; mix is prescriptive. | Specifies strength categories; e.g., 'Special high strength' requires ≥ 55 N/mm². | BS 8204-2:2003 |
| Minimum Wet Curing Period | 14 days | Minimum 7 days for most concrete floors. | ACI 302.1R-15 |
| Panel / Bay Size | Not to exceed 4 m² area, laid in alternate panels. | Joints in topping must align with joints in base slab. Spacing is a complex function of design, not a fixed area. | ACI 302.1R-15 |
| Surface Regularity (Tolerance) | Gap under a 3 m straightedge shall not exceed 3 mm. | Category SR1 (highest class) permits max 3 mm deviation under a 2 m straightedge. | BS 8204-2:2003 |