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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
Overview
Status
Current
Usage level
Specialized
Domain
Architectural — Flooring, Wall Finishing and Roofing
BS 8204-2:2003+A2:2011British Standards Institution (BSI), United Kingdom
HighCurrent
Screeds, bases and in-situ floorings. Concrete wearing surfaces. Code of practice
Directly addresses the materials, design, and application of high-strength concrete wearing surfaces, equivalent to granolithic toppings.
ACI 302.1R-15American Concrete Institute (ACI), USA
HighCurrent
Guide for Concrete Floor and Slab Construction
Provides comprehensive guidance on two-course floor systems, including bonded toppings, covering materials, mix design, and finishing for durable wearing surfaces.
TR34 Fourth EditionThe Concrete Society, United Kingdom
MediumCurrent
Concrete industrial ground floors: A guide to their design and construction
While focused on industrial floors, it is a de facto international guide for high-performance concrete floors, with extensive details on heavy-duty toppings.
Key Differences
≠IS 5491 uses a prescriptive, volumetric mix design (e.g., 1:2 cement:aggregate), whereas modern standards like ACI 302.1R and BS 8204-2 emphasize performance-based specifications (e.g., required compressive strength, abrasion resistance, shrinkage limits).
≠Modern standards provide highly quantitative methods for specifying and measuring surface flatness and levelness (e.g., F-Numbers in ACI 302.1R), which are far more precise than the qualitative 'check with a 3m straightedge' method in IS 5491.
≠IS 5491 primarily specifies wet curing (ponding, wet hessian). International standards extensively cover the use and specification of high-performance membrane-forming curing compounds (e.g., ASTM C1315), which are often more practical and efficient.
≠Modern standards incorporate the use of chemical admixtures like superplasticizers to achieve very low water-cement ratios for high strength and low shrinkage, a technology not mentioned in the 1969 Indian standard.
Key Similarities
≈All standards emphasize the critical importance of proper base concrete preparation, including removing all laitance and contaminants and creating a rough surface profile to ensure a strong mechanical bond.
≈The principle of using a low water-cement ratio ('stiff consistency') to achieve high density, high strength, and low shrinkage is fundamental to both IS 5491 and its modern international counterparts.
≈The core concept of using selected, hard, and abrasion-resistant aggregates (like granite or basalt) is the defining feature of a granolithic topping and is a key material requirement across all related standards.
≈The application of a cement-sand or neat cement slurry as a bonding agent onto the prepared, saturated-surface-dry (SSD) base just before placing the topping is a traditional and effective method recommended in both IS 5491 and discussed in modern guides like ACI 302.1R.
Parameter Comparison
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.