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IS 15478:2004 is the Indian Standard (BIS) for precast concrete hollow core slabs - specification. This standard specifies the requirements for materials, manufacturing, dimensions, tolerances, and quality control for precast concrete hollow core slabs. It covers both reinforced and prestressed types of slabs used in floor and roof construction.
Specifies requirements for precast concrete hollow core slabs, including materials, manufacture, dimensions, tolerances, and testing.
Overview
Status
Current
Usage level
Specialized
Domain
Structural Engineering — Precast and Prefabricated Concrete
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
Practical Notes
! Dimensional tolerances (Table 1) are critical. Non-compliance can lead to major issues during installation, affecting floor levelness and connection details.
! Verify the supplier's documentation, which should include design criteria, concrete grade, strand details, and handling instructions as per Clause 10.
! The code focuses on the product specification. The overall structural design of the floor/roof system using these slabs must be carried out as per IS 456 and IS 1343.
EN 1168:2005+A3:2011CEN (European Committee for Standardization), Europe
HighCurrent
Precast concrete products — Hollow core slabs
Directly equivalent product standard for the specification, requirements, and testing of precast hollow core slabs.
PCI MNL 120-17PCI (Precast/Prestressed Concrete Institute), USA
MediumCurrent
PCI Design Handbook: Precast and Prestressed Concrete
A comprehensive design manual covering hollow core slabs, but not a product specification standard in the same format.
AS 3600:2018Standards Australia, Australia
MediumCurrent
Concrete structures
General concrete design code that includes sections and rules applicable to precast and hollow core slab design, not a dedicated product standard.
BS EN 1168:2005+A3:2011BSI (British Standards Institution), United Kingdom
HighCurrent
Precast concrete products — Hollow core slabs
The UK's national adoption of the European standard EN 1168, making it functionally identical.
Key Differences
≠Concrete strength is specified using 'M' grades (e.g., M40, representing characteristic compressive strength in N/mm²) in IS 15478, whereas EN 1168 uses 'C' classes (e.g., C40/50, representing cylinder/cube strength).
≠Fire resistance rating in IS 15478 is determined based on methods in IS 1642, while EN 1168 uses a more detailed method based on tabulated data, simplified calculations, or advanced calculation models as per Eurocode 2 (EN 1992-1-2).
≠IS 15478 specifies tolerances on the difference in camber between adjacent units, whereas EN 1168 provides tolerances on the actual camber value of a single unit against its calculated theoretical value.
≠Requirements for reinforcement cover in IS 15478 are based on exposure conditions defined in IS 1343, which differ from the more extensive exposure classes (e.g., XC, XD, XS) defined in the Eurocode system referenced by EN 1168.
Key Similarities
≈All standards recognize the same primary manufacturing methods for hollow core slabs, namely slip-forming and extrusion.
≈The fundamental design approach is based on limit state design principles, considering ultimate limit states (flexure, shear) and serviceability limit states (deflection, cracking).
≈All standards specify requirements for constituent materials (cement, aggregates, water, admixtures, prestressing steel) by referencing other national/international material standards.
≈There is a common emphasis on mandatory factory production control, quality assurance procedures, and routine testing of finished products to ensure compliance.