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IS 6073:2006 is the Indian Standard (BIS) for autoclaved reinforced cellular concrete floor and roof slabs. This standard specifies the requirements for materials, dimensions, manufacture, physical properties, and testing of autoclaved reinforced cellular concrete (ARCC) slabs for floors and roofs. It covers two grades of slabs and outlines procedures for quality control, sampling, and acceptance, including the crucial transverse load test.
Autoclaved reinforced cellular concrete floor and roof slabs
Overview
Status
Current
Usage level
Specialized
Domain
Structural Engineering — Planning, Housing and Pre-fabricated Construction
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
Practical Notes
! ARCC slabs are significantly lighter than traditional RCC, reducing dead load on the structure and foundation, but possess lower strength and require careful design integration.
! Handling and erection require special attention to prevent chipping, cracking, or damage to these prefabricated units, which are more brittle than standard concrete.
! The anti-corrosion coating on the reinforcement cage is critical for the long-term durability of the slab and must be verified as per Clause 4.5 before casting.
EN 12602:2016CEN (European Committee for Standardization), Europe
HighCurrent
Prefabricated reinforced components of autoclaved aerated concrete
Specifies requirements for prefabricated reinforced floor, roof, wall, and lintel components made of AAC.
ASTM C1694-09(2017)ASTM International, USA
HighCurrent
Standard Specification for Reinforced Autoclaved Aerated Concrete (AAC) Elements
Covers reinforced AAC elements, including floor and roof panels, specifying material and physical properties.
AS 5146.1:2015Standards Australia, Australia
HighCurrent
Reinforced autoclaved aerated concrete - General requirements
Details the material and manufacturing requirements for reinforced AAC products used in construction.
DIN 4223-3:2004-12DIN (Deutsches Institut für Normung), Germany
MediumWithdrawn
Prefabricated reinforced components of autoclaved aerated concrete with a coarse-pored structure - Part 3: Roof and floor panels
A former German national standard that provided the basis for many aspects of the current EN standard.
Key Differences
≠IS 6073 specifies material grades based on density ranges (e.g., Grade 1: 651-750 kg/m³), while EN 12602 uses a dual classification system of density classes (e.g., D500) and compressive strength classes (e.g., AAC 4).
≠For corrosion protection of reinforcement, IS 6073 prescriptively suggests a cement-latex composite coating, whereas EN 12602 is more performance-based, requiring the manufacturer to declare the system used without mandating a specific type.
≠The Indian standard references Indian design codes like IS 456 for structural principles, while European and American standards reference their respective design frameworks (e.g., Eurocode 2 for EN 12602, ACI 523.4R for ASTM C1694).
≠Dimensional tolerances for length differ. IS 6073 allows a tolerance of ±5 mm for slabs over 3m long, while EN 12602 maintains a stricter tolerance of ±3 mm regardless of length.
Key Similarities
≈All standards cover prefabricated, factory-made reinforced concrete elements intended for use as floor and roof slabs.
≈The core material in all standards is autoclaved cellular (aerated) concrete, a lightweight, structural material with thermal insulation properties.
≈All standards mandate the use of steel reinforcement with mandatory corrosion protection to ensure long-term structural integrity within the alkaline AAC environment.
≈Testing protocols for key properties such as compressive strength, dry density, and dimensional accuracy are required by all standards to ensure product quality and conformity.
≈Requirements for marking and labeling of slabs for identification, traceability, and proper installation are a common feature across all the specified standards.
What are the standard grades of ARCC slabs as per IS 6073?+
The code specifies two grades: Grade I (min. avg. compressive strength 3.0 N/mm²) and Grade II (min. avg. compressive strength 2.0 N/mm²) as per Table 1.
What is the minimum clear cover for reinforcement in these slabs?+
For slabs up to 200 mm thick, the minimum clear cover is 15 mm. For slabs thicker than 200 mm, it is 20 mm (Table 3).
What is the maximum allowed deflection during a load test?+
The maximum deflection under the specified test load should not exceed the span divided by 250 (Clause 8.3.1).
What is the standard width for these prefabricated slabs?+
The standard width is 600 mm, with a permissible tolerance of ±3 mm (Clause 5.2 and Table 2).