Quality Assurance & IS Codes
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Indian Standard for AAC Blocks
Conforming to Bureau of Indian Standard Code no- 2185 (Part-3):1984
Relevant Indian Standards:
- IS: 6041 Code of practice construction of autoclaved cellular concrete block masonry. For more info, click here.
- IS: 2185 Part 3:Specification for concrete masonry units ( Autoclaved cellular concrete blocks). For more info, click here.
- IS: 1661 Code of practice for application of cement and cement-lime plaster finishes. For more info, click here.
- IS: 1905 Code of practice for structural use of un –reinforced masonry. For more info, click here.
- IS: 2250 Code of practice for preparation and use of masonry mortars. For more info, click here.
Physical Specifications of the Block
Physical Size
As per Bureau of Indian Standard Code no – 2185 (Part-3):1984, physical sizes of AAC blocks (Clause 3.2) Concrete Block shall be referred so by its nominal dimensions. The term ‘nominal’ means that the dimension includes the thickness of the mortar joint.
The size of AAC blocks are as under :-
Length | 600 mm (23.6 in) & 625 mm (24.6in) |
Height | 200 mm (8 in), 240 mm (9.5 in) & 250 mm (10 in) |
Width | 100, 115, 125, 150, 200, 225, 250, 300mm (4, 41⁄2, 5, 6, 8, 9 10, 12 in) |
Density, Strength & Thermal Conductivity
As per IS 2185 (Part 3), 1984, Clauses 4.1,8.3,8.4,11.2,11.3,11.4 :-
Density in oven dry condition (kg/cbm) | Compressive Strength (Min) Grade-1 (N/sq.mm) | Compressive Strength (Min) Grade-2 (N/sq.mm) | Thermal Conductivity (W/m.k) |
---|---|---|---|
451 to 550 | 2.0 | 1.5 | 0.21 |
551 to 650 | 4.0 | 3.0 | 0.24 |
651 to 750 | 5.0 | 4.0 | 0.30 |
751 to 850 | 6.0 | 5.0 | 0.37 |
851 to 1000 | 7.0 | 6.0 | 0.42 |