A Comparitive Analysys of AAC Blocks Vs Burnt Bricks

Sr. No. Parameters Wallnett AAC Block Burnt Clay Bricks Remarks
1 Size 600 / 625 mm x 200 / 240 mm x 75-300 mm 225 mm x 100 mm x 65 mm / 230 mm x 75 mm x 115 mm Clay bricks need more mortar since size is smaller. But mortar requirement is lesser in Wallnett AAC blocks due to Bigger size.
2 Precision in Siz 1.5 mm (+/-) 5  to 10 mm (+/-) The Wallnett AAC block is dimensionally more accurate as it is produced with advanced wire cut technology in a factory.
3 Compressive Strength 3-5 N/mm2 (IS 2185, Part-3 2.5-3 N/mm2 Wallnett AAC blocks has higher compressive strength i.e. it can withstand greater loads than bricks.
4 Density 550-650 kg/m3 (oven dry) 1800-2000 kg/ m3 Using Wallnett AAC blocks reduces the load on the foundation and other
structural components in a structure due to its lower self-weight. 55%
reduction in weight of walls. Up to 15% savings in cost of structure has been
observed.Because of reduction in self-weight, Wallnett AAC block construction attracts, Less earthquake load.
5 Fire Resistance 2 to 7 hours depending upon thickness Around 2 hours Wallnett AAC blocks have air voids and hence have better fire resisting property
compared to red clay bricks. The melting point of AAC blocks are over 1600
degree Celsius, more than twice the typical temperature in building fire 650 degree Celsius.
6 Energy Saving Approx. 25% reduction in air
conditioner load /25 –30% less electricity consumption on HVAC
Low Wallnett AAC blocks are resistant to thermal variations. It reduces the total load
of refrigeration and air conditioning. Though initial installation cost may remain same but Wallnett AAC blocks reduces operation and maintenance cost drastically.
7 Thermal Conductivity K value = 0.16 W/mk K value = 0.81 W/mk Wallnett AAC block with very low thermal conductivity keeps interior remain cool in summer and warm in winter and best for both internal and external construction.
8 Noise Transmission / Sound Insulation 45-45db for 200mm thick wall More than 50db for 230mm thick wall The Wallnett AAC block has better sound insulation properties, due to its air
voids presence. Wallnett AAC blocks have an excellent Sound transmission
Class (STC) rating of up to 45 db. Therefore it is an ideal material for wall construction in hotels, auditoriums, studios, hospitals etc.
9 Mortar consumption per M3 with 1:6 0.5 bag of cemen 1.40 bag of Wallnett AAC blocks are 7 to 8 times bigger than the size of the conventional
bricks. Bigger size means less number of joints. Less joints results in lesser
quantity of mortar for building. There is overall 60% reduction in use of mortar.
10 Savings in Plaste overall 35% reduction in the cost of plastering   Plaster for Wallnett AAC block is much less compared to conventional bricks.
Wallnett AAC blocks have uniform shape and texture, which gives even surface
to the walls. The Wallnett AAC block, when built has both faces as fair faces,
unlike brick work, which has only one face as a fair face. Hence, the thickness of Plaster for Wallnett AAC block is much less compared to conventional bricks.
11 Speed of construction Very high due to bigger size, light
weight, which results in faster
construction, saving on labour and jointing mortar due to elimination of Vertical Joints
Comparatively lower The Productivity of the mason (with Wallnett AAC blocks) increases up to 3 times, because of less number of joints.
12 Environmental Impact Soil Consumption   Wallnett AAC block is 100% Green building material & is a walling material of a choice in LEED certified buildings. This helps in reducing carbon footprints.
No fertile top soil consumed One clay brik consumes 3.2 kgs of top soil
Uses fly ash which is a thermal power
plant waste product & thus no consumption of top soil
One sqft of carpet area with clay
brick walling will consume 25.5 kgs of top soil
Fuel Consumption  
One sq ft of carpet area with AAC blocks will consume 0.9677 kgs of coal One sqft of carpet area with clay
brick will consume 8 kgs of coal
13 Moisture Resistance Very Good Average Wallnett AAC blocks do not have any 'micro-pores' of continues 'capillaries' through which exterior surface water can be absorbed to interiors. It means longer life to the paints and interiors free from growth of any kind of fungus, providing healthier and long lasting interiors to the occupants.
14 Water Absorption
Coefficient in Kg/ m2 x h0.5
4–6 (no continuous pores and capillaries) 2 –30
(suction through continuous capillary action)
Use of Wallnett AAC blocks leads to Long life of paint and healthy interiors.
15 Quality / Durability Uniform and finished Normally varies Wallnett AAC blocks being produced in a factory with automated processes, so, they have uniform quality and hence are more durable
16 Water Usage during Manufacturing Low, needs only surface  wetting before use High, needs curing before use Wallnett AAC blocks saves water consumption.
17 Earth quake resistant Good. Generally, they have
Conformance to requirement of seismic zone IV & V
Average. Conditional Conformance to seismic zones IV & V Earthquake forces on structure are proportional to the weight of the building,
henceWallnett AAC blocks shows excellent resistant to earthquake forces.
They absorb and transmit less seismic forces in event of any earthquake.
The structure has millions of tiny cells which cushions buildings from major force, preventing progressive collapse.
18 Maintenanc Comparatively Lesser due to its superior properties High Wallnett AAC block reduces operating cost by 30% to 40%.Reduces overall
construction cost by 2.5% as it requires less jointing and reduces need for
cement and steel. High-insulation blocks save up to 30% in energy costs. Wall
painting and plastering last longer as almost nil efflorescence affects AAC. This translates into lower maintenance costs.
19 Wastage Due to Breakages Minimal (1-5%) Approximate 10 to 15% If any breakage in the Wallnett AAC blocks, it would be into two or three pieces which can be utilized in masonry as "brick bat"
20 Pest & Termite Resistance High.
AAC blocks are inorganic, insect
resistant and solid wall construction
material. Termites and ants do not eat or nest in AAC blocks
Low AAC Blocks do not allow spread of termites and growth of pests and hence provides longer life to expensive wooden interiors.
21 Fume Resistance Good Average AAC Blocks are completely inorganic and hence do not generate any toxic
fumes or poisonous gases harmful to the occupants. The airtight nature of blocks also prevents toxic fumes from spreading into other parts of building.

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