Welcome to AAC Block

AAC has High Thermal Efficiency

Autoclaved aerated concrete is further considered a sustainable building product because of its excellent insulating qualities resulting in increased energy efficiency. AAC’s thermal efficiency stems from the three factors. First, AAC structures results in solid wall construction with integrated insulation.  Entire wall coverage prevents the thermal bridging associated with conventional stud – framed walls, which essentially leave cold gaps around every stud and header.Second, the solid wall construction of AAC structures creates an airtight building envelope, minimizing uncontrolled air changes while helping maintain desired indoor temperatures and maximizing the efficiency of HVAC equipment. Third, AAC structure benefit from the added value of thermal mass and low thermal conductivity. Though an eight inch wall has a steady state R – value and the benefits of thermal mass, however, vary by location and greatest in regions where the outdoor temperature fluctuates above and below the desired indoor temperature over a 24 – hour period. AAC block supplier in West Bengal. autoclaved aerated concrete, aac block plant

AAC Reduces Noise Pollution and Improves Indoor Air Quality

As additional quality contributing the sustainability of a building products is its ability to reduce and absorb noise or to improve or maintain indoor air quality.  Due to its millions of independent air cells, which dampen sound transmission. AAC has excellent sound insulation and absorption qualities.Moreover, because AAC construction has very low air infiltration and is mold resistant, indoor air quality of AAC structures improved relative to competitors, AAC performance as both a structural and insulation material also eliminates the need for other materials (like fibreglass insulation) that may contribute to poor indoor air quality. AAC block supplier in West Bengal. autoclaved aerated concrete, aac block plant

AAC structure Are Well – Suited to Withstand Fires, Earthquakes and Other Natural Disasters

AAC is inorganic, non-combustible, and virtually fireproof.  It has received a 4 hour UL fire rating and has a melting point of over 2900 degrees Fahrenheit. As a result, the use of AAC eliminates the need for additional fireproofing materials.  Moreover, because AAC is completely inert, it does not emit toxic gases even when exposed to fire. AAC buildings can be engineered for earthquake and hurricane prone areas, and such buildings have performed well, due to its light weight, the losses and damages will be very less. They also were immune from fires started during the earthquake and even acted as firebreaks. The ability of AAC structure to withstand fire and natural disasters minimize waste, contamination to the surrounding environment.

AAC Structures Are Price Competitive

Due to AAC’s low density the structural load (dead load) will be very less and in turn the structural members can be designed accordingly. In turn the requirement of concrete and steel will be less for foundation and all structural members of the building. Because of the bigger size of AAC blocks the number of joints will be less and in turn the requirement of cement mortar will be less. The labour required to lay the AAC blocks will also be considerably lesser and time will be saved too. Due to the thermal efficiency of AAC blocks the cost of energy will be lowered due to lower operating and maintenance costs, the structure’s longer life span and lower initial outlays for heating and cooling systems. When looked at from the point of view of an individual or an entire country, this amounts to tremendous savings. That is why this technology holds so much promise for a country like India, which is facing acute scarcity of electricity.

A Truly Green Material

In the manufacture of clay bricks, the top soil is depleted and natural resources are eroded, resulting in ecological imbalances. But by utilising fly ash which is the waste material generated by thermal power stations, we will be saving the natural resources on one hand and putting the industrial waste into productive use. This makes Cell O Con one of the best examples of a truly “green product”, in every sense of the term. Sand is another alternative to fly ash for manufacturing AAC blocks. However, sand cannot be recycled like fly ash and therefore manufacturing AAC blocks using sand cannot be considered a green process and the resultant product a green product. Using sand will only erode the natural river bed, thereby changing its course and result in ecological imbalances.As every structural engineer knows, that adequate care needs to be given to masonry wall members, since it gives full shape and structure to the building. I have realized that everyone neglecting the wall member in the structure will mean that importance of the masonry wall will have been neglected by all parties’ concerned – structural consultants, builders, promoters, contractors, etc. This will mean not following the specifications laid down in BIS 6041 of 1985 and BIS 1905 of 1987, which will lead to problems like, shear crack, horizontal crack and settlement crack etc., in the wall at a later date. I therefore appeal to all friends, contractors, constructors, builders, etc, to follow certain important guidelines given below before and during construction of AAC masonry wall for better achievement.Let us take a closer look at some key points about Cell O Con AAC Blocks.–    Compressive Strength –    Water Absorption –    Laying Procedure AAC block supplier in West Bengal. autoclaved aerated concrete, aac block plant

The Compressive Strength Test

The test specimen should be a cube, of size 200mm x 200mm x 200mm or 150 mm x 150mm x 150 mm (cut from block a block) and tested with a machine of least count 1kN. Load has to be applied perpendicular to the aeration (please check with the manufacturer for ascertaining the correct side). The cube has to be oven dried at 50 C before testing. Testing must be carried out at room temperature. This test conforms to BIS 6441. (Part 5)-1972. Blocks of thickness less than 150mm are not suitable for testing compressive strength. If this block is tested, it will yield lesser values of compressive strength. AAC block supplier in West Bengal. autoclaved aerated concrete, aac block plant

Water Absorption Test

There is no specific water absorption test prescribed in BIS 2185-3 or BS 6073-1 for water absorption of AAC blocks. These blocks, being lighter, float on water and hence any test involving submersion is not possible. The test for water absorption by capillarity measures the rate at which moisture is taken up by the blocks in exposed fair–faced walling. BS EN 771-4 requires the water absorption by capillarity to be measured over a period of 10 minutes in accordance with BS EN 772-11 if rendering is not done. However we recommend rendering for fair faced walls.We have tested the surface water absorption by fixing the glass piece of 75 mm depth in the periphery of the specimen 600mm x 200mm x200mm size block with water tight (without water leak) and water to be filled fully for 75mm  depth and to be kept in room temperature to avoid evaporation of about 24 hrs or 48 Hrs. After the specified time the specimen to be cut and the water penetration due to capillary action to be verified. This proves that water penetration due to capillary action is about less than 5% by surface area. AAC block supplier in West Bengal. autoclaved aerated concrete, aac block plant

Laying Procedures

I have shown through the model picture for laying the AAC Blocks in which the provision of sill bond beam, lintel bond beam, stud reinforcement for converting the wall load into the uniformly distributed load to avoid any type of shear crack and horizontal cracks. Many suggestions have been given below for how to lay and use AAC Blocks & Cement Mortar in a detailed manner. AAC block supplier in West Bengal. autoclaved aerated concrete, aac block plant

The Mortar and Bond

To understand the behaviour and visualise the performance of the masonry, one has to understand the basic characteristics of the unit, properties of mortar and their interrelations which determine the efficiency of the bond between them.When mortar is applied on the surface of a masonry unit, it absorbs water from the mortar, with it the finer particles of the cementing material travel to fill up the voids at the interface, forming the bond layer.For the mortar to have a moderate rate of absorption by the masonry unit and good workability in application and spreading of the mortar, it is essential that the mortar should have high water retaining capacity. Such a mortar, being plastic in nature, does not segregate even with low absorption masonry units. The mortars with low water retaining capacity are poor in workability. If the initial rate of absorption is high (IRA), the blocks absorb water too fast. This causes formation of channels in the mortar joints which create voids on drying, thus making the joint permeable. On the contrary, if the IRA is low, the water from joining the mortar accumulates at the interface as a result of segregation. This on drying creates a clear cut crack at the interface and forms a source leakage. AAC block supplier in West Bengal. autoclaved aerated concrete, aac block plant

Drying Shrinkage / Moisture Movement

The drying shrinkage (moisture movement) of the mortar is to be avoided in the AAC masonry construction by using thin lean mortar with allowable water absorptions. The mortar to be used for masonry should always be weaker than the masonry unit. This facilitates an even distribution of drying and ensures shrinkage cracks occur at a few places passing through masonry units. They occur at weaker sections of the wall. Because, they are less in number, they are wider and hence affect the impermeability to a greater extent.Significance of pre-wetting of the masonry units with high IRA and not pre-wetting those with lower IRA must be borne in mind. Use of good workable, water retentive mortar results in good quality bond, better compressive strength, shear resistance and impermeability.Cheapest price & Grade A quality of AAC blocks.We are a leading supplier of AAC block,joining mortar,fly ash bricks,tile & stone adhesive, care products etc… Aac block supplier in Kolkata.Our product AAC block, Fly ash bricks, Block adhesive, Tile & stone adhesive, Tools, Ready Mix Plaster, rubble etc… 

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