AAC blocks are light weight Aerated Autoclave Concrete Blocks. It is manufactured through a reaction of aluminium and a proportionate blend of lime, cement and fly ash. During this process, the hydrogen gas that escapes creates millions of tiny air cells, rendering AAC with a strong cellular structure. AAC blocks are further strengthened by high pressure steam curing in autoclaves. The product thus formed is not only light weight but also has higher Compressive strength.
Density of these AAC lightweight blocks usually ranges between 550 – 650 kg/m³. Which is superior to most types of light weight blocks. AAC blocks are 25% stronger than other products of the same density.
Auto-claved Aerated concrete blocks are new to civil industry. It is replacing the current usage of red bricks. As it has a many features when compared with the traditional red bricks. You can learn some of them from below.[NO_TOC]
Benefits of AAC Blocks:
- The nominal size of AAC block is 9″ X 8″ X 4″-12″
- When compared with the volume of normal redbrick with the AAC bricks
Volume of 1 AAC Brick = Volume of 7 red bricks for (9″ X 8″ X 4″)
- AAC block has a weight of 9-12 kg depending on moisture conditions. When compared with redbricks 60% of dead load on structure is decreased.
- It not only decreases the dead load on the structure. It also depreciate the use of Steel and concrete in structure.
- Jointing AAC bricks are economical. As mentioned 1 AAC brick = 7 bricks. For Jointing 7 red bricks with each other it requires more jointing mortar when compared with jointing one AAC block to other.
- Compressive strength of AAC block is higher 5-6N/Sq.m whereas the redbrick has a Compressive strength of 3.50 N/Sq.mm
- Fire resistance: They offer good fire resistance from 2 hours up to 6 hours depends on size. These blocks are highly suitable for the areas where fire safety is of great priority.
- The porous nature of the AAC blocks results into enhanced sound absorption. The Sound Transmission Class (STC) rating of the AAC blocks up to 45 db. Thus, AAC blocks have been the most ideal material for the construction of walls in auditorium, hotels, hospitals, studios, etc.
- Do you know Impact of Earth quake = Weight of the structure. AAC is light weight, it results in higher steadiness so it is safer and reliable than traditional red bricks.
- As the AAC block is very easy to handle, manipulate and use ordinary tools for cutting the wood such as the drill, band saws, etc. could be easily used to cut and align the AAC. Moreover, the AAC blocks come with larger sizes and fewer joints. This ultimately results in faster construction work as the installation time is significantly reduced due to fewer amounts of blocks and the masonry amount involved is also lowered resulting into reduced time-to-finish.
- AAC products do not contain any toxic gas substances.
Environment and Eco-Friendly:-
AAC is a non-toxic product which does not pollute the air, land or water. During the manufacturing process, waste from the cutting process is recycled back with raw materials and used again. There is virtually no waste generated. The energy consumed in the production process is only a fraction compared to the production of other materials. The manufacturing process emits no pollutants and creates no by-products or toxic waste products. AAC is manufactured from natural raw materials. The finished product is thrice the volume of the raw materials used, making it extremely resource-efficient and environmentally friendly.
Comparision between AAC Bricks and Clay bricks:-
|Description||AAC Bricks||Red/Clay bricks|
|Structural Cost||Steel Saving Upto 15%||No Saving|
|Breakage /Wastage||Less than 5%||Average 10 to 12 %|
|Construction speed||Speedy construction due to its big size, light weight & ease to cut in any size or shape||Comparatively slow|
|Cement Mortar for Plaster & Masonry||Requires less due to flat, even surfaces & less number of joints||Requires more due to irregular surface and more number of joints.|
|Availability||Anytime||Shortage in monsoon|
|Energy Saving||Approx. 30% reduction in air-conditioned load||No such saving|
|Accuracy in dimension||99%||90%|
|Cost||30% cheaper than Red bricks||more costlier|
You can also read:-
- 10 Types of footings or foundations which we adopt in Construction
- 16 Different types of slabs in construction
- Different types of Columns in construction
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If pissible please upload the short notes like AAC BLOCKS in pdf.
You can save or bookmark this in your Chrome or any browser instead of PDF so that You never miss this data. Its quite hard again i have to insert images and all other stuff for PDF.
Thanks very Nice Work Sir….!
Thanks for doing this krishna … Also upload civil basic knowledge like beam column …Ratio of agrregate used in the construction … Standard size of brick … Weight of brick … And some interview questions also mentioned here …. You are doing very well … I proud of you …
Thanks for your comment.
Sure i ll update the same
Stay tuned 🙂
i didnt get ur updates ..hoe can i find to get..?
Please send message to 9700078271
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thank you for creating this conversation,
I am Looking to Aerated concrete Structural Designer can work with me In Saudi Arabia -Dammam, I am working in aerated concrete for more then 16 year,
We can reach through My email .
Nice & useful article
but there is one doubt krishnaji ,
The plaster mortar is get properly stick to these AAC blocks for lifelong?
Yes u can use traditional mortar for this.
There are also special types of mortar available in market for joining AAC .
One of them is fixoblock which is premixed in factory. The advantage is u need to add 20% of water to fixoblock and lay it in brick with a thickness of 3 mm where traditional bricks required 20mm
Sir, what will it cost for installing a plant for manufacturing of AAC blocks? Plz inform me.
it depends on ur region. governments has there own set of guidelines to follow while installing a plant. So i cant give u a perfect figure for this
Can be use AAC block in sub structure.
AAC blocks are not recommended in substructure
What is the size of AAC block?
Is it plastering necessary over the ACC wall.. bcoz the accuracy of the construction is 99% so the remaining one percent we can manage through applying putty or pop punning etc..