AAC Block advantages and disadvantages, hi guys in this article we know about AAC Block benefits, AAC Block advantages and AAC Block disadvantages. Today in construction industry use of AAC Block replace the traditional red brick.
Full form of AAC block is utoclaved Aerated Concrete (AAC), it is also known as Autoclaved Cellular Concrete (ACC) and Autoclaved Lightweight Concrete (ALC). It is building material invented in the mid-1920s that simultaneously provides sound proof structure, insulation, and fire and mould resistance.
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ACC block is Autoclaved aerated concrete. It is a lightweight, precast, foam concrete building material suitable for producing concrete masonry unit (CMU) like blocks. It is composed of quartz sand, calcined gypsum, lime, cement, water and aluminum powder.
Autoclaved Aerated Concrete is an eco- friendly and certified green building material which is lightweight, load-bearing, high- insulating.
Meaning of AAC block is its products are cured under heat and pressure in an autoclave and there is presence of air in the mixture of ACC block and hard bearing good compressive strength like concrete that why it name is AAC block (autoclaved aerated concrete).
AAC is a highly thermal insulating concrete based material used for both internal and external construction and are Light weight, Energy efficient, Fire and Sound Proof, Easy to install, handling and Environmentally certified Green concrete product as it is also Ecological and Recyclable product. Higher Strength to Weight Ratio, Seismic Resistance, Precision, Breakages.
AAC Blocks are unique and excellent type of building materials offers ultimate good workability, flexibility and durability. AAC has excellent thermal insulation and acoustic absorption properties. It is fire and pest proof resistant, and is economically and environmentally superior to the more traditional structural building materials such as concrete, wood, brick and stone.
AAC Blocks in the name of concrete are manufactured using the finest grade (Class F) fly ash,gypsum based and other raw materials.
AAC block Advantages & properties
Let us now discuss about AAC Block advantages, benefits and their different properties and uses.
◆ 1) AAC Block Autoclaved aerated concrete.
◆ 2) it is lightweight,precast, foam concrete building material suitable for concrete masonry unit.
◆ 3) it is eco friendly in nature not producing pollution in environment and it is certified green building material.
◆ 4) it is load bearing in nature having high compressive strength 5N/mm2
◆ 5) it is also fireproof insaluting building material having a resistance of about 4 an hour against fire.
◆ 6) actually it is aerated concrete have more air voids, due to presence of air void in between that’s why it is lightweight and easy for handling even it has high volume.
◆ 7) there are different size of AAC Block are available in market, but there are four common size are 600mm × 200mm × 100mm,600mm × 200mm × 150mm,600mm × 200mm × 200mm and 600mm × 200mm × 225mm.
◆ 8) water absorbing capacity of AAC Block are about 10% of their weight
◆ 9) there are three class of AAC Block, dry density of first class AAC blocks are 651 – 750 kg/m3, 2nd class dry density is 751 – 850 Kg/m3 and 3rd class dry density is 851 – 1000 Kg/m3. And wet density of 1st class is about 700 -800 Kg/m3.
◆ 10) It is composed of quartz sand, calcined gypsum, lime, cement, water and aluminum powder.
◆ 11) AAC blocks provide greater insulation against sound out loud noises and providing good insulation.
◆ 12) AAC Block are light weight and durable and can withstand extreme earthquake condition.
◆ 13) AAC blocks are easier to use in the construction process and save time as well as money for contractor and owner like. Due to presence of air in mixture AAC blocks and light, yet strong due to the process through which they are created.
◆ 14) AAC blocks made in uniformly and can be cut and shaped according to required in construction. it provide greater insulation against heat since they do are not good conductor of heat. The technology used in creating AAC blocks ensure that is blocks are resistant to fire.
◆ 15) More carpet area is available in built up area due to lesser widths of walling and cladding with 100/150 or 200mm against in case of conventional brick masonry.
◆ 16) Fast returns on investment due to speedy construction, saving in Cement, Steel construction supervision cost, construction time, water requirements for construction, timber required for centering /shuttering etc.
◆ 17) Uniform quality due to mass production in the factory. Due to high insulation properties of Autoclaved Aerated Concrete, there will be substantial saving in installation and recurring cost of air conditioning units.
◆ 18) AAC Blocks are wire cut & are having plain surface. In view of this, the Plaster for internal walls is not required & directly Putty & Painting can be done, saving the plastering cost. However, External Plastering is recommended for AAC Blocks.
◆ 19) Due to Light Weight and Earthquake resistant also comfortably worked and highly insulating and less water penetration and environmental friendlily also fire resistant and incombustible.
AAC block disadvantages
Disadvantages of AAC Blocks are following:– AAC blocks have brittle nature; therefore, they require more care than clay red brick during handling and transporting. The cost per unit of AAC block is high, but overall, masonry cost is low because it requires less cement mortar for installation.
What are the disadvantages of AAC blocks?
AAC blocks are formed by pouring foam concrete into a mould then setting them until the desired strength is attained. To understand AAC blocks one must understand the basics of foam concrete. It is formed by adding a foam (something similar to the shaving foam we use) to a cement-flyash slurry.
Any synthetic foaming agent has a max stand time of 2 hours before the foam starts collapsing. Therefore the mix design should set within before 1.5 hours and harden sooner else the concrete will simply collapse. To entrain foam into the slurry the mixture should have a water content of atleast 50% else.
Some of the Main Disadvantages of AAC Blocks are given below:-
1) AAC Block is Non load Bearing material, it can be used only in wall partitions.
2) AAC block is brittle in nature that means It can break easily. Presence of voids makes it brittle in nature.
3) Their water absorption is very high. With this their expansion on absorbing water and contraction on loosing moisture bring cracks in structure.
4) If installed in high humidity environments, interior finishes require low vapor permeability and exterior finishes require high permeability.
5) Very few contractors who are familiar with AAC Block but now a days it is increasing day by day.
Let us now discuss AAC Block disadvantages, brittle nature, handling,fixing and installation drawbacks.
● 1) Brittle nature: it has some brittle nature ,they need to be handled more carefully than clay bricks to avoid breakages.
● 2) Fixings: the brittle nature of the blocks requires longer thinner screws when fitting cabinets and wall hangings and wood-suitable drill bits or hammering in.
● 3) Special, large diameter wall plugs are available, though at a higher cost than common wall plugs.
● 4) Insulation requirements would require very thick walls when using AAC alone. Thus many builders choose to return to traditional building methods installing an extra layer of insulation around the building.
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