Autoclaved aerated concrete (“AAC”), is currently one of the many building products being touted as “green” or “environmentally friendly.” This paper briefly examines the building durability requirement with AAC, paying particular attention to the aspects of the product that may lend to its designation as a sustainable building material.
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The lightest masonry material available in today's market is AAC blocks (Autoclaved Aerated Concrete Blocks) whose density is about 1/3 rd times of the clay bricks and fly ash bricks and about 1/5 th times of the Concrete because of its foam-like structure made up of 80% of air voids while they are being used since the 1920s in most of the part in Europe still many are not accepting them in countries like India and America. Due to its lightweight and great thermal resistance, it is gaining popularity all across the world but not only it is gaining popularity because of its engineering properties but also because it is an eco-friendly product which is why even government and other organizations are promoting its usage. But this lightweight eco-friendly product is also economic as even after the initial costing is higher than clay bricks but its light weight causes the reduction in dead weight around 1/3 rd times hence the total project cost decreases by 15-30%.
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Review of Autoclaved Aerated Concrete: - Advantages and Disadvantages
As the name suggests light weight concrete blocks are light in weight as compared to our convectional concrete blocks. Lightweight concrete is a concrete which includes an foaming agent in it that increases the volume of the mixture while reducing the dead weight.This concrete has its advantages of higher strength for unit weight, better tensile strain carrying capacity, lower coefficient of thermal expansion, and better heat and sound insulation characteristics due to air voids in the concrete. Autoclaved Aerated Concrete block is a present time green building material in India which is used as a substitute over conventional red clay bricks in residential, commercial and industrial construction activities.AAC block is a light weight precast building material that provides construction economy. It is an eco-friendly product, as it is manufactured using 60-65% of fly ash, which is nothing but just an unavoidable waste from coal based thermal power plants. Being bigger in size than clay brick, AAC wall construction involves less joints.It provides us with minimal wear and tear over prolonged use along with minimum maintenance due to weathering. AAC blocks require substantially less of surface treatment.this paper represent reviews on AAC block and its material.
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This type of lightweight concrete has no coarse aggregates in its mixture, and it can be mentioned that aerated lightweight concrete is the concrete mortar which is aerated with gas injection and also can be aerated by using air entraining agent. Aerating concrete by using air entraining agents is more practical in production of LWC. Fine aggregates that can be used to produce aerated concrete are known to be silica sand, quartzite sand, lime and fly ash. Considering methods of curing, aerated concrete can be categorized into two main groups which are autoclaved aerated concrete and non-autoclaved aerated concrete. Curing is an important factor affecting mechanical and physical properties of concretes in different categories. According to different reports, AAC can reach higher strength values with less drying shrinkage when it is compared to non-autoclaved aerated concrete (NAAC). Therefore, it can be concluded that autoclaving process has beneficial effects on strength development and also on shrinkage of aerated concrete. Autoclaved Aerated concrete (AAC) has many benefits for structures such as heat insulation, sound insulation, fire and mould resistance, reduced dead weight and many more. AAC products include blocks, wall panels, floor and roof panels, and lintels. Besides insulating capability, one of AAC's advantages in construction is its quick and easy installation since the material can be routed, sanded and cut to size on site using standard carbon steel band saws, hand saws and drills.
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International Journal for Research in Applied Science & Engineering Technology (IJRASET)
Autoclaved aerated concrete (AAC) has many benefits for structures, such as heat insulation, sound insulation, fire resistance, reduced dead weight, and many more. AAC products include blocks, wall panels, floor and roof panels, and lintels. Besides its insulating capability, one of AAC's advantage in construction is its quick and easy installation since the material can be routed, sanded, and cut to size on-site using standard carbon steel band saws, hand saws, and drills. Although AAC has been produced for many years, there are still some points that need to be clarified. One of these points is the effect of humidity intrusion on AAC members in areas with high relative humidity levels, like Mediterranean climates. Therefore, various tests associated with the mechanical and physical properties of AAC concrete should be carried out, particularly Compressive Strength test in order to assess the strength of AAC blocks. The current project intends to analyse the physical and mechanical properties of autoclaved aerated concrete blocks at three different curing conditions using an accelerated curing tank to compare the effects of curing on the properties of AAC.
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Autoclaved Aerated Concrete Blocks have many advantages compared to traditional concrete blocks like advanced strength to weight ratio, lower Coefficient of thermal expansion, good sound insulation as a result of air-voids within it. The literature review offers info on the work done on the various properties of AAC and also the results obtained thereby. Finally the cost effectiveness and eco-friendliness like advanced strength to weight ratio, lower Coefficient of thermal expansion, good sound of AAC has been mentioned.
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Journal of Building Materials and Structures
The traditional bricks are the main building materials that are used extensively in the construction and building industry. Autoclaved Aerated Concrete blocks are recently one of the newly adopted building materials. The Autoclaved aerated concrete (AAC) is a product of fly ash which is mixed with lime, cement, and water and an aerating agent. The AAC is mainly produced as cuboid blocks and prefabricated panels. The Autoclaved aerated concrete is a type of concrete that is manufactured to contain lots of closed air voids. The AAC blocks are energy efficient, durable, less dense, and lightweight. It is manufactured by adding a foaming additive to concrete in different sizes of molds as per requirement, then wire-cutting these blocks or panels from the resulting 'cake lump' and 'heating them with steam. This process is called as Autoclaving. It has been observed that this material is an eco-friendly building material that is being manufactured from industrial waste and is composed of non-toxic ingredients. In this paper, an overview of AAC blocks with reference to its potential and sustainability as a novel building material has been presented. The paper also presents a comparative cost analysis of AAC Blocks with the Red clay bricks and its suitability and potential use in the construction in the building industry.
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