Ytong is the worlds largest manufacturer of aerated concrete blocks and the only company in greece that produces autoclaved aerated concrete blocks. In addition, hebel is energy efficient, fire resistant and long lasting, which, over time, will. Autoclaved aerated concrete aac is a lightweight concrete building material cut into masonry blocks or formed larger planks and panels. Just as aercon floor panels provide superb fire resistance, so too do aercon roof panels. The bulk density of steamcured aerated concrete is within the range of 300 to kgm 3. Developed in sweden in the 1920s in response to increasing demands on timber supplies, aac is a lightweight manufacture. Composed of quartz sand, calcined gypsum, lime, cement, water and aluminum powder, aac products are cured under heat and pressure in an autoclave. Aac blocks needs steam for getting cured whereas clc blocks cures naturally, they are made by using zero energy, only energy running for a mixture machine is used. Aerated concrete block acb, initial rate of absorption ira, dry density. Typical properties of aerated concrete high pressure steam. Autoclaved aerated concrete aac is manufactured from cement, sand silica, lime and. History of autoclaved aerated concrete the short story of a long. Brick and block production mortar industry association.
Panels are available in thicknesses of between 8 inches to 12 inches and 24 inches in width, and lengths up to 20 feet. Though it is called aerated concrete it is really not a concrete in the correct sense of the word. Autoclaved aerated concrete is a versatile lightweight construction material and usually used as blocks. Cellular light weight concrete clc and autoclaved airated concrete aac are basically the same, with the difference of how these are cured. Aac is environment friendly with added properties like light weight, fire resistant, sound proof, earth quake resistant and cost saving. To have full control over the aeration of your concrete, mix it yourself from scratch.
I tried several time to fix it, either with the proper aerated autoclaved concrete putty and with stucco but, after some days, the crack comes back again. Material specifications for aac are prescribed in astm c86. Fire resistance aercon aac autoclaved aerated concrete. Autoclaved aerated concrete blocks are the lightweight block materials made by proportioning calcareous materials cement and lime, siliceous materials sand, slag and fly ash and air entraining admixture aluminum powder, and then mixing, casting, gasdeveloping, cutting and autoclaving them. Conquering brick by brick 3 although aac block has been in use long globally,since the aac block is an emergingproduct and a growing industry in india. Table 2 shows the properties of some of the aerated autoclaved concrete blocks that were made.
The most common dry densities for loadbearing products and reinforced aacelements are 400 kgm 3 and 500 kgm. Autoclaved aerated concrete block pioneers in the industry, we offer magic blox aac wall blocks, magicblox grade 1 aac blocks, magicblox environmental friendly aac blocks, magicblox autoclaved aerated concrete block, magicblox isi certified aac blocks and magicblox thermally insulated magicrete aac blocks from india. The autoclaved aerated concrete products are made of quartzite, cement, lime, gypsum, aluminium and finally recycled waste slurry closedloop. After that, the aerated concrete blocks are transported to the block transfer device 12 and placed on wooden pallets. Aac block plant autoclave aerated concrete aac production. Durox supabloc aerated concrete blocks by tarmac durox is a modern construction material, whose versatility, light weight, thermal and acoustic properties make it the ideal solution for a wide variety of applications in all types of building.
Pdf autoclaved aerated concrete aac is an ultralight concrete masonry product. Autoclaved aerated concrete masonry units aac are ultra lightweight concrete blocks with a unique cellular structure that provides superior energy efficiency, fire resistance and acoustical properties. Please address all correspondence to the chief executive. Aerated concrete block, also referred to as autoclaved aerated concrete or aac, is an innovative type of concrete containing around 80 percent air. Theyre strong, light and provide better sound and thermal insulation than conventional blocks. Aerated concrete is either a cement or lime mortar, classified as lightweight concrete, in which airvoids are entrapped in the mortar matrix by means of a suitable aerating agent. Autoclaved aerated concrete aac is made from sand, lime, cement, water and aluminium powder acting as a foaming agent to form homogenous cellular structure, known as calcium silicate hydrate. Autoclaved aerated concrete aac is a lightweight, concrete like material with many small, closed internal voids. Autoclaved aerated concrete aac blocks project brief report free download as pdf file. Mar 09, 2015 clc blocks conserves environment far more than aac blocks. Autoclaved aerated concrete shaft walls, applied in 1step, replace 3step gypsum walls. Cured blocks or panels of autoclaved aerated concrete are joined with thin bed mortar.
Toplite standard aerated concrete blocks by tarmac toplite is a versatile aircrete material which is able to provide solutions below ground in foundation walls, in suspended beam and block floors and all types of internal and external walling situations. The change in alumina powder content gave a magical change to the strength and density. Autoclaved aerated concrete aac, is one of the many building products being touted as green or environmentally friendly. Aac block is used in a wide range of commercial, industrial and autoclaved aerated concrete aac blocks project brief report download as pdf file. Structural design aercon aac autoclaved aerated concrete. For insulation, lightweight filling, replacement to brick bat. Lighter, more fireresistant, and a better insulator, autoclaved aerated concrete caught on in the rest of the world ages ago. In order to promote public education and public safety, equal justice for all, a better informed citizenry, the rule of law, world trade and world peace, this legal document is hereby made available on a noncommercial basis, as it is the right of all humans to. Aac typically weighs onesixth to onethird as much as conventional concrete, and is about onesixth to onethird as strong. Pdf in this study, the use of autoclaved aerated concrete aac as an in fill material for semi precast panel is investigated experimentally.
Autoclaved aerated concrete aac, a form of cellular concrete, is a lowdensity cementitious product of calcium silicate hydrates in which the low density is obtained by the formation of macroscopic air bubbles, mainly by chemical. The fraction of pore volume in aac products covers the range from 65 to. Cured blocks or panels of autoclaved aerated concrete. As a result, the sound insulation performance of aerated concrete walls of lower and higher density had to be examined. The technical data sheet and sample provided revealed that the item is a white cement block. Nonautoclaved aerated concrete made of modified binding. We have moved from qwerty to touch, from head pans to concrete pumps and from clay bricks to aerated blocks. The item is made of articles of cement, of concrete, which is lightweight concrete. It can weigh as little as 15 as much as ordinary concrete due to. Introduction and overview concrete is the most widely used building material in the world. We develop machinery for aac blocks, plant for aac block manufacturing and automatic aac block machines with our new technology in manufacturing, which meet the specific requirements of market and consumers. Our prototype is a nonautoclaved, aerated concrete naac with two main benefits. Autoclaved aerated concreteis classified as nondangerous goods. The low density is achieved by the formation of air voids to produce a cellular structure.
Departmentofcommerce nationalbureauofstandards nationalengineeringlaboratory centerforbuildingtechnology. Blocks come in lengths of 24, 32, and 48 inches, and thicknesses of 4 to 16 inches. Concrete blocks advantageous properties are reflected in their myriad of variations of strength, insulating and soundreducing properties. Simultaneously, there has been a very significant change in the replacement of burnt clay bricks by concrete masonry units. Forterras aircrete blocks are stocked by a large network of builders merchants across the uk, ensuring easy availability. Near the end of world war ii, aac became widely used. Standard specification for autoclaved aerated concrete aac. Autoclaved aerated concrete aac blocks project brief report. However, walls made of aerated concrete blocks typically have relatively high sound insulation performance in tongue and groove joints, which can be attributed to the porosity of aac. It is lightweight and energy efficient and is produced by adding a foaming agent to concrete and cooking it with steam autoclaving, after which blocks or slabs are wire cut from the resulting. Aerated concrete is made by introducing air or gas into a slurry composed of portland cement or lime and finely crushed siliceous filler so that when the mix sets and hardens, a uniformly cellular structure is formed. Autoclaved aerated concrete aac or aircrete is a popular building material that draws its roots from the. Toplite standard aerated concrete blocks by tarmac. The hardened aerated concrete cakes are then transported to the retilting table 10 and to the separating machine 11, if required.
Sometimes the components of concrete will dictate how much air can be added to the mixture. Porous concrete, especially aerated autoclaved concrete aac was first developed by a swedish engineer between the years 1920 and 1932 1. Broadly speaking aerated concrete falls into the group of cellular concrete microporite being the other. Concrete blocks brochure 23rd march 2015 riba product selector. Lightweight aerated concrete lightweight concreteaac blocks. Oct 26, 2015 autoclaved aerated concrete aac block is a building material made of portland cement, fine aggregates fly ash or sand, water and an expansion agent in an autoclaving process heated under pressure which results in the production of air voids in the material, making it less dense, easy to cutmould and better insulating. Airtec blocks airtec aerated blocks have a plainfaced, smooth, cellular texture which is a suitable background for accepting renders and plasters. A comparative analysis burnt bricks versus autoclaved aerated concrete blocks parameter burnt clay bricks aac blocks remarks 1 from thermal plants. Autoclaved aerated concrete aac blocks project is agreen project in terms of profitability and sustainability. The extensive product range means that a variety of tried and tested, costeffective solutions can be offered for wall, floor and belowground constructions. Standard aerated concrete blocks have a thermal conductivity of about 0. It appears that the usage of aerated concrete block masonry may become more common in the coming years. Tests on aerated concrete blocks here, an attempt has been made to compile the information on the absorption characteristics, wet compressive strength and density of aerated concrete blocks and strength and elastic properties of aerated concrete block masonry. Nabil taha has over 27 years of structural engineering experience.
Autoclaved aerated concrete aac blocks are used in the same kinds of applications as. Some call autoclaved aerated concrete aac a nearperfect building material. A performance analysis of autoclave aerated concrete. These special concrete blocks have a number of advantages. Autoclaved aerated concrete aac, aircrete autoclaved aerated concrete is a versatile lightweight construction material and usually used as blocks. The leading manufacturer of precast autoclaved aerated concrete products. When concrete products are cut, sawn, abraded or crushed, dust is created which contains crystalline silica, some of. With decades of experience in serving the aac blocks production machinery industry, we can supply customers with quality aac block production lines with capacity ranging from 80,000m 3 to 40,000m 3 per year. Aac belongs to the group of porous steamhardened lightweight concrete. Aerated concrete block acb, initial rate of absorption ira, dry density, compressive strength, modulus of elasticity, shear strength, flexural strength. Autoclaved aerated concrete block magic blox aac wall.
In order to promote public education and public safety, equal justice for all, a better informed citizenry, the rule of law, world trade and world peace, this legal document is hereby made available on a noncommercial basis, as it is the right of all humans to know and speak the laws that govern them. Hebel aac autoclaved aerated concrete provides masonry solutions to increase speed of construction and performance. Patented in 1924 by a swedish architect, aac is made of common ingredients. Mukund joshi, technical adviser, godrej tuff blocks. It was shown that the sound insulation performance could be expected to be slightly higher for densities. I got an everlasting problem with a aerated autoclaved concrete also known as gasbeton wall.
Pdf an overview of advantages and disadvantages of. Both aac and clc blocks are made using cement, flyash, sand and foaming agent. The raw materials of the aac block is flyash, cement, aluminumpowder, gypsum, lime. Ac has the advantage that it can be shaped with saws, files and rasps. Currently it has not seen widespread use in the united states. Pdf aerated concrete ac has many benefits for structures such as heat. Preparation and properties of porous aerated concrete. Autoclaved aerated concrete aac is a lightweight, precast, foam concrete building material suitable for producing concrete masonry unit cmu like blocks. Prior to opening his own engineering firm in oregon in 1997, he was a professor of engineering at northern montana state university and at oregon institute of technology.
Autoclaved aerated concrete shaft walls, applied in 1step. Initial rate of absorption initial rate of absorption test was conducted. Autoclaved aerated concrete blocks are need of the time. Aac blocks offer superior performance and reduced project cost. The lightest masonry material available in todays market is aac blocks autoclaved aerated concrete blocks whose density is about rd times of the clay bricks and fly ash bricks and about 15 th times of the concrete because of its foamlike. Pdf composite aerated concrete and ferrocement lightweight slab. Apr 21, 2017 autoclaved aerated concrete aac is formed with excellent aggregates, cement, a growth agent that causes the contemporary combination to rise like dough. The aac production process includes raw material preparation, batching and mixing, pouring, pr e curing, cutting, autoclaving, and packing. In common with all aerated concrete products in the uk, the surfaces of the blocks may contain a random amount of larger cells due to an unavoidable consequence of the manufacturing process. The porous aac structure comes from being leavened with aluminum. Autoclaved aerated concrete aac block machine equipments and manufacturers build it strong. Hebel aerated concrete provides contractors with strong, easytoinstall blocks and reinforced panels that are onethird the weight of traditional concrete and replace traditional multistep construction processes. Some concrete needs to be lighter and less dense and will require more air, while concrete used for very solid structures, like foundations, should have less.
Our group of 8 concrete block manufacturing plants are located across the. Compressive strength, modulus of elasticity, shear strength, flexural. Noaina hassan khantanzeel ahmed reema khan nadia ali atia khursheed 2. Litebuilt aerated concrete, lightweight concrete, cellular concrete and foamed concrete for lightweight panels, blocks, floor screed, roofing, etc. The products referred are blocks of various formats made of autoclaved aerated concrete aac. Units of autoclaved aerated concrete aac are most commonly laid using thinbed mortar and can be used for bearingwall masonry. This time, the tests involved aerated concrete walls of approx. Technical design manuals we would be happy to provide aac design manuals to your architect. In use from the 1940s onwards, dense aggregate blocks are very much the workhorse of the construction industry.
Technical manual aercon aac autoclaved aerated concrete. Currently, aac products are manufactured in more than 40 countries and are used in more than 70 countries. Construction details aercon aac autoclaved aerated concrete. Trenchblock, general purpose, autoclaved aerated concrete. Using autoclaved aerated concrete correctly masonry magazine. Though history records the use of concrete blocks by the romans, greeks and even egyptians some of the twotonne blocks that make up the pyramids are believed to be a primitive form of concrete, moderntype blocks were first cast, albeit in modest quantities, in around the middle of the nineteenth century. Aac installation and construction services we are the largest, most qualified aac contractor in the southwest. Our longterm policy of continuous innovation and the uncompromising application of futureorientated technologies are what help maintain ytongs current position as a major supplier to the. Materials, production, properties and application of aerated.
In fact, this sort of concrete contains eighty % air. He was searching for a material with the properties of wood, but without the disadvantages of wood. Whether the fire is above or below the roof, aercon roof panels provide the peace of mind that your structure is fire resistant. Sound insulation performance of aerated concrete walls. Klingner closeup view of autoclaved aerated concrete showing small, closed voids. This paper is attention to classified of aerated lightweight concrete into foamed concrete and autoclaved concrete. Manufactured and installed just like floor panels, aercon roof panels have a 4hour fire resistance rating per ul p932. Autoclaved aerated concrete aac blocks project is agreen project in. The low density is achieved by the formation of air voids to produce a cellular.