Transcription
HebelAutoclaved Aerated Concrete (AAC)
Courtesy Hebel: AustraliaEverite Building Products,the Xella Group and HebelEstablished in 1941, Everite Building Products,All the benefits withone productSpeed of Construction2-10 x faster thanconventional buildingTechnical PerformanceFire / Thermal / SoundContractor FriendlyStandard masonry skillsCost Effective3renowned for its range of Nutec Fibre Cementroofing, ceilings and cladding materials and hasover the years been recognised for its role in33Advanced Building Technology (ABT) systems.The success and experience gained in ABT has led to the appointmentof Everite Building Products as a licensee of Hebel AutoclavedAerated Concrete by the Xella Group. Everite Building Products is the3only producer of AAC in Africa.AAC as a building material has gained a considerable share of theinternational construction market since its inception in the 1920’s inCourtesy Hebel: AustraliaSweden. Today it maintains its reputation of the building material ofthe future. It is viewed as a revolutionary material that offers a uniquecombination of strength, light-weight, thermal insulation, soundabsorption, unsurpassed fire resistance and unprecedented ease ofconstruction.Fire resistantThermalinsulationSoundinsulationEase of use andworkabilitySpeed ofconstructionLow carbonfootprintLow heating andcooling costsLightweight andstrong1
Hebel the productComposition and manufacturing processAutoclaved Aerated Concrete (AAC) is made fromsand, lime, cement, water and aluminium powderacting as a foaming agent to form a homogenouscellular structure known as calcium silicate hydrate.BenefitsOne quarter the weight ofconventional concrete E xtremely stableSuperior technicalperformance characteristicsThis porcelainic reaction results incuring in autoclaves for up to 12a unique and extremely stablehours. It is this autoclaving processtobermorite chemical structure.that gives this material its unique andThe mixing results in a chemicalsuperior performance characteristicsreaction which expands the mixtureover any other.to form small, finely-dispersed airspaces. The mix is poured intoHebel reinforced elements, such asmoulds and allowed to set for a fewslab panels and wall panels, containhours while the chemical reactionspecially coated steel to preventcontinues.corrosion and gives the material bothdimensional accuracy and stability.Autoclaves at Everite Building Products in theprocess of being commissioned. Green AACblocks and panels are fed into autoclave forhigh pressure steam curing.The semi solid material is removedThe steel reinforcing is placed in thefrom the moulds and then cut tomoulds before the mix is added. Theshape in various lengths and profiles.manufacturing process is then theThe final phase in the productionsame as described above forprocess is high pressure steamunreinforced elements.Close-up view of aerated autoclaved concrete - a homogenouscellular structure known as calcium silicate hydrate. Theseminute cells give the material its light weight and high thermalinsulation properties.Hebel is a lightweight autoclaved aerated concretewhich is completely cured, inert and stable form ofcalcium silicate hydrate. It is a structural material,approximately one quarter the weight of conventionalconcrete, composed of minute cells which give thematerial light weight and high thermal insulationproperties. It is available as blocks and pre-castreinforced units, i.e. floors, roofs, walls and lintels.Hebel Block. Each block is perfectly sized and on-site cuttingduring the building process is kept to a minimum. The naturallysmooth surface of Hebel only requires a skim coat finish andeliminates the need to plaster conventionally. Although a 10 mmconventional plaster can be done, internally walls only require agypsum skim coat23
HebelGreen PropertiesFeatures and BenefitsManufacturing TransportationThe following impressive attributes of AAC make Hebel an innovative,AAC has been produced for more than 70 years, and it offers several significant advantages over other masonrysustainable and proven building material and are summarised by theTechnical Performancematerials, one of the most important being its lower environmental impact.following qualities:High speed of constructionfor an economical building processHebel panels are faster to construct and require significantly lesslabour when compared to traditional masonry construction techniquesleading to substantial savings and reduced on-site costs dependingon finish required.Building with Hebel also means a cleaner safer work areaduring construction and less clean-up at completion of building.The modular size and light weight propertiesof AAC block is perfect for pallet stacking from factory to site.Mechanical handling of AAC block.Suitable for use up to 4 stories high.Fast installation and easy workability with simple tools resultManufacturingin lower construction costs.Can be cut and shaped like wood with simple hand tools.Chasing of walls can be done by hand or with a wood router.During the manufacturing process of AAC blocks, waste from theSmooth finish can substantially remove plastering trades.cutting process is recycled back with raw materials and used again.Manufacturing of AAC Blocks consumes approx. 70% less energyLoad-bearing capacitywhen compared to the manufacturing process of clay brick.for the most unexpected situationsReference:Being a masonry product, Hebel blocks and panels provide theInternational Journal of Engineering Research & Technologyattributes of being solid, strong and secure - all of these normallyonly associated with traditional bricks. Our 600 kg/m3 density product has aPerfect internal climate control no matterwhat the weather does outside.ISSN: 2278-0181www.ijert.orgIJERTV3IS110454Vol. 3 Issue 11, November-20145 MPa compressive strength and is rated for building up to 4 stories and inearthquake zones due to its high strength to weight ratio.Outstanding fire resistancefor maximum protection and safetyNon-combustible and renowned for its highly fire resistant properties.For example, a 150 mm thick AAC Hebel wall withstands direct fire exposurefor up to 6 hours.TransportationAAC travels further - more square metres of walling per load.The lightweight and size characteristics of AAC block allowsfor reduced transport costs when compared to conventional brick.Technical PerformanceA standard 100 mm thick Hebel wall can withstand temperaturesThermal: allows the interior to remain cool in summer andfor 4 hours.warm in winter.Thermal insulation in winter and summerfor long-term reduction in energy consumptionThe enhanced insulation performance is 5 times that of brick of the same thickness.The thermal efficiency reduces the reliance on heating and cooling appliances, and150 mm panel U - value of 0.85 W/m2K R - value of 1.17Sound:100 mm panel Rw 40 dB150 mm panel Rw 46 dBprovides up to 60% reduction in heating and cooling costs.45
Cost effective building materialHebel ToolboxNetherlands: Architects officesCircular saw.Hand saw.Hand-held conduit chaser or router.Wall panels laid horizontally, cut to size atfactory, on site cutting minimal and can bedone with circular or band saws.Wave nail.Easy to nail.Adhesive applicator.Easy to screw in without pilothole or plug yet retainexceptional pull out strength.The cost of Hebel panels and blocks are only a partof life cycle costing of a building. When factors suchNetherlands: Shopping centre in Amsterdamas transportation (Hebel is light weight) assembly,and finishing, as well as the energy efficiency, fireprotection, maintenance, durability and environmentalproperties are considered, Hebel provides aneconomical solution for the lifespan of the building.Savings of up to 15% inReduced wall thickness withstructural costs (foundationscommensurate performanceand structure) attributable toproperties.low mass to strength ratioproperties of AAC.Reduced weight of walls:Typical brick and mortar wallload is approx. 350 kg / m2.AAC blocks wall load isapprox. 90 kg / m2.Improved labour and timesavings.Improved transport costsreduction.Improved reduction of waste.Improved plastering (less wastedue to uniform surface).6Dual purpose fire escape and acoustic barrierto freeway noise7
Quick FactsCertificationSpeed of building comparisonHebel SizesCertificationBlocks: SANS 50771-4:2014/EN 771-4:2011Specification for masonry units - Part 4: Autoclaved aerated concrete masonry units.Specifies the characteristics and performance requirements of autoclaved aerated concrete(AAC) masonry units for which the main intended uses are types of load bearing and non-loadbearing applications in all forms of walling.Panels: EN12602.Agrément Certification: 2016/509Rational Design on request.Speed of building comparisonConventional brickwork is normally done by a two man team (bricklayer and helper).Building with AAC blocks using a two man team is twice as fast compared to building withconventional brick.Building with AAC panels using a four man team is 10 x as fast compared to building withconventional brick.Further advantages of HebelHebel Block Sizeinclude much faster and neater600 x 250 x 110 mm (Mass 10.2 kg)chasing for electrical and plumbing600 x 250 x 150 mm (Mass 15.2 kg)During construction:6th day into constructionfixtures with a wood router or holesaw. This is unlike for brickworkHebel Panel size (600 mm width)where hammer and chisel isThickness: 100 mm; 150 mm.necessary to complete the job.Length: 2400 mm; 2700 mm; 3000 mm.Finishing: Conventional brickworkrequires plaster and skim coat for aSpecial sizes on request.Windows / Door panelsperfectly smooth finish whereas theextra naturally smooth surface ofHebel only requires a skim coat.During construction:9th day into construction.Decorative detail createdby cutting and gluing AACto structure.Carribean Villa :3rd week of construction89
AAC in AfricaAngola: Project size 45000 units.Work in progress.Installation of slab.Everite Building Products (Pty) Ltd.0861 333 835 27 11 439 4400www.everite.co.zaHebel is a registered trademark of the Xella GroupInterior.
Hebel Block. Each block is perfectly sized and on-site cutting during the building process is kept to a minimum. The naturally smooth surface of Hebel only requires a skim coat finish and eliminates the need to plaster conventionally. Although a 10 mm conventional plaster can be done, internally walls only require a gypsum skim coat 2 3
