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Designing and Building with Aircrete - 36 Pages

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Catalogue excerpts

Designing and Building with Aircrete Build with ease

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Contents Structural Design Foundation Blocks External Walls Internal Walls Movement Control Regulations (acoustics) Acoustic Compliance Robust Details for Acoustic Compliance Fire Resistance Good Site Practice External Applied Finishes Internal Applied Finishes Wall Fixings Aircrete /aerkri:t/ noun., adj. 1. autoclaved, aerated concrete (AAC) 2. (cel)lular (con) crete (CELCON). One of the lightest forms of concrete with structural, thermal, sound, fire and freeze/thaw properties, extensively used in Europe where known as ‘gasbeton’. Used in the UK since the 1950s; today known as ‘aircrete’. Comprises...

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Introduction In this guide we have brought together the two areas for using aircrete, the Design process and Building. The first section looks at the Design elements needed to create successful masonry structures and the second how to Build successfully. Designing with Aircrete This has been written to help architects and specifiers achieve the most efficient designs using H+H UK products, whether for low-rise housing or multi storey buildings. There is detail on Structural Design when building Low Rise Housing (up to three storeys), designing with higher strength blockwork and Eurocode 6. Also...

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Designing with Aircrete Structural Design Design of Low Rise Housing The following documents set out simple design guidance for low rise housing: These give block strength requirements for certain types of buildings in accordance with European Standards. H+H products are manufactured to meet the requirements of the above documents. he Building Regulations T Approved Document ‘A’ for England and Wales. mall Buildings Structural S Guidance document for the Building (Scotland) Regulations. BS 8103-2 (Structural design of low rise buildings – Part 2 Code of Practice for Masonry Walls for housing). The...

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H+H aircrete can be used where 2.9N/mm blocks are shown (drawing 1) and blocks from the higher strength grades range can be used at the lower storey of a three-storey building. It should be remembered that structural calculations can still be carried out, which may lead to a more economical solution. 2 Where the layout of the dwelling is outside this guidance or it is greater than three storeys, a structural design calculation is necessary. The requirements for disproportionate collapse effectively limit masonry constructions to four storeys. Aircrete can of course be used for infill blockwork...

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Designing with Aircrete Structural Design continued Design to EC6 Given the vast array of different materials, sizes and shapes of units available across Europe, it was decided when developing EC6 that a single formula approach would be more viable than a tabulated one. However, in order for this to work, the compressive strength of each unit would have to be standardised or ‘normalised’ The normalised . mean compressive strength, fb, used in EC6 is the compressive strength of an air dry 100mm cube of a masonry unit. Normalised compressive strength, fb, of blocks The normalised compressive strength...

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Table 3 Characteristic Compressive Strength, fk, of Masonry (to EC 6) for H+H Aircrete Blocks in N/mm² Designation (iii) / M4 Mortar (K = 0.75, α = 0.7, β = 0.3, fm = 4N/mm²) Block Type (declared compressive strength, N/mm²) Celfix Thin Layer Mortar (K = 0.9, α = 0.85, β = 0, fm = 10N/mm²) Block Type (declared compressive strength, N/mm²)

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Designing with Aircrete Structural Design continued Characteristic flexural Strength of Masonry The design for lateral load in EC 6 is based on UK design practice and is similar to BS5628:Pt 1 with the values for characteristic flexural strength in the National Annex being identical to the values BS5628. Interpolated figures relevant to H+H aircrete are given in Table 4. produced to BS EN 998-2 which enables the utilisation of special category of construction control (Class 1 execution control in EC6). These two factors combined mean that a reduced partial safety factor, γm, of 2.5 (BS 5628:Pt1...

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Table 5 Partial Safety Factors for Material Strength γM from BS5628:Pt 1 Table 4 Grade of H+H Aircrete Category of Manufacturing Control Category of Construction Control Traditional Mortar Special Super Strength Super Strength High Strength High Strength Thin Layer Mortar * * Use of H+H Celfix thin layer mortar would enable Special category of construction control to be

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Designing with Aircrete Structural Design continued Restraint and Connections Walls should be adequately restrained at the level of intermediate floors and at the roof. Detailed guidance is contained in Building Regulations Approval Document A, Small Buildings Structural Guidance Document for the Building (Scotland) Regulations, BS8103-1, Eurocode 6 and PD6697:2010. For designs to EC6, the UK National Annex offers similar, though less pronounced, benefits. Values for γM for the ultimate limit state are given in Table NA.1 of the National Annex (see Table 6). In addition, it offers advantages to...

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Where joists run parallel to the wall, the three joists nearest the wall should be connected to it by suitable metal restraint straps and located at maximum 2m centres, in line with the documents on oposite page. These straps should have an anchorage turn-down at the wall face of at least 100mm and there should be diagonal strutting between the three joists. In order that the restraining straps are able to act in compression as well as in tension, there should also be adequate packing fixed between the wall and the first joist (drawing 2). Joist Hangers Where joist hangers are used, they should...

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Designing with Aircrete Foundation Blocks Cavity Foundation Walls (drawings 4 and 5) H+H aircrete can be used for both the internal and external leaves of cavity foundations. Solid Foundation Walls (drawings 6 and 7) Foundation Blocks of 215mm thickness and upwards can be used for solid foundation walls. The foundation blocks used should be at least the thickness of the wall it supports. Omission of Mortar from the Vertical Cross-Joints (perpends) in Solid Foundations A wall below ground level which is backfilled both sides is not subject to any of the lateral loads, which could apply above ground...

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