Product Details This European Standard specifies the characteristics and performance requirements of aggregate concrete masonry units made from dense and lightweight aggregates or a combination of both for which the main intended uses are common, facing or exposed masonry in load bearing or non-load bearing building and civil engineering applications. The units are suitable for all forms of walling, including single leaf, external leaf to chimneys, cavity wall, partitions, retaining, and basement. They can provide fire protection, thermal insulation, sound insulation and sound absorption. This European Standard includes aggregate concrete masonry units of an overall non-rectangular parallelepiped shape,! It defines the performance related to e. The marking requirement for products covered by this European Standard is included.
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It will replace BS in April after a month period of co-existence. There is no doubt that over a period of 24 years BS has served our industry well in developing concise and unambiguous specifications for aggregate concrete bricks and blocks used in far ranging applications.
Like most British Standards it has been necessary to adapt BS to suit an enlarged market as well as to reflect up to date materials testing and regulatory requirements. This Guide to BS EN has been prepared to assist anyone involved in the design, specification and ordering of aggregate concrete blocks to understand the changes and thereby continue to make the specification and procurement of aggregate concrete blocks as straightforward as possible.
Background BS EN Aggregate concrete masonry units is written as a performance standard which means that all requirements are based on the finished product, rather than prescriptive standards which limit the materials that can be used in manufacture. Unlike BS , BS EN requires a manufacturer to conduct limited type testing and have a documented factory production control system.
A third party to monitor the factory production control system is not essential. The test methods for the required properties are listed in BS EN Some of these test methods are familiar but others are new. Categories of units are introduced. It contains a national foreword and a national annex, which between them explain the essential differences between BS and BS EN This is an important distinction between the previous custom of specifying and ordering blocks based on dimensions in the order of length x height x width thickness.
Tolerance D4 is intended solely for blocks to be laid with thin joint mortar, a technique rarely used in the UK. Closer tolerances on any dimension may also be declared by the manufacturer for any tolerance category. The test method for dimensions is BS EN BS EN puts lower limits on: Shell thickness but these limits are generally much lower than used in current UK designs and are normally easily complied with using current aggregate block products. Blocks currently described as solid will become Group 1 units.
Cellular and hollow blocks will, depending on void content, will be described as Group 1 or 2 units. Group 3 and 4 units are not commonly manufactured for use in the UK. Configuration also covers flatness requirements for the faces of facing quality units only, and flatness requirements for the bed surfaces of units to be used with thin layer mortar in D4 tolerance category. There is also a requirement for the parallelism of bed faces of units to be used with thin layer mortar in conjunction with the D4 tolerance category.
For facing units there is an optional but strongly recommended procedure for the site approval of the appearance of unit prior to their use. Density The gross dry density of the blocks has to be declared by the manufacturer.
The standard also requires net dry density to be given when it is relevant to the application. The net dry density is rarely likely to be a necessity in practice. The appropriate test method is BS EN The compressive strength will need to be declared air dry. The conditioning and surface preparation used need to be declared by the manufacturer. These are slightly higher than strengths determined to BS The manufacturer will declare whether a unit is category I or category II.
A category I unit would be approximately equivalent to special category as defined in BS and would require third party certification and monitoring of the production control system. Thermal properties In the UK, configuration and density is used primarily as the basis for the declaration of thermal properties.
Water absorption by capillarity Water absorption is only applicable to facing units with no applied finish.
The appropriate test method is BS EN , Clay and aircrete units use the same test method but using different procedures within the method and these will lead to test results for the products, which cannot be directly compared. This will now be declared to a new test method, which is a combination of drying shrinkage and wetting expansion. Non- combustibility test. And the results need to be classified according to BS EN Shear bond strength A value of shear bond strength needs to be given and it is recommended that the tabulated value of 0.
The tabulated value or a measured value is of no practical use as bond strength in practice will be dependent on a number of factors outside the control of the producer and a value could not be guaranteed as being universally applicable, but only for a set of specific conditions, which would be difficult to replicate on site.
There are no classification systems for masonry units in the UK but there are in some EU countries. Marking It is anticipated that product identification details and means of identification of the date of manufacture will be given on delivery documentation and on the product where appropriate.
BS EN 771-3:2011+A1:2015
Newer versions Abstract Determines the characteristics and performance requirements of aggregate concrete masonry units made from dense and lightweight aggregates or a combination of both for which the main intended uses are common, facing or exposed masonry in load bearing or non load bearing building and civil engineering applications. The units are suitable for all forms of walling, including single leaf, external leaf to chimneys, cavity wall, partitions, retaining, and basement. They can provide fire protection, thermal insulation, sound insulation and sound absorption. This European Standard includes concrete masonry units of an overall non rectangular parallelepiped shape, especially shaped and accessory units. It defines the performance related to e.
BS EN 771-3
BS EN 771-3:2003
Understanding BS EN 771-3 Aggregate concrete masonry units.pdf
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