BS EN 15498-2008 pdf download.Precast concrete products Wood-chip concrete shuttering blocks Product properties and performance.
If required, the moisture movement (shrinkage, expansion) of shuttenng blocks to be used in exposed
conditions shall be declared.
The moisture movement shall be determined according to 5.2.3.
4.2.4 Reaction to fire
Shuttering blocks shall meet the requirements of class B according to EN 13501-1.
Reaction to fire shall be determined according to 5.2.4.
4.2.5 Water vapour permeability
For shuttering blocks intended to be used in external walls water vapour permeability shall be given as design values for the wood-chip concrete and for any supplementary thermal insulation in the shuttering blocks.
Water vapour permeability shall be determined according to 5.2.5,
4.2.6 Mechanical strength
4.2.6.1 General
The mechanical strength of shuttering blocks shall be sufficient to allow handling and withstand a maximum
filling pressure of Pmax according to Annex A.
4.2.6.2 Tensile strength of web
The mean tensile strength of the web with the smallest cross-sectional area Jim shall not be less than the minimum tensile strength of web f,min according to Annex A and Annex B.
4.2.7.1 General
When relevant to the intended uses, the manufacturer shall provide information on the acoustic properties of the shuttering blocks.
NOTE Acoustic properties are mainly dependent on the density, surface characteristics, geometry and structure of the shuttering blocks and/or the mass of the wall when the blocks are filled with concrete. Other factors (e.g. air-tightness of the wall and the shape of the block-construction) also have an influence.
4.2.7.2 Airborne sound Insulation
Airborne sound insulation is a property of finished walls.
Airborne sound insulation shall be determined according to 5.2.7.1.
4.2.7.3 Sound absorption
The sound absorption coefficient shall be given as a design value when shuttering blocks are used without an applied finish.
Sound absorption shall be determined according to 5.2.7.2.
4.2.8 Thermal properties
4.2.8.1 General
When relevant to the intended uses, the manufacturer shall provide information on the thermal properties of the shuttering blocks.
NOTE Thermal properties are mainly dependent on the thermal conductivity of wood-chip concrete, additional thermal insulation, concrete in-fill and the geometry of the shuttenng blocks.
4.2.8.2 Thermal conductivity
Thermal conductivity 2 shall be given as design values for the wood-chip concrete and for any additional insulating material in the shuttering blocks.
Thermal conductivity 2 for the wood-chip concrete shall be determined according to 5.2.8.1.
4.2.8.3 SpecIfic heat capacity
When required, specific heat capacity c for the wood-chip concrete shall be determined according to 5.2.8.2.
Specific heat capacity c shall be given as design values for any supplementary thermal insulation in the
shuttering blocks according to EN 12524.
4.2.8.4 Thermal resistance of the finished wall
The thermal resistance is a property of finished walls.
The thermal resistance shall be calculated or measured according to 5,2.8.3.
4.2.9 Durability
4.2.9.1 General
When relevant to the intended uses, the manufacturer shall declare the frost-resistance with or without direct
contact with de-icing salt.
4.2.9,2 Frost resistance
For shuttenng blocks to be used in exposed conditions, frost resistance shall be given on the basis of long- term-experience or testing according to 5.2.9.1.
When tested, loss of mass shall be no more than 10 %.
4.2.9.3 Frost resistance in direct contact with de-Icing-salt
For shuttering blocks to be used in direct contact with de-icing-salt, frost resistance may be given on the basis of long-term-experience or testing according to 5.2.9.2.
When tested, loss of mass shall be no more than 10 %.
5 Test methods
5.1 Principle
Tests shall be conducted on six specimens, unless specified otherwise Shuttenng blocks shall be sampled in
accordance with E.2.
5.2 Procedure
5.2.1 Geometric characteristics
5.2.1.1 General
Geometric characteristics shall be measured on whole shuttering blocks.
The results shall be evaluated in accordance with Annex F.
5.2.1.2 Dimensions
Length, width and height shall be measured at the one third and two third positions of each pair of relevant faces. The mean value for length, width and height shall be calculated from the four measurements taken, rounded to the nearest mm (see Figure 4).BS EN 15498-2008 pdf download.