Technical Specifications

Abbey Artstone Limited
Wetcast Technical Specification

  

Composition
Wet Cast components are manufactured in accordance with BS1217:2008 and BS 8110 in a homogenous wet cast mix. Using natural occurring aggregates, sand, Portland cement and pigments are added were necessary.

Portland cement to       BS EN 197-1:2011

Aggregates to               BS EN 12620:2002+A1:2008

Sands to                        BS 1199 and 1200:1976

Pigments to                   BS EN 12878:1999


Structural Use
Heads
are suitable for structural use up 1500mm (with minimum 150mm bearings), or greater.  But this must be confirmed by your Structural Engineers prior to installation.

Quoins, Plinths and String Courses can be used in load bearing situations when used in compression. All units are reinforced as follows: except where stated otherwise.

All reinforcement used is mild steel, galvanized or stainless steel available subject to additional costs.  

Compressive Strength
When tested in accordance with BS1881: Part 116: 1983 and BS1217:2008 and the United Kingdom cast Stone Association, the cast stone was tested over three 150mm cubes giving an average crushing strength well in excess of 35KN/mm2.

Density
The typical mean density of Wet Cast architectural masonry is 2400kg/m3 

Initial Surface Absorption
When tested in accordance with BS1217:2008 using methods in BS1881-208 values were found to be less than 0.25ml/(m2.s) as required.

Manufacturing Tolerances
All Abbey Art Stone architectural masonry complies with following tolerances unless otherwise agreed in writing by us.

The actual dimensions of individual regular units should conform to the stated dimensions subject to the  

Length

 

Tolerance in MM                  Length   Width Thickness                  

 

Up to 600mm                        +/-2     +/-2      +/-2

Over 600mm to 1000mm       +/-3     +/-3      +/-3

Over 1000mm to 2500mm     +/-4     +/-4      +/-4

Over 2500mm to 4000mm     +/-5     +/-5      +/-5

Over 4000mm                       +/-6    +/-6      +/-6

 

Fire Resistance
Units manufactured in accordance with the standard are non-flammable, non-combustible and do not give off toxic gases and can provide a barrier to the spread of smoke and flames.            

Weathering
Many factors influence the way cast stone weathers, such as design, exposure, climate and surrounding.  All pigments used are colorfast and durable and confirm to BS1014. Wet Cast architectural dressings will weather in a similar manner to natural stone, when exposed to similar conditions.

Cementitious Efflorescence
As with all reconstructed stone and cement based products there is the possibility that the temporary phenomenon known as efflorescence will occur causing lightening of colour.  This will reduce over a period  

Resistance to Rain Penetration
As with all facing masonry, (reconstructed stone walling bricks, natural stone etc) external skins of cavity walls are not totally impervious to heavy driving rain as there is the possibility that water penetration will take place through the mortar joints.  To avoid this, normal good building practice should be observed.

Cutting
Cast Stone should be designed in such a way as to avoid any site cutting.  If cutting is required please consult our technical department. 

C.O.S.H.H.Controls of substances hazardous to Health see COSHH Data Sheet 

Health, Safety and welfare
The contractor shall ensure that safety; Health and Welfare measures required or by virtue of the provision of any enactment or regulation or the working rules of the industry are complied with. 

Surface Finish
The colour and texture of the exposed face of the cast stone should be agreed between the client/architect and ourselves. As with differences in the way units are manufactured this lends itself to subtle variation in the colour. Cement and aggregates used are carefully chosen for their quality and consistency, are all obtained from natural sources and are therefore subject to variations beyond our control. We do and always make every effort to ensure consistency in colour and texture of units manufactured but no guarantees can be given. 

Cleaning of Cast Stone
Due to the fine textures and pale colors of cast stone the removal of staining of mortar and other forms of staining can be difficult.  It is for this reason that every effort must be made to avoid contamination at early stages.