JORDAHL has developed and produced high-quality and innovative products in Germany in the fastening, reinforcing, connecting and assembly technologies sectors as well as façade connection systems.
On the 25th and 26th of March J&P Building Systems will be showcasing both the Cast-in-channels and Punching Shear Reinforcement JDA from the JORDAHL® product range at the UK Concrete Show within the NEC, Birmingham.
The JORDAHL® Punching Shear Reinforcement JDA are used for the transmission of high shear forces in flat floor applications with reduced requirements for formwork and reinforcement and for optimum use of space. They can also be used for foundations and consist of double-headed anchors connected by a strip.
We will also be exhibiting a range of cast-in channels for drill, noise, and vibration-free fixings to concrete. JORDAHL® anchor channels form a versatile and proven fastening system. They absorb static tensile and shear loads perpendicular to the channel axis. Continue reading
Cast-in channels are frequently supplied as a galvanized items, since this is considerably cheaper than stainless steel (by a factor of 3 or 4).
The life of the galvanizing protection depends on the thickness of zinc and the environmental conditions. The thickness supplied by the major European suppliers of channels is a minimum of 50 ?m (microns), and may be thicker for larger profiles. However, by considering only this minimum value, it is a simple matter to arrive at the minimum life expectancy for various environments.
Figures for the rate of corrosion of galvanizing in UK are published by The Galvanizers Association in two formats.
The first of these is the Zinc Millennium Map. This is a map of the UK divided into 10 km squares and for each square; the anticipated rate of corrosion is given in ?m / year. The map may be accessed via www.hdg.org.uk. The figures from the map are only a guide and refer to exterior/exposed conditions.
As an alternative, the Galvanizers Association also publish corrosion rates for different environments, including interior conditions. These are based on BS EN ISO 14713 and are as below.