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The Concrete Times March 2015

The CONCRETE Times • MAR 2015 THE UK CONCRETE SHOW 2015 - SHOW REVIEW 26 The next product competing for the attention of industrial floor slab designers is from Peikko, who also used the show to launch their latest new product, the Optima Joint. 15 years ago, Pat Eve designed the first “leave in place” free movement joint that rapidly became the best-selling joint in the world and even today, remains the industry standard. “It incorporated heavy steel top rails of 10mm x 50mm section, with welded on shear studs for anchors,” say Pat, now Design and Development Manager at Finnish fixing and fastening manufacturers, Peikko. “With the Optima Joint”, he continues, “we have the next generation joint. It is more efficient in its use of steel, demonstrably stronger in all aspects, more user friendly, and manufactured by different methods, with the result that it has a greatly reduced carbon footprint.” Another new market entrant is the The Cosinus Slide® joint from Belgian manufacturers, Hengelhoef Concrete Joints, represented in the UK by Derbyshire based, Propex Concrete Systems. The showpiece of their product range, the Cosinus Slide® is a result, the company claims, of their search to develop the perfect joint, which they believe is the best ever load transfer system. It combines the Sinus Slide® solution with an unique technology of load bearing capacity of the floor without any dowel system and is characterised by a stable double 2x5 mm Sinus steel plate on top opposed by a double Sinus steel plate on bottom. Instead of traditional anchor studs, the joint is fixed in the concrete by a special wreathed continuous rebar system over the total length of the joint and with connections top and bottom. A small steel plate in the middle prevents concrete overflowing. The Peikko Optima Joint Thanks to the Sinus-Cosinus geometrical shaped form of the joint and the concrete, load transfer is not realized by the joint (with dowels) but by the floor itself. Hengelhoef Concrete say that the joint is the floor, the floor is the joint. Each sinus corrugation on top is opposed by a cosinus corrugation underneath. These crossed sinus corrugated steel plates shape small vertical steel concrete columns over each other. The load bearing of these columns defines the load bearing capacity of the complete floor. The loads are transferred simultaneously and proportionally throughout and over the floor by those vertical Concrete Columns shaped and supported by the Sinus-Cosinus geometry. This unique load bearing capacity of the floor slab is calculated and proved for all kind of forklift traffic say the company. The fourth new entrant into what now appears to be a suddenly crowded market sector, is the ARMOURJOINT from UK based, industrial concrete floor product specialist, Isedio. ARMOURJOINT is a leave-in-place formwork and load transfer system providing heavy duty protection to slab arrises. The armouring to slab panel edges is by way of solid, high specification, cold drawn steel strips 40mm deep x 10mm thick. The steel strip armouring is anchored to the concrete with shear studs. Each and every shear stud is factory The Peikko Optima Joint


The Concrete Times March 2015
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