Despite this fact, roll mats are seldom utilised and then only in some countries. Whereas, for example, roll mats are employed frequently and very effectively in Scandinavian countries, they are found only just occasionally in Germany.
Roll mats are installed by simply being rolled out like a carpet. A free choice of rebar lengths, diameters and spacing generates substantial savings on steel.
Roll mats can be produced by varying manufacturing methods. Concrete reinforcing bars are welded together with flat steel strips and then coiled up or the rebars are joined together with tying wire and then rolled up. Pedax offers this latter procedure using an auto- mated machine called "Spinmaster".
The wire tying technique offers some advantages:
- Non-welded roll mats can be employed without any problems for areas with alternating loadings, as, for example, would be necessary with bridges or reinforcement for multi-storey car parks.
- The material jointing in the reinforced concrete remains unchanged.
- The machine operator has no need of welding permits and consequently no employees with special qualifications.
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