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In the most exposed parts of the structure, stainless steel reinforcing bars are the most efficient solution to ensure the durability of concrete. Stainless steel rebars are used for repairs and for new works, partially or completely replacing carbon steels, both in precast products and for the execution of cast-in-situ structures.
UGIGRIP® is "stainless to the core", and there are therefore no worries about durability over time and no worries concerning metal cutting locations.
The passive layer: Stainless steels produce a very thin oxide on the surface, consisting of chromium oxides and hydroxides a few Angstroms thick. This oxide, commonly called the passive layer, protects the stainless steel from external attacks and provides it with properties ensuring the corrosion resistance of these alloys. The passive layer forms an intrinsic part of the material, unlike the zinc deposited by galvanization on steels, which explains why stainless steel has essential advantages. Once formed, this layer is perfectly stable, because its thickness remains constant. The passive layer inhibits any exchange between the metal and the outside: in the event of an incident on the material (scratch, cutting, impact, drilling, deformation, etc.), it is reformed spontaneously. This self-restructuring is also called "repassivation".
Choosing the most appropriate grade: Only by choosing the appropriate grade for the operating environment can the durability of structures be increased depending on the areas of exposure. European standard EN 206-1 defines the five main exposure classes of concrete structures. Depending on the environment to which the part of the structure is exposed, Ugitech recommends using the following grades of stainless steel.
Note; Stainless steel grade recommendation is made irrespective of the quality (porosity and permeability) of the concrete used.
Geometry of indented reinforcing bars
UGIGRIP® reinforcing bars are of the bolted rebar type: Bolted rebars show at least two bolt fields with a uniform space. They can be with or without ribs; when there are ribs, their height (a') must not exceed 0.15 d (d = nominal diameter of the rebar).(See the picture part of the datasheet)
Note: The angle of inclination of the bolts on the longitudinal axis of the product must be in a range between 35° and 75°. In any diametral plane, the angle of inclination of the sides of the bolts with the generatrix of the core contained in that plane must be greater than or equal to 45°.
The height of the bolts must be in a range between 0.05 d and 0.1 d; the bolt spacing must be in a range between 0.5 d and 1.0 d (d = nominal diameter of the product).
Form factors: The standards require rebar surface shape characteristics capable of ensuring steel/concrete bonding. The requirements cover minimum values, either for bolt height or recess depth, or the "relative surface area" of the bolts (fR). The bolt form factor must comply with the requirements given in the table below, depending on the product's nominal diameter.
Minimum form factor (fR):
Mass per unit length of stainless steel rebars
Product marking: The products manufactured by Ugitech are referenced individually according to the production plant. This mark is affixed regularly on the coils and bars produced by Ugitech:
Standard products: UGIGRIP® products can be delivered in various forms:
UGIGRIP® stainless steels are weldable by all types of processes used for welding rebar steels (electrical discharge, friction, resistance, solid wire or flux-cored wire MIG, coated-electrode arc, etc.).