Road structure – process – or apparatus – Pavement – Reinforced structure
Patent
1990-11-06
1992-10-13
Britts, Ramon S.
Road structure, process, or apparatus
Pavement
Reinforced structure
E01C 1116
Patent
active
051545349
DESCRIPTION:
BRIEF SUMMARY
The subject of the present invention is a process for manufacturing a reinforcement for reinforcing concrete structures and, in particular, a concrete slab or web.
A further subject of the present invention is a reinforcement obtained according to this process.
FR A-2,579,651 discloses a reinforcing element which can be used for any continuous work of great length and, in particular, for concrete roads or roadways, which, while allowing continuous rapid and easy laying, also ensures increased resistance to transverse cracking for a reduced amount of metal reinforcement.
This reinforcing element takes the form of a relatively narrow and thin strip whose main faces are corrugated or notched.
The corrugating takes the form of an alternately projecting, delimiting protuberances and, hollow, delimiting depressions, relief. These protuberances and depressions can have the form of optionally truncated cones or pyramids or any other suitable form, such as a cylindrical or parallelepipedal form. The height of the protuberances or depressions relative to the adjacent surface is preferably approximately 5 to 80% of the thickness of the metallic ribbon.
The metallic ribbon is made from steel with a high elastic limit, for example, having a tensile strength greater than 800 MPa, and, preferably, has a thickness of 0.8 to 2.5 mm and a width of 10 to 60 mm.
Moreover, the corrugating can be obtained by stamping or notching, if appropriate in the hot state.
FR-A-2,579,651 also describes a process for manufacturing a corrugated or notched metallic ribbon such as defined above, which process consists in passing a metallic ribbon, in the form of a flat band between at least one pair of rolls whose working faces comprise, respectively, hollow and projecting imprints corresponding to those which it is desired to impart onto the metallic ribbon.
In order to give the said metallic ribbon the desired mechanical properties, before corrugating or notching, it is subjected to a patenting treatment and, after corrugating or notching, to a treatment which increases resistance to corrosion, such as pickling followed by a phosphate treatment.
Such a reinforcing element and the process for producing it possess various drawbacks.
In fact, the metallic ribbon is made from steel with a high elastic limit and, consequently, it cannot be galvanized, which means that it has to be subjected to a phosphate treatment in order to protect it against corrosion.
Moreover, this steel cannot be welded and thus does not permit, for example, the manufacture of trellises.
The invention aims to remedy these drawbacks while retaining the advantages of a flat element for reinforcing a concrete structure.
The subject of the invention is a process for manufacturing a reinforcement for reinforcing concrete structures and, in particular, a concrete slab or concrete web, characterized in that the base material used in a hot-rolled sheet with a thickness of between 2.5 and 6 mm, made from steel having a carbon content lower than 0.9% and an elastic limit of approximately 500 MPa, which is subjected to cold rolling at a cold-working rate greater than 40% in order to obtain a sheet having, on the one hand, a thickness of between 0.8 and 2.5 mm, and, on the other hand, an elastic limit greater than 700 MPa, the sheet being cut in order to obtain a metallic ribbon which is then corrugated or notched continuously.
A steel with a low carbon content which is below 0.9% and has an elastic limit within the range 250-500 MPa cannot be used in reinforcing a concrete except by excessively increasing the density of the metal reinforcement. For this reason, according to the invention, steel with a low carbon content and an elastic limit of the order of 500 MPa is subjected to cold rolling at a cold-working rate greater than 40% in order to obtain the mechanical characteristics necessary for the use thereof, in an acceptable density, in reinforcing concrete structures.
According to the invention, the use of a steel with a low carbon content makes it possible to obtain a reinforce
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The Making, Shaping and Treating of Steel-p. 706, Seventh Edition, Second Impression .COPYRGT.1957, United States Steel.
Guerin Georges J. M.
Temenides Michel
Britts Ramon S.
Schoeppel Roger J.
Sollac
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