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METHOD FOR BUILDING PRESTRESSED CONCRETE STRUCTURES BY MEANS OF PROFILES CONSISTING OF A SHAPE-MEMORY ALLOY, AND STRUCTURE PRODUCED USING SAID METHOD

  • US 20160053492A1
  • Filed: 03/17/2014
  • Published: 02/25/2016
  • Est. Priority Date: 04/08/2013
  • Status: Active Grant
First Claim
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1. A method to create prestressed concrete structures by means of profiles made from a shape-memory alloy, be it of new structures and structural elements or cement-bound mortar mixes for the reinforcement of existing concrete structures, characterised by the fact thata. the outside of the existing structure to be reinforced or recess (FIG. 9) is roughened therein,b. that profiles (2) made from a steel-based shape-memory alloy of polymorphic and polycrystalline structure with ribbed surface or with a thread-shaped surface, which can be taken from its condition as martensite to its permanent condition as austenite by increasing its temperature, are attached to the roughened outside (9) of a structure (6,12),c. capillary saturation of the outside of the structure (6,12) with water is generated and then a cementitious matrix is applied to this outside as mortar mix to cover the profiles (2) made from a shape-memory alloy,d. following the hardening of the cementitious matrix, the profiles (2) made from a shape-memory alloy are made to generate contraction force and thus tension through the input of heat, as a result of which the created mortar mix causes prestressing of the same as reinforcement layer (16,19) through the indentation of the roughened outside (9) of the structure (6,12) whereby force is transmitted to the concrete or mortar mix (1) through the surface structure of the profile (2).

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