Speciment for characterization tests under direct tension of concrete and other materials

  • From Spain
  • Responsive
  • Patents for licensing

Summary of the technology

Researchers from the University of Burgos, in collaboration with other research centers, have described a new invention that consists of the geometric definition of a specimen to carry out characterization tests of the tensile strength of concrete and other secondary binding materials, specific for the direct tensile test.

Details of the Technology Offer

New and innovative aspects

Tensile characterization tests of concrete and other secondary binder materials are mainly carried out by means of indirect tensile tests, which are simpler from the point of view of their execution, but less reliable. Direct tensile tests, being more complex, are less common. There is no standard specimen geometry for these tests, and specimens with a wide variety of geometries have been used. The geometric design of the test specimen is essential for successful direct tensile testing.

The solution proposed by the researchers makes it possible to determine geometrically a test specimen that guarantees that the break will occur, in the highest possible proportion, in the central area and that it is not affected by the local effects derived from the anchoring system. from the specimen to the load application system.

Main advantages of its use

This specimen is intended to serve as a basis for conducting, in a more reliable way, direct traction tests on concrete and other secondary binding materials, in such a way that all the specimen show a break in the central zone and, therefore, all direct traction tests can reach the "valid" condition.


The geometry of the test specimen described by the researchers by the present invention comprises a body of revolution made up of a central straight section, first and second straight end sections, and two first and second transition curved sections, which are arranged between the straight section. central and the first and second extreme straight sections respectively. This proposed specimen manages to substantially reduce the quotient between the maximum stress in the specimen and the maximum stress in its central straight section, approaching unity. To do this, the maximum principal tensile stress fields that appear in different examples of specimens have been calculated, all of them, with a geometry of revolution, subjected to a uniform tensile load, in such a way that the maximum principal stress in the area of the central straight section is the unit.


This specimen is of great interest for laboratories for the characterization of hydraulic binding materials (such as concrete, cement mortars, lime mortars or plaster mortars, among others). It is also of interest to research centers that are investigating the mechanical properties of concretes and secondary binding materials.

Intellectual property status

Protected by patent P202130588

Current development status

Developed exclusively in the laboratory and validated for industrialization

Desired business relationship

Commercial Agreement, License Agreement, Technical Cooperation: further development; Technical Cooperation: testing new applications; Technical Cooperation: adaptation to specific needs.

Intellectual property status

Attached documents

Related Keywords

  • Industrial manufacturing, Material and Transport Technologies
  • Measurements and Standards
  • Industrial Products
  • Other
  • concrete
  • specimen for direct tensile test
  • construction materials using binders


The aim of the The Technology Transfer Office (TTO) of the Univesidad de Burgos is to promote Innovation technology through the reseach results transfer and the conexions between the University and the new needs and requirements of the society - we are the link between the University and the Industry. Contact person: José Manuel López (jmllopez@ubu.es)


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