This software is powered by an up-to-date database of the properties of our fibres. These data are the result of an extensive experimental campaign carried out in collaboration with SMART ENGINEERING and the Structural Technology Laboratory of the Universitat Politècnica de Catalunya.
An advanced specific software for calculating dosages of steel and polymer fibres in reinforced concrete floorings, covering the widest spectrum of load situations.
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In the concrete characterization experimental campaigns, for each reference different concrete of resistant class H-25 and H-45 with different fiber contents (20 kg / m3, 40 kg / m3, 60 kg / m3) are tested.
The following table shows the test plan detailing the properties of the concrete analyzed, the regulations used, as well as the age of the concrete at the time of the tests, the type and number of specimens (for each dosage).
The most extensive test for characterization of the post-cracking behavior of the HRF is that of three-point bending in a 150x150x600 mm prismatic specimen, with a notch in the center light section. Said notch is made by means of a diamond disc cutter once the concrete has hardened. The INSTROM 8505 test machine, equipped with a 100 kN load cell, is used to determine the flexural tensile strength (fLOP) and residual resistance of the HRF (fR, i).
The F – CMOD curve recorded during the test is used to deduce residual flexural strengths (fRi) associated with certain values of the crack opening. These values are subsequently used to deduce the constitutive equation σ-ε of the tensile material, which allows the simulation of the resistant behavior through numerical models
Another control method to determine residual resistance and toughness, developed by UPC researchers and used for quality control of HRF in works with large volumes of HRF involved, is the Barcelona Test. In said test, the specimen is subjected to a tension state of indirect traction by means of the application of a vertical point load transmitted by two punches placed on two opposite faces, the piston descent being recorded as a function of the applied load.
One of the advantages of this test is its lower dispersion when compared to a beam test; The latter can lead to dispersions of up to 30-35%. Thus, the Barcelona Essay mobilizes a greater area of breakage during it and, therefore, fewer dispersions.
One method to obtain the content and orientation of fibers in concrete is the inductive test. The steel fibers present in a concrete specimen proportionally alter the magnetic field around the specimen. This variation of the magnetic field is manifested from an increase in inductance (ΔL).
The inductance measuring equipment uses a discontinuous coil, which generates a uniform magnetic field inside the measuring cell.