Estudio experimental de la influencia de la oxidación en la capacidad de adherencia de las varillas corrugadas utilizadas como acero de refuerzo en el hormigón, mediante el ensayo Pull Out

Abstract

The objective is to determine the influence of oxidation on the adhesion between reinforcing steel and concrete, because one of the main hypotheses of the design is that the materials work together, which have an ideal adherence to transmit stress and present a correct structural performance against vertical and lateral loads (earthquakes). The manufactured specimens have a cubic shape, whose edge is 200 [mm], which is embedded with a rod of 60 [cm] of total length, and an adherent length of five diameters of the bar, without exceeding the parameters established by the standard. RILEM / CEB / FIP. The accelerated oxidation surface states chosen are 0, 50, 100, 200 and 300 hours. The Pull Out test in the test pieces to determine the load and the sliding of the embedded rods, to later calculate the tension of adhesion in five established landslides 0.01; 0.1; 0.4; 0.7; 1.0 mm. When performing an analysis of the results, which show that there are two behaviors within the phenomenon of adhesion: first, when the rods are slightly oxidized and the adhesion tension increases; second, when the bars are moderately and severely oxidized, the adhesion tension decreases.