ESTUDIO MECÁNICO Y ELECTROQUÍMICO DEL SISTEMA CONCRETOACERO DE REFUERZO MODIFICADO CON FIBRAS NATURALES PARA PREDECIR SU TIEMPO DE VIDA ÚTIL

Abstract

Concrete-steel reinforcement systems, are considered durable and resistant structures, but in turn they are exposed to failures in time as it is corrosive. The modification of the system is carried out by the addition of pith fraction in sugar cane bagasse to leverage its hygroscopic properties through its mechanisms of absorption and capillarity, to thus undermine the conductive characteristic of concrete resistivity. Moreover, the fiber is added in quantities of 2.5%, 1% and 0.5% in volume of concrete and a particle size of 2mm, in the mixing stage; study their mechanical properties tests of resistance to compression (f´c) and by means of electrochemical techniques potential to open circuit (OCP), resistance to the polarized (Rp), and spectroscopy Tafel determines the speed of corrosion of steel reinforcement in concrete. Results show that for the characterization of the mixture for concrete hydraulic, presents a ratio of water to cement 0.45 and its mechanical strength is 30.2 MPa, implying that the concrete manufactured has suitable mechanical properties. By electrochemical techniques specimens exposed in controlled atmosphere with a relative humidity above 80% presented greater corrosion resistance compared with those exposed in sea water, this corroborates the results of resistivity, what the passage of the current would be harder through the matrix of concrete specimens exposed in atmosphere.