EFECTO DE LA RELACIÓN AGUA-CEMENTO EN LA DIFUSIÓN DE CLORUROS EN HORMIGÓN ESTRUCTURAL.

Abstract

Given the risk of corrosion of structures in reinforced concrete in a marine environment, the problem of loss of mechanical resistance of the concrete arises. This loss is due to the transport of chloride that occurs through the interconnected pores who are the vehicle for ionic diffusion, permeability, absorption or migration. As part of this titration work, laboratory studies were carried out to evaluate the incidence of a chloride-containing medium on the permeability, diffusivity and compressive strength of structural concrete mixtures. In the study, the cement water ratio was considered as variable, for a type of cement and reinforcement material (Holcim Premium HE and Limestone No. 67, Unified Sand and Shaken Sand). The laboratory work is carried out in the facilities of Holcim Ecuador, following current protocols and regulations. The main contributions that result from this work are focused on quantifying the permeability, diffusivity and resistance in compression, for the type of concrete mix prepared with three water-cement relations and from these results establish how these variables are related. The analysis of permeability and penetration of chlorides allows us to intuit that in order to reduce the penetration of large quantities of chloride, it is necessary to use concrete with a good quality (low A / C), this makes it possible to achieve a greater useful life of the material. The ASTM 1202 method is used for laboratory work, so it may be convenient to comparatively analyze other ion migration methods for the same mixtures.