The effect of industrial coating type acrylic and epoxy resins on the durability of concrete subjected to accelerated carbonation

摘要

The effect of industrial coating type acrylic and epoxy resin on the durability of concrete subjected to accelerated carbonation. Concrete carbonation is an important factor that affects reinforced concrete durability. One of the major consequences of this phenomenon is the initiation of reinforcement corrosion; reinforcement loses their protections initially protected by the basic environment nature of concrete. The migration of CO2 takes place in the concrete through the gas phase when the concrete is not completely saturated and through the liquid phase in the form of carbonate ions. The main objective of this work is to minimize the carbonation depth in concrete elements in order to increase the service life of reinforced concrete structures by applying two types of coatings on the concrete surface: acrylic coating in aqueous phase and a epoxy resin coating produced by the Algerian industry. For this reason, we are interested in formulating binary and ternary concrete compositions to prepare prismatic test specimens of 7cmx7cmx28cm. For each composition, two types of coatings, acrylic and epoxy resin were applied; other test specimens have been made to follow the evolution of the mass during the test using enclosure accelerated carbonation. The results show clearly the beneficial contribution of the epoxy resin coating in decreasing the carbonation depth compared with the acrylic coating. In addition, the binary composition of the concrete presented a good advantage on carbonation durability.