土木外文翻譯--通過(guò)再堿化技術(shù)增加鋼筋混凝土的使用-其他專(zhuān)業(yè)-全文預(yù)覽
【正文】 ） INCREASE REINFORCED CONCRETE STRUCTURES USEFUL, BY REALKALIZATION. Abstract. Reinforced concrete is an economical material that appropriately prepared has much stability against, external or internal deterioration. Concrete protects steel bars, which are susceptible to corrosion due to their high energy. Concrete protection is effective when a protective oxide film is formed in proper working conditions. This film adheres to the steel surface creating a stable passive layer and restricting the metal solution. The passive film on the reinforcing steel can be partially or totally destroyed due to its exposition high concentrations of chloride, a concrete carbonate, high porosity of concrete, etc., originating as consequence a corrosion process. The Cuyo area, mainly San Juan and Mendoza provinces of Argentina, has many cave in areas and/or abundant saltpeter outcrop powder, that characterizes high salinity environment, modifying the structures durability built. Deterioration begins with micro fissures and cracks that expose steel to environment aggressiveness causing a quick corrosion, and generating expenses which were not included in the construction project. This work researches realkalization and the study technique is applied to a school building located in an agricultural area. Such building structures are seriously affected by corrosion problems. The electrochemical technique allows a pH increase of concrete pores, due to the incorporation of a surface alkaline electrolyte. This process reprotects reinforced concrete avoiding corrosion continue on and increasing the useful life of the structure. The technique under study can be applied to reinforced concrete structures with carbonation problems. Keywords: Reinforced Concrete – Corrosion – Realkalization 1. Introduction. The integrity of a reinforced concrete structure depends on the quality of its ponents and of its dosage, as well. In this way it acquires the best properties in order to guarantee a service life extension. Concrete protects steel in two ways: a) it cons titutes a physical barrier separating steel from the surroundings and b) as it has a high pH value, it forms chemical pounds during cement hydrate reactions creating a passive film on steel, which produces a chemical protection against corrosion. Factors such as, an appropriate concrete against environment, low concrete porosity, adequate steelconcrete adherence, minimum cracking and spalling and, the possibility of reforming a stable passive film oxides on steel contribute to increase the durability of reinforced concrete structures. However, there are several causes that can produce the destruction of such passive film. In practice, some factors may cause reinforced concrete electrochemical corrosion within the carbonated area. Besides, the presence of chlorides or of all of the other already mentioned together with cracking and high concrete porosity,and the probable saturation of concrete pores, which allow the O2, CO2 and Cl migration. All of them need humidity and the en
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