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-其他專業(yè)-在線瀏覽
2025-03-24 08:29本頁(yè)面
【正文】 rrosion 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 environmental aggressors, as well, to plete the corrosion process. Once the corrosion occurs damages can be observed in three different slopes, Cyted (1997): a) on steel, which diminishes its original diameter and its mechanical capacity。 since if spalling and cracking occur,buildings should be repaired and, it implies great demands of money. In order to extend the structure service life, it is necessary to use reinforced concrete applying diverse techniques such as cathodic protection, epoxy cover, among others. This research paper deals with a nonconventional realkalization technique, which offers an indirect protection through concrete. It would allow increasing the pH concrete aqueous porous solution, incorporating an alkaline electrolyte from concrete surface. It has the advantage of stopping or lessening the concrete reinforcement corrosion. It is also a very appropriate procedure to repair structures which have been damaged by carbonation. This process was tested, not only at laboratory level, but it will be also practically applied to a school building. Thanks to a previous research work data base (Solorza et al., 2021), it was possible to select an area as a sample of several school buildings in Albard243。 et al., 1989) were carried on different buildings. The diagnosis obtained showed the degree of damage underwent by those buildings.
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