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Lições de manutenção corretiva ineficaz e proposta de intervenção nas estruturas de betão armado das pontes Juscelino Kubitschek e Paulo Barreto Menezes
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| 2.94 MB | Adobe PDF |
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Abstract(s)
A durabilidade de estruturas especiais em betão armado em ambiente marítimo é desafiada permanentemente por um ambiente muito agressivo. Para além disso, a durabilidade pode ser, consideravelmente, reduzida em situações cuja construção nova ou a reabilitação de obras não são executadas de forma apropriada.
Esta dissertação trata de dois casos de estudo referentes a duas pontes em Aracaju (Juscelino Kubitschek e Paulo Barreto) em que foram detectadas, depois da realização de uma inspeção visual, manifestações patológicas precoces pouco tempo após manutenção corretiva. Os serviços de manutenção corretiva em obras de arte especiais mostram-se muitas vezes inadequados pela falta de cultura de manutenção e prevenção, afetando a durabilidade do betão armado. As manifestações patológicas geralmente apresentadas são provocadas pelo ambiente marítimo agressivo, pelos materiais inadequados e pela ineficiência das soluções técnicas, gerando perda no seu desempenho estrutural.
Assim, o objetivo deste trabalho consiste na análise e na proposta de soluções de intervenção de manutenção nos dois casos de estudo, a partir do diagnóstico de manifestações patológicas precoces observadas após reparação, para apoiar uma nova manutenção corretiva e garantir durabilidade estrutural efetiva das duas pontes.
Este trabalho pretende contribuir com lições para os projetistas e as autoridades públicas, responsáveis pela manutenção das infraestruturas do estado de Sergipe, de forma melhorarem os procedimentos de manutenção corretiva, salvaguardado assim a integridade estrutural das pontes.
The durability of special structures in marine environments is permanently challenged in a very aggressive environment. In particular, durability can be considerably reduced in situations where construction or rehabilitation works are not carried out properly. This dissertation deals with a case study of two special works of art in which, after performing a visual inspection, pathological manifestations were detected in a short period of time, after their corrective maintenance. Corrective maintenance services in special works of art are more aggravating due to the lack of maintenance and prevention culture, affecting the durability of reinforced concrete. The most worrying damages identified were reinforcement corrosion, leaching, efflorescence, infiltration spots, cracks and erosion in the crowning block. However, the pathological manifestations presented are caused by the aggressive maritime environment, inadequate materials, and their inefficient corrective maintenance, causing loss of structural performance. Thus, this article has as its main objective presenting and discussing the corrective maintenance project for the durability of structures, in aggressive maritime environments and to propose efficient measures to correct the current ones and prolong them, avoiding the appearance of new pathological manifestations in a shorter period than required. Finally, it is expected that the article will contribute with the designers and public agencies that are responsible for the maintenance of the state, with the purpose of assisting in the procedures, maintaining their structural integrity.
The durability of special structures in marine environments is permanently challenged in a very aggressive environment. In particular, durability can be considerably reduced in situations where construction or rehabilitation works are not carried out properly. This dissertation deals with a case study of two special works of art in which, after performing a visual inspection, pathological manifestations were detected in a short period of time, after their corrective maintenance. Corrective maintenance services in special works of art are more aggravating due to the lack of maintenance and prevention culture, affecting the durability of reinforced concrete. The most worrying damages identified were reinforcement corrosion, leaching, efflorescence, infiltration spots, cracks and erosion in the crowning block. However, the pathological manifestations presented are caused by the aggressive maritime environment, inadequate materials, and their inefficient corrective maintenance, causing loss of structural performance. Thus, this article has as its main objective presenting and discussing the corrective maintenance project for the durability of structures, in aggressive maritime environments and to propose efficient measures to correct the current ones and prolong them, avoiding the appearance of new pathological manifestations in a shorter period than required. Finally, it is expected that the article will contribute with the designers and public agencies that are responsible for the maintenance of the state, with the purpose of assisting in the procedures, maintaining their structural integrity.
Description
Keywords
Manifestação patológica Durabilidade e deterioração nas estruturas Ambientes agressivos marítimos Manutenção corretiva em obra de arte Pathological manifestation Durability and deterioration in structures Aggressive marine environments Corrective maintenance in artwork