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Durability Problems of Reinforced Concrete Structures on the Lagos Lagoon in Nigeria

2024; Springer Nature (Netherlands); Linguagem: Inglês

10.1007/978-3-031-53389-1_57

2211-0852

Joseph A. Akinyele, Uvieoghene T. Igba, J.O. Labiran,

BIM and Construction Integration

The ingress of sulphate and chloride salts into reinforced concrete structures has led to the continuous deterioration of the bridge structures and some of the jetties on the Lagos lagoon. This research investigated the current durability problems associated with these structures using indirect methods. Modelled samples of grades 30 and 40 cubes and reinforced concrete beams were submerged in the lagoon water that contains high salt contents while control samples were submerged in freshwater for a one-year test. Compressive, flexural and pull-out tests were carried out on the concrete at 28, 90, 220 and 365 days. ANSYS software was used to simulate the reactions of the beam elements to loading on the 28th and 365th days. There was a general reduction in strength for concrete samples cured in lagoon water, while the freshwater-cured concrete increased in strength. A mathematical model was used to determine the deterioration rate of concrete elements, this mathematical model was compared with an existing model to determine it reliability. The current deterioration rate of the concrete elements was used to predict the future strength of all the concrete samples over a period 10 years.