Compressive strength of reinforces concrete beams exposed to marine environment by using a nondestructive test (NDT) / Siti Nor Faizah Kamaruddin

Seawater attacks cause marine concrete constructions to have a substantially shorter actual life than their intended service life. Corrosion-induced deterioration is one of the main causes of the decline in the structural serviceability and dependability of reinforced concrete (RC) structures, particularly those exposed to marine environments. Quality assurance during and after new structural construction and reconstruction processes, the characterization of material qualities, damage as a function of time, and environmental effects are becoming major concerns. One of the jetties in Malaysia was founded with the deterioration of structures. The jetty has been repaired in 2020. The issue at the jetty was, the sea level rise during the concrete work, and it was discovered that the seawater had penetrated the concrete mix through the gaps in the formwork. After the striking of formwork, it was discovered that there were hairline cracks with a width is 0.2 mm on the surface of the beam, and there were also bungholes with various sizes on the surface of the beam after the concrete work was carried out. It is worried that cracks and bungholes on the surface of the reinforced concrete beam will affect the structure's integrity and accelerate the reinforcing steel's rusting process as the structure is exposed to the splash zone area. Concerning that, this study was conducted to determine and analyze the compressive strength of repaired reinforced concrete beams located in splash zone areas using the Non-Destructive Test (NDT) method, to assess the crack pattern of grade C30 concrete beams exposed to the marine environment through compression cube test and flexural loading test, and to analyze the compressive strength test of the concrete that has been mixed with the seawater.