Abstract
This study deals with experimental investigations of beam performances in a marine environment. Two kinds of concrete beams, unreinforced and reinforced with carbon plates and carbon rods, are being tested. The first one is stored in a laboratory, the other is exposed to a marine environment located in the north of France. After 12 months, all beams are tested via a four-point bending test in a laboratory. Results obtained have shown that beams stored in marine environment have a better behaviour than those stored in laboratory. It should be noted that no damage has occurred on these beams. However, we observe a significant increase of load of about 32% to 48% causing the first crack observed on the beams stored in marine environment compared to those stored in the laboratory. This means that beams in situ offer increased stiffness and a slight gain of failure loads. This may be due to the development of living organisms (in a marine environment) which acted as additional adhesive and sealing, providing a protection of concrete structures against damage.
Highlights
Port and river infrastructures are an important heritage in France, 60% of these infrastructures are over 50 yr old
When the outdoor temperature drops below À3 °C, moisture contained in the concrete’s pores freezes starting from the cladding’s largest pores
Fazli et al [18] studied the effects of marine environmental conditions on the bonded and bare surfaces of concrete slabs by means of the pull-off test
Summary
Port and river infrastructures are an important heritage in France, 60% of these infrastructures are over 50 yr old. Structures in a drawdown zone are especially susceptible to corrosion because of a strong chloride concentration as well as a minimum amount of oxygen. A high concentration of chloride ions and a sufficient amount of oxygen are present in this area causing the corrosion of reinforcements This area represents the most unfavourable zone for the lifespan of structure. Fazli et al [18] studied the effects of marine environmental conditions on the bonded and bare surfaces of concrete slabs by means of the pull-off test They observed that 12 months of exposure in a marine environment has a low effect on the epoxy performance between carbon fibrereinforced polymer composite and concrete. The average compression strength of concrete at 28 days is equal to 32.65 MPa
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