Journal of Materials and Engineering Structures
Volume 9, Numéro 4, Pages 539-546
2022-12-30

Concrete Beams Using Seawater And Sea Sand Reinforced With Steel And Gfrp Rebars Exposed To Marine Environment: An Experimental Study



Authors : Phan Duy Nguyen . Dang Vu Hiep . Ngoc Anh Vu . Vinh An Le .

Abstract

Using fresh water and river sand in concrete mix composition makes a lot of negative impacts on resources and the environment while the source of sea sand and sea water is abundant and less harmful to the environment. However, sea sand and seawater in concrete can cause severe corrosion of the reinforcement, reducing the durability and bearing capacity of the structure. This paper illustrates the results of a comparative study on the flexural behavior of six corroded seawater sea-sand concrete (SWSSC) beams. The corrosion process of two concrete beams reinforced with traditional steel bars and four concrete beams reinforced with a combination of glass fiber reinforced polymer (GFRP) and steel bars was coupled by the effect of seawater exposure and sustained load. It was found that after exposure to a marine environment during the period of 60 months the GFRP bar retains surface integrity, meanwhile, the steel bars were significantly corroded with a cross-sectional area loss of approximately 13.93%. The decrease in bending stiffness, yield load, and ultimate load of the RC beams was found due to the deterioration of SWSSC and corrosion of steel bars.

Keywords

Flexural behaviour ; Corrosion ; Seawater and sea sand concrete (SWSSC) ; Glass fiber reinforced polymer (GFRP)

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