Abstract
In this paper, the effect of seawater on concrete mix was studied. Seawater was fetched from the Red Sea near Port Sudan. Forty eight concrete cubes were prepared using constant water/cement ratio. The first two groups were both mixed with fresh water then cured in fresh water and seawater, respectively. The third and fourth groups were both mixed with seawater but cured in seawater and fresh water, respectively. All four groups were tested for permeability after seven days. Likewise, they were tested after 7, 28 and 90 days for compression strength. Twelve beams and a dozen cylinders were prepared in the same manner and tested after 28 days for both flexural and tension strengths. Slight increase in compressive strength was noticed in specimens mixed with fresh water and cured in seawater at 7 and 90 days, while no vital change was observed at age 28 days. Neither tension strength nor durability were affected with sea water. Nonetheless, flexural strength decreased for those specimens mixed with seawater and cured in fresh water.
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