Effect of Water Salinity on Concrete Strength

الملخص

Abstract: this paper to aim study the effect of mixing concrete with salinity of well water, sea water and fresh water on concrete strength. Forty-five (45) concrete cubes were used for testing. The mixing ratio for all mixtures was 1:1.68:3.33 and the ratio of water to cement was 0.6. The concrete cubes were first immersed in well water (water sample was taken from three different wells), and testing during a period of 7,28 and 60 days, respectively. The dissolved salts concentration for the first well was 2388 mg/L, and the average compressive resistance of concrete recorded was 19.4 N/mm², 26 N/mm² and 30.1 N/mm², respectively. For the second well, the dissolved salts concentration was 3114 mg/L, and the average compressive resistance was 23.9 N/mm², 35.5 N/mm² and 36.45 N/mm², respectively. And, the dissolved salts concentration was 3161 mg/L and the average compressive resistance was 15.95 N/mm², 28.4 N/mm² and 33.05 N^/mm² for the third well. The concrete compressive resistance to sea water during the test period was 17.55 N/mm², 27.15 N/mm² and 28.1 N/mm², respectively. For the reference sample, fresh water, the concrete compressive resistance during the same test period was 22.45 N/mm², 32.9 N/mm² and 36.73 N/mm². The results obtained for well water and sea water indicated an increase in concrete strength as the age of the concrete increased.