Browsing by Author "Biresaw, Muluye"

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    Effect of Salt Water on Compressive Strength Of Plain Mass Concrete
    (AAU, 2018-06) Biresaw, Muluye; Girma, Zerayohannes
    In this research work, the effect of salt water on compressive strength of plain mass concrete had been investigated. This paper therefore presents the results and findings of an experimental research on the effect of salt water on compressive strength of concrete. For this, fifty four (54) concrete cubes were cast; 9 cubes were cast using clean water,9 cubes were cast using a salt water sample prepared by adding 10 g sodium chloride salt per liter of clean water, 9 cubes were cast using a salt water sample prepared by adding 20 g sodium chloride salt per liter of clean water, 9 cubes were cast using a water sample prepared by adding 30 g sodium chloride salt per liter of clean water, 9 cubes were cast using a salt water sample prepared by adding 35 g sodium chloride salt per liter of clean water and the remaining 9 cubes were cast using salt water sample prepared by adding 40 g sodium chloride salt per liter of clean water. Design mix of C-25 with mix ratio 1:2.2:2.9 and 0.45 water- cement ratio was prepared for this research work. The concrete cubes were cured separately and cured for 7, 28 and 45 days. i.e. concrete cubes casted by using clean water were cured in clean water, concrete cubes casted by using a salt water samples with a concentration of 10 g ,20 g,30 g,35 g and 40 g sodium chloride salt per liter of clean water were cured in a salt water with a concentration of 10 g ,20 g ,30 g,35 g and 40 g sodium chloride salt per liter of clean water respectively. The results of the average compressive strengths of concrete cubes both mixed and cured by clean water were 25.61,37.46 and 39.58 in MPa, The results of the average compressive strength of concrete cubes both mixed and cured by salt water with a concentration of 10 g sodium chloride salt per liter of clean water were 31.28,39.07 and43.85 MPa , the result of the average compressive strength of concrete cubes both mixed and cured by salt water with a concentration of 20 g sodium chloride salt per liter of clean water were 31.87,40.59 and 43.95 MPa, the result of the average compressive strength of concrete cubes both mixed and cured by salt water with a concentration of 30 g sodium chloride salt per liter of clean water were 32.34,42.03 and 45.34 MPa, the result of the average compressive strength of concrete cubes both mixed and cured by salt water with a concentration of 35 g sodium chloride salt per liter of clean water were 34.21,42.27 and 45.53 MPa and the result of the average compressive strength of concrete cubes both mixed and cured by salt water with a concentration of 40 g sodium chloride salt per liter of clean water were 36.26,44.92 and 43.57 MPa for the hydration period of 7, 28, and 45 days respectively. From the laboratory test result, it was discovered that when we use salt water both in mixing and curing purpose in the concrete production, the compressive strength of plain mass concrete was increased.