Keywords : Corrosion of Steel in Concrete
journal of kerbala university,
2008, Volume 4, Issue 2, Pages 121-139
In this investigation, the effect of using sodium benzoate, potassium dichromate as corrosion inhibitors in concentrations (1%, 2%and 3% by weight of cement) is studied on concrete properties; compressive strength, splitting tensile strength, flexural strength and absorption. Also the activity of these admixtures in their three concentrations were studied to reduce the corrosion rate where the three electrode polarization resistance is used to measure the corrosion rate and by measuring the electrical resistance of concrete. The reinforced concrete samples were immersed partially in 3.5% NaCl solution for three months. Half of these samples were loaded with 10% of the design load after 6 weeks of immersing to make micro cracks in the concrete body. The test results indicate that the use of sodium benzoate, potassium dichromate in 2% concrete. by weight of cement cause a considerable reduction in compressive strength about 15% and 4% at 28 days respectively, but in the later ages the specimens got an increase in compressive strength about 7% and 11% at 90 days respectively, with increasing in; splitting tensile strength about 17% for sodium benzoate and 21% for potassium dichromate, flexural strength about 18% and 20% respectively, also they cased reduction in absorption test with 38% and 42% respectively and inhibitor efficiency about 98% for each one.