THE CORROSION EFFECT OF SULFUR-REDUCING BACTERIA ON REINFORCED HIGH STRENGTH CONCRETE

Civil

Abstract

This study deals with the ability of the sulfur reducing bacteria to cause corrosion in reinforced concrete .The susceptibility of those bacteria to cause corrosion in reinforced concrete has been tested by using models manufactured in laboratory of construction tests of the college of engineering University of Diyala. where they were studying the effect of bacteria on the high strength concrete mix by using ordinary and sulfate-resistant cement and reinforced iron of 16 mm in different positions. The corrosion effort of reinforced concrete has been measured using a half-cell potential equipment. The effect of sulfur reducing bacteria on the high strength concrete mix with the use of sulfate-resistant cement has been less than its effect on the high- strength concrete mix with ordinary cement by 13%. This is due to the little amount of Mono ammonium tri-silica in high strength concrete and the paucity of porosity in the high strength concrete mix which leads to interference of effect between them and restricts the activity of the bacteria. Then, samples of mild iron have been used and the capacity of bacteria to cause corrosion have been studied with help of electronic scanning microscope.