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الثلاثاء، 5 أغسطس، 2014

Corrosion Inhibitors in Concrete

Author        : Shimaa Youssef Mohamed
 Degree        : M.Eng. Structural
Title: Corrosion Inhibitors in Concrete
Abstract:
Chapter one contains general introduction of corrosion and its significant deterioration on the reinforced concrete structures, its high cost of repairs, and corrosion protection systems to mitigate the corrosion problems.
Chapter two gives some definitions of corrosion, mechanism of corrosion, reasons of corrosion, some methods of detecting and monitoring corrosion, and some methods of corrosion prevention. This chapter gives definition of corrosion inhibitor, classification of inhibitor, advantages of corrosion inhibitors, mechanism of inhibitor, effect of corrosion inhibitor on properties of concrete, effect on corrosion of reinforcement, and field tests and experience with corrosion inhibitors.
Chapter three yields the properties of using materials in this study and experimental program. The studied variables include; (1) presence of chloride, chloride content takes the values of 0.20, 0.50, 0.80 and 1.4 of cement weight ;(2) presence of inhibitors and its content. Concrete with Sikaferrogard® -901 with content of 8, 12, and 16 kg/m ’ was used. Concrete with MCl 2005 with content of 1.19 kg/m ’, and concrete without inhibitors were also used. Slump test, compressive strength, splitting tensile strength test and accelerated corrosion test were performed. Cylinder specimens of75xl50 mm in dimension with steel bars of 12 mm diameter, 200 mm length placed in the middle of the specimens were used for accelerated corrosion test with a concrete cover 3.5 em. After curing, the specimens were placed in accelerated corrosion cell. The electrolyte in this cell was NaCl solution. A constant volt of 30 DC was applied between the anode (steel reinforcement) and cathode (copper plate). The current intensity was recorded with the time up to the appearance of 3 mm longitudinal crack for control specimens and 2 mm for other specimens .The time of the initial visible crack was also recorded during test. Corrosion was evaluated through the time at first crack, the critical time, the rate of weight loss of steel reinforcement and the critical corrosion tendency factor.
Chapter four contains the effect of using types of corrosion inhibitors with different dosages on slump of concrete, compressive strength, splitting tensile strength, relation between current intensity and time, the time at first crack, the critical time, the rate of weight loss of steel reinforcement and the critical corrosion tendency factor. Discussion about the results and the reasons of improvement of corrosion resistance for corrosion inhibitors are also given in this chapter.Corrosion of steel in concrete is the most important problem in maintenance of concrete structures. However, this problem has serious effects on infrastructure and economy that may be certainly reduced. This investigation aims to study the effect of using corrosion inhibitors to enhance the resistance of reinforcing steel against corrosion

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