Vol. 3 Issue 3
Year:2014
Issue:Sep-Nov
Title:Corrosion Resistance Of M100 Grade Concrete Using Quartz Sand And Quartz Fillers In Hybrid Fiber Reinforced Self Compacting Concrete
Author Name:B. Narendra Kumar, P. Srinivasa Rao, K.Rajesh and R. Krishneswar
Synopsis:
Cement concrete is porous in its basic structure as a result of which permeation of air, moisture and other deleterious agents occur, causing corrosion of reinforcement. Corrosion is defined as the deterioration of a material through a chemical or electrochemical reaction with its environment. The phenomenon of corrosion of reinforcement bar in concrete is a time dependent process. Under severe environmental conditions also, it takes years for the steel reinforcement to be corroded and to cause deterioration of Reinforced Concrete (RC) structures. However when it becomes imperative to evaluate the relative performance of different types of steel and binder in a short time, the accelerated corrosion test can be adopted. Effort has been made to present the corrosion resistance of M100 High Strength Self Compacting Concrete (HSSCC) with and without adding Hybrid fibers (Steel Fibers with aspect ratio 60:1 and Glass Fibers with aspect ratio 857:1). The specimens are tested after 28 days of curing. The corrosion process is initiated by applying a constant voltage of 6 volts to the system in which concrete specimens of 100x200mm cylinders with concentrically embedded rebar of 10mm are placed in NaCl solution of 1.2 molarity. The specimens are visually inspected at regular intervals of time for the onset of cracks. The accelerated corrosion test is terminated after cracking of the specimen is observed i.e., when there is onset of a large current increase corresponding to time and the results are interpreted in a current-time graph.
Year:2014
Issue:Sep-Nov
Title:Corrosion Resistance Of M100 Grade Concrete Using Quartz Sand And Quartz Fillers In Hybrid Fiber Reinforced Self Compacting Concrete
Author Name:B. Narendra Kumar, P. Srinivasa Rao, K.Rajesh and R. Krishneswar
Synopsis:
Cement concrete is porous in its basic structure as a result of which permeation of air, moisture and other deleterious agents occur, causing corrosion of reinforcement. Corrosion is defined as the deterioration of a material through a chemical or electrochemical reaction with its environment. The phenomenon of corrosion of reinforcement bar in concrete is a time dependent process. Under severe environmental conditions also, it takes years for the steel reinforcement to be corroded and to cause deterioration of Reinforced Concrete (RC) structures. However when it becomes imperative to evaluate the relative performance of different types of steel and binder in a short time, the accelerated corrosion test can be adopted. Effort has been made to present the corrosion resistance of M100 High Strength Self Compacting Concrete (HSSCC) with and without adding Hybrid fibers (Steel Fibers with aspect ratio 60:1 and Glass Fibers with aspect ratio 857:1). The specimens are tested after 28 days of curing. The corrosion process is initiated by applying a constant voltage of 6 volts to the system in which concrete specimens of 100x200mm cylinders with concentrically embedded rebar of 10mm are placed in NaCl solution of 1.2 molarity. The specimens are visually inspected at regular intervals of time for the onset of cracks. The accelerated corrosion test is terminated after cracking of the specimen is observed i.e., when there is onset of a large current increase corresponding to time and the results are interpreted in a current-time graph.
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