Abstract
In this paper, corrosion in overhead line foundations in different field environmental conditions (plain, agricultural and coastal/industrial region) have been detected by non-destructive test methods such as Half-cell potential test, Ultrasonic pulse velocity test, Rebound hammer test, chemical analysis of soil and Transmission Line Tower (TLT) footing concrete samples and scanning electron microscope (SEM) analysis of deteriorated tower footing concrete. The collected soil samples have been analyzed for chemicals and the TLT coping concrete samples have been tested using scanning electron microscope. The correlation between the test values, mineralogical composition of soil and concrete samples at tower footing level is presented.
Highlights
All over the world, the transmission towers have to be erected in open lands or dense forests where an extreme climatic condition exists
A Novel technique of retrofitting of corrosion damaged RCC foundations of transmission towers exposed to marine environment using wrapping of fiber reinforced plastic (FRP) composite have been investigated by Mangesh V
In order to understand the influence of chemicals present in the soil around the Transmission Line Tower (TLT) stub, soil samples have been collected from the locations considered and they were tested in a reputed research lab
Summary
The transmission towers have to be erected in open lands or dense forests where an extreme climatic condition exists. Transmission towers existing in coastal areas are affected by chloride environments. The Overhead lines erected in industrial areas are very much affected by industrial wastes and other chemical pollutants where sulphate/sulphide attacks are predominant. Overhead lines running through agricultural fields are affected by fertilizers like ammonia and other manures. Such environments cause adverse effect on durability of TLT foundations leading to deterioration of chimney concrete, and corrosion of stubs. More and more investigative studies are going on around the world to detect, prevent and to repair the corrosion defects in TLT foundations
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