| Title |
Rebar Corrosion Model in Concrete Structures using Digital Thermographic Data |
| Authors |
Roh Young-Sook ; Chung Lan ; Park Hyun-Soo |
| Keywords |
Reinforcement Rebar Corrosion ; Corrosion Rate ; Digital Image Data ; Mechaelis-Menten Equation |
| Abstract |
The applicability of digital thermography for detection of rebar corrosion which embedded in reinforced concrete structures is described. A passive thermographic measurement system is utilized to obtain strong infrared radiation from embedded reinforcing rebar. The thermal radiation from concrete surface is measured on a total of 6 different corrosion rates(0%, 1%, 3%, 5%, 7%, and 10% of weight loss). And each corrosion rates have 3 different concrete cover depths(10mm, 20mm, and 30mm). The phases of thermal image were changed with different corrosion rates and different concrete cover depths. This study also proposed a new rebar corrosion model that can quantitatively measure the corrosion level of a reinforcing rebar using Michaelis-Menten equation. From this study, we found out that there exists a certain corrosion level which between 1% to 2% of corrosion rate, tentatively designated 'compact corrosion state', and this compact corrosion state acts like an insulation around corroded rebar so that the minimum amount IR radiation emits from reinforcing rebar. The thermal radiation increases as corrosion rate is increased proportionally after passing this compact corrosion state. The corrosion growth stage followed by compact corrosion has been named with 'non-compact corrosion state' in this study. |