Strain Behaviour of Exposed Steel Reinforcement Bars Using FBG Sensor

Abstract

Fiber Bragg grating (FBG) sensor system is being widely used as strain measurement system for civil structures. Nowadays, interest in using FBG sensor has been increased and widely used for health structural monitoring. In this paper, preliminary investigation on strain measurement for steel reinforcement bars due to different corrosion accelerated conditions is reported. The FBG sensors are used to measure the strain changes which the FBG sensor was glued to the surface of steel bars. Three (3) different corrosion accelerated conditions namely room temperature (RT), 5 % of sodium chloride (NaCl) solution and distilled water (DW) were used to develop the strain change in steel reinforcement. The results shows that the corrosion accelerated is significantly affect the overall strain change on the steel bars. FBG sensors are also able to capture the strain of steel bars due to corrosion accelerated variations. In addition, the results obtained from the FBG sensors reveal that the strain of steel rods immersed in 5 % NaCl solution was higher as compared to those immersed in distilled water and those exposed to room temperature.