Development of Optical Fiber Sensor for Monitoring Concrete Performance
H. Hamada, T. Yamaji, K. Hayakawa, and H. Yamashita
Appears on pages(s):
concrete (structural); deterioration; sensor
In this study, two types of optical fiber sensors attached on the concrete surface, called a Straight-type sensor and Loop-type sensor were developed. Through bending tests of RC beam specimens, detailed data on beam deflection and optical performance of attached fiber were collected. Overall performance of the optical fiber sensor as a concrete performance monitor is discussed. Test procedures, test results and their discussions are summarized. Based on the experimental result, several conclusions were obtained. 1) The adhesion of epoxy resin to concrete surface is not lost until ultimate concrete failure. 2) The sensitivity of the Straight-type sensor is affected by the angle of concrete cracking and optical fiber intersection. 3) The distance between cracking location and looped circle of optical fiber affects the sensitivity of the Loop-type sensor. 4) Both for the straight type and the loop type, in order to develop a satisfactory level sensor, further research is strongly recommended.