An experimental study on the concrete hydration process using Fabry–Perot fiber optic temperature sensors
2012
Zou, Xiaotian | Chao, Alice | Tian, Ye | Wu, Nan | Zhang, Hongtao | Yu, Tzu Yang | Wang, Xingwei
This paper describes the contribution of Fabry–Perot (FP) fiber optic temperature sensor to investigate the effects of concrete hydration process. The FP temperature sensor was easily fabricated by controllable chemical etching and adjustable fusion splicing. Detailed optical properties of the sensor were theoretically analyzed and temperature calibration experiments were performed. A sensor with a 90μm cavity length was demonstrated to have a temperature sensitivity of 0.01nm/°C and the linearity coefficient of 0.99. Furthermore, the FP sensor was embedded in the concrete structure for sensing the temperature change during the early age of hydration. During the concrete hydration experiments, the measured peak temperatures of the concrete specimens with different water-to-cement (w/c) ratios of 0.4, 0.5 and 0.6 were 51.42°C, 52.88°C, and 55.08°C, respectively, corresponding to final setting times of 13.52h (w/c=0.4), 14.16h (w/c=0.5) and 15.2h (w/c=0.6) after concrete casting. Temperature profiles will be used for concrete hydration heat study, which will help us to have a better understanding of cement hydration behavior.
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