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Risk assessment of early concrete cracks based on distributed optical fiber temperature sensing

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Document pages: 13 pages

Abstract: Cracks often occur in concrete arch dams due to the low temperature stress and early tensile strength of concrete. There are three common temperature control measures: controlling casting temperature, embedding cooling pipe and protecting surface. However, because it is difficult to obtain accurate concrete temperature field and temperature stress field, the rationality and economy of these measures have not been effectively evaluated before and after construction. This paper establishes a set of early concrete crack risk assessment system, including distributed optical fiber temperature sensing (DTS), temperature field and stress field prediction and crack risk assessment. Based on DTS temperature data, the thermal parameters are retrieved by back analysis methodrs of concrete. Then, the temperature and thermal stress of early age concrete are predicted using the reversed thermal parameters, as well as the laboratory test parameters. Finally, under the proposed cracking risk evaluation principle, the cracking risk level of each concrete block is given; the preliminary and later temperature controlling measures were recommended, respectively. The application of the proposed system in Xiluodu super high arch dam shows that this system works effectively for preventing cracks of early age concrete.

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