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Scheme Design and Experimental Study of Selective Thermal Stimulation for Concrete Microcracks Based on IR Thermography

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Abstract

In this paper, we propose a novel detection technology to telemeter microcracks in concrete structures using an infrared thermal imager carried by an unmanned aerial vehicle and explore the thermal excitation method applicable to it. Moreover, this paper presents a selective thermal stimulation scheme design for microcracks in concrete, in which NaAlO2 and NaHCO3 solutions, whose temperatures are higher than the air temperature, were chosen as the stimulation sources, and relevant experimental studies were conducted. Simultaneously, the heat generation mechanism from the microcrack stimulation was studied. Thereafter, through the thermal stimulation test of prefabricated microcracks, the effects of different amounts of stimulation reagents and different stimulation times on the detection of microcracks were determined by controlling the variables and discussing each stimulation parameter. Furthermore, the optimum reagent dosage and best detection time window were determined. The actual microcracks on a concrete beam were used to verify the test scheme, and a good incentive effect was obtained.

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Funding

This work was supported by the Special Fund of the Chinese Central Government for Basic Scientific Research Operations in Commonwealth Research Institutes (Grant No. Y419017), the National Key Research and Development Plan of China (Grant No. 2018YFC0407102), and the National Key Research and Development Plan of China (Grant No. 2016YFC0401610).

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Authors and Affiliations

  1. Nanjing Hydraulic Research Institute, Nanjing, 210029, China

    Yulei Wang, Lei Tang, Yu Jia & Shenghang Zhang

  2. College of Civil and Transportation Engineering, Hohai University, Nanjing, 210098, China

    Yulei Wang

  3. College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, 210098, China

    Yu Jia

  4. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing, 210029, China

    Yulei Wang, Lei Tang, Yu Jia & Shenghang Zhang

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  1. Yulei Wang
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  2. Lei Tang
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  3. Yu Jia
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  4. Shenghang Zhang
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Correspondence to Lei Tang.

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Wang, Y., Tang, L., Jia, Y. et al. Scheme Design and Experimental Study of Selective Thermal Stimulation for Concrete Microcracks Based on IR Thermography. J Nondestruct Eval 40, 32 (2021). https://doi.org/10.1007/s10921-021-00756-y

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  • DOI: https://doi.org/10.1007/s10921-021-00756-y

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