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Experimental study on strain and deformation monitoring of asphalt structures using embedded fiber optic sensor

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Abstract

True strain distribution measurement has been accomplished with the use of Brillouin scattering in optical fibers. Therefore, the application of fiber optic sensors in civil engineering has recently increased, especially in concrete and earth structures. Asphalt structures have unique advantages in terms of flexibility and water sealing, but they present difficulties in embedding sensors because of the temperature- and time-sensitive behavior of asphalt mixtures. Over the transition temperature, the transferred stress from a loaded asphalt structure to an embedded sensor is drastically decreased, leading to inferior sensitivity of the sensor due to the low elastic modulus of asphalt. This paper presents experimental evidence that a flexible fiber optic sensor can contribute to strain and deformation monitoring for an asphalt structure even if the elastic modulus of asphalt is varied by temperature. Based on investigations on both prism specimens and a paved cantilever with the developed sensor coated with polyethylene, it can be stated that the sensor directly monitors asphalt behavior over a wide range of temperatures. According to the results of another test on a full-sized asphalt-layered slope constructed with heavy machinery, the sensor survived and successfully detected the change in strain caused by the force on the surface of the structure. Furthermore, a post-processing method of measurement to stabilize data fluctuations derived from skewed initial pre-tensioning on the sensor is proposed and evaluated.

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Authors and Affiliations

  1. Kajima Technical Research Institute, Tokyo, Japan

    Michio Imai & Satoru Miura

  2. Hokudenkogyo Co. Ltd., Sapporo, Japan

    Yoshiichi Igarashi

  3. Hokkaido Power Co. Inc., Sapporo, Japan

    Masanori Shibata

Authors
  1. Michio Imai
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  2. Yoshiichi Igarashi
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  3. Masanori Shibata
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  4. Satoru Miura
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Correspondence to Michio Imai.

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Imai, M., Igarashi, Y., Shibata, M. et al. Experimental study on strain and deformation monitoring of asphalt structures using embedded fiber optic sensor. J Civil Struct Health Monit 4, 209–220 (2014). https://doi.org/10.1007/s13349-014-0077-4

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  • DOI: https://doi.org/10.1007/s13349-014-0077-4

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