Abstract
Pavements always play a predominant role in transportation. Health monitoring of pavements is becoming more and more significant, as frequently suffering from cracks, rutting, and slippage renders them prematurely out of service. Effective and reliable sensing elements are thus in high demand to make prognosis on the mechanical properties and occurrence of damage to pavements. Therefore, in this paper, various types of functionality enhancement of industrialized optical fiber sensors for pavement monitoring are developed, with the corresponding operational principles clarified in theory and the performance double checked by basic experiments. Furthermore, a self-healing optical fiber sensing network system is adopted to accomplish full-scale monitoring of pavements. The application of optical fiber sensors assembly and self-healing network system in pavement has been carried out to validate the feasibility. It has been proved that the research in this article provides a valuable method and meaningful guidance for the integrity monitoring of civil structures, especially pavements.
Highlights
A large number of structures built decades ago are in urgent need of strengthening, rehabilitation and replacement, and structural health monitoring (SHM) has emerged as a diagnostic tool to monitor in-situ structure behavior accurately and efficiently [1,2,3,4]
Due to the complex characteristics of pavement structures, few available references provide definite specifications on their mechanical properties, and SHM is regarded as a feasible way to abstract this information
Optical fiber been selected as sensing element, but its design should take the special features of asphalt pavement into consideration
Summary
A large number of structures built decades ago are in urgent need of strengthening, rehabilitation and replacement, and structural health monitoring (SHM) has emerged as a diagnostic tool to monitor in-situ structure behavior accurately and efficiently [1,2,3,4]. It is expected that SHM will take shape into an approach, which stands shoulder to shoulder with traditional methods, namely theory, experiments and numerical analysis, to extract the mechanical properties of structures Among these components, OF sensors and Fiber Bragg grating (FBG) sensors, for the advantages of long-term stability and durability, good geometrical shape-versatility, corrosion resistance, anti-electromagnetic interference, low cost and high precision detection, have found wide-spread application [7,8,9,10,11]. An OF sensor based on Fabry-Perot (F-P) technology was introduced to detect strain of cold in-depth recycled utilizing foamed asphalt [47] These sensors could realize their function to some extent, but employing steel pipe, FRP, and PP as cladding material, the coordinate deformation between protective layer and asphalt mixture couldn’t be well resolved, which directly led to low precision. A study of a three-layered asphalt pavement embedded with armoring pipe packaged FBG and OF sensors is conducted on site to check the influence of environmental temperature changes on asphalt pavement strain
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