Abstract
Abstract. The purpose of this research is to extract spectral reflectance characteristics of concretes through basic experiment on concrete specimens and site experiment on actual concrete structures using a field portable spectrometer and a VNIR hyperspectral sensor. A spectrometer (GER-3700) and a VNIR hyperspectral camera (AisaEagle VNIR Hyperspectral Camera) were utilized for extracting spectral characteristics of concrete specimens and actual concrete structures. General concretes show similar pattern with correlation more than 80%, while super high strength concrete shows very different aspect from general concretes. The GER-3700 spectrometer and the VNIR camera were applied to extracting spectral characteristics of the actual concrete structures such as a bridge slab and pier in road construction site. We also made certain in not only interior experiment on concrete specimens but also site experiment on actual concrete structures that both the spectrometer and the VNIR camera vary in spectral reflectance depending on concrete strength. Afterwards if the studies on hyperspectral characteristics of worn-out concretes, concrete aggregate condition diversity, super high-strength concretes are performed in depth, it is helpful in stability evaluation and maintenance management of concrete-based structures or facilities using airborne or satellite hyperspectral images for a wide area.
Highlights
Necessity of system development and improvement related to concrete characteristics is recognized largely with regulation establishment for maintenance of concrete facilities in construction markets
If spectral characteristics according to concrete conditions can be understood, hyperspectral imagery may be applied as a useful instrument for surveying the current state for a number of concrete structures or facilities distributed in an urban area
Hyperspectral imagery has been used to detect and map a wide variety of materials having characteristic of reflectance spectra
Summary
: Recently necessity of system development and improvement related to concrete characteristics is recognized largely with regulation establishment for maintenance of concrete facilities in construction markets. We set to work on this research based on the idea that hyperspectral remote sensing might be utilized for monitoring concrete structures. If spectral characteristics according to concrete conditions can be understood, hyperspectral imagery may be applied as a useful instrument for surveying the current state for a number of concrete structures or facilities distributed in an urban area. The use of reflectance spectroscopy across the visible near- and short-infrared spectral region (400 to 2500 nm) was suggested as a tool to assess the status of concrete in situ(Anna Brook and Eyal Ben-Dor, 2011). The purpose of this research is to extract spectral reflectance characteristics of concretes through basic experiment and onsite experiment using a spectrometer and a VNIR hyperspectral sensor. A spectrometer (GER-3700) and a VNIR hyperspectral camera (AisaEagle VNIR Hyperspectral Sensor) were utilized for extracting spectral characteristics of concrete specimens and actual concrete structures
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