Evaluation of Pavement Stripping Using Ground-Penetrating Radar: A Case Study
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ORIGINAL PAPER
Evaluation of Pavement Stripping Using Ground-Penetrating Radar: A Case Study Kasinathan Muthukkumaran1
•
Nandhagopal Raja1 • Umanath Umaiyan1
Received: 6 August 2020 / Accepted: 22 October 2020 Indian Geotechnical Society 2020
Abstract Non-destructive testing techniques are highly valuable in the present day scenario as it can save money and time for the qualitative evaluation of any site. This paper presents a case study utilizing one such technique, employing a ground-coupled Ground-Penetrating Radar (GPR). The GPR was used to estimate the damages to the pavement and underlying subgrade soil at Cochin International Airport Limited (CIAL), Cochin, Kerala, India. The state of Kerala received 75% more than expected rainfall in the monsoon of 2018 and hence, faced one of the worst natural disasters in the form of floods between July and August. Therefore, a subsurface survey was performed at CIAL to analyse the pavement area and identify any detrimental effects caused by the floods. The subsurface survey scope was to image the subsurface to an approximate depth of 2–3 m to map the anomalies and quantitatively evaluate the affected areas of the runway, taxiways, and the link-ways. Non-destructive testing was opted not to affect the regular operations at the airport. This investigation involved the use of remote measurement methods, and therefore, all the findings presented here are the result of the measurement and interpretation of GPR data. The analysis was performed using a dedicated data analytics software called RADAN7. Based on the analysis, a quantitative criterion called the ‘‘stripping index’’ has been & Kasinathan Muthukkumaran [email protected] Nandhagopal Raja [email protected] Umanath Umaiyan [email protected] 1
Department of Civil Engineering, National Institute of Technology, Tiruchirappalli 620015, India
computed to define the degree of damages sustained by the pavement and its underlying layers. The results are both graphically and quantitatively discussed in this paper. Keywords Ground-penetrating radar Runway pavement Non-destructive testing Stripping index Pavement de-bonding
Introduction Ground-Penetrating Radar (GPR) is a subsurface imaging device. GPR uses electromagnetic radiation of frequencies falling in the radio spectrum to transmit, receive, and eventually develop the subsurface image. In general, the radar pulses travel through the subsurface material at a velocity proportional to that media’s electrical characteristics. The propagation (and reflection) of the radar impulse depends on the di-electrical properties of the groundmass being investigated, and therefore, the presence of any moisture content dramatically influences it. It works by sending a tiny pulse of energy into the subsurface from the ground level and records the reflected signals’ strength and the time taken for its return. A series of such cycles over an area make up a scan. Reflections are produced whenever the energy pulse enters into a material with different electrical conducti
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