Christina Plati

Bio: Christina Plati is an academic researcher from National Technical University of Athens. The author has contributed to research in topics: Pavement engineering & Asphalt. The author has an hindex of 16, co-authored 76 publications receiving 844 citations. Previous affiliations of Christina Plati include National and Kapodistrian University of Athens.

Accuracy of pavement thicknesses estimation using different ground penetrating radar analysis approaches

Abstract: The Ground Penetrating Radar (GPR) is a Non-destructive Testing (NDT) technique, which is able to capture continuous pavement layer thicknesses data. The radar pulse propagation is a major factor for gathering the dielectric constants of pavement materials accurately. The present research focuses on the accuracy of pavement asphalt layer thicknesses estimation using GPR data analysis by employing different estimation approaches based on material dielectric properties. A comprehensive comparative analysis of GPR and asphalt-drilled cores data incorporating a variety of pavements is performed. The major findings of the detailed comparative analysis including the effectiveness of the approaches used are reported and discussed in the present paper.

Accuracy of Ground Penetrating Radar Horn-Antenna Technique for Sensing Pavement Subsurface

Abstract: Ground penetrating radar (GPR) is an intelligent sensor technique that has led to a powerful nondestructive testing (NDT) method for road pavement evaluation. Recent improvements in hardware and, in particular, software processing have contributed to the rapidly expanding popularity and usability of this technique in the pavement engineers community. In the present work, a GPR sensor system mounted on a driving van was used to acquire data from an asphalt pavement. Two different central frequency air-coupled horn antennas were used for data acquisition. The collected radar data was processed and analyzed in order for the accuracy of the antennas to be evaluated. For this purpose, the asphalt layer dielectric values and related thickness values were also estimated. Based on the GPR data analysis results, the performance of the two horn antennas in terms of sensing pavement subsurface is presented and discussed in the paper

Applications of Ground Penetrating Radar in civil engineering — COST action TU1208

Abstract: This paper focuses on the use of Ground Penetrating Radar (GPR) in civil engineering. Open issues in this field are identified and desirable advances in GPR technology, application procedures, data processing algorithms and analysis tools, are addressed. European associations, institutes and consortia interested in this topic are mentioned, together with the main relevant international events. The new COST (European COoperation in Science and Technology) Action TU1208 “Civil Engineering Applications of Ground Penetrating Radar” is presented, started in April 2013: this interdisciplinary project offers important research opportunities and will strengthen European excellence in all the fields concerning the success of GPR technique, with a main focus on its applications in civil engineering. Four Working Groups (WGs) carry out the research activities: WGI focuses on the design of innovative GPR equipment, on the building of prototypes, as well as on the testing and optimization of new systems; WG2 focuses on the GPR surveying of pavement, bridges, tunnels and buildings, as well as on the sensing of underground utilities and voids; WG3 deals with the development of electromagnetic forward and inverse scattering methods and of advanced data processing algorithms; WG4 explores the use of GPR in fields different from civil engineering and the integration of GPR with other nondestructive testing techniques. The COST Action TU1208 is still open to the participation of new parties: in this paper, information is provided for scientists and scientific institutions willing to join the Action and participate to its activities.

A review of Ground Penetrating Radar application in civil engineering: A 30-year journey from Locating and Testing to Imaging and Diagnosis

Abstract: The GPR (Ground Penetrating Radar) conference in Hong Kong year 2016 marked the 30th anniversary of the initial meeting in Tifton, Georgia, USA on 1986. The conference has been being a bi-annual event and has been hosted by sixteen cities from four continents. Throughout these 30 years, researchers and practitioners witnessed the analog paper printout to digital era that enables very efficient collection, processing and 3D imaging of large amount of data required in GPR imaging in infrastructure. GPR has systematically progressed forward from “Locating and Testing” to “Imaging and Diagnosis” with the Holy Grail of ’Seeing the unseen’ becoming a reality. This paper reviews the latest development of the GPR’s primary infrastructure applications, namely buildings, pavements, bridges, tunnel liners, geotechnical and buried utilities. We review both the ability to assess structure as built character and the ability to indicate the state of deterioration. Finally, we outline the path to a more rigorous development in terms of standardization, accreditation, and procurement policy.

Characterization of Cementitiously Stabilized Layers for Use in Pavement Design and Analysis

Abstract: This report presents information on the characterization of cementitiously stabilized layers and the properties that influence pavement performance. It also contains recommended performance-related procedures for characterizing these layers and performance-prediction models for incorporation into the mechanistic–empirical pavement analysis methods. Individual chapters highlight pavement distresses of hot-mix asphalt pavements and concrete pavements, laboratory tests and model development, and model calibration. The material contained in the report will be of immediate interest to state materials, pavement, and construction engineers and others involved in the different aspects of pavement design and construction.

Statistics: The Exploration and Analysis of Data

Abstract: these ideas, iterative algorithms are formulated for Ž nding optimum or nearly optimum designs for estimating the Ž rst order characteristics of the spatial process under study. Methods for Ž nding optimum designs are also presented for the case where measurements may be replicated in time, such as in the case of environmental monitoring. Chapter 6 treats the problem of Ž nding optimum designs for estimating second order characteristics of a spatial process such as variogram estimation. Again, classical theory is adapted to handle spatial correlations. Several algorithmic approaches are discussed and their performances compared. A method is proposed for combining designs that are optimum for different objectives to obtain a single design with good overall performance, although such a design may not necessarily be optimal for any of the individual objectives. In each chapter the theory is illustrated using spatial data related to the reconstruction of the Upper-Austrian sulfur dioxide monitoring network consisting of 17 monitoring sites. Additionally, using a second real example dataset, a list of exercises is developed. This dataset consists of Chloride measurements from 36 water quality monitoring stations in the Danube River Basin in central Lower Austria for the period 1992–1997. All of the data may be downloaded from http://statistik.wu-wien.ac.at/stat4/mueller/csd/data.zip. Adequate journal article and book references are given at the end of each chapter. There are seven appendices. Appendix A.1 gives a description of the two main data sets used in the book. Proofs of various nontrivial mathematical facts mentioned in the body of the book are given in Appendixes A.2 through A.6. According to the author, computations reported in the book were done using a program called D2PT which is written using GAUSS386 V3.2 (Aptech, 1993). An application module may be downloaded from http://statistik.wu-wien.ac.at/stat4/mueller/csd/d2pt.zip for the book. A description of the variables used in D2PT is given in Appendix A.7. A list of symbols used in the book and their meanings are given immediately following the Table of