caa a22 4500 606172955 CHVBK 20210128100730.0 cr unu---uuuuu 210128e20150901xx s 000 0 eng 10.1007/s10921-015-0291-y doi (NATIONALLICENCE)springer-10.1007/s10921-015-0291-y Experimental Validation of a Numerical Model for Simulating Radiographic Imaging of Portland Cement-Based Materials [Elektronische Daten] [W. Keller, S. Pessiki] This paper presents a numerical modeling approach, developed within the CIVA RT virtual radiography software, for simulating radiographic imaging of Portland cement-based materials. The modeling approach is validated experimentally for 20 and 30cm thick Portland cement concrete specimens, which were imaged over a range of source intensities using a 450keV COMET MXR-451 X-ray tube. Both a discrete coarse aggregate (DCA) model and a computationally efficient homogenized concrete (HC) model were investigated. The study found that for concrete sections thicker than 10cm, the HC model provides radiation transmission predictions comparable to the DCA model, which was attributed to the increase in photon scattering with specimen thickness. The experimental validation study utilized film-based radiography and considered target optical density measurements of 1.0, 2.0, and 3.5. In general, numerical predictions from the virtual radiography model were in good agreement with the experimental data. For the 20cm thick specimens, relative error in the numerical predictions ranged from 18 to 20%. Relative error in numerical predictions for the 30cm thick specimens ranged from 4 to 8%. The improvement in model prediction accuracy for the thicker specimens was attributed to increased filtration of lower energy radiation, which reduced the influence of approximation error in the lower energy region of the photon emission spectrum. Springer Science+Business Media New York, 2015 Concrete nationallicence Imaging nationallicence Numerical simulation nationallicence Portland cement nationallicence Radiography nationallicence Keller W. Center for Advanced Technology for Large Structural Systems (ATLSS), Lehigh University, 117 ATLSS Drive, 18015, Bethlehem, PA, USA aut Pessiki S. Department of Civil and Environmental Engineering, Lehigh University, 13 E. Packer Ave., 18015, Bethlehem, PA, USA aut Journal of Nondestructive Evaluation Springer US; http://www.springer-ny.com 34/3(2015-09-01), 1-13 0195-9298 34:3<1 2015 34 10921 https://doi.org/10.1007/s10921-015-0291-y text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10921-015-0291-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Keller W. Center for Advanced Technology for Large Structural Systems (ATLSS), Lehigh University, 117 ATLSS Drive, 18015, Bethlehem, PA, USA aut NATIONALLICENCE 700 1- Pessiki S. Department of Civil and Environmental Engineering, Lehigh University, 13 E. Packer Ave., 18015, Bethlehem, PA, USA aut NATIONALLICENCE 773 0- Journal of Nondestructive Evaluation Springer US; http://www.springer-ny.com 34/3(2015-09-01), 1-13 0195-9298 34:3<1 2015 34 10921