Browsing by Subject "Fourier transforms"

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    Evaluation of Bio-Fog Sealants for Pavement Preservation
    (Center for Transportation Studies, University of Minnesota, 2016-06) Ghosh, Debaroti; Turos, Mugur; Marasteanu, Mihai
    Pavement preservation is playing an increasingly significant role in maintaining our aging pavement infrastructure. One important component is the application of sealants to the pavement surface. In a joint study between MnDOT and the University of Minnesota, the field performance and mechanical properties of asphalt mixtures from pavement sections treated with a number of new products, called bio sealants, is investigated. The objective of the study is to obtain relevant properties of treated asphalt materials to understand the mechanism by which sealants improve pavement performance. Laboratory testing was performed on treated asphalt binder and mixtures. For binders, a dynamic shear rheometer and a bending beam rheometer were used to obtain rheological properties of treated and untreated asphalt binders. Field cores from both untreated and treated sections were collected and thin beam specimens were prepared from the cores to compare the creep and strength properties of field-treated and laboratory-treated asphalt mixture. It is observed that the oil-based sealants have a significant softening effect on the control binder compared to the water-based sealants. For asphalt mixtures, different trends are observed for the field samples compared to the laboratory prepared samples. Similar to binder results, significant differences are observed between the asphalt mixtures treated with oil-based and water-based sealants, respectively. From the analysis performed on the bending creep and strength results at low temperature, it is concluded that the application of sealants in the field have no significant effect on these properties. Fourier transform infrared spectroscopy (FTIR) analysis showed that the sealant products could not be detected in mixture samples collected from the surface of the treated section.
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    Supplementary Data for Reconstructing Past Craft Networks: A case study using 3D scans of Late Bronze Age swords to reconstruct specialized craft networks, PhD. Dissertation
    (2016-05-18) Golubiewski-Davis, Kristina M; golu0011@umn.edu; Golubiewski-Davis, Kristina M
    The data included here are supplemental data associated with the dissertation "Reconstructing Past Craft Networks: A case study using 3D scans of Late Bronze Age swords to reconstruct specialized craft networks." by Kristina Golubiewski-Davis. The dissertation is an examination of Late Bronze Age sword smiths wherein the author uses shape data as an indication of manufacture choices to reconstruct possible social networks. Included are .csv files of the Network matrices, blade profile .bmp images, Fourier transform data, and the data gathered for statistics. Also included is the annotated SAS routine used to analyze the data. The Data were analyzed using SHAPE V1.3, SAS 9.4, and GEPHI 0.8.2. The data is being released with the publication of the dissertation.