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Three-dimensional shape analysis of coarse aggregates: New techniques for and preliminary results on several different coarse aggregates and reference rocks |
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| Authors: | ST Erdogan DW Fowler RA Livingston PM Ketcham SG Satterfield |
| Affiliation: | a Department of Civil Engineering, University of Texas, Austin, TX 78712, USA b Turner-Fairbank Research Center, Federal Highway Administration, McLean, VA 22101, USA c Materials and Construction Research Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA d Mathematical and Computational Sciences Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA |
| Abstract: | The shape of aggregates used in concrete is an important parameter that helps determine many concrete properties, especially the rheology of fresh concrete and early-age mechanical properties. This paper discusses the sample preparation and image analysis techniques necessary for obtaining an aggregate particle image in 3-D, using X-ray computed tomography, which is then suitable for spherical harmonic analysis. The shapes of three reference rocks are analyzed for uncertainty determination via direct comparison to the geometry of their reconstructed images. A Virtual Reality Modeling Language technique is demonstrated that can give quick and accurate 3-D views of aggregates. Shape data on several different kinds of coarse aggregates are compared and used to illustrate potential mathematical shape analyses made possible by the spherical harmonic information. |
| Keywords: | Image and shape analysis Aggregate Composite Modeling |
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