American Society of Civil Engineers


Dimensional Ratios for Stone Aggregates from Three-Dimensional Laser Scans


by Hyoungkwan Kim, (Grad. Res. Asst., Dept. of Civ. Engrg., Univ. of Texas at Austin, Austin, TX 78712-1076. E-mail: hyoungkwan@mail.utexas.edu), Carl T. Haas, (Assoc. Prof., Dept. of Civ. Engrg., Univ. of Texas at Austin, Austin, TX 78712-1076. E-mail: haas@mail.utexas.edu), Alan F. Rauch, (Asst. Prof., Dept. of Civ. Engrg., Univ. of Texas at Austin, Austin, TX 78712-1076. E-mail: arauch@mail.utexas.edu), and Craig Browne, (Staff Engr., GeoSyntec Consultants, 532 Great Rd., Boxborough, MA 01719. E-mail: cbrowne@geosyntec.com)

Journal of Computing in Civil Engineering, Vol. 16, No. 3, July 2002, pp. 175-183, (doi:  http://dx.doi.org/10.1061/(ASCE)0887-3801(2002)16:3(175))

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Document type: Journal Paper
Abstract: The “laser-based aggregate system” (LASS) was developed to rapidly and accurately characterized the three-dimensional shape properties of unbound stone aggregates. A linear motion slide, a laser line scanner, and an integrated computer constitute the hardware of the LASS. Using profile data obtained from laser scans of aggregated particles spread out on a platform, the LASS software virtually rotates each irregularly shaped particle to determine the three principal dimensions used to characterize particle shape. The computational method employed can rapidly process the scanned data without losing critical information. Two hundred randomly selected particles, which have variable material and shape characteristics, were manually measured to obtain data that were then used to verify the accuracy of the LASS results. Good correlation with the manual measurements demonstrates that laser profiling has the potential tool for rapidly analyzing the dimensions of irregularly shaped objects, and could be used for quality-control testing and performance-related characterization of stone aggregate materials.


ASCE Subject Headings:
Aggregates
Imaging techniques
Dimensional analysis