Feasibility of one side 3-D scanning for characterizing aggregate shape
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The objective of this paper is to investigate the feasibility of one side 3-D scanning (OSS) method for the shape characterization of aggregate particles in 3-D. Seventy two typical crushed stone particles and 77 typical gravel particles were selected for the investigation. Each selected particle was tested 3 times by the OSS method using a handheld 3-D laser scanner with randomly resting it on a flat plane. The size and shape indicators were calculated for each OSS test and the optimized results were also obtained by a proposed optimizing procedure in accordance with the results of th e 3 times of OSS tests. The whole digital particle (WDP) data of each selected particle was acquired at the same time and the WDP based size and shape indicators were calculated as the references of the feasibility investigation. The statistical tests of all sizes and shape indicators between each OSS based result set and WDP based result set were performed. The OSS based length (L) and thickness (T) show good reliability for each test. Not every OSS test can obtain reliable results of width (W). However, the optimized results of all the 3 OSS based size indicators have enough reliability. All the shape indicators derived from the optimized OSS based size indicators also have enough reliability. The OSS method with employing the optimized results based on multiple (3 or more) tests is statistically feasible. And it is a time-saving way which is suitable for extensive testing in engineering application.
KeywordsAggregate particle shape Aggregate particle size 3-D scanning Whole digital particle
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