Rapid Shape Analysis of Crushed Stone Using Image Analysis

The shape and texture of construction aggregates are important parameters that have a direct bearing on the strength and durability of their asphalt and concrete end products. Although shape standards may vary throughout the world, nearly every country characterizes shape in terms of elongation and flatness. Typically, a given batch of material is rejected if more than a specific percentage of particles have elongation and flatness ratios which exceed some limit. Present procedures for determining these ratios rely on manual techniques which are tedious and tend to limit the number of samples that can be analyzed. Researchers at Virginia Tech have recently developed a rapid shape analysis system which can determine elongation and flatness ratios for a standard batch of 100 particles in under 10 minutes. The system consists of an image analyzer constructed around a personal computer. Results obtained indicate an excellent agreement between the rapid analysis system and standard manual techniques. In addition, the system is capable of providing two quantitative measures of particle roughness. The development and validation of the analyzer and its measurement procedures are discussed.

Abstract licence: CC BY

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