Martin Marietta Materials, Inc.

David W Jahn

Patrick A Jacomet

A method and apparatus for performing multiple ratio analysis of aggregate particles, wherein the method includes the steps of measuring a first maximum dimension of a particle, measuring a second maximum dimension of a particle in a direction substantially perpendicular to the first maximum dimension, and inputting the first maximum dimension and second maximum dimension into a computer having a processor. Using the computer, a particle ratio of the first maximum dimension to the second maximum dimension for the measured particle is computed and the particle ratio is classified into one of a predetermined plurality of different ratio ranges, each of these plurality of different ratios representative of a different range of particle shapes. An apparatus for multiple ratio analysis includes a measurement device configured to measure a dimension of an aggregate particle along at least one axis at a time, a computer, and a program or instruction set permitting calculation of an aggregate particle ratio for the aggregate particle and classifying this aggregate particle ratio, as noted.

Method and apparatus for evaluation of aggregate particle shapes through multiple ratio analysis

An apparatus for measuring dimensions of particles includes a base. At least three fixed posts are mounted to the base. A swinging arm is pivotally mounted to the base about a pivot point. The swinging arm has a first section mated with a first of the at least three fixed posts, a second arm mated with a second and a third of the at least three fixed posts, and a third section connecting the first and second sections. The first section has a first length and the second section has a second length. A first opening is formed when the first section and the first fixed post are not in contact. Second and third openings are formed when the second section does not contact the second and third fixed posts.

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Cincinnati, OH, United States of America

David W Jahn