Three-Dimensional Image Analysis of Aggregate Particles from Orthogonal Projections

Abstract

Digital image analysis provides the capability for rapid measurement of particle characteristics. When an image is captured and digitized, numerous measurements can be made in near real time for each particle. Usually, image analysis techniques treat particles as two-dimensional objects since only the two-dimensional projection of the particles is captured. In this study, three-dimensional analysis of aggregate particles that was performed by attaching aggregates in sample trays with two perpendicular faces is described. After the initial projected image of the aggregates is captured and measured, the sample trays are rotated 90 degrees so that the aggregates are now perpendicular to their original orientation and the dimensions of the aggregates in the new projected image are captured and measured. The long, intermediate, and short particle dimensions (d_L, d_I, and d_S, respectively) provide direct measures of the flatness and elongation of the particles. Some other shape indexes can also be derived from the measurements of area and perimeter length. The proposed image analysis method was verified by comparing the results obtained with manual measurements of particle dimensions for uniform size [passing 12.7 mm (1/2 in.) sieve and retained on 9.5 mm (3/8 in.) sieve] aggregates. Three-dimensional image analysis was also performed on five aggregates of standard size No. 89 from different sources, and the results are summarized herein. The proposed method is expected to improve field quality control of aggregates used in hot mix asphalt.

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References

Benson

F. J.

Effects of Aggregate Size, Shape, and Surface Texture on the Properties of Bituminous Mixtures-A Literature Survey. In Special Report 109, HRB, National Research Council, Washington, D.C., 1970, pp. 12–22.

Livneh

, and Greenshtein

Influence of Aggregate Shape on Engineering Properties of Asphaltic Paving Mixtures. In Highway Research Record 404, HRB, National Research Council, Washington, D.C., 1972, pp. 42–56.

Hargett

E. R.

Effect of Size, Surface Texture, and Shape of Aggregate Particles on the Properties of Bituminous Mixtures. In Special Report 109, HRB, National Research Council, Washington, D.C., 1970, pp. 25–26.

Murphy

C. P.

, Bullock

, and Turner

R. H.

The Measurement and Characterization of Voids in Soil Thin Sections by Image Analysis. Part 1, Principles and Techniques. Journal of Soil Science, Vol. 28, 1977a, pp. 498–508.

Murphy

C. P.

, Bullock

, and Biswell

K. J.

The Measurement and Characterization of Voids in Soil Thin Sections by Image Analysis. Part 2, Applications. Journal of Soil Science, Vol. 28, 1977b, pp. 509–518.

Schafer

, and Teyssen

Size, Shape, and Orientation of Grains in Sands and Sandstones-Image Analysis Applied to Rock Thin-Sections. Sedimentary Geology, Vol. 52, 1987, pp. 251–271.

Kuo

C.-Y.

, and Frost

J. D.

Quantifying the Fabric of Granular Materials-An Image Analysis Approach. Research Report GIT-CEE/ GEO-95-1. School of Civil and Environmental Engineering, Georgia Institute of Technology, 1995, 251 pp.

Hagerman

T. H.

Shape of Grains in Sand and Concrete Aggregate: Current Studies Using Image Analysis. Bulletin of the International Association of Engineering Geology, No. 30, 1984, pp. 229–233.

Yudhbir , and Abedinzadeh

Quantification of Particle Shape and Angularity Using the Image Analyzer. Geotechnical Testing Journal, GTJODJ, Vol. 14, No. 3, 1991, pp. 296–308.

10.

Howarth

D. F.

, and Rowlands

J. C.

Development of an Index to Quantify Rock Texture for Qualitative Assessment of Intact Rock Properties. Geotechnical Testing Journal, GTJODJ, Vol. 9, No. 4, 1986, pp. 169–179.

11.

Krumbein

W. C.

Measurement of Geological Significance of Shape and Roundness of Sedimentary Particles. Journal of Sedimentary Petrology, Vol. 11, 1991, pp. 64–72.

12.

Blatt

, Middleton

G. V.

, and Murray

R. C.

Origin of Sedimentary Rocks, Prentice Hall Inc., Englewood Cliffs, N.J., 1972.

13.

Hines

W. W.

, and Montgomery

D. C.

Chapter 10 in Probability and Statistics in Engineering and Management Science, 3rd ed. John Wiley & Sons, Inc., New York, 1990.