Use of Concentration Index for Pavement Design

by Richard G. Ahlvin, (F.ASCE), Supervisory Civ. Engr., Asst. Chf.; Soils and Pavements Lab., U.S. Army Engrs. Wtrwys. Experiment Station, Vicksburg, MI,
Yu Tang Chou, (M.ASCE), Res. Civ. Engr.; Pavement Design Div., Soils and Pavements Lab., U.S. Army Engrs. Wtrwys. Experiment Station, Vicksburg, MI,
Harry H. Ulery, Jr., (M.ASCE), Supervisory Civ. Engr., Chf.; Pavement Design Div., U.S. Army Engrs. Wtrwys. Experiment Station, Vicksburg, MI,


Serial Information: Transportation Engineering Journal of ASCE, 1974, Vol. 100, Issue 1, Pg. 135-149


Document Type: Journal Paper

Abstract: The application of the concentration index to pavements is illustrated. The problem with the design of flexible airfield pavements under newly developed jumbo-jet aircraft, as represented by the Lockheed C-5A Galaxy and the Boeing 747, is examined. These aircraft are equipped with extremely large multiple-wheel landing gears. It is found that the CBR design equation can be used to evaluate the pavement performance under multiple-wheel gear assemblies when the equivalent single-wheel load is computed by the concentration index method. The concentration index is approximately independent of the load, gear configuration, and soil strength but varies with the depth.

Subject Headings: Pavement design | Airport and airfield pavements | Aircraft and spacecraft | Vehicle loads | Concentrated loads | Soil strength | Asphalt pavements

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