Critical Tensile Strain in Asphalt Pavementsby Yang H. Huang, (M.ASCE), Assoc. Prof. of Civ. Engrg.; Univ. of Kentucky, Lexington, KY,
Serial Information: Transportation Engineering Journal of ASCE, 1973, Vol. 99, Issue 3, Pg. 553-569
Document Type: Journal Paper
Charts based on two-layer elastic theory are presented for determining the critical tensile strain at the bottom of the asphalt-bound layer under single, dual, and dual-tandem wheels. They can be applied directly to full-depth asphalt pavements where only two layers are involved. For a conventional three-layer system, a method is developed to convert it into an equivalent two-layer system, so that the charts can still apply. A comparison of the critical tensile strains obtained from the charts with those determined directly from a computer program clearly indicates that they are accurate enough for engineering applications. Examples are given to illustrate the use of these charts for determining the critical tensile strains in two-layer and three-layer pavement systems. It is found that for a given pavement type and tire configuration there exists a critical thickness of the asphalt-bound layer at which the greatest tensile strain is obtained, and that the critical tensile strains under dual-tandem wheels are generally smaller than that under the dual wheels alone.
Subject Headings: Asphalt pavements | Strain | Ultimate strength | Asphalts | Vehicle-pavement interaction | Elastic analysis | Comparative studies | Computer software
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