Evaluation of a Large Aggregate Asphaltic Layer in an Airside Pavementby P. J. Molenaar, Van Wyk & Louw (Inc) Consulting, Engineers, Pretoria, South Africa,
Abstract: A new analytical method of designing large aggregate asphalt mixes (LAM) was used to design a thick asphalt base layer for an aircraft taxiway. The results of an analysis on the material properties and pavement behaviour are presented. It is proven that the proposed design method, incorporating a modified Hugo hammer compaction method and 150 mm diameter moulds, provides very good simulations of as-built engineering properties. The smoothness of the grading curve is important but not critical and slight deviations in grading can be tolerated. Backcalculations of MDD measurement under aircraft loading has shown effective moduli for LAM which were less than that for laboratory tested core samples. It is shown that the difference in stiffness can purely be attributed to variations in loading frequency and temperature. Theoretical corrections of the backcalculated moduli resulted in equal or better than expected moduli, confirming the suitability of the proposed analytical mix design method for LAM.
Subject Headings: Material properties | Asphalt pavements | Airport and airfield pavements | Pavement design | Construction materials | Load factors | Structural behavior | Aggregates
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