Naoya MIZUSHIMA

Study on the aggregate gradation design of the Bailey method for Superpave asphalt mixtures

Osamu TAKAHASHI

Aggregate gradation greatly the volumetric properties and performance of the asphalt mixture. There are no specific guidelines on aggregate gradation design to ensure the mixture obtains the volumetric requirements and satisfactory performance. This study applies the Bailey method in Superpave mixture design for Tokyo international airport (HND) pavement. The Bailey method is an aggregate gradation design and evaluation process developed in United States. The coarse aggregate (CA) ratio, fine aggregate ratio of the coarse portion (FAc) ratio and fine aggregate ratio of the fine portion (FAf) ratio to design the aggregate interlock and analyze the packing of the combine aggregates for a gradation.
The objective of the study is to obtain the fundamental information on the effects of Bailey parameters on Superpave requirements and mixture performance for Japanese airfields. 22 blends were designed within the Superpave control points and recommended limits of Bailey ratios, based on the same resources of materials from HND pavement. The CALUW ranged from 60% to 105%. The Superpave compaction effort (Ndes) was 105. The rutting resistance and fatigue cracking resistance tests were carried out to evaluate the performance of the mixtures. The test results showed that the mixture with CALUW 90% had adequate VMA and produced good rutting and fatigue performance. The recommended limits of Bailey ratios are required to adjust to a narrow range in order to meet the Superpave requirements.

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