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CASE STUDIES OF THE TENDER ZONE IN COARSE-GRADED SUPERPAVE MIXTURES. DRAFT FINAL REPORT

The objective of this study was to collect information concerning the production and placement of hot mix asphalt (HMA) pavements which had experienced problems with a tender zone during compaction and to determine the causes of these problems. Additionally, the study sought possible solutions to eliminate or reduce the tender zone problems. Both documentation and evaluation through mixture testing are included. Documentation of the mix design, production, transport, and laydown was conducted at each project. Items documented include the job mix formula information, plant information, roadway data, weather conditions, paving equipment, compaction methods, and specific observations pertaining to the tender zone.