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With the recent focus on sustainable construction practices, increased use of nontraditional and recycled aggregate materials has become commonplace. However, information on the use of large 75 – 150-mm top size virgin and recycled aggregates, often referred to as ‘aggregate subgrade,’ is scarce. The use of aggregate subgrade materials as primary crusher runs or crushed concrete aggregate is both economical and quite effective over soft subgrades to be improved for building pavement foundation. To this end, a research study was undertaken at the Illinois Center for Transportation to investigate the rutting performance of aggregate subgrade layers. Twelve full-scale pavement working platforms and an equal number of low volume road test sections were constructed with selected materials and subjected to accelerated pavement testing. This paper focuses on the influence of strength properties affecting field rutting performances of constructed pavement test sections. Strength profiles over the depth of the constructed aggregate layers were tested and evaluated with the use of a variable energy dynamic cone penetration testing and visualization device known as the French Panda. In this way, large aggregate penetrations into soft subgrade could also be successfully monitored. Both laboratory strength properties and as-constructed layer aggregate behavior under repeatedly applied traffic loading were found to influence the field strength profiles and the rutting performances of unbound granular layers.
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