Abstract
The permanent deformation (rutting) of pavement is a major distress in flexible pavement. It is related to vehicles properties and/or pavement materials and conditions. This article presents an extensive experimental investigation in order to compare between the aggregate gradation according to Superpave and Marshall methods of asphalt concrete mix design on pavement rutting and to examine the sensitivity of rutting resistance to aggregate gradation. A wheel truck machine has been used for measurement of pavement rutting (permanent deformation). The tests were carried out at two controlled different air temperature 55℃ and 25℃. The results obtained showed that the adopting of aggregate gradation procedure of Superpave method of pavement mix design for Marshall method of asphalt concrete mix design can reduce the pavement rutting by about 50%. This achievement may be related to missing of three sieves in aggregate gradation procedure of Marshall method which controls rounded and finer aggregate particles. These sieves provide more continuity for aggregate gradation to ensure filling unnecessary gaps and produce more contact points between the aggregates in Hot Mix Asphalt (HMA). The outputs of the research support modifying Marshall method of asphalt concrete mix design by adopting aggregate gradation proposed in Superpave method. The results of study also showed that the coarser aggregate provided more resistance to pavement rutting.
Highlights
Hot Mix Asphalt (HMA) is one of the most popular types of asphalt pavement design used in different countries around the world
The mix that contained aggregate has a gradation pass through the restricted zone (S-TR) gives lower Marshall stability than the other types of Superpave base aggregate gradation mixes. This region is usually recommended to be removed from Superpave aggregate
Three of these gradations were according to Marshall method as lower limit of specification (M-LL), mid-specification (M-MS), and upper limit of specification (M-UL)
Summary
Hot Mix Asphalt (HMA) is one of the most popular types of asphalt pavement design used in different countries around the world. The Strategic Highway Research Program (SHRP) developed a new mix design method namely Superior Performing Asphalt Pavements (SUPERPAVE). This method consists of three main steps: 1) Performance Grade (PG) of binder which depends on a range of degrees of temperature and adjust according to traffic consideration, 2) criteria for aggregate gradation including more restrictions compared with Marshall method, 3) mix design procedure simulates the field conditions and performance tests, ; it ties the materials selection to traffic and climates considerations [4]-[6]. They showed that the resistance to rutting is highly depending on aggregate gradation
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