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Abstract
Laboratory experiments should simulate to a high degree the conditions in the field, especially in term of compaction procedures. Presently available laboratory compaction methods do not seem to be able to produce specimens that can truly represent the mixtures as it exists in the field, especially for Stone Mastic Asphalt (SMA) mixtures. SMA is highly dependent on the method of compaction. As the application of the SMA is rapidly gaining acceptance worldwide, a suitable laboratory compaction method is evidently needed. Turamesin, a laboratory slab roller compactor was developed to enable laboratory compaction of asphalt mixtures in field simulation conditions. This study was carried out in order to establish criteria for slab compaction and identify the potential of the newly developed Turamesin. A total of nine slabs were prepared with different combination of compactive efforts and data were then analyzed to develop correlation and thus to determine the appropriate values of the compactive efforts that resulted in optimum performance of the asphalt mix slab due to 4% air voids. For the asphalt mix slab to be compacted to the desired ultimate compaction of 4% air voids, the compactive efforts of 8.0 kgf/cm2 of applied pressure and 75 numbers of passes of the roller compactor were required. These values of compactive efforts were considered as typical parameters for Turamesin in achieving a target air void of 4% regardless of SMA mixtures.
Highlights
Asphalt mix design is a laboratory simulation that is meant to simulate field manufacturing, construction and performance of pavement to the extent possible
Based upon the test results and analysis, it was found that for a slab to be compacted to the desired ultimate compaction of 4% air voids, the applied pressure of 8.0 kgf/cm2 and 75 numbers of passes are required
The target air voids was selected based on researches and past performance that have shown that a final compacted void content of 4% is ideal for asphalt mixtures
Summary
Asphalt mix design is a laboratory simulation that is meant to simulate field manufacturing, construction and performance of pavement to the extent possible. Compaction is the process by which the volume of air in asphalt mixtures is reduced by using external forces to reorient the constituent aggregates particles into a more closely spaced arrangement, produces a corresponding increase in density [8]. The currently available rolling wheel compaction devices are found to be expensive, bulky in size and not portable. This has caused the researchers to look into a more simplified version of compactor such as gyratory compactor, rolling wheel compactor is intuitively appealing for its obvious similarity to field compaction process [6]
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