Influence of Superpave Gradation with Modified Compaction on Bituminous Mixes
Over 90% of the paved highways in India were constructed with many design mixes, such as Semi Dense Bituminous Concrete (SDBC), Dense Bituminous Macadam (DBM) and Bituminous Concrete. Among these mixes a common method is used for flexible pavement design is Marshall Method. With the rapid growth of traffic, the present pavement structure should be designed to withstand the traffic load under various climatic conditions. Under this circumstance, a new method is introduced to fulfill the needs is Superpave (Superior Performing Asphalt Pavements). The Strategic Highway Research Program (SHRP) is developed this method to counteract the effect of traffic load in different climatic condition in the field. Among five types of Superpave design, the 12.5mm sieve is chosen for the design mix; hence it is used for surface course. This paper investigates the effect of shape of aggregate by using Superpave gradation in bituminous mixes. All the specimens were prepared under three type of mix namely Bituminous Concrete (BC), Superpave and Superpave with Modified compactor. For the prepared compacted samples results were evaluated with volumetric analysis, such as Stability, Air voids, Unit weight, Voids in filled aggregates (VFA), and Voids in Filled Bitumen (VFB) and OBC for design mix. Among the results it shows Superpave graded with modified compaction (Hugo Hammer) gives high Stability value compared to other mixes, and also it satisfy all the requirements under MoRTH Specification.
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