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Characteristics of the Rotary Compactor
2012-08-24
The rotary compactor is regarded as one of the best laboratory methods for compacting asphalt mixture specimens, used to evaluate the compaction characteristics and field performance of test specimens. Compaction is achieved by applying vertical stress via end plates; the mold’s longitudinal axis rotates at a fixed angle relative to the vertical direction, while the upper and lower end plates remain parallel. During compaction, the specimen height is automatically measured, and the test density and void ratio are calculated. The operator can choose to compact the specimen to a specified number of rotations or to a target density or void ratio.
The primary challenge with the rotary compactor is how to improve both the quality of compaction and ease of use. The compaction mold, when filled with the mixture, is heavy and often extremely hot. In most cases, these molds need to be loaded into and unloaded from the compactor manually. However, with the new system, there’s no need for manual handling of the filled molds—instead, they automatically descend into the compaction position and then are lifted and transferred to an integrated demolding system, making operation remarkably convenient.
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