Effects of Mixture and Aggregate Type on Over-Compaction in Hot Mix Asphalt in Tennessee

Pawel Polaczyk, Yuetan Ma, Wei Hu, Rui Xiao, Xi Jiang, Baoshan Huang

Research output: Chapter in book / Conference proceedingChapter in an edited book (as author)Academic researchpeer-review

13 Citations (Scopus)


Correct compaction is vital for asphalt mixture service life. An adequately compacted mixture with inferior properties can achieve better performance than a mixture with excellent properties but poorly compacted. This study investigated resistance to damage caused by over-compaction by utilizing the locking point concept. Over-compaction might cause damage to the aggregate structure and decrease service life. The locking point is defined as the moment during mixture compaction at which an aggregate skeleton is developed and becomes stable. Beyond the locking point, more compaction energy does not significantly increase mixture density and can damage aggregate particles. A total of 15 mixtures was utilized and evaluated using the gyratory compactor. Among them, five dense-graded plant mixtures contained different aggregates and binders, and 10 laboratory mixtures (three types: the surface, the base, and stone mastic asphalt [SMA]) were designed with the most popular coarse aggregates in Tennessee: hard limestone, soft limestone, gravel, and granite. The results of this study show that the highest locking point was reached by the mixtures containing gravel. The SMA mixtures have, on average, lower locking points than the dense-graded mixtures. Most of the dense-graded mixtures made with crushed stones failed in the range of +20 to +30 gyrations, whereas the samples made with gravels failed in the range of +30 to +40 gyrations, indicating that gravel seems to be the most resistant to damage.

Original languageEnglish
Title of host publicationTransportation Research Record
PublisherSAGE Publications Ltd
Number of pages13
Publication statusPublished - Apr 2022
Externally publishedYes

Publication series

NameTransportation Research Record
ISSN (Print)0361-1981
ISSN (Electronic)2169-4052


  • asphalt mixture evaluation and performance
  • asphalt mixture performance tests
  • infrastructure
  • materials

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Mechanical Engineering


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