Effect of Dust Ratios on the Strength of Aggregates with Low Plasticity Fines

Abdolreza Osouli, Sajjad Salam, Erol Tutumluer, Sheila Beshears, Stefan Flynn

Research output: Contribution to journalConference articlepeer-review


Unbound aggregate pavement base and subbase courses distribute wheel loads to protect subgrade. Appropriate selection of aggregate material is essential to ensure a stable and long lasting pavement. Both aggregate compaction and strength are influenced by the amount and nature of finer materials controlling the gradations of base and subbase. Current standards such as AASHTO and ASTM have suggested control limits on quantity and plasticity of fine contents. Proportion of percent passing No. 200 sieve to percent passing No. 40 sieve is called dust ratio, which defines the quantity of small sizes in a sample. However, many states either waived some of the AASHTO or ASTM criteria on fine contents or developed their own specific control measures for quantity and quality of fines in aggregates. This study has the objective to identify appropriate quantity control measures for inclusion of plastic fines, i.e., plasticity index of approximately 5%, in crushed limestone aggregates in Illinois. The results of standard Proctor type compaction and soaked CBR tests performed on samples after four days of soaking were used to identify the effects of the different dust ratios and percent fines contents on dry unit weight and aggregate strength.

Original languageEnglish (US)
Pages (from-to)253-265
Number of pages13
JournalGeotechnical Special Publication
Issue number272 GSP
StatePublished - 2016
Event4th Geo-Chicago Conference: Sustainable Materials and Resource Conservation, Geo-Chicago 2016 - Chicago, United States
Duration: Aug 14 2016Aug 18 2016

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Architecture
  • Building and Construction
  • Geotechnical Engineering and Engineering Geology


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