Evaluation of Gap-Graded Asphalt Concrete Mixtures Vol. 3. Appendix, HR-157, Volume 3 (Part 3), 1972 (1973)

(1972) Evaluation of Gap-Graded Asphalt Concrete Mixtures Vol. 3. Appendix, HR-157, Volume 3 (Part 3), 1972 (1973). Transportation, Department of


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This report presents the results of a comparative laboratory study between well- and gap-graded aggregates used in asphalt concrete paving mixtures. A total of 424 batches of asphalt concrete mixtures and 3,960 Marshall and Hveem specimens were examined. There is strong evidence from this investigation that, with proper combinations of aggregates and asphalts, both continuous- and gap-graded aggregates can produce mixtures of high density and of qualities meeting current design criteria. There is also reason to believe that the unqualified acceptance of some supposedly desirable, constant, mathematical relationship between adjacent particle sizes of the form such as Fuller's curve p = 100 (d/D)n is not justified. It is recommended that. the aggregate grading limits be relaxed or eliminated and that the acceptance or rejection of an aggregate for use in asphalt pavement be based on individual mixture evaluation. Furthermore, because of the potential attractiveness of gap-graded asphalt concrete in cost, quality, and skid and wear resistance, selected gap-graded mixtures are recommended for further tests both in the laboratory and in the field, especially in regard to ease of compaction and skid and wear resistance.

Item Type: Departmental Report
Note: Conflict between title page and technical report page in terms of the title of this research report and the report date. Both are represented in the the title section above with the report title in parentheses.
Keywords: Aggregates, Asphalt concrete, Density, Design, Evaluation, Gap grading, Laboratory studies, Mathematical analysis, Skid resistance
Subjects: Transportation
Transportation > Materials
Transportation > Materials > Gravel and aggregates
Transportation > Roads and highways
Transportation > Design and Construction
ID Code: 19632
Deposited By: Iowa DOT Library
Deposited On: 01 Jun 2015 15:06
Last Modified: 01 Jun 2015 15:06
URI: https://publications.iowa.gov/id/eprint/19632