Document Type


Date of Award


Degree Name

Master of Science in Civil Engineering - (M.S.)


Civil and Environmental Engineering

First Advisor

Jay N. Meegoda

Second Advisor

Dorairaja Raghu


There are many factors which affect the properties of asphalt concrete and one of these is a maximum aggregate size used in the mix. In this study of the effect of maximum aggregate size on Marshall stability, flow and durability of asphalt aggregate mixtures is investigated.

Two different mixes having gradations with maximum aggregate sizes of 3/4 and 1-1/2 inches were considered. The optimum asphalt content for mix having 3/4 inch maximum aggregate size, was determined by the standard Marshall procedure. The optimum asphalt content for the mix having 1-1/2 inch maximum aggregate size, was estimated based on thickness of asphalt film, by assuming that the two mixes have same film thickness.

The mixes were tested to evaluate Marshall stability, flow and durability. Specimens for mix design and evaluation of mixture properties, for mix having 3/4" maximum aggregate size were compacted in 4-inch and 6-inch diameter molds. Whereas the specimens for the mix having 1-1/2 inch maximum aggregate size, were compacted in a 6-inch mold. The 4-inch and 6-inch samples were compacted with 50 and 75 blows to a side, respectively.

Test results showed that the mix with larger aggregate was stronger and durable than mix prepared with smaller aggregate. The mix with larger aggregate also required significantly less asphalt content.



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