HIGH STABILITY DENSE ASPHALT MIXTURE WITH REDUCED MAXIMUM SIZE AGGREGATE

Mohamed S. Serag, Ahmed Mohamady Abd Allah, Walid H. El-kamash, Mai M. Shams

Abstract


Aggregate is a major component of asphalt mixes, so their properties play a significant role in the mix performance. An aggregate grading that yields maximum solid density and maximum particle interlock is highly desirable for the asphalt concrete mixes. Maximum particle interlock leads to high mix density and stability. Whereas minimum voids in a certain material composition leads to high strength. This paper studied the effects of maximum aggregate relative sizes on the characteristics of asphalt concrete mixtures and the potential of reaching a comparative asphalt mix with low maximum sizes in the order of 1 inch and less. To achieve this objective, different aggregate gradations were used with different maximum aggregate size (MAS) (1, 3/4, 1/2 and 3/8 inch) by using Fuller and Thompson’s Equation (Interactive Equation) which used to describe a maximum density gradation for a required maximum aggregate size to design and prepare the investigated asphalt mixes. Marshall test, loss of stability test, indirect tensile strength test, creep test were conducted to measure these characteristics for all mixes. The analytical analysis of the results indicated that the aggregate gradations with low maximum size aggregate achieve higher stability values against that of the common high maximum size gradations, and enhancing the performance of asphalt mixtures in particular crack resistance.


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