Abstract
The Effect of Using Dust of Crushed Boulders on Hma Properties
Highlights
It has long been recognized that the filler plays a major role in behavior of the asphalt mixtures Fillers fill voids between coarse aggregates in the mixture and alter properties of the binder, because the filler acts as an integral part of the mastic
Mineral Filler The mineral filler (Crushed gravel dust) from same crushed boulders to introduce of crushed gravel that used in hot-mix asphalt (HMA) was used and it was brought from the plant of hot asphalt concrete mix of Makyol – GenkezCompany (Turkish), % passing sieve No.200 was equal to 98% with a specific gravity of 2.85 .The second type of mineral filler was lime stone dust possesses % passing sieve No.200 was equal to 97% with a specific gravity of 2.727
It can be concluded from Table (9) that the percentages of crushed boulder dust mix affects resistance of mixtures to moisture damage resistance, which is defined by index of retained strength results indicate that exist of crushed boulders dust into the mix instead of lime stone dust type causes to increase more than 135% of index of retained strength(moisture damage resistance)
Summary
It has long been recognized that the filler plays a major role in behavior of the asphalt mixtures Fillers fill voids between coarse aggregates in the mixture and alter properties of the binder, because the filler acts as an integral part of the mastic (combination of bitumen, filler, and entrapped air). At some point the smallest particles no longer make contact and, instead, lose contact and become suspended in asphalt binder These suspended particles do not have the particle-particle contact that is created by the larger particles [3] he hypothesized that for dense-graded mixes this loss of particle-particle contact occurred with sizes somewhat less than 75 tm, most likely between 50 and 75 p.m depending on the filler and mixture. He further concluded that mineral filler should be defined as the fraction of the aggregate with particles sufficiently small such that the particles are suspended in the asphalt binder and no longer maintain particle-to-particle contact. In case of sticking todust (mineral filler) formed by repeated crushing gas same texture (this nature cause's strong bond among them).The physical properties of aggregate are shown in Table (3)
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