Effect Of Marble Chips Fillers On Hot Mix Asphalt Performance

Hot Asphalt Mixtures (HMA) is particulate composite material consisting of mineralrnaggregates, asphalt binder and air voids. Asphalt binder is considered as the mostrnexpensive and economically variable material. In road construction, different kindsrnof alternative materials are used for different purpose. Among them the veryrncommon are crushed concrete, crushed glass fines, rubber modifiers, plasticrnmodifiers and different type of fillers. These materials have their own drawbacksrnsuch as high cost, availability (recycled by their own sector) and ease for use.rnThe use of locally available materials in road construction is a key part in roadrnconstruction. Hot Mix Asphalt is composed of Aggregates, Bitumen and Fillers. ForrnHot Mix Asphalt (HMA), fillers play a crucial role in the mix strength. This studyrnevaluates the effects locally available filler, Marble Chips, have on HMA as comparedrnto the conventional crushed fillers. The Marble Chips are used separately and blendedrnwith crushed filler at different percentages (0, 4, 5.5 and 7.5 percent). The study willrnmake use of Marshall Method of mix design to evaluate the volumetric properties asrnwell as film thickness and try to determine the moisture susceptibility of the mix.rnThe research concludes that all mixes prepared satisfy all the criteria of the MarshallrnMix design requirements set in ERA 2013 PDM except for a marginally lower Stabilityrnvalues. An optimum Marble chips content of 4 – 5.5% was also determined. Therneconomic analysis also showed an 8 – 10 percent birr/m2 saving in the production ofrnAsphalt concrete.rnKey Words: Hot Mix Asphalt Performance, Marble Chips Filler, Filler, Film Thickness,rnMoisture Susceptibility, Marshall Mix Design, Economic Analysis

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