Effect of Marble Chips Fillers on Hot Mix Asphalt Performance
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Date
2017-05
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Abstract
Hot Asphalt Mixtures (HMA) is particulate composite material consisting of mineral
aggregates, asphalt binder and air voids. Asphalt binder is considered as the most
expensive and economically variable material. In road construction, different kinds
of alternative materials are used for different purpose. Among them the very
common are crushed concrete, crushed glass fines, rubber modifiers, plastic
modifiers and different type of fillers. These materials have their own drawbacks
such as high cost, availability (recycled by their own sector) and ease for use.
The use of locally available materials in road construction is a key part in road
construction. Hot Mix Asphalt is composed of Aggregates, Bitumen and Fillers. For
Hot Mix Asphalt (HMA), fillers play a crucial role in the mix strength. This study
evaluates the effects locally available filler, Marble Chips, have on HMA as compared
to the conventional crushed fillers. The Marble Chips are used separately and blended
with crushed filler at different percentages (0, 4, 5.5 and 7.5 percent). The study will
make use of Marshall Method of mix design to evaluate the volumetric properties as
well as film thickness and try to determine the moisture susceptibility of the mix.
The research concludes that all mixes prepared satisfy all the criteria of the Marshall
Mix design requirements set in ERA 2013 PDM except for a marginally lower Stability
values. An optimum Marble chips content of 4 – 5.5% was also determined. The
economic analysis also showed an 8 – 10 percent birr/m2 saving in the production of
Asphalt concrete.
Key Words: Hot Mix Asphalt Performance, Marble Chips Filler, Filler, Film Thickness,
Moisture Susceptibility, Marshall Mix Design, Economic Analysis
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Keywords
Hot Mix Asphalt Performance; Marble Chips Filler; Filler;Film Thickness; Moisture Susceptibility, Marshall Mix Design; Economic Analysis