Author : Ahmed Mohamed Ahmed Anees
Degree : M.Sc. Civil
Title:
Cold Asphaltic
Mixtures Using Recycled Asphalt Pavement
Abstract:
Recycling of highway construction
materials, such as milled asphalt concrete, makes sound economic,
environmental, and engineering sense. In addition to preserving the
non¬renewable materials and conserving natural resources, it might be a
cost-saving measure by provision funds for additional projects. Cold asphalt
mixtures have many advantages when compared to hot asphaltic mixtures,
including a lower level of harmful emissions, energy saving due to construction
at lower temperatures, modest construction equipment, and a higher level of
safety during construction. Cold recycling of asphalt concrete technology
provides the merits of both cold mix and recycling. However, cold recycling,
and recycling of asphalt concrete in general, is not widely used in Egypt due
to a number of reasons including well documented issues with cold mixes such as
the lack of gaining early strength, the high percentage of air voids in
asphaltic mixture and the lower stability values as compared to hot asphaltic
mixtures.
The main objectives of this project
are to investigate the behavior of cold recycled asphalt mixtures at varying
levels of Asphalt Emulsion Residue Content and varying levels of recycle
materials; to investigate of the effect of curing methods on the stability of
the asphalt mixtures; and to identify the cost effectiveness of using cold
recycled asphalt concrete mixes.
Test results showed that using
recycled pavement material in cold asphalt mixtures gives adequate engineering
properties satisfying the requirements of low to moderate trafficked roads.
However, the results showed the high sensitivity of cold mixtures for water
action. The most important conclusion is that the best time for executing cold
mixtures is the summer and the spring. Moreover, using recycled asphalt
pavement in the cold asphaltic mixtures in a percentage of 40 might result in material
cost savings of up to an estimated 9.
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