TM 5-822-10/AFM 88-6, Chap. 6
c. Stockpiling. Prior to production of recycled asphalt concrete, the stockpile of reclaimed materials should be
inspected to ensure that no significant segregation of material exists. Many pavements have been patched during their lives
causing variation in the type of materials at various locations in the pavements. Therefore, the materials should be
removed from the pavement and stockpiled in such a way to ensure proper mixing of these localized materials with the
other reclaimed materials. When the asphalt pavement is removed in two lifts, the properties of the material in the top lift
will probably vary from the properties of the materials in the bottom lift. In this case, the materials should be stockpiled
separately, or some acceptable procedure for blending these materials must be used.
d. Cold feeds. In order to remove all material larger than 2 inches a screen should be placed over the bin or cold
feeder from which the reclaimed materials will be fed to the plant. when conglomerations of asphalt and aggregate exceed
this size, they will not break down enough in the asphalt plant to produce a homogeneous mixture. Consequently, these
oversize pieces may cause problems with pulling and tearing of the mat during the lay- down operation.
e. Control testing. During production of recycled asphalt concrete, a number of tests must be conducted to ensure
that a satisfactory product is produced. The tests used to evaluate recycled mixtures are the same tests used to evaluate
conventional hot mix. These tests evaluate material properties such as, Marshall stability, flow, laboratory density, voids
in the total mixture, voids filled with asphalt, aggregate gradation, asphalt content, temperature, and field density.
Penetration of the recovered asphalt cement is another property that is needed to evaluate recycled mixtures during
production.
4-8.
Laydown of recycled hot mix.
There should be no difference between the laydown of recycled hot mix and the laydown of conventional hot mix. The
recycled mixture may appear to be a little more oily, which is probably due to recycling agent, but this condition is normal.
4-9.
Excess reclaimed asphalt pavement.
All excess reclaimed asphalt pavement should be stockpiled for use on other Government projects. If the ownership
of excess reclaimed asphalt pavement is transferred to the contractor, credit should be given to the Government for its
value.
4-6
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