TM 5-822-10/AFM 88-6, Chap. 6
Figure 2-3. Self-contained heater-planer.
Figure 2-4. Heater with scarifying teeth followed by grader.
and an overlay. Scarification also breaks up the crack pattern and reduces the amount of reflective cracks that will appear
in the overlay. Scarifying the top to 1 inch of the surface allows additional asphalt binder or rejuvenating agent to be
added to the scarified material. This procedure is often used to maintain secondary roads to provide a tight waterproof
surface. In most instances, the scarification process is followed by a bituminous concrete overlay.
f. Quality. The quality of mixes obtained by heating and scarifying existing pavements is difficult to control. The
quality of the scarified and rejuvenated mixture depends on the depth of scarification, time of heating, amount of
rejuvenator added, and amounts of compaction. When no overlay is applied in conjunction with the scarified material, it
is necessary that the heated material be rolled immediately after being heated and scarified to ensure that a satisfactory
2-4
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