Microsurfacing (2010) / Chapter Skim
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Pages 36-41
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From page 36... ...
The tack coat application rates ranged from 0.05 gallon per square yard to 0.25 gal/y2 (0.25 to 1.5 l/m2)
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Scratch coat 3. Rut filling 4.
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depth may require multiple placements with the rut filling spreader box to restore the original cross section" (Labi et al.
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It furnishes a set of guidelines for incorporating rut filling into a typical agency pavement preservation and maintenance program. Figure 21 shows before and after pictures of an appropriate use of microsurfacing for rut filling on Interstate 90 in eastern Washington State.
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Pavement is structurally sound X X X X X X Rutting is due to mechanical compaction of pavement structure X X X Ruts are flat, not sharp or showing dual wheel marks X X X Ruts do not contain fatigue cracking X X X X X X TABLE 28 LITERATURE SUMMARY OF APPROPRIATE CHARACTERISTICS FOR RUT FILLING FIGURE 21 Microsurfacing applied to rutting caused by studded tires in Washington State: before and after (Washington State DOT 2009)
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From page 41... ...
Two types of spreader boxes were discussed in detail, but these are mere appurtenances that are attached to other pieces of construction equipment, and that is the subject of the next chapter. One effective practice was developed: Scratch coat and full lane-width microsurfacing can use the same size aggregate with no apparent difference in performance.
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