0-6742 : evaluation of design and construction issues of thin HMA overlays.
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2014-08-01
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Abstract:Thin hot-mix asphalt (HMA) overlays, placed
between 1.25 to 0.5 inches, have quickly become
a go-to maintenance treatment in Texas. While
implementation around the state is proving
successful, a few issues needed to be addressed:
1. The unavailability of surface aggregate
class (SAC) A aggregate is pressuring
districts to blend in lower-quality SAC B
materials. The question: How much and
which types of SAC B aggregate should be
allowed in blending to still have
acceptable skid resistance?
2. Because these mixes are so thin, they are
subject to higher stresses than traditional
overlays, especially if the bond is poor.
The question: How do we test bond
strength, and what are the best materials
and methods to achieve a good bond?
3. Achieving adequate compaction is a
critical step to ensure long-term overlay
performance. Measuring density on thin
overlays, however, is not possible with
traditional methods. The question: What
test methods will best monitor thin lift
density?
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