United States Department of Transportation
i
Hot mix asphalt research investigation for Connecticut, part D : evaluate the feasibility of using permeability for in-place density dispute resolution on bridge decks.
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2014-07-01
[PDF-3.95 MB]
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Abstract:The presence of water in asphalt pavements is detrimental to the life of the pavement. Most
construction specifications require the pavement to be compacted to a specific air void content. As an asphalt
pavement’s air void content increases, the permeability of that pavement will typically increase. The
relationship between density and permeability indicates that the lower the density the higher the permeability.
Pavement permeability can cause significant issues on bridge decks. For example, if steel reinforcing is
exposed to water and salt permeating through the pavement, oxidation can occur and steel members will begin
to deteriorate rapidly. Therefore, the objective of Part D of the CT HMA study is to determine if measuring the
permeability of a pavement on a bridge deck will work as a non-destructive dispute resolution test for the in-place density of the pavement. The data collected and analyzed for this research indicates there is an
exponential growth in permeability as the percent air voids increase. However, for a permeability based dispute
resolution process to be implemented the field testing method would need to be much more sophisticated than
current methods. The subjective nature of the test has the potential to cause more disputes than it would
resolve
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