United States Department of Transportation
i
Evaluating roadway subsurface drainage practices - phase II : [tech transfer summary].
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2015-04-01
[PDF-1.23 MB]
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Abstract:The presence of subsurface drainage systems (e.g., granular bases or
outlets) is generally believed to be beneficial to the performance of
various pavement types. Well-performing subsurface drainage systems
form an important aspect of pavement design for the Iowa Department
of Transportation (DOT).
Iowa Highway Research Board (IHRB) Project TR-643 provided
extensive insights into Iowa subsurface drainage practices and pavement
subdrain outlet performance. However, that project’s forensic testing
and evaluation were carried out in a drought year and during October
and November of 2012, when relatively little rainfall was recorded.
Based on the findings of IHRB Project TR-643, the Iowa DOT requested
an expanded Phase II study to address several additional research needs,
such as the effects of seasonal variation on subdrain outlet performance,
condition of composite (HMA over JPCP) pavement subdrain outlets,
and the characteristics of tufa formation.
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