United States Department of Transportation
i
Evaluation of cost benefits to the SCDOT with increased RAP-RAS usage : final report.
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2014-12-01
[PDF-13.45 MB]
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Edition:Final report, March 2013 - December 2014
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Abstract:Over 90% of U.S. highways and roads are constructed with hot mix asphalt (HMA) and as this
infrastructure ages, these highways and roads must be maintained and rehabilitated. The 1970s marked
the beginning of the widespread use of reclaimed asphalt pavement (RAP) in asphalt pavements in the
United States. However, in early years, many state Department of Transportations (DOTs) used only a
low percentage of RAP materials in their hot mix asphalt (HMA) mixtures. One major reason for this
was that the mixtures containing high RAP contents could result in increased “blue smoke” emissions
from plants since the RAP materials were fed directly into the path of hot gasses. However, with the
modern design of new plants, this is no longer a major concern. There were three major objectives for
this research project. The first was to analyze the cost benefits to the Department from the past
utilization of RAP, RAS, and RAP/RAS in various mixtures around the state. The second objective was
to develop a proposed pay schedule for aged binder versus virgin binder in the form of a draft
specification. The third was to predict the potential cost savings to SCDOT from the use of the
proposed alternate pay schedule. The researchers mined data from three different databases (Site
Manager, Job-Mix-Formula (JMF) Log, and each individual JMF form per project) in order to generate
the necessary information to complete project objectives.
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