Years to first rehabilitation of superpave hot mix asphalt.
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2014-07-01
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Abstract:The Colorado Department of Transportation (CDOT) spends more than 30 percent of its annual construction and
maintenance budget on pavements, so pavements need to be properly designed using an analytical process with
accurate design inputs. A pavement design needs to be performed during the early phase of project development to
estimate and establish the project cost. The performance life of the initial pavement design and associated
rehabilitations greatly impact the life cycle cost analysis (LCCA) used to determine the most cost-effective final
pavement design. Currently, due to lack of actual data, an assumption of the expected life of an asphalt pavement is
often being made. Thus, a precise initial pavement life span is essential for developing a reliable forecasting model
and an accurate LCCA.
This study evaluated the performance of four roadway functional classes utilized by CDOT: interstates, principal
arterials, minor arterials, and major collectors. Performance was evaluated with respect to smoothness, permanent
deformation, fatigue cracking, transverse cracking, and longitudinal cracking.
Implementation
The purpose of this study was to quantify the initial design life of a roadway’s pavement prior to rehabilitation and
provide specific performance information through the analysis of pavement management data and historical
experience. The analyzed data may be used to estimate the initial life of a pavement which can be incorporated into
the LCCA within CDOT’s M-E Pavement Design Guide. It will also provide guidance to CDOT and subcontractors
in determining the cost-effectiveness of different pavement designs, construction and maintenance costs.
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