Synthesis of design and construction practices
COSTS AND BENEFITS ASSESSMENT
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| COSTS AND BENEFITS ASSESSMENT
As shown in the economic analysis section of this report, the use of composite pavement structures can provide a cost-effective alternative for the construction of high-traffic volume corridors throughout the state. Composite pavement systems mitigate various structural and functional problems that typical flexible or rigid pavements tend to present, such as HMA fatigue, subgrade rutting, PCC erosion, and PCC loss of friction, among others. However, they are also more prompt to develop other types of distresses, such as reflective cracking and HMA rutting.
A life cycle cost analysis considering agency cost showed that composite pavement with CTB can be a cost effective alternative to the typical flexible and rigid pavement systems. The composite pavement systems with CTB require thinner HMA layer than equivalent traditional flexible pavements, which reduces the initial construction costs.
Furthermore the sensitivity analysis of the agency costs over the life-cycle of the pavements, suggest that the CRCP base composite pavements can become a cost-effective alternative for very high-traffic high-priority highways (carrying more than approximately 140 million ESALs). However, this analysis was based on an assumed maintenance schedule determined in accordance with the recommendation of the literature reviewed
In addition to the agency savings, road user cost saving could also be important, specially for the HMA over CRCP composite pavement option because it would not require any lengthy rehabilitation actions, as is the case for the typical flexible and rigid pavements.
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