| 16. Abstract
The Specific Pavement Studies 6 (SPS-6) experiment,
"Rehabilitation of Jointed Portland Cement Concrete Pavements," was
designed as a controlled field experiment that focuses on the study
of specific rehabilitation design features of jointed plain
concrete pavements (JPCP) and jointed reinforced concrete pavements
(JRCP). This experiment examines the effects of climatic regions
(wet-freeze, wet-no freeze, dry-freeze, or dry-no freeze), type of
concrete pavement (plain or reinforced), condition of existing
pavement prior to rehabilitation (fair or poor), and traffic rate
(as a covariant), incorporating the different methods of
rehabilitation with and without asphalt concrete (AC) overlays.
This report documents the first comprehensive review and evaluation
of the SPS-6 experiment. Fourteen SPS-6 projects have been
constructed. At each site, there are eight core sections plus
various numbers of supplemental sections.
Data availability and completeness for the SPS-6 experiment are
good overall. In general, most of the data are at the releasable
level E status. However, some data, such as traffic, climatic, and
materials data, are not yet available in the Information Management
System (IMS) database. These deficiencies need to be addressed
before a comprehensive analysis of the SPS-6 experiment is
conducted. The required experimental design factors were compared
with the actual constructed values. This includes both the site
condition factors and the pavement design features. Most SPS-6
sections follow the experimental design for the great majority of
the design factors. Three of the 14 sites are still relatively new
and, therefore, do not have much data available at this time. It is
believed that the information has been collected and is in the
process of being entered into the IMS database.
This evaluation has shown that several significant problems
clearly limit the results that can be obtained from the SPS-6
experiment. Specifically, no SPS-6 projects were built in certain
climatic regions. Some SPS-6 sites have construction deviations,
and significant materials data and traffic data are missing from
other sites or sections. However, even though the SPS-6 sections
are relatively young, some interesting and important early trends
have already been identified that will be useful to the
rehabilitation of jointed portland cement concrete (PCC) pavements.
As time and traffic loadings accumulate, much more valuable
performance data will be obtained. It is believed that even more
results can be obtained if a concerted effort is made to obtain
missing data (materials, traffic, climate, and monitoring) and to
perform proper analyses of the data. Specific recommendations for
further analyses are included.
|
17. Key Words
AC overlay, CPR, crack and seal, design factors, experimental
design, JPCP, JRCP, LTPP, performance trends, rehabilitation,
SPS-6. |
18. Distribution Statement
No restrictions. This document is available to the public through
the National Technical Information Service, Springfield, VA
22161. |
