Project Report on the Continued Development and Analysis of the Flexible Pavements Database Page: 27
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The LTPP SPS-3 studies focused on a total of 81 locations comprising 486 sections
throughout the United States. To make the problem manageable and minimize variability,
however, this research analyzed only 13 sections from 4 Texas locations. It can be argued that
the relatively small size of the dataset might drive the results to be statistically inconclusive. The
reason behind restricting the dataset to a small number of sections was the time and computation
effort it would otherwise require to handle a larger dataset. Even the determination of the Level I
calibration coefficients required a minimum of a couple hundred runs on the MEPDG. Once
enough time-series information is available in the TFPD, this exercise should be repeated.
Previous results have indicated that chip seals performed well almost in every climatic
region (Morian et al., 1998). The study suggests aggregates, emulsions, and construction
practices were the keys to success in the case of chip seals. However, at the same time their
performance was affected by moisture-related issues. Thin overlays were successful in
improving ride quality, restraining reflective cracking, and correcting rutting.
6.5 Our Results
The Level 1 bias correction factors as obtained for each of the SPS-5 and SPS-3 test
locations are given in Table 6.2. Looking at the results from the SPS-5 test sites reveals a definite
trend in the data. Test sites that were constructed with RAP mixes have a lower product for the
two bias correction factors under consideration. The product of the two bias correction factors
was considered meaningful because the rut depth at any given point in time is directly
proportional to the bias correction factors. This means a higher value for any of the bias
correction factors or both will translate to a greater rut depth. Thus, their product jointly captures
the influence of both calibration coefficients on the rut depth at any point in time. This trend in
the data can be translated to mean that sections constructed with mixes containing RAP are less
susceptible to rutting. Previous research studies have also suggested that the use of recycled
asphalt mix tends to improve the performance of the asphalt mixtures from a rutting perspective
(Putman et al., 2005). Therefore, the initial trend in the data reinforces the fact that RAP mixes
are relatively more rut resistant than virgin mixes.27
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Banerjee, Ambarish; Aguiar-Moya, José Pablo; Sivaram, Prasad; Smit, Andre de F. & Prozzi, Jorge Alberto. Project Report on the Continued Development and Analysis of the Flexible Pavements Database, report, February 2011; Austin, Texas. (https://texashistory.unt.edu/ark:/67531/metapth281719/m1/41/?rotate=90: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.