Effects of Subsurface Drainage on Pavement Performance: Analysis of the SPS-1 and SPS-2 Field Sections (2007) / Chapter Skim
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Pages 85-90
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From page 85... ...
85 Design of the SPS-1 and SPS-2 Experiments The LTPP Program's SPS-1 and SPS-2 experiments were designed to assess the effects of several factors on the performance of flexible and rigid pavements. These factors include layer thickness, base type, subdrainage, climate, subgrade, and truck traffic level.
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From page 86... ...
86 Soils The natural drainage characteristics of the soils at the SPS-1 and SPS-2 sites were examined by studying county soil reports and the taxonomic classifications of the predominant soil series at the sites. The soils of the SPS-1 and SPS-2 sites range from very well drained (or, in natural drainage class terminology, "somewhat excessively drained" for agricultural purposes)
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From page 87... ...
excessively drained. This suggests that once a pavement structure is constructed, water in a drainable base layer may find that lateral outflow is less restricted than downward flow even though the natural drainage characteristics of the subgrade soil, if exposed, would be conducive to downward flow.
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From page 88... ...
88 more years of service and more than 15 million accumulated ESALs at some sites. It is not too surprising that only a small percentage of joints associated with any of the treatments are exhibiting poor load transfer, considering that the joints in nearly all of the SPS-2 sections are dowelled.
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From page 89... ...
rates of change in IRI over time is concluded to be due predominantly to differences in base stiffness. The potential effect of drainage is not necessarily ruled out, but no particular evidence was detected for the role of drainage, independent of the role of base stiffness, in the development of roughness in the SPS-2 pavements.
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From page 90... ...
90 maintenance technologies. Similarly, it is not that pavement subsurface drainage systems do not work (although sometimes that is the case)
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