LTPP Data Analysis: Influence of Design and Construction Features on the Response and Performance of New Flexible and Rigid Pavements (2005) / Chapter Skim
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Pages 387-400
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From page 387... ...
376 CHAPTER 7 - ANALYSIS RESULTS FOR THE SPS-8 EXPERIMENT 7.1 INTRODUCTION The purpose of this chapter is to provide a summary of the results of the analyses conducted for the SPS-8 experiment on flexible and rigid pavements. The performance measures used in the analysis include fatigue cracking, rutting, longitudinal cracking (in the wheel path and outside the wheel path)
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377 7.2.1 Site-Level Analysis The analysis of the data from SPS-8 sections was done based on the concepts of PI and relative performance concepts (see Chapter 4) as in SPS-1 experiment.
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378 (frost susceptible or expansive) soils and pavements with thin [102 mm (4-inch)
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379 have shown less transverse cracking than those with "thin" [102 mm (4-inch)
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380 7.2.3 Comparison between Similar Designs of SPS-8 and SPS-1 Experiments To investigate the effect of traffic loading, similar designs in SPS-8 and SPS-1 experiments can be compared for various performance measures. This comparison may help in identifying load-related and environment-related distresses.
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381 0 5 10 15 20 25 30 35 40 WF WNF DF DNF A C F Thin Thick Experimental Factors A v g . f a t i g u e c r a c k i n g , s q m Figure 7-1 Average fatigue cracking by experimental factors -- SPS-8 flexible pavements 0 10 20 30 40 50 60 70 F C Subgrade Type A v g .
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382 0 50 100 150 200 250 300 WF WNF DF DNF A C F Thin Thick Experimental Factors A v e r a g e L C N W P ( m ) Figure 7-5 Average LC-NWP by experimental factors -- SPS-8 flexible pavements 0 50 100 150 200 250 300 F C Subgrade Type A v e r a g e L C N W P ( m )
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383 0.0 0.5 1.0 1.5 2.0 WF WNF DF DNF A C F Thin Thick Experimental Factors A v e r a g e I R I , m / k m Figure 7-9 Average roughness by experimental factors -- SPS-8 flexible pavements 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 F C Subgrade Type A v e r a g e I R I ( m / k m ) Non-Active Active Figure 7-10 Average roughness by subgrade type -- SPS-8 flexible pavements 0.0 1.0 2.0 3.0 4.0 5.0 6.0 WF WNF DF DNF A C F Thin Thick Experimental Factors A v e r a g e R u t d e p t h , m m Figure 7-11 Average rut depth by experimental factors -- SPS-8 flexible pavements 0.0 1.0 2.0 3.0 4.0 5.0 6.0 F C Subgrade Type A v e r a g e R u t d e p t h ( m m )
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384 7.3.2 Overall Analysis The overall initial trends which show the effect of SPS-8 experimental factors on various performance measures will be discussed in this section. These comparisons were carried out only for those performance measures that were exhibited to some extent in the rigid pavements sections.
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385 pavements built on coarse-grained soils, those built on active soils have exhibited higher faulting than those built on non-active subgrades (see Figure 7-18)
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386 0 2 4 6 8 10 12 14 16 WF WNF DF A C F Thin Thick Experimental Factors A v g . t r a n s v e r s e c r a c k i n g , m Figure 7-13 Average transverse cracking by experimental factors -- SPS-8 rigid pavements 0 1 2 3 4 5 6 7 8 9 10 F C Subgrade Type A v g .
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387 0 1 2 3 4 5 6 7 8 9 10 WF WNF DF A C F Thin Thick Experimental Factors A v g . % o f J o i n t s w i t h f a u l t > 1 m m Figure 7-17 Average no.
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388 7.4 SUMMARY OF RESULTS The SPS-8 experiment is entitled Strategic Study of Environmental Effects in Absence of Heavy Loads for Flexible and Rigid Pavements. The study examines the effect of climate and subgrade type (active, fine, and coarse)
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389 7.4.2 Effect of SPS-8 Experimental Factors on Performance of Rigid Pavements Currently a total of 14 rigid pavement sections, in 5 sites, are present in the experiment. There are 8, 4 and 2 pavement sections in WF, WNF, and DF climatic zones, respectively.
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