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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1 EXECUTIVE SUMMARY This report for the project "LTPP Data Analysis: Influence of Design and Construction Features on the Response and Performance of New Flexible and Rigid Pavements" [NCHRP 2050 (10/16)
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2 Although most of the findings support the existing understanding of pavement performance, the results from this study provide a systematic outline of the interactions between design and site factors, as well as new insights on various design options. In addition, the analysis methodology outlined in this research will be useful for future data analysis.
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3 drainage. For drained pavements built on fine-grained soils, those with 8-inch (203 mm)
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4 • Among pavements built on fine-grained soils, a marginal positive effect of drainage is seen in sections with ATB. • Among drained pavements located in WF zone, those with DGAB have shown more rutting than those with ATB.
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5 effective in preventing an increase in roughness for sections with DGAB, especially among those located in WF zone. • For un-drained pavements built on coarse-grained soils, an increase in base thickness from 8inch (203 mm)
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6 longitudinal cracking-WP) can be achieved by providing drainage.
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7 "good" performance. Thus the results presented in this report at this point are an indication of initial trends at best.
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8 occurrence of longitudinal cracking while those with LCB have the highest occurrence of cracking. The effects of the experimental factors are summarized below: • The occurrence of longitudinal cracking among pavements with 8-inch (203 mm)
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9 • Among pavements constructed with standard lane width [12' (3.7 m) wide lane]
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10 Pavements located in "wet" climate, on average, have higher change in IRI than those in "dry" climate. Furthermore, pavements located in WF zone and those built on active soils have the higher changes in IRI.
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