Composite Pavement Systems, Volume 2: PCC/PCC Composite Pavements (2013) / Chapter Skim
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Pages 82-95
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From page 82... ...
82 Note on Versions of the MEPDG MEPDG version 1.014:9030A (03/11/2009) was the first build of MEPDG tailored to the R21 project.
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83 reliability levels. For example, interstate, freeways, and divided highways warrant 95% to 99% and other highways and urban collectors/arterials warrant 90% to 94%.
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84 cost effectiveness. No attempts should be made to reduce the friction between the slab and the base.
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85 MEPDG Design Comparisons The following subsections describe the development of composite PCC/PCC projects in MEPDG (v.
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86 For this level of reliability, the MEPDG suggests a minimum of 8.75-in. JPCP thickness to function as an equally performing single-layer alternative to the PCC/PCC.
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87 Sensitivity Analysis Influence of Upper-lift PCC Flexural Strength in PCC/PCC Performance The upper-lift PCC flexural strength was varied to determine what effect it would have on performance of the PCC/ PCC composite pavement. The only parameter changed was the flexural strength and corresponding moduli of elasticity because these are inherently related PCC properties.
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From page 88... ...
88 For doweled pavements, reductions in the modulus of elasticity for either PCC layer result in a relatively minor improvement in overall faulting, so the performance in faulting predicted by MEPDG met expectations. This trial is one of many reasons the JPCP faulting model was not modified because the existing model appears to capture composite slab faulting behavior adequately.
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89 ice. The noise level is relatively low for the diamond grind (and next-generation grind is even lower, as demonstrated at MnROAD)
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90 becomes essentially a long-life pavement with rapid surface renewal at intermediate times. One PCC/JPC composite pavement located on US-45 in Florida was constructed in 1978 and received no surface rehabilitations (grinding or overlay)
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91 Step 3 Compute Life-Cycle Cost Analysis The FHWA's RealCost EXCEL spreadsheet software is convenient and efficient for entering all of the above costs and properly computing an NPV cost estimate for a composite pavement. RealCost also will compute highway user's cost for project conditions.
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From page 92... ...
92 • Experimental features: Building a PCC/PCC composite pavement with distinct experimental features and sustainability benefits is a good way to get one built in a state or local highway agency. • Future needs: A PCC/PCC can be designed to have a very long structural life with only the retexturing of the thin surface every 20 years (or longer)
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93 paving were scheduled. The pavement was 27 ft wide, with a thickness of 9 in.
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94 Fig ure 4.3, respectively. As evident in these figures, the performances of these structurally equivalent pavements are nearly identical.
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95 0 0.02 0.04 0.06 0.08 0.1 0.12 0 5 10 15 20 Fa ul ti ng (i n) Pavement Age (yr)
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