Practice and Performance of Cold In-Place Recycling and Cold Central Plant Recycling (2021) / Chapter Skim
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Pages 99-110
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99 Several agencies indicated on the survey that the lack of project selection criteria was a barrier to increased use of cold recycling. The first case example was selected to highlight the Indiana DOT process for identifying the types of projects on which CCPR and CIR processes can provide an alternative to traditional maintenance and rehabilitation practices.
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100 Practice and Performance of Cold In-Place Recycling and Cold Central Plant Recycling Asphalt pavements with less than 10% full-depth patching and no evidence that an underlying PCC pavement needs repair or recycling are good candidates for CIR with an overlay. When the PCC pavement needs remediation, then the existing asphalt pavement needs to be milled off so the underlying structure can be repaired.
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Case Examples 101 Source: Indiana DOT, Chapter 602, Figure 602-1a. Figure 50.
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102 Practice and Performance of Cold In-Place Recycling and Cold Central Plant Recycling which were placed on 12-in.
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Case Examples 103 Mr. Rettner also noted that the density on a typical cold recycled mix project is dependent on the weather throughout the day of construction.
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104 Practice and Performance of Cold In-Place Recycling and Cold Central Plant Recycling RAP with more consistent gradations. The finer gradation also produces mixes that are less prone to segregation.
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Case Examples 105 The new standard includes four innovative components: • Adjusting the RAP gradation based on achievable density over a range of temperatures • Setting an optimum moisture content to prevent flash setting of the emulsion • Field testing in nearby field laboratories with quick turnaround times • Shear vane testing to determine when the roadway can be opened to traffic Discussions with Mr. Kevin VanFrank were used to clarify, expand, and summarize these points in the following sections (K.
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106 Practice and Performance of Cold In-Place Recycling and Cold Central Plant Recycling When the percent compaction at 80°F (27°C) is less than 92% (± 1%)
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Case Examples 107 The equipment consists of a 5-lb sledgehammer, a torque wrench capable of reading to at least 150 ft-lb, a segmented vane [approximately 3 in.
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108 Practice and Performance of Cold In-Place Recycling and Cold Central Plant Recycling MRI Range Segments Existing MRI Average CIR MRI Average Percent Improvement ≤60 34 53.7 76.6 −42.6% 61 to 70 35 65.7 83.8 −27.5% 71 to 80 44 76.4 89.3 −16.9% 81 to 90 56 86.6 84.0 3.0% 91 to 100 34 96.2 85.8 10.8% 101 to 120 54 110.9 88.7 20.0% 121 to 140 23 130.7 89.4 31.6% 141 to 180 77 164.0 90.4 44.9% 181 to 240 166 211.6 86.4 59.2% 241 to 300 85 268.1 88.5 67.0% 301 to 400 84 342.5 89.4 73.9% ≥401 28 441.0 89.4 79.7% Total 720 Source: King and Matthews 2019. Table 63.
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Case Examples 109 Badwater Road in Death Valley, and after 11 years, the pavement condition rating was 95.8. In 1988, the FLH constructed the first CIR project in California on Ice House Road in the Eldorado National Forest.
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110 Practice and Performance of Cold In-Place Recycling and Cold Central Plant Recycling be completed the next day, and then the surface can be fog sealed. In humid climates, secondary compaction may need to wait for several days until the CIR layer cures sufficiently.
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