Evaluating the Effects of Recycling Agents on Asphalt Mixtures with High RAS and RAP Binder Ratios (2020) / Chapter Skim
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71 Chapter 3 presents field performance of the mixtures included in the field projects and corresponding laboratory performance. Kaseer et al.
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72 Evaluating the Effects of Recycling Agents on Asphalt Mixtures with High RAS and RAP Binder Ratios Distress Type Distresses Quantity and Severity per Test Section Virgin DOT Control (0.28 RBR) +0.5% WMA Rejuvenated (0.28 RBR)
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Field and Laboratory Performance of High RBR Mixtures 73 because these mixtures were very brittle and did not have post-peak displacement data available to allow determination of the inflection point, and thus FI approaches zero. Figure 39, Figure 40, Figure 41, Figure 42, and Figure 43 demonstrate that all the recycled mixtures with high RBR and with the field dose of recycling agent exhibited lower FI values compared to the virgin and/or DOT control mixtures, indicating that using recycling agents at the low field doses did not adequately improve the cracking resistance of the recycled mixtures.
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74 Evaluating the Effects of Recycling Agents on Asphalt Mixtures with High RAS and RAP Binder Ratios Figure 41. FI results of IN field cores.
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Field and Laboratory Performance of High RBR Mixtures 75 Figure 43. FI results of DE field cores.
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76 Evaluating the Effects of Recycling Agents on Asphalt Mixtures with High RAS and RAP Binder Ratios 3.3 Comparison of Laboratory Results and Field Performance In order to evaluate the recycling-agent dose selection method developed in this study and facilitate proposing materials selection guidelines, the performance of field-test sections and UTSST and I-FIT results for corresponding laboratory-compacted LMLC and RPMLC specimens was compared in an effort to establish thresholds for determining acceptable mixture performance in terms of both low- and intermediate-temperature cracking resistance. Previous observations of a low-temperature cracking resistance index similar to CRIEnv indicated substantial correlation with field performance, particularly longitudinal and transverse cracking distresses, with details provided in Hajj et al.
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Section ID Mix ID In-Service Age for Distress Data (Years) Crack Density (1/m)
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78 Evaluating the Effects of Recycling Agents on Asphalt Mixtures with High RAS and RAP Binder Ratios asphalt mixtures with recycling agents were directly compared to the DOT control mixtures in this study. Using DOT control mixtures as reference mixtures for determining acceptable mixture performance in terms of cracking resistance is an alternative if mixture thresholds are not available since these mixtures showed adequate field performance and similar performance to the virgin mixtures.
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