Performance Evaluation of Reclaimed Asphalt Pavement (RAP) as a Dense Graded Aggregate Base Course (DGABC) PDF Download
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Author: Frank Palise
Publisher:
ISBN:
Category : Pavements, Asphalt
Languages : en
Pages :
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Author: Frank Palise
Publisher:
ISBN:
Category : Pavements, Asphalt
Languages : en
Pages :
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Author: Robert Fredwin Baker
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 64
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Author: Mengqi Wu
Publisher:
ISBN:
Category : Asphalt
Languages : en
Pages : 145
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Author: Burak F. Tanyu
Publisher:
ISBN:
Category : Pavements, Asphalt concrete
Languages : en
Pages : 0
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This report is written to summarize the findings of a study conducted by George Mason University's (GMU) Sustainable Geo Infrastructure (SGI) Research group to evaluate the expansion of using reclaimed asphalt pavement (RAP) and to optimize the RAP content in unbound base aggregate. The particular scope of the research presented in this report has been determined by the VTRC/VDOT team and included a laboratory and a field study. Prior to the initiation of the research, based on the conversations with Virginia's road building industry it was determined that the research will focus on evaluating what is referred as "fine processed" RAP (100% of the particles finer than 1-inch). Virgin aggregate (VA) used in this study complied with the VDOT's 21A gradation and contained geologically similar aggregate pieces (diabase). During the initial phase, based on the availability, samples of RAP from 14 different asphalt plants in Virginia were collected and characterized. The goal was to assess the similarities and differences between the RAP produced throughout the Commonwealth. The results showed that all RAP samples had similar grain size distribution and primarily contained pieces of aggregate that were of diabase origin. The binder (asphalt) content of the samples ranged from 4.4 to 6.1%. Based on this characterization, samples from three different plants that represented a low, medium, and high binder content RAP were selected for detailed evaluation. The ages of the collected RAP samples were not known and most likely varied. Laboratory evaluation focused on assessing the performance of the RAP-VA blends against the performance of the 100% VA alone. CBR, resilient modulus (Mr), and permanent deformation (PD) tests were used to evaluate performance. Up to 60% RAP (with three different binder contents) was blended with VA by weight. Results from PD tests showed a threshold where some addition of RAP into VA improved the performance but beyond a specific threshold, the overall performance started to decline. This threshold was determined to be a function of both the percentage of RAP added to a blend and the percentage of the binder content of the 100% RAP used. The optimized maximum RAP percentage in a given blend was determined in this study as up to 20% for RAP with low binder content (i.e., d"4.6%) and up 30% for RAP with high binder content (i.e., e"5.6 %). The reasons why RAP with different binder content resulted in different percent threshold requires further investigation as it could be due to the differences in the age of the RAP, which was not part of the scope of this study. Field evaluation part of the study involved in constructing an actual roadway with four different base course layers consisting of 20 and 30% RAP-VA blends with low (4.5%) and high (5.7%) binder contents. Sections constructed with VA alone were used as a comparison (control sections). Field study demonstrated that Light Weight Deflectometer and modified speedy moisture content tests are suitable tools to be used for quality control of RAP-VA blends during construction. Performance evaluation in the field was monitored for a year with the embedded instruments and nondestructive tests conducted during and after the construction. Results obtained from the field were in agreement with the laboratory observations. Based on the findings from laboratory and supported by the field observations, a relationship between the binder content of the 100% RAP and maximum allowed RAP percentage to create RAP-VA blends is created to provide guidelines for implementation
Author: Mark A. Wasemiller
Publisher: ASTM International
ISBN: 0803124708
Category : Materials
Languages : en
Pages : 339
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Author: N. Gucunski
Publisher:
ISBN:
Category : California bearing ratio
Languages : en
Pages : 12
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Laboratory and field investigations were conducted to evaluate the use of recycled asphalt pavement (RAP) in roadway base and sub-base applications. The laboratory resilient modulus test results showed RAP has comparable strength with dense graded aggregate base and sub-base material used in the State of New Jersey. Using the spectral-analysis-of-the-surface-waves method (SASW), the field testing program evaluated the elastic modulus of the RAP base in the field and verified the laboratory results. The field test results showed higher modulus and stiffness for RAP than the dense graded aggregate base normally used in state of New Jersey.
Author: Lamar Caylor
Publisher:
ISBN:
Category : Pavements
Languages : en
Pages : 54
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Author: Reynaldo Roque
Publisher:
ISBN:
Category : Pavements, Asphalt
Languages : en
Pages : 118
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Author: Shawn Shiangfeng Hung
Publisher:
ISBN: 9781085585194
Category :
Languages : en
Pages :
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The pavement community, including both agencies and industries, is moving toward more sustainable pavement designs and pavement network management. Increasing amounts of recycled materials, both reclaimed asphalt pavement (RAP) and recycled tire rubber, are expected to be used in new pavement construction projects in the future to reduce the use of virgin binder and aggregates. The main concern of using recycled materials in new asphalt pavement is the potential negative effect on the performance. Thus, the primary objective of this dissertation is to improve the current laboratory testing technologies and performance assessment approaches for characterizing the performance-related properties of asphalt mixes containing recycled materials and to improve understanding of how these properties affect the performance of asphalt pavements so that they can be designed and constructed better. A major challenge regarding the use of high RAP content mixes is the differences in the rheological properties of the virgin binder (mixes without RAP) and the blended binder (mixes with RAP). Traditionally, binder blending charts are used to determine the appropriate RAP content in asphalt mixes and the selection of virgin binder grade as part of the Superpave volumetric mix design procedures when RAP is incorporated in the mix. However, producing mixes based on blending charts that require testing of extracted and recovered RAP binders is expensive and hazardous. An alternative test approach for binder blending charts using fine aggregate matrix (FAM) mix testing is presented in this dissertation. The results demonstrated that the proposed approach could estimate the blended binder intermediate and low performance grading temperatures within ±3°C of the measured blended binder performance grading temperatures. Even though the proposed approach is not as accurate as the blending chart method (within ±2°C), it provides both cost and environmental benefits. Currently, the Superpave Performance Grading (PG) system cannot not be used to evaluate the performance-related properties of asphalt rubber binders produced using larger crumb rubber particles (maximum particle size passing 2.36 mm sieve) due to the limitations of parallel plate geometry. With the consideration of more open-graded or gap-graded rubberized hot mix asphalt (RHMA-O and RHMA-G) projects in the future, it is important to be able to perform Superpave PG testing on asphalt rubber binder and to establish performance-based contract acceptance criteria for the production of asphalt rubber binders. The test results indicated that the concentric cylinder geometry is an appropriate alternative geometry to parallel plates for quantifying the properties of asphalt rubber binders and specifically for assessing the high-temperature performance properties of binders containing crumb rubber particles larger than 250 [mu]m. Concerns have been raised with regard to incorporating reclaimed rubberized asphalt pavement (RRAP) into dense-graded new hot mix asphalt (HMA-DG) and RAP into new RHMA-G since the interactions between the virgin binder, age-hardened binder, and recycled tire rubber could considerably affect the rutting, fatigue cracking, and thermal cracking performances of new HMA-DG and RHMA-G. The fundamental differences between RAP and RRAP were identified and the performance of new mixes that contain these recycled materials were evaluated in this study. The experimental results showed that adding RRAP to HMA-DG mixes is ideal to resist rutting and low-temperature cracking based on the changes in mix stiffness. The HMA-DG mixes containing RRAP are better at resisting high tensile strain loadings than mixes containing RAP. In addition, adding RAP to RHMA-G mixes improves the rutting performance but diminishes the cracking performance, and potentially negating the benefits of selecting RHMA-G as an overlay to retard the rate of reflection cracking. Lastly, the effects of rest periods on asphalt fatigue performance considering asphalt thixotropy, non-linearity, self-heating, self-cooling, and steric hardening were also investigated in this research. The experimental test results showed that asphalt thixotropic softening and other biasing effects control the first 10 to 15 percent decrease in stiffness for unmodified binders and 15 to 35 percent decrease in stiffness for modified binders under cyclic loading, and this decrease in stiffness can be recovered with the introduction of rest periods. This means that most of the repeated loadings applied to test specimens within the thixotropic softening range do not caused any fatigue damage but only softening of the materials. Thus, by providing sufficient rest periods within the thixotropic softening range can effectively improve asphalt fatigue performance. Both the thixotropic softening range and the required time for thixotropic recovery (i.e., rest periods) need to be considered in asphalt fatigue test and mechanistic-empirical (ME) design for better evaluation of the true fatigue performance.
Author:
Publisher:
ISBN:
Category : Pavements, Asphalt
Languages : en
Pages : 61
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