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The objective of this study was to determine the fundamental resilient moduli (Mr) parameters of four asphalt-rubber gap-graded (AR-gap), one asphalt-rubber open-graded (AR-open), four polymer-modified gap-graded (P-gap), and two conventional dense-graded asphalt concrete (DGAC) mixes at various temperatures and frequencies using ASTM D7369-11-based standard resilient modulus test [Standard Test Method for Determining the Resilient Modulus of Bituminous Mixtures by Indirect Tension Test, ASTM International, West Conshohocken, PA, 2011, www.astm.org]. Mr tests were conducted at 15°C, 25°C, and 35°C and at 0.5, 1, 1.5, and 2 Hz on a total of 33 samples with three samples per mix. DGAC mixes had the highest Mr followed by P-gap and AR-gap, and then followed by the AR-open mixes. Mr master curves were constructed for the mixes with 25°C as a reference. Furthermore, the Mr model was developed based on the material properties of 11 mixes totaling 121 data points provided by R2adj = 0.9436 (adjusted coefficient of estimation), and Se/Sy = 0.1579 (ratio of standard error to standard deviation indicative of relative accuracy of the predictive model), depicting excellent correlation between the measured and predicted Mr. Fatigue lives of each mix type was predicted using the obtained Mr and estimated tensile strains. The fatigue lives of the modified gap-graded mixes were found to be seven times higher than the conventional mixes. A novel approach was also devised to obtain fatigue lives of conventional and modified mixtures with a reduced thickness design concept based criterion with Mr being the major input parameter. Overall, it is envisioned that the Mr parameters obtained in this study will be helpful to understand the performance characteristics of the different mixes through future laboratory-field correlations.
This research study aimed to determine the dynamic modulus, bending stiffness and fatigue properties of four representative Superpave Hot Mix Asphalt (HMA) mixtures used in the construction of base layers of Kansas flexible pavements and to compare the measured values with those predicted by the National Cooperative Highway Research Program (NCHRP) Design Guide. To achieve these objectives, asphalt concrete beams were tested in third point-bending at constant strain, at four temperatures and four levels of strain. Dynamic resilient modulus tests were performed on asphalt cylindrical specimens at five temperatures and five loading frequencies. Multi-linear regression analysis was performed to develop a linear relationship between the bending stiffness and the fatigue life for the asphalt mixes tested.
At head of title: National Cooperative Highway Research Program.
Design related project level pavement management - Economic evaluation of alternative pavement design strategies - Reliability / - Pavement design procedures for new construction or reconstruction : Design requirements - Highway pavement structural design - Low-volume road design / - Pavement design procedures for rehabilitation of existing pavements : Rehabilitation concepts - Guides for field data collection - Rehabilitation methods other than overlay - Rehabilitation methods with overlays / - Mechanistic-empirical design procedures.
This volume highlights the latest advances, innovations, and applications in bituminous materials and structures and asphalt pavement technology, as presented by leading international researchers and engineers at the RILEM International Symposium on Bituminous Materials (ISBM), held in Lyon, France on December 14-16, 2020. The symposium represents a joint effort of three RILEM Technical Committees from Cluster F: 264-RAP “Asphalt Pavement Recycling”, 272-PIM “Phase and Interphase Behaviour of Bituminous Materials”, and 278-CHA “Crack-Healing of Asphalt Pavement Materials”. It covers a diverse range of topics concerning bituminous materials (bitumen, mastics, mixtures) and road, railway and airport pavement structures, including: recycling, phase and interphase behaviour, cracking and healing, modification and innovative materials, durability and environmental aspects, testing and modelling, multi-scale properties, surface characteristics, structure performance, modelling and design, non-destructive testing, back-analysis, and Life Cycle Assessment. The contributions, which were selected by means of a rigorous international peer-review process, present a wealth of exciting ideas that will open novel research directions and foster new multidisciplinary collaborations.
Presents a complete coverage of all aspects of the theory and practice of pavement design including the latest concepts.