A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Design and Performance Evaluation of Very Thin Overlays in Texas
Very thin overlays 1-inch thick or less were placed as surface layers on five major highways in Texas. These mixes were designed in the laboratory to have a balance of good rut resistance as measured by TxDOTs Hamburg Wheel Tracking test and good reflection cracking resistance as measured by TTIs Overlay Tester. These Crack Attenuating Mixes (CAM) were designed and constructed based on a new special specification SS 3109. In the design phase the optimal asphalt content was initially determined using the Superpave Gyratory Compactor selecting the asphalt content that achieved 98% density after 50 gyrations. This approach worked well with stiff binders and top quality granite aggregates. However design problems were encountered with the transition to softer binders and locally available materials. The researchers proposed an alternative design procedure where the performance tests are run first at a range of asphalt contents and a window defined where both rutting and crack resistance requirements are met. The CAM mixes designed have 100% passing the 3/8-inch sieve and binder contents ranging from 7 to 8.3% asphalt.
Design and Performance Evaluation of Very Thin Overlays in Texas
Very thin overlays 1-inch thick or less were placed as surface layers on five major highways in Texas. These mixes were designed in the laboratory to have a balance of good rut resistance as measured by TxDOTs Hamburg Wheel Tracking test and good reflection cracking resistance as measured by TTIs Overlay Tester. These Crack Attenuating Mixes (CAM) were designed and constructed based on a new special specification SS 3109. In the design phase the optimal asphalt content was initially determined using the Superpave Gyratory Compactor selecting the asphalt content that achieved 98% density after 50 gyrations. This approach worked well with stiff binders and top quality granite aggregates. However design problems were encountered with the transition to softer binders and locally available materials. The researchers proposed an alternative design procedure where the performance tests are run first at a range of asphalt contents and a window defined where both rutting and crack resistance requirements are met. The CAM mixes designed have 100% passing the 3/8-inch sieve and binder contents ranging from 7 to 8.3% asphalt.
Design and Performance Evaluation of Very Thin Overlays in Texas
T. Scullion (author) / F. Zhou (author) / L. Walubita (author) / S. Sebesta (author)
2009
80 pages
Report
No indication
English
Highway Engineering , Construction Equipment, Materials, & Supplies , Transportation & Traffic Planning , Transportation , Pavement overlays , Surface mixes , Thin overlays , Infra-red , Texas , Rutting , Cracking , Skid resistance , Ground penetration radar , Recommendations , Figures , Tables (Data) , Very thin overlay sections , CAM mixes , Crack Attenuating Mixes (CAM) , High performance thin overlays , Rolling dynamic deflectometers
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