A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
An asphalt intersection with a history of rutting and shoving problems was selected to determine whether Ultra-Thin Whitetopping (UTW) would be a viable alternative to placing a bituminous overlay. The project selected was the intersection at Route 169 (Belt Highway), Route YY, and Mitchell Avenue in St. Joseph, MO. The UTW project consisted of coldmilling 3 inches of the old asphalt surface, placing a 3-inch concrete overlay, and sawing the concrete overlay into 3 foot by 3 foot squares using early entry saws. The project was completed during a 60-hour period using a high-early strength concrete mix, gradation 'F' Bethany Falls limestone and fibrillated polypropylene fibers. The design strength of 3500 psi was monitored using a maturity curve and was achieved prior to 14 hours after placement. Construction practices were monitored, as well as performing concrete tests, molding concrete specimens for later testing, and drilling cores for bond strength tests. Visual surveys were performed prior to and immediately after coldmilling operations and after overlay placement. Falling Weight Deflectometer (FWD) testing was performed prior to asphalt milling and after overlay placement. The FWD testing indicated a dramatic decrease in both the radial strain and the vertical strain following the overlay.
An asphalt intersection with a history of rutting and shoving problems was selected to determine whether Ultra-Thin Whitetopping (UTW) would be a viable alternative to placing a bituminous overlay. The project selected was the intersection at Route 169 (Belt Highway), Route YY, and Mitchell Avenue in St. Joseph, MO. The UTW project consisted of coldmilling 3 inches of the old asphalt surface, placing a 3-inch concrete overlay, and sawing the concrete overlay into 3 foot by 3 foot squares using early entry saws. The project was completed during a 60-hour period using a high-early strength concrete mix, gradation 'F' Bethany Falls limestone and fibrillated polypropylene fibers. The design strength of 3500 psi was monitored using a maturity curve and was achieved prior to 14 hours after placement. Construction practices were monitored, as well as performing concrete tests, molding concrete specimens for later testing, and drilling cores for bond strength tests. Visual surveys were performed prior to and immediately after coldmilling operations and after overlay placement. Falling Weight Deflectometer (FWD) testing was performed prior to asphalt milling and after overlay placement. The FWD testing indicated a dramatic decrease in both the radial strain and the vertical strain following the overlay.
Evaluation of Ultra-Thin Whitetopping
D. Amos (author)
2001
78 pages
Report
No indication
English
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