United States Department of Transportation
i
Pilot Implementation of Whitetopping : Final Report.
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2017-12-01
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[PDF-3.44 MB]
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Abstract:The design of whitetopping has been based on experience. The current TxDOT whitetopping design is based on American Concrete Pavement Association (ACPA), which does not consider the condition of existing asphalt pavement. Recognizing the limitations of this procedure, TxDOT sponsored a research study to develop mechanistic-empirical pavement design for whitetopping under the TxDOT Research Project 0-5482. Two whitetopping projects were constructed and their mechanistic behavior and early-age performance have been evaluated, with the primary objective being to validate the design procedure developed in 0-5482. However, the whitetopping projects are less than 2 years old, and the validation of the procedure for long-term performance could not be made. However, performance evaluations of a number of whitetopping projects built under old designs have provided valuable information and design guidelines were developed. The performance of the two projects with 6-ft by 6-ft joint spacing needs to be monitored for the differential slab movements potential at longitudinal joints to determine whether tie bars are necessary or not. Until more conclusive findings are made, it is recommended that tie bars are not used in whitetopping. All the whitetopping projects in Texas, except for the section in Loy Lake Drive, did not have joints sealed. No adverse effects of not sealing the joints have been observed in whitetopping projects in Texas. The performance of the Emory project needs to be monitored for the evaluations of joints with no seals in high rainfall areas. At this point, national efforts are underway by ‘Seal or Not Seal (SNS) Group’ to positively determine whether sealing is really needed for joints in CPCD or whitetopping. Until SNS suggests conclusive findings and recommendations, it is recommended that joints in the whitetopping are not sealed.
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