Evaluation of the performance, cost-effectiveness, and timing of various preventive maintenances : interim report.

680323884PDFTech ReportCDOT-2010-310.5PavementsRepairingHighway maintenanceColoradoColorado. Dept. of Transportation. Research BranchShuler, ScottUnited States. Federal Highway AdministrationNTL-HIGHWAY/ROAD TRANSPORTATION-Construction and MaintenanceNTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and PerformanceUS Transportation CollectionThis research study evaluated the performance of various pavement preservation treatments over time and under differentenvironmental conditions to quantify the economics of each treatment type. There are three primary techniques utilized in Coloradofor preservation of asphalt pavements and three for concrete pavements. For asphalt pavements these are crack sealing, chip seals, andthin hot mix asphalt overlays. For concrete pavements the treatments are joint resealing, cross-stitching, and microgrinding. Full-scaletest sections were constructed in 2005 and some additional test sections previously constructed were also included for performancemeasurement. These test sections include crack sealing, chip seals, thin overlays, joint resealing, cross-stitching and microgrinding.Test results indicate that continuation of crack sealing, chip sealing, and thin hot mix overlays is justified for asphalt pavements.Performance results of the preservation treatments for concrete pavements were not as successful. Propagation of the crack into theadjacent slab occurred in the cross-stitching test sections. Microgrinding concrete pavements does not appear to be effective atreducing cracking and may be detrimental to performance. The disappointing results of the joint resealing test sections indicate that areview of the specifications should be considered.Implementation:The Preventive Maintenance Best Practices Manual is Appendix A of this report. The methods described in this manual are based ona review of the literature, a series of interviews conducted in each Colorado DOT region, full-scale field test sections, and experienceof the researchers. These best practices should be followed when preventive maintenance procedures are conducted on asphalt andconcrete pavements in Colorado