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55 TABLE 40 SUMMARY OF SERVICE LIFE FACTORS Service Life Factors U.S. Canada Total Underlying Pavement Structure 14 6 20 Original Substrate Surface Quality 12 4 16 Traffic Volume 5 0 5 Cold Climate Considerations (freeze/thaw cycles, 5 2 7 snowplowing, etc.) Maintenance Funding 2 1 3 Friction Loss 3 0 3 Construction Quality 0 1 1 Do Not Know 2 0 2 treatment's characteristics. Thus, training in this specific area 2. Contractor experience was cited as the most important is vitally important. factor affecting microsurfacing quality. With this iden- tified need for competent contractors, a microsurfacing certification program would furnish a means to iden- SUMMARY tify competent microsurfacing contractors. This chapter reviewed the primary issues associated with 3. Project selection is probably the most important step microsurfacing construction quality. As a result of the analysis in the microsurfacing design process with regard to one effective practice, the pre-paving quality meeting, and one impact on the final performance of the microsurfacing area for future research, were derived. The notion that "putting itself. the right treatment on the right road at the right time" (Gale- house et al. 2003) was validated by this analysis of quality man- Effective Practices agement practices. This confirms the idea that agencies that are considering microsurfacing need to invest the appropriate The following effective practices were identified in this amount of time during the maintenance project programming chapter: process to ensure that those roads selected to receive micro- surfacing are indeed good candidates for this treatment. 1. Holding a pre-paving meeting to discuss quality man- agement and workmanship issues before full produc- Conclusions tion microsurfacing provides a forum where both the agency and the contractor can address main areas and The following conclusions were reached in this chapter: concerns about microsurfacing quality. 2. Focusing agency construction quality assurance efforts 1. Microsurfacing is viewed as a valuable pavement preser- on those microsurfacing factors that relate to the vation treatment rather than merely a pavement main- quality of the workmanship and other field-related tenance treatment. aspects.