Agenda - Council - 02/11/2020 - Laserfiche WebLink

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CHAPTER 2: EVALUATION OF CHIP SEALS IN MINNESOTA City and county engineers collaborated with the research team to identify 18 locations for the study of chip seal performance, most notably stripping. These locations were used for field testing (i.e., distress condition surveys and density testing) and pavement samples (to be used for further laboratory studies). The following sections describe the locations visited and tests conducted as a part of the project work. 2.1 FIELD LOCATIONS In the early stages of the project work, during October 2014, members of the research team visited 31 locations in Minnesota as potential sites of stripping in chip seals that could provide data for research. The original 31 sites considered for study are summarized in Table 1. Of the sites considered, 18 were selected for inclusion based on a combination of factors, including the ability to obtain intact cores, the possibility of stripping, and proximity to the Minneapolis -St. Paul metropolitan area to limit travel costs. The primary 18 sections, located in seven municipalities and one county, consulted for the project work are indicated in the subsections below and shown in Figure 2. Appendix A to this report provides survey condition and core identification information for each location, and Appendix H provides all section information provided to the research team by city/county engineers during the project work. In addition to the primary sections, additional pavement sections were assessed for the project work. Those additional sections will be noted where applicable (e.g. nuclear gauge testing included extra test locations in six municipalities). (a) (b) Figure 2. (a) State view and (b) Minneapolis -St. Paul metropolitan area view of locations of pavements surveyed for field and laboratory work 4