In order to make a proper comparison between the performance of crack router and the existing device used by Nebraska Department of Roads , a field test was conducted in October 2016 at Nebraska Department of Roads’s location in York.
NE (Figure 4.3). For this test, 14 crew members worked with both devices (i.e., crack router vs. DOAN router) to cut cracks in asphalt and concrete surfaces. Nebraska Department of Roads was asked to select crews with experience working with the department’s existing device to participate in the test. Fourteen crews were selected and participated based on Nebraska Department of Roads recommendations. Both devices were tested by each crew separately on both asphalt and concrete surfaces and under conditions similar to those encountered while working at real project sites. The tested cracks were generally vertical or transverse.
During each test, quantitative data and user feedback were collected through a survey (Appendix A) designed by the researchers and approved by Nebraska Department of Roads. Table 4.1 lists the feedback Nebraska Department of Roads’s crew provided while comparing crack router with the existing machine. In addition, Figure 4.4
shows the quality of cracks routed by crack router.
