Laserfiche WebLink
Figure 2.8. Asphalt Pavement Analyzer (APA), or Rut Tester <br />This test was performed under dry and wet (submerged) conditions. The wet APA was <br />intended to simulate the three factors identified in the literature search as contributing to the <br />stripping phenomenon: presence of water (saturation), high stress and high temperatures. Figure <br />2.9 and Figure 2.10 show the rut depth vs. the number of applied cycles for the wet and dry tests <br />respectively. Table 2.1 shows the average rutting rate in mm per hour (mm/hr) for the three air <br />void contents in the two different testing conditions (wet and dry). For consistency purposes the <br />average rutting rate (measured rutting/number of cycles) was computed based upon the same <br />number of cycles for both testing conditions, the test conditioned that governed the number of <br />cycles appears as bold in the table. <br />B-14 <br />