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2.3.2 Hamburg wheel tracker testing <br />Circular specimens were tested using a Hamburg wheel tracking (HWT) device. AASHTO T 324 <br />procedures were followed for all tests on a total of 18 specimens from 18 locations. The laboratory <br />equipment used for the tests is shown in Figure 7a. The tests were conducted using paired specimens: <br />the first of the pair was compacted with the chip seal, the second of the pair was compacted without <br />the chip seal. <br />2.3.3 Fracture energy testing <br />Disk -shaped compact tension (DCT) tests were conducted on specimens to evaluate the fracture energy <br />of asphalt mixes and field specimens. DCT tests were conducted on a total of seven specimens, and all <br />tests were conducted in accordance with ASTM D7313. The laboratory equipment used for the tests is <br />shown in Figure 7b. <br />(a) <br />(b) <br />Figure 7. (a) Hamburg wheel tracker test machine and (b) DCT test machine used for the project research <br />14 <br />