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2.3.4 Permeability testing <br />Falling head permeability tests were conducted and coefficients of permeability were calculated <br />according to the standard outlined in ASTM PS 129-01. Laboratory permeability tests were conducted on <br />a total of 68 samples from 18 locations. The laboratory equipment used for the tests is shown in Figure <br />8a. <br />2.3.5 Tensile strength ratio testing <br />The tensile strength ratio (TSR) test measures tensile strength loss due to damage under accelerated <br />water conditioning in the laboratory. The modified Lottman tensile strength ratio (TSR) test was <br />conducted according to AASHTO T 283. TSR tests were applied to a total of 18 specimens. The laboratory <br />equipment used for the tests is shown in Figure 8b. <br />(a) <br />(b) <br />Figure 8. (a) Asphalt permeability test and (b) TSR test rig used for the project research <br />15 <br />