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22 applied at the end of Lanes 3 and 5 for 100% and 50% cover- age, respectively. Figure 16 illustrates 50% coverage of SS-1h for each application rate compared with a typical section with 100% coverage. Both trackless and CRS-1 emulsions were applied to Lanes 3 and 5 in a similar manner at three application rates (0.031, 0.062, and 0.155 gal/yd2). 3.2.4 Overlay Construction A 12.5-mm NMAS HMA mixture was placed on top of the tacked surfaces at a thickness of approximately 3 in. A mate- Figure 12. Preparation of test lanes for tack coat rial transfer device was used to transfer the mixture from the application. haul trucks to the hopper of the paver (see Figure 17b) in (a) Dust Application (b) Tack Coat Application on Dusty Surface (c) Water Spraying Using a Hose (d) Overlaying on Wet Surface Figure 13. Simulation of dusty and wet conditions.
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Figure 14. Spraying process plan for four lanes at the test site. Figure 15. Distributor truck spray application at 50% coverage.