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2 CHAPTER 2 OBJECTIVE The objectives of NCHRP 9-27 were to (1) determine the meability characteristics of compacted samples at different minimum t/NMAS needed for desirable impermeable pave- thicknesses, and (3) evaluate factors affecting the relationship ment density levels to be achievable, (2) evaluate the per- among in-place air voids, permeability, and lift thickness.