MACADAM - Uniformly sized stones rolled or compacted in-place, and usually sealed by an asphalt, GRAVEL RUNWAY - A runway, typically constructed of a mixture of compacted soils and stones, with a surface that is not bound by any additives, FLEXIBLE PAVEMENT - consists of a surface layer of bitumen-bound aggregate (asphalt concrete), RIGID PAVEMENT - constructed of portland cement concrete slabs resting on a prepared subbase of granular material, SEAL COAT - is usually an unpaved (gravel) runway, the surface of which has been treated with a spray sealant, SLURRY SEAL - A mixture of well-graded fine aggregate, mineral filler, emulsified asphalt and water, applied to a runway as a surface treatment., Load Factor - aircraft’s gross weight, Environment Factors - extreme weather conditions such as snow and heat, Structural Design Factors - rigid or flexible, Construction Factors - layers include the sub- grade, sub-base, bearing course and surface,

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