Figure 13-29.-Field identification of unknown bituminous materials.Advantages and disadvantages of the bituminousare very temperature-susceptible, having a wide rangematerials used in construction are discussed.in viscosity with normal ambient temperature changes.Asphalt cement cutbacks are flammable. Also, allTar can become so soft during warmer weather that theasphalts can be dissolved by petroleum products thatpavement will rut under traffic. In colder weather it canbecome so brittle that the pavement will crack.may be spilled on them, such as during refueling at anairfield. Tars, on the other hand, are not affected byAsphalt emulsions are not flammable and are liquidpetroleum derivatives since they are products of coal.at normal temperatures. Since they are mixed withTars, when used as a prime for base courses, also seemwater, they can be used with a damperto possess better penetration qualities than asphalts. Tarsrequired for the cutbacks. Additionalaggregate thanwater may be13-40.-. .*— —. .- L- —A-.4 . . ..+h ..* fi+-Pnllrw1= IISFX 1.
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