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CHARACTERISTICS  AND USES OF BITUMENS - 14071_307
FIELD IDENTIFICATION OF BITUMENS - 14071_309

Engineering Aid 2 - Intermediate Structural engineering guide book
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Figure 13-29.-Field identification of unknown bituminous materials. Advantages  and  disadvantages  of  the  bituminous are very temperature-susceptible, having a wide range materials  used  in  construction  are  discussed. in  viscosity  with  normal  ambient  temperature  changes. Asphalt  cement  cutbacks  are  flammable.  Also,  all Tar can become so soft during warmer weather that the asphalts  can  be  dissolved  by  petroleum  products  that pavement will rut under traffic. In colder weather it can become so brittle that the pavement will crack. may be spilled on them, such as during refueling at an airfield. Tars, on the other hand, are not affected by Asphalt emulsions are not flammable and are liquid petroleum  derivatives  since  they  are  products  of  coal. at normal temperatures. Since they are mixed with Tars, when used as a prime for base courses, also seem water, they can be used with a damper to  possess  better  penetration  qualities  than  asphalts.  Tars required for the cutbacks. Additional aggregate  than water may be 13-40 .- .    .*— —. .- L- —A-.4 . . ..+h ..* fi+- Pnllrw 1= IISFX 1.







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