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MI <br /> Management District in California. However, Voc emissions <br /> Quality etroleum <br /> resulting from the excavation and handling of p <br /> contaminated soils may be regulated. <br /> ASPHALT CHE141STRY <br /> or are <br /> Asphalts are bituminous materials which occurnarally or are <br /> derived from nondestructive separthrough fractional <br /> of petroleum Or <br /> Typically, this is achiesehaltrshauldrnotlbeac nfusedlwith ntar <br /> solvent de-asphalting. p of coal, wood, <br /> which is obtained through destructive processing <br /> or petroleum. Asphalt cont ains aliphatic. mOand ndiffers uclear afrom ttars <br /> and polynuclear aromatic compounds (PN <br /> which contain primarily mononuclear andd PNAHs. <br /> Structurally, as_rhalt is considered to be either a colloid <br /> an <br /> sting of asphalt micelles suspended in oils or ne <br /> intersnicellar resin phase: or a solution of aspa <br /> categorized <br /> dissolved <br /> consi <br /> are <br /> in the oil-resin phase. hhaltsalt 2.tThese smaterials are described <br /> asphalt cements or liquidasp <br /> as follows: <br /> is <br /> heaviest fractions ohalt. <br /> mbetween <br /> o As halofthesematerialsranges <br /> The consistency <br /> id at room temperature. At least <br /> solid and semi-liqu' roduced and are <br /> five grades of asphalt cement are. produced <br /> categorized based upon their deeneraI thehardness <br /> heavierr <br /> resistance. to penetration. in g by high <br /> fractions of asofaaromatich(both moncnucclear and <br /> concentrations nitrogen, sulfur, oxygen and trace <br /> polynuclear rings) , ic <br /> amounts of metals or organoused inehotlmixctechnologiesPhalt <br /> cements are typz Y <br /> om <br /> 4 Liquid asphalts lio ihesresidualrasphaltCeorfby the <br /> lighter fractions <br /> dissolving asphalt cements in solvent or emulsifying <br /> s in water. These materials are u <br /> asphalt cementsraded <br /> cold mix technologies. The liquid asphalts are g . <br /> by their viscosity. The four grades of liquid asphalt . <br /> are 3000, 500, 250 and 70. The numbers indicate <br /> The <br /> minimum viscosithe <br /> ty for the established grade. <br /> acceptable viscosities within each grade <br /> a specified range. For instance, of anywhere between <br /> asphalts may exhibit a viscosity es of <br /> 3000 and 6haltcearesdekcribeds. easlfollows;fferent tYp <br /> liquid-asp <br /> _ ced <br /> Rapid curing (RC) liquid asphalts are pro uin a <br /> - -T - - <br /> dissolving relatively hard asphalt cements <br />