38 BULLETIN 586, U. S. DEPARTMENT OF AGRICULTURE. 
TABLE 41.—Analysis of asphaltic petroleum: used in re-treatment of experiment No. 1. 
Specitieipravity (250/20 Css oe eh ene ee Eek oie ee a ele ei ees 0. 956 
Flash pointi(PiQyeweds oes See ea else ne eee aE Rea ih eee 28 
Brian WOME (eC) sets are oe sick 2 OR os Richie ec ce cag ag ea ap at A 50 
Specie vascesttyeNmeler,|25° C1 s0iese.2 8. a. cece See ee ec ee ee a 187.5 
floss.at 1635-C., sthouns,20/arams)(pericent)). jy.02.) - ee ete es ee 28. 23 
Bloat test onkresidues4 50%'C: (Seconds): UF Eset oF Bier Ne ae eee 188 
Per cent of total bitumen insoluble in 86° B. naphtha.......---------.-.--- 16. 58 
Fixed (carbon: (periGent) bed see ele 2 ne oo pete ot aie oe ee ht epee eae +8 9. 04 
Total. bitumen: Goluble imsCSayeabe. van at he eee ee per cent.. 99.95 
Orcantc matter insoluble .30 Be. 2). Asi 98 Soe eg oe epee per cent. - . 05 
Jnoreanic matter insoluble s-tessesase ca. tele eee ins << ee see per cent. - . 00 
100. 00 
Experiment No. 2—Residual asphaltic petroleum, hot application, 
corresponding to experiment No. 5, on the Rockville Pike.—This section 
was in generally good condition. There was a slight tendency to 
crumble, especially at the edges, but little or no mud formed. It 
was thought very early in 1916 that this section would require re- 
treatment during the summer, but it bled profusely and had to be 
dressed heavily until about the middle of the summer. The section 
appeared to be somewhat better than section No. 5 of the Rockville 
Pike. 
Experiment No. 38—Coal-tar preparation, cold application.—The 
original application on this section never produced a close intact 
mat and in the summer of 1916 had to be patched frequently where 
the macadam had become exposed and in November was retreated 
with the same bituminous material as applied originally. The char- 
acteristics of the bituminous material appear in Table 42, and cost 
data and quantities in Table 43. At the time of inspection the ex- 
periment was in excellent condition, with no signs of further disinte- 
eration or unusual wear. : 
TABLE 42.—Analysis of coal-tar preparation * used in retreatment of experiment No. 3. 
Specific eravity; 205/20 pO. eroce ap ete aeea tate Pe Mr eA hg Ayo Pu 1.149 
Specitie vascosity,emeler 50;es ¢ wat 40 gnOre 2 he See mean 120 
Rercentireetcarbom (insolulblemn Css) 5. oo eee ere eae eee eescee 6.19 
Sabie 5 Per cent Per cent 
Distillation: by volume. by weight. 
Wateruitte mse tise taiee: . eee eee. Te! oes eek ee ey segs 0.0 0.0 
Hirstilieht o1lsi4i(to 110°) C3). 4 ta ote: 22 2 See ee ers 1.8 lea! 
Second lich tious 2 (10> to70y Cans + Bees eee esate = 1.5 8 
Heavy oils ® (170° to 270° C.).....-.- Be at nL eens 19.8 Wet 
Heavwiouls'4 (2700. 300% C2)) Oo -senapre: Loe ae easels: 9.0 7.8 
Pitch Tesidue. ns casecs gost aos eee eee eS ee RN 67.9 73.2 
HAN) il san Ale ane A RR) 5 Rees eas a RE 100.0 100.0 
1 Fairly viscous sticky fluid. 4 Clear. 
2 Very viscous sticky fluid. 6 One-half solid. 
3 Fairly thin fluid. 
