DUST PREVENTION AND ROAD PRESERVATION, 1914, | od 
Section No. 8 (REFINED WaTER-GAS TAR PREPARATION—SURFACE TREATMENT). 
The surface presents a very uneven appearance, owing apparently 
to the motion of the surface mat under traffic. A few small chuck 
holes have formed where raveling seems imminent, although in general | 
the surface is very well bound. The section will probably require 
some repair and a surface treatment during the coming spring. 
Section No. 9 (AsPHALTIC PETROLEUM—SURFACE TREATMENT), 
Toward the close of the season of 1914 this section began to give 
evidence of considerable wear. As in previous seasons, deterioration 
became more marked in the third of the road nearest the gutter and 
was most evident over the south half of the section, where an ex- 
ceedingly heavy rain had interrupted the progress of the previous 
surface treatment. Two badly raveled places, each about half a 
Square yard in area, and a few smaller depressions were patched by 
the penetration method with new 14-inch limestone and a heavy oil- 
asphalt, rolled with a 10-ton roller, and finished by the application 
of a seal coat of the same bituminous material. Several humps were 
removed by cutting them flush with the surface by means of a mattock. 
Immediately after these repairs had been made, on October 17 and 
19, a surface treatment was applied over the entire section, using the 
same trade product as in the two previous treatments, and a fine 
torpedo sand. The surface was first thoroughly swept with fiber 
hand brooms, and the oil applied by allowing it to run from the bungs 
of the barrels and distributing it with push brooms. The oil was 
immediately covered with sand and the road opened to traffic. The 
bituminous material cost 8 cents per gallon, and the sand cost $2.12 
per cubic yard on the work. 
Table 22 gives an analysis of the bituminous material, and the cost 
of surface treatment is given in Table 24. 
TaBLe 22.—Analysis of asphaltic petroleum ! used in surface treatment of section No. 9. 
SDSS (04 aI Uti ie UGS AS SMe pea aR Ete RNS ata MN cle Mh Ay aM ERUPT i 0. 964 
LP VSTa) BORING Se See RO ak Stree uM Maat he eae N Meats eo oe ak ieMcaet A Aeeee see A ae $@z 40 
JSAP UIT ey ROTO er eth Ee sO aeae eerie Oh ve emieeia RAR a ame eM pend en tn SCE 85 
SPecthicaviscostiyeebmclen. Joma C.* SOLCr Cr onan wine Cnn ee ea amen see Ines} 
Bossmoumoursiat 1632 Cy. 20soramMsts re sce hk oe oe per cent.. 26.46 
RCAiibe St OlpGESIGILe sale aong, Oa (UimMe alas ine ee) eS iN aa Moai 3/ 46/7 
Meat vest olresidue at oO ©. Guimmle ye 21/2 Fe Oi VES Ch) | eet EE Ge a AA 
Percentage of total bitumen insoluble in 86° B. naphtha.........-.....---. 7.43 
eed eCARDOM nc wince ly curt aerate oat ee per cent 5. 04 
Solublenme®ss.qtoval’ bitumiem)eais ss fei), DIONE Ag Tae Comet 19 9592 
Oranumerna treramsOlmble: nue = Mmm er by ayer diene) TS bd ol) eee a dora . 06 
iiteneaiatenmai veransoluiler: case: se sary Peo No Sagas Sec aes ane domes 02 
ANG IBN Meee ie Ra ES Sis Oi A WAI OS Ss Dh 2 ee a dons 100200 
1 Fairly viscous, sticky fluid. 2Very viscous, sticky fluid; glossy. 
