DUST PREVENTION AND ROAD PRESERVATION, 1914, Tae 
ROAM RESS RUE 2rt Oran (ULTITO)EN PL SPR a IR CIC SAL of share Ee SNR MEE Ie hue 8 aa Za, 
FiloaigiestrataQmyO@xc(bliNe) ios glk. 7 be rere ois cee PR LSN AS ensth 14/7 
Posse ohouns ates. Or 20onamsis soe oe oe eis eh ee a pen cent. 16.82 
filoaintesuOncres(aWle ators al (CIMNG) eter. 2 anime ei C7 wer tema nea rey atc 67.307 
Mieaditest OM resiuue atoo- (© (UINe = Were eas eee ee shan th eA eA 
Percentage of total bitumen insoluble in 86° B. naphtha................... G37 
erecncan DOM eres shakin esti. eek rot. CEs. eke pen centre 4, 64 
HoluplemneGs (botulewlGUINem)) aires ok ee ce ernie don OOS 
Greantesmacterimsoluble mesa See ek SARS Ee ee ee dowes: . 05 
lmorvamicrmatter isolublesa. Meet fos Si oe LS ee Se dows . 08. 
IONE Lessee gy Dears lone aman sea RSM iMG Le ae nes ie Sls dor. 1007 00) 
Method. The rock course was rolled until firm, after eaeit dust- 
less screenings were scattered lightly over the fare surface, partly 
filling the larger voids. The rate of application of the bitumen was 
1.39 gallons per square yard at an average temperature of 105° C. 
The bitumen flowed readily and penetrated completely when allowed 
to stand for a sufficient time. Frequent rains during the treatment 
of this section handicapped the performance of the work and at times 
necessitated sanding immediately after the application of the bitumen. 
A. From stations 3+ 68.8 to 5+ 15.5, sand was used as a top dress- 
ing. This section bled profusely and unevenly for about two weeks 
after construction, forming a sand mat of uneven thickness. In those 
areas where there was no bleeding the surface had a light brown color 
and the bitumen seemed to have become somewhat absorbed in the 
rock itself. Traffic was permitted the use of this portion of the 
experiment immediately after construction. 
B. From stations 5+ 15.5 to 5+84, dustless screenings were used 
as top dressing and there was no bleeding over this area. Traffic did 
not use this section until three weeks after construction. 
EXPERIMENT No. 5 (Ort-ASPHALT—PENETRATION METHOD). 
Location: Station 5-+84 to station 613248 feet. 
Area: 80 square yards. 
TaBLe 7.—Analysis of oil-asphalt. 
SC CMM R OMA Lye Og Oey Oe. ek its mtn a, ete e ee. Ne UR SIRE ee 1. 908 
iiss FTA @e 5 OVOSLDY Behe che ary isles ca) are aN ens an ya Senne aioL me ae nian ar Nennn gE Roy OR Os) 
ReMetrAllon 207.05 100 eras: o Seconds 4255.22.01 62 sor Nene rao anla yo IK OL Wy 
Oss Omouts at 16s Or420 grams hers Lae ety ESPN Atos per cent.. . 44 
nencimarion Om residue, asaboven ust ieee a Pico SO agen 19) 
Percentage of total bitumen insoluble in 86° B. naphtha................-.. 23-9) 
Erbe Ce Car DOM ce Sn ann me pA SoS oon ek per cent.. _11. 06 
Poliplein- OS (tovdl jbitwmen\iiy. Jia See sais. pee ee bolls dove. 99286 
Ore ane naa tere MsOMMle yi. Be: se A ie oS ase oPreretccras Fo eee oe doaa.: SO) 
iniouc mmc rmatveriasOlMble wi eae 0) est Ne ei a doe ce. . 04 
AR Gy iret ee aR a MLN CON dentine Let Pony ome OM 8 ii AO ase doles LOO CO 
