DUST PREVENTION AND ROAD PRESERVATION, 1916, ie 
TABLE 60.—Analysis of wdter-gas tar preparation’ used in surface treatment of concrete 
experiment. 
SROOMCIETA VIE 2 OCIA Onis tise keyed Bet OR ee a bots uo eon 1.155 
Moatibest)32° ©. (seconds),321;\50° C. (seconds) 2222220400 os ee Le ek es 84 
Percent free Carbon..-..-..---.-5.--5-- ae itl etl Saat Tey ghAL/ A BN 2 PAU By, Bes 
Per 
Fer gent cont 
Soy eee vol- 
Distillation: oe meiene 
VETS id 2 SAR A ete eg TEIN Spe a ate SR a Weg cr eta 0.0 0.0 
Barcigictt, otis, (tolOl Os) je y.2 Sco) Ny eh ek oo 50) .0 
SOT AG Tires gee ol sh (UM ONS raya ck Oi) ss NM A I i a a el .0 0 
Eliemayg onlay CAO to 270 Oa) SN SAN EU SENRINS Sd AAD) 214.1 IAL, 2 
eA ayaOils' (20S stor sUOCkC, WaLce VEAL OPE TNO Ue 28.9 7.4 
JPSURCI D0 MSO ds Ud le He Ng gn PO al 2 MER eT A OR 377.0 80.9 
“NGC = 2 SiR I a rege ee NUNS Ta Og eT Rc 100.0 100.0 
: ; Per 
Dimethy] sulphate test: Percent _ cent 
s by vol- insolu- 
Fraction: ume, ble. 
COCO TSU eM Oa tee ra nant ROU SA Meee Os BSD. SONNE NG © SOLVE. (a5 8.9 0.0 
SIND RON IONS WGI apa ea Maes ae Sapam Peedi Bt tl eam 20.8 5.0 
BIO) Ties: SI SI Ogee Mee eB a Io) i OR NR ese lt kart Ee 7.0 17.5 
TABLE 61.—Analysis of petroleum products used in surface treatment of concrete experiment. 
See Sections I 
F, residual aug, as- 
asphaltic Ue am HO Ie 
petroleum, | ‘eum. 
Ss Bae araeity 257/25" C ile 2 Mh ih lee ae Oe SAP ER Me: ol ade OER SLR OE 0.993 0.945 
NST AS HAD OML Ug Cora ee arcu ste aloe nee ae ear resents No HOLA 2 ON RS ee ioeubenscaaec 37 
IBPHTEbLaY? Jaa AC SE poaee Bee REE Es aSe Oe coe ore Ee SND SEL a unre on er rmminey. rales lseasdeceocas 93 
puede WISCOSLUYMEl ORs 5OCs Case see eenisae cate ee elec cin ieee oe gcse eee clea 113.5 297.5 
Float test at 50°C. MSE CONG Sees e UC Bae CNN Eek ON ee 28) ae Ane 
Mossiat 1630\C*ajihours, 20/grams\iper centas..)l 22a ee eee 13.71 26.09 
Wloatitestonmesidies02 ChsSsecondse. ee i ne 151 101 
Per cent of total bitumen insoluble in 86° B. naphtha....................-....- 18. 63 14.67 
exe dca rbonsmeriCent sakes see eee ees cL eu NN 3 Nd ans 11.25 8.5 
Bitumen soluble in CS: (total bitumen), per cent...-.-.--.---------------+------ 99. 89 99.85 
Oreanicmarerinsolubles per Comb (5 5 544.) ween ae Ue eee -08 15 
Tnorganie matter msoluble, per cent............----------.-- 2222222 eee -03 -00 
FROLDINDORCEM Gasca ys oa Se eo clus Oraee Neva oc io 2) Sees ce nie eR I 100. 00 100.00 
1 At 100° C. 2 At 25° C- 
Sections I and J: These sections were much like C to F and had a 
_ rubbery mat with few breaks, but a tendency to push. With cold and 
moisture the mat became somewhat mealy under traffic. 
Experiments Nos. 4 and 5—Ouil cement concrete; cement concrete.— 
There was less distinction apparent this year between experiments 
Nos. 4 and 5. The gravel aggregate showed a very material wear 
in No. 5. The limestone appeared to be worn more than the gravel, 
as evidenced by conditions along the eastern 4 feet of the surface 
and especially over the last 50 feet of experiment No. 4, south of the 
Columbia Club main entrance. 
Experiment No. 6— Vitrified brick.—There has been no great differ- 
ence in apparent wear between the several sections of this experiment. 
1 Very viscous. 2 Clear. 3 Hard, brittle. 
