The Crittenden press. [volume] (Marion, Ky.) 1919-current, 1922-07-07

frrsuafsf b. ths Waited States nsrauusni
~ AEfrafurf
A comprehensive program ~ road.
building research and Investigation
during the coming season ni ihe A..
lugion Experimental station near
Washington. D. a., D. announced by
the hureHu NJ public uads NJ Che
United States department N Agri.
culture Impact tests on pafemrnis.
suhgrade studies and other expert
menis which lusi 1rr urn1sel much
Interest among engineers vlil he con-
ulurl as aeil as several other lines
lf aofk underway nsf yraf and new
Goes to Del stated
niumin0us wearing surfaces are o.
tt Investigated in determine fhr frn.
an flf CO. formation Hf saves nni
irregularities and fH settle mu0iel
lurafI.ns concerning ihr proper miA.
iurr and fhe rroref mineral aggregates
ia bel usel lu hiumlnnus roads Nor
THAN nl seri'0ns ~ different tfrfs ni
HumlnaHs construction via he built
Ttese uIu Include mixtures of differ
eco mechanical Erui.ns and siih
different nfutninrs N h.iumen ~
several dfgrers 0f hariness SECTIONS
ore being Constructed on "a circular
iurk shout o. feet ln clrrumfrfrnfr.
ihe roadway being % feet Wide. uu
this rundanv Will he Operated ..
Coo army imct eguirfei with sfiid
tires The tfuct aiii Boz operated in o
varying path so as t0 cover practically
ihs snf'rs aliih ~ the Roadway All
uiu futri no r. sresl uf from D. I'd
a. miles an hour Or fts or sN
months. % until s0me results ore o.
. tanned leading fo tle solution ~ ths
problems Involved
Rstttancs 20 Wear
There ls considerable dlsrussl1n a'
o. ahaf BE- thc proper criterion iU h'
lsri ln selecting au1 iuiE.us cun.rsf'
neammies chat uln offr the erraf
rsf amHuui nf resistance fa scar Al
ihe present ume Judgment d. hasr'
au urlr tests made m Co., laboratory
and uron ths- 0omrfesslte sirousih a
canrrrfe nisn ur0n fhr structural
strength nf ranrreir hflma rlusiulfrl
ani brnkru ln ihr laboratory TIE cum
uansan of ihr ut1f III concrete bel
nciual usr u read suriaCrs uIf.
co., Indications ohn.nei ir lah0fuiori
experiments o. not wholly satisiac
tnrl
To- throw more nEht on this sub
set o. wear test ls in BEL made VIA
the coniii.ons arrrs.mafug those
nriuany found on coo rad THIS tcs
ulu include about 90 sections NJ cnn
rr,ie ueafluE surfuoe each sr0iI0i
heIng 10 different qualify ~ con
crete. ihe qualities boiue varied h'
virtue 10 che different aeEfrgaios usel
finereni proportions in ~ mIKiuu
ind amount ~ mixing wafer Thes
SECTIONS urr in tr Constructed ou
circular runway about go fcct in c.r
cumfetnoe. the runway ho.ng . feo
ulfr
CA this runway wni D. operated
. specially constructed rar with tu,
TRUCK wheels equipped with su'l.
rubber Tires and loaded o. roproscn
r truck. The car viii be- guided h
small ullruad rails 90 bold Il ln I.osN
lion. thc power being applied by mean
Of nn elecirlc snoinf o. the ruar uhee
THIS apparatus vill BE- 0peraicd aruunN
the circular runway at a sprrd 81
probably ~ miles an hour. The g.
win Involve the use ~ truck wheel
rquIppsd with different kinds ~ lire
and viIl Include the use ~ uun-ssh
'halns A sicelilrrd wheel vii
probably also be- used to rci the cfeg
1f un accelerated wear test
The object ~ this experiment is O
determine the relative wear % o.