La Junta tribune., 1912-07-06

prscttcauy ~ enftre oSssus2unrp a
the rusd n pesdose1 b NE rar q
driving wheeaa u the eGer3 wyrp prs-
dpce1 b ssoioe ~ vscuso IL s~ftss
Of bsth iron, as1 re.s whre.. ssosit
be so@evhst simiisf n teaAe- -Ase~ma
spfarest To th~ writer. Therefore. tiss
the rod be~s sdapsed so u.o,ee tramr
10 the rad rhk-h viii tsrsa ep.Sus this
powerful tfarttre SHEAR. u has air~.Ay
been 0<Doertssted that no plais nsr.
sdsm rasd b e.Isbs- VI re,i.,ins ,hs.
fore.
The efforts of progressive hishv,y
eoEiseefs are thus directed psiman
Iy toward the Preservation Of our .too~
surfaced rosds and the coossY,,ctsyu Of
dnxtiess rosds hy the u.~ u . bind.
more powerful than stone duu and
secoodly. 10 minimizing " mitigating
'he dust nuisance.
For the purpose Of DISCUSSING in,ei!.
gently the experiments thus far cou.
Quoted with special binder. the term
dust pr~sentives" has i.reu spoIi.d
TO sII Of the various binder. h,rinx so,
their main object either Suppression OF
the prevention Of duss. Tbe>+ may be
divided into two classes. ,empoe,ry
and permanent The Temporary binder,
~erve merely as paiii.iIves and r~ouir,
frequent renewal The perma n<ni bind
ers. 40 called. enter into the s,ructur,
OF the road rs . constituent eletp~u,
and are either Incorporated with TN.
other materisis At the time Of the cuo
strucfton or applied later by q surface
treatment,
ln the class Of Temporary btpders
may lie included water. salt soiutious
light oils and tsrx and oil and tar
efnuislons. waste sulpbite liQuorS. etc
while the permanent binders include.
the heavy pefroleums and tars. pi,cbe.
and numerous oil. tar and asphalt prep
srstions- The value Of aaIt solutions
which hsve been used to som. extent
lies 10 the hygro~copic character Of the
dissolved salt. which. IN wing consider
able adbnity for water. Keeps the road
surface IN 4 nois, condition long after
= surface treated with water alone
would have become dry through evspo
RI ton
The light oils sud ,ars n well A. the
oil and tar emulsions delend for their
eject upon comparatively small
VI true binding has. left upon
the road surface after the volatile
products have evapora'ed These ma
tertah prove effective only So long ax
they retain their binding power When
the binding power Is destroyed IL Ia
necessary TO apply more material.
The heavy oils aud tars differ from
the lighter products In that they con
binding base The results are. there
fore. y! = more lasting character and
hence the name ''perma anent binderx.-
The semisolid and solid pr~psrst lions
usually cOt,.alp . SILL greater amount
u hnd~s. With some feW sxcepeioas
sli Of the trUe bindsfs are bisuasaa
IT, ssssi osshnd q a4piytag thsss
fnstesisls 70 The rva0 surfsce s b.
The Temporary bin1ess cas
usually Be- applied cold. but the pes1A.
n~nt bipders because Of their oorh
greater viscosiiy must be heated uatil
nuid in England and
frapre the use Of coal tar Is practiced
to . large extent. aud their methods Of
application have been highly DEVELOPED
Nsc hines are In general use which are
,~lG prop-liing aud In which the tar Ii
bestsd sLd applied TO the road surface
=. n spray under high pressure Tb~ss.
~ called tar srraycrS" sre not only
very - ouvmicai In the use OF tar. bvl
Insure % more even distribution aud
letter penetration OF the road surface
than II d. Ios-ibl. to obtain Ia almost
any other way
ip the con-f rnction Of dusfie~s roa0s
lis- crucial question II that o! cost The
Effort must be- To develop form OF
which will Withstand fast
ut omobiie trufic aud ~ the ~ me- time
i,~ within the financial resources of the
This u largely i-ring t"o~
n present by the u.~ ~ a bitutninosss
binder instead of rork dust The t~o
methods GENERALLY employed srr known
as the psne,ration and the mixing
Geti,ods in the fsmss tb~ bot lIQuti
binder 1. spsinkieh NJ sprayed over fhe
stone ssA allowed TO psssrssts throass