Smyrna times., 1929-03-13
.nIIIG PROBLEM Of KEEPING. KEEPING
II|II1PFN N AND CONSTRUCTING

STANDARD PRACTICE
pDDS MUST CURE FOR 2 DAYS
r.,Iv strength" Concrete VIII
sS EarIG !. The Opening in Twenty
PERM, Tnnr d FOrty-Eight Hours
,.,,rsss in the art of read building
\. development Of "high early
u " concrete combine to eliml-
i the most vexing and cost
4 u sl.ms confronting the motoring
n Pl'', secording to William S. Can
Flls sragineering Director Of the a.
naloware Automobile Assocla-
\ ~ g md West streets, Whining
b. ~ y. Canning has just completed
n u, Il the newest methods Of
q saG EiSbway i construction, and his
y Il That motor traffic IN
r'ilsUn l.,nria. j New Jersey and Della
iT benefit immeasurably thru
d ,lI,e vi os5lft IF the practices now past
l aylpsrimental stage.
~ i the greatest problems Of
VI jls,~av i enginee-," said Mr.. Can
p saas been to provide means for
,ant l1s Of traffic while road con
Isasn asa I under way. Of course,
'loI ..ablam vas simplified in sec
l5oro adequate detours were
nv There we're, and are, how
!. ilTlsl msnv places where detours are
.Iistant % Of impractical. In such
-,tans The necessity for quick con
.aDn I outweighs all other consider
-'r Under the standard practice
\ ..,ste construction, the completed
mrst be permitted to cure for
i.d If from sixteen to twenty
'i.'r jars before it is ready for traf-
I'll. insures permanency Of the
y, and there IS no disposition On
.s .srt IF highway engineers to de-
I'll i,om the practice under ordin-
anditions. Emergencies call for
III. 4roa+ment. and high early
.,Tfb, concrete has been developed
IN he engineering demand for a
...isI that will permit the opening
: rsd in twenty-four to forty
bours instead of the usual two
s,s weeks. The Pennsylvania De
--srt of Highways has recently
A, new material to a severe test
4, construction Of paving in the
meek at Harrisburg. Traffic
nRns suburban to Harrisburg as
from the counties Of Cumber-
York. Adams and Franklin is
lsisd TO use a single short sec
K highway just west of the Sus-
anna River to reach the Capital.
\ are no parallel routes or detours
b5Ie Recently a traffic count
Nd maximum hourly movement
300 motor vehicles, with a daily
Of $4,000. Facing the problems
LssDing the road open and con
tirg the new highway at the
time, the highway engineers
nigh early strength concrete
id the pavement in half widths
& excavation progressed, throw
open to all traffic within twenty
hsurs after it was laid. Accord |
d the States tests, the new paw
j practically every instance, had
at strength in twenty-four
to carry the heaviest trucks
tied by law in Pennsylvania with
sguate safety factor, despite ex-
b adverse temperature condi-
/ was one Of the outstanding |
1ishments Of The Department Of |
sys for the year. The Bottle
Improvement is regarded as hav-
hInished more relief to traffic
xion than any project Of double
u Aside from the quick open
I the highway, the project was
7rhy because Of the other diff |
ss surmounted. 1t was neces-
the widening of the road, to /
z four lanes for traffic, to exea-
s0OO cubic yard of solid rock
saO yards Of earth and shale;
2 the railroad overhead structure
EOeate the trolley tracks that
the highway. The total cost
work was 100000. There is
mysterious about the high
Strength product. Briefly, it is
Aanent Of Portland Cement, and
aacty for reaching high strength
The usual curing period is
the refining process, which
y more costly than ordinary
Comparative figures on costs
.a' NE pavement averages only
2 70 Is per cent more tban the
z cement. Wherever traffic
-.ls make its use imperative,
4 i more than counterbalanced |
convenience and savings IN
afected1
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