The Telegraph-courier. [volume] (Kenosha, Wis.) 1888-1946, 1922-01-05
PAVEMENT TEST
TO AID kENOSHA
Local Officials Watch With
Interest Illinois Street
Experiment.
TESTS OUT THEORIES

ing the construction of pavements
that are found to be incapable of re-
sisting modern traffic will soon be car
ried out in the state of Illinois by the
federal and state road engineers.
It is a proposed test which is being
awaited by the city engineer and aid
ermen of this city as we'll as of every
city in the United States as all cities
have met with the same problems in
pavement building which the test is
proposede to solve.
Modern traffic is playing havoc with
the roads of the country and with the
city pavements as well. The immense
weight of motor trucks, passing over
pavements at all rates of speed, has
ruined miles Of pavement. City en-
gineers have sought to meet the re-
quirements of modern traffic, but so
far they have not been very success
full ..v .-.,...... .....s, ....... ~.
City Engineer Brennan is thoroughly
interested in the forthcoming test in
Illinois, and he, together with the
council street committee, may visit the
scene in the near future and gain
better idea Of what the foundation and
general construction Of city pavements
should be.
New Highway to Be Wrecked.
In carrying out the proposed tests
the state Of Illinois and the federal
government jointly, will wreck a
p;ooa Of naua5 rnaJvyax, 4xyo axd n0u
half miles in length. 1t was construct
ed last summer, the work being start
ed in June. The test road is located
twelve miles southwest Of Springfield,
Ill.,, the subgrade soil being uniformly
brown silt loan, with the exception
of two small stretches where it more
nearly approaches gumbo.
There are seven general types of
paving in the road, the idea being to
have represented the chief matrials
used in road making, so that engi-
neers may study the effect of known
and measured traffic of varying de-
grees upon each kind Of pavement. The
seven types follow:
Portland cement concrete.
Monolithic brick surface on a Port
land cement concrete base.
Semi-monolithic brick surface on
Portland cement concrete base.
Lug and lugless brick, bituminous
filled, on portland cement concrete
base. ,. 4.-s RS, s-a.e
Lug and lukless brick, bituminous
filled, on macadam base.
binder course On portland cement con-
crete base.
| Asphaltic concrete with and without
binder course on macadam base.
| Since it's completion the state and
federal government engineers, by nu-
merous daily observations, have been
measuring the effect of heat, cold,
moisture and other elements upon its
surface and on the subgrade. So far
much valuable information has been
secured.
| Truck Traffic as Test.
It is planned to subject the highway
| to a rigidly controlled truck traffic,
the trucks to be weighed and the
weights to be gradually increased from
I
light load to one SO per cent in ex-
cess that allowed by the Illinois laws.
| The number and weight of loads re-
quired to produce failure in the vari-
Gus sections will index the behavior of
the various types when subjected to
different kinds of traf1c. Knowing *he
conditions of traffic that are to be ret
this information will afford a means
by which proper paving can be Sc
lected to meet these conditions.
Why some types of pavement fail
and others hold up will be largely de-
termined by the test. Each series of
pavement in the test roadway beginV
with section roughly estimated to be
equivalent in strength to four inches
of concrete, and increases to the APP
proximate equivalent of nine inches of
concrete.
Effect on the Snbgrade.
| Observations have been made and
are being continued for determining
the bearing power of the subgrade
when subjected to static and impact
loads.
One of the interesting deductions