Keowee courier. [volume] (Pickens Court House, S.C.) 1849-current, 1922-08-23

different concrete sections when sub
tected to traffic equipped with differ
ent types Of wheel, also to furnish q
comparison between actual service
conditions and laboratory tests. This
test will be In operation continuously
beginning some time In June.
impact on Roads Studied.
In q rather elaborate series Of eY-
perlments, tho bureau hos studied Inn
pact Of trucks on roads, and has de-
termined approximately the magnitude
of impact force under different truck
and road conditions. The effect 6f
such impact on concrete pavements
and several types Of road on concrete
base was studied and reported on last
year. \ This series Of experiments is
to be continued and enlarged. Over
12O road sections or slabs have been
constructed In duplicate series One
series is on carefully drained dry
subgrade; the other series is on the
same kind Of subgrade except that It
Is kept wet and as nearly saturated
as possible by means of an underlying
drain tile and side bitches filed with
water
Tho testing Of these slabs will be-
gin some time during the month Of
May and will be by means Of q new
impact machine now being constructed
which Stimulates the action Of the rear
wheel Of truck. On this machine
may be mounted truck wheels ,of differ
ent sizes and weights carrying differ
ent kinds Of truck tires. This ap-
paratus may be so operated as to re-
produce the different loading and
equipment conditions Of large variety
Of trucks. The slabs will be hammered
by means Of this machine in the center,
on the corners, and on the sides so
as to obtain the relative strength un-
der these different conditions.
Subsoil Investigations are being con.
tinued for the purpose Of studying and
Investigating relative stability, mois-
ture condition, and supporting value.
Different methods Of deterIn,uirg tho
bearing value Of soils are also Iolns
studied that Ia. as to whether email
on large areas should be used ln de-
termtnins the ,totlva bearing value.
The warpins eject Of temperature
and moisture conditions on concrete
pavements Is also being investigated
Temperatures and movement are being
recorded graphically on continuous
charts. In addition to these tempern-
ture and movement measurements the
pressures on the subgrade under the
concrete slab are obtained by means
OF soil pressure cells. This investiga-
tion will give some definite information
concerning the support offered by sub
grades to rigid concrete roads. This
investigation has been under way for
some time and will continue probably
for year or more.
The transmission Of loads THROUGH
different types Of pavements to the
subgradc is being investigated by
means Of soil pressure cells placed on
the subgrade under the pavements.
This test will also serve to show the
relative support offered to brick and
other types Of block pavement by con-
crete bases and broken stone bases.
This Investigation has been under way
for about one year and will continue
for some time to come.
A large number Of prominent engi.
neers and others interested In road
work have visited the Arlington Tx.
perlmental station to witness the prep
aration and conduct Of these expert.
ments. It is intended to have oil these
projects In full operation by the mid
die of juno. Visitors are always vel.
come and those in charge OF the work
are always glad to give any informa.
tion desired about the experiments.