Deseret evening news. [volume] (Great Salt Lake City [Utah]) 1867-1920, 1910-01-27
TR|-STATE HIGHWAY
CONTINUED from page onc.)

cases to import desirable stone. 1t Is
for this grade that there should be q
wide range In the limitations, and yet
the minimum requirements should be
severe enough to shut out a decidedly
inferior stone We should not want Ia
accept a stone that would not give re-
suits OF at least 10 for coefficient OF
wear IA for hardness, 10 for toughncss
and 20 for cementing value,
"A road OF the suggested third grade
could be built of any local stone that
might be obtainable as long as II had
any of the needed qualities of the read
metal The few limitations could be
Just severe enough to shut out any
stone that had weathered badly or had
not shown any merits for use as a
road stone."
These limitations set forth by
MT Greenman amount to fair
ly severe requirements for the first
grade of roads and only the best
grades and most durable rock can 1ul-
I'LL them, but the rough usage that
such a road will be subjected to In
carrying its heavy burden will only
permit of the best metals. The rapid
motion OF vehicles and especially the
rapid locomotion of the vehicles of to-
day, require us to build more substan-
tIaI roads than ever before. The con-
ditions imposed on the stone for second
and third grade roads can be fulfilled
by many lodges of rock In the state
that arc easily accessible.
SELECTION OF MATERIALS.
We can only make intelligent selec-
tions OF rock for our use in the state
OF Utah, after we have experimental
with a great deal of the available
stone II committee of men should
be appointed to gather samples of all
the stone that may be used for
road building and make tests on 1t
and then tabulate their results, long
before the choice OF stone for any
particular road should be made, then
in writing specifications. making estl-
mates. and calling for bids. engineers
and road commissioners would know.
approximately at least, where the de-
sirable grades of rock could be found.
1t seems absurd to make an estimate of
the cost of a road vote the money TO
build 1t, draw up specifications, and
then go out and hunt for rock that
Will fulfill the conditions. In the de-
livery OF steel. or brick. or any manu-
factured product that might be done;
the tests might be made after all is
manufactured and acceptance or re-
lection might be had as a result of the
not go out into the open market and
purchase a stone of a specified coefh-
Client of wear. hardness, toughness, etc.
The engineer is apt to select the kind
of stone and quarry and ask the con-
tractors to bid en- the delivery of that
particular rock.
Having in mind the usefulness of ad-
vance study of the properties contained
by different rock for roadbuildlng. the
University of Utah. and in particular
the testing department of the State
School of Mines, an institution of the
state, began the installation of a road
testing laboratory. During the past two
years. there have been installed stand
ard abrasion cylinders for testing paw
Ing brick and macadam rock. standard
impact testing machines. etc. A rather
preliminary Investigation of many OF
the rocks in the valley was made and
a report of the same was published by
the State School of Mines in its bull
letin- No. .. These tests show a wide
variety of results. OF the limcstones
tested,4 some; pare 9pseless while others
could easily be accepted. There Is
great deal OF difference In the wear
of the same kind OF stone coming from
different quarries only short distances
apart. The results convinced us that
the wise plan would be to spend lit
tie effort now In the studying what we
have In the nature OF valuable road
metals In the different parts OF the
state. so that when we begin to build
long roads into the country districts we
Will make no mistakes In the selection
of our material. There arc limestoncs
sandstones. GRANTEES, shalcs. and igne
Gus rock in great abundance scattered
all over the state-we can set to ard
use them when we Will. Nature has
been liberal in her supply OF rock. We
only must be careful in our selection,
Good road materials Will stimulate
their use. while the discouragemonts
which will follow the unwise use of
poor materials, although good ma
terlals may be at hand, will result in
retarding our progress.
In conclusion / want to say that the
testing of stone for roads can be made
a safeguard against the use of poor
material just the same as the use of
the other engineering materials, and
the engineer who Will accept nothing
short OF materials that will pass the
prescribed tests Will secure a quality
of material that Is bound to be moro
durable and useful No one would
think OF accepting large consignments
of steel rail for the railroad bed with
out knowing what its composition Is
and physical properties.
At the conclusion of Prof Beck
strands address a general discussion
followed. being participated in by Prof.
j. w. Jensen of the Utah Agricultural
college at Logan. Mr. Greenwood of
Utah county. former County Commits
sioner Wilson of Sandy and others.
Prof. Jensen said that he had recently
had occasion TO take up the matter
OF good roads with the farmers of the
northern portion of the state, and upon
making some comparisons between the
use of broken rock, or nacadam ma
terial for road making, and the use of
the earth road, he had found that tho
macadam effected a saving of 10 cents
per ton mile over the earth road. IF
half the families of the state" said
Prof Jensen, ''or 10000. in approximate
numbers, haul 100 tons OF produce five
miles each year, which Is taken to be
very conservative estimate, then tho
saving to the state in one year would
amount TO nearly 100000. And this
amount expended upon the roads OF the
state. would give US many miles of i'm
proved roadways." Tho comparative
cost of maintaining earth roads Is IS
cents per ton mile and for macadam
roads cents pcr ton mile,
CADDB TANNER SPEAKS.
Next on the program was a paper by
Caleb Tanner, state engineer, treating
on the good road bills passed by the last
Legislature. and the benefits the state
would receive by the enforcement of