Oxford Democrat. [volume] (Paris, Me.) 1833-1933, 1897-08-03
GOVERNMENT RoAoMAKINo.


Wesk q ConstSuetioa Supplemented ~
Lectures by IN Expert.
Several weeks ago the department Of
agriculture began its first experiment
In roadbuilding at New Brunswick,
N. j., under the direction Of Z. b.
Harrison. special agent Of the Office Of
road inquiry.
The model road being considered IL
the first Of several which the govern
ment is to build at the various expert
ment stations throughout the country.
The government furnishes rock crush
er, screen, engine TO drive steam roller.
spreading wagon and road grading ma
chine and two skilled operators. The
city furnishes the material, carts and
laborers
The road will be Of macadam pattern.
An inferior grade Of traprock is found
in abundance near New Brunswick and
this is being used in the substructnre
Of the road The superstructure IL OBJ
tanned from the traprock deposits in
the neighborhocd Of Plainfeld and the
Oranges.
The model pavement will have q
depth of about nine inches and the foun-
dation be made of small, wedge shaped,
broken stones Of as nearly the same di-
mensions as possible. The roadbed will
be prepared by thoroughly rolling with
steam roller weighing about ten tons.
Every hole will be carefully filled with
the same material that oomposes the
rest Of the roadbed. and the finished
cross section will be formed by two
grades OF one foot in 80 feet from the
sides, uniting at the center, with the
apex slightly rounded. Four inches OF
crushed stone will be spread on the
carefully prepared roadbed to form the
foundation Cf the substructure. The
largest of these stones will be crushed
so fine as TO be able to easily pass
through two inch ring, and the small.
est will be about half an inch in diam
eter.
This foundation will then be sprin-
kled, making he stone as wet as posi-
bic withou, softeDing the roadbed. and
the roller yassed over it few times
until the stoue is only slightly disturbed
by the teams returning with the empty
carts. The first foundation is not made
deeper than four inches, because 1t has
been found that greater thickness
causes the stores to elbow" together,
wearing of their sharp corners, making
the bonding" which is the great de-
sideratum, % very slow process, II not
an impossibility.
When the first foundation has been
thoroughly sprinkled, second coat OF
similar stone three inches in thickness
will lie applied. After the stone has
been well bonded" to this extent il will
again be sprinkled. and while very wet
thin coating Of traprock screenings
will be most carefully spread over the
surface, just thick enough to fill the
small spaces between the stones. The
size of the stones Of this last applica.
ton, which is called in the parlaDce OF
roadbuilding the binder" will be
from half IN inch III diameter to the
finest dust. When the work has reached
this stage. it will be left untouched in
the dry state as long Us practicable to
harden ard bind. The application OF
water and the passage Of vehicles will
10 prevented rs long as practicable.
AS the work progresses Mr.. L. b.
Harrison, who is directing the work for
the department. Of agriculture, will de-
liver lectures explaining The process OF
laying the road. Rutgers college stu
dents in the agricultural department
and farmers will be invited TO attend
the lectures and witness the work.