Askov American. [volume] (Askov, Pine County, Minn.) 1914-current, 1916-02-24
BUILDING A SECTION OF CHEVY CHASE
ROAD.

BUILDING SECTION OF CHEVY CHASE
ROAD.
dretls OF practical road builders from
all parts Of the country have inspected
IL from time to time and have mar
veled 1t the excellence OF the work.
Manufacturers who have supplied
bitnmiuous materials for the treat
meit of the road have detached their
special experts for this scrvire, and
the traffic over the road has demon
strated under carefully observed con
ditions the relative value of the several
types OF road making up this great
highway,
The Chevy Chase road is experiment
nj Ii consists of different types OF
pavement --bituminous macadam laid
by the penetration method, surface
treatments OF waterbound macadam.
aspialtic surfaces on concrete founda
tions. hituminous surfaced concrete,
plain and oil cement concrete anlt Wit
rifed brick. all of which are under
daily observation by expert road build
ers to ascertain which OF the types Is
best suited to the traffic and which Is
condemned by practical test under the
same conditions Of climate, soil, rain
fall, heat and cold aud like traffic re
quirements. 1t would be just the same
to the office OF public roads which has
written this open book In concrete
brick and stone whether any part OF
ID or all parts OF 1t should fail. fail
In materials used, in construction. In
durability, In cost. In maintenance.
Road building Is science now, and
efficiency is the only test Of quality.
In the stones used I'm the construction
of the Chevy Chase road, their specific
gravity. their weight per cubic foot,
their water absorption. their percent
age of wear, their hardness and tough
ness are all determined by the most
careful scientific tests, ratrolmeu are
constantly employed on this road to
keep account OF whatever defects in
materials aud construction may devel
OPP aud exact data as To the cost of
maintenance.
In one of the experiments covering
t.5Si square yards the cost per square
yard for two and one-half inch btu
minous wearing surface was 46,lS
cents. This experiment. was made In
1911. For the maintenance OF surface
there was no expense In the following
two years. but i'm 1914 this expense
was STa,1u.
Tn another section Of the road the
cost per square yard for two aud one
half-aach hiiuminous wearing surface
WAS t+.4a cents and for supplementary
construction 1870 cents. This expert.
ment covered an area OF 100 square
yards. and In the three years from 1912
to 1914 Inclusive there was no expense
for maintenance,
All surfaces on this road were built
of uniform thickness OF eight inches
and of total width of nineteen feet
In size from one To three Inches. spread
to depth of five inches. the voids be
ing filed with screenings, The wear
ing course consisted of stone ranging
from one TO two inches generally, and
upon this course the hitamen was an
piled In two applications of approx.
| mately one and one-half TO one-half
gallon respectively. The cost of the
stone used In the foundation and wear,
ing courses varied according to the ex
nense of anarrytng and delivery. as 1t
would vary at all ether points. and Of
all the materials of construction and
charges fer maintenance exact account
has been kept,