Evening star. [volume] (Washington, D.C.) 1854-1972, 1914-12-07

Bitumlnous '' concrete. stone 49,
Cement concrete. .............. 2s,s65 1.6s
Granite and rubble. ........... 4ee.9s0 1858
Vitrihed block. ............... 25,535 1.34
siacadam iestimatedJ. 800. 1,ss9,eoo 12212
Cutters on asphalt streets. 2o4,5i7 ......
Cutters on bituminous con-
crete streets. 9,575
Pavements maintained by
street railroads. ............. b56,75
Total .....................6 ,s4s. 1898 5oOs7
| 1872 miles rated as second-class macadam.
Municipal Asphalt Plant.
| The portable municipal asphalt plant,
| which was authorized to be purchased
| and operated in the appropriation acts
for the fiscal years 1913 and 1914, was
| operated during the year. with re-
| suits in compliance with the require
| ment of law that the work done should
be economically performed as compared
| with similar work previously done I'M
der contract. Under the law this plant
| is operated under the immediate direc-
ton OF the Commissioners In doing
such work of resurfacing and repairs
to asphalt pavements, and In the repair
! Of macadam streets by constructing
asphalt macadam wearing surface, as
| in the judgment of the Commissioners
may be economically performed by the
! use OIL the pant, OUT the COMMISSIONERS
are prohibited from doing more work
Of resurfacing and repairs than can be
accomplished with this one plant.
The total output of the plant during
| the year was 172.12S cubic feet A
large portion of this output was OBJ
| tanned from the use Of suitable old
surface material removed from streets
being resurfaced, to which new as
phaltfc cement and other material were
added. The cost of crushing this old
n M ir
yard. or about 4 cents per cubic foot.
Included in this figure was suitable
allowance for interest on the invest
ment. maintenance and 20 per cent OBJ
solescence. The plant was in operation
232 working days. the average daily
output being TAP cubic feet. The cost
of operation of plant, hauling ma
| terial to the streets. cutting out the
the new pavement. including fuel
charges both at the plant and on the
street, averaged 21.S cents per cubic
foot. OF this cost, cents represents
| represents haul to the street and 13
cents represents placing the material
on the street. The overhead charges
were the cost of supervision. 81 cents
interest on the investment and 20 per
cent obsolescence, making a total on
this account of 1.6 cents per cubic
foot: The sharpening of tools aver
aged one.half cent per cubic foot. The
total Of these charges. constituting the
cost of the plant output, exclusive of
material, was ga cents per cubic foot.
By adding to the above charges the
various material costs of the different
mixtures, the cost of the work on the
street was as follows: Top mixture.
using Bermudez cement, 474 cents per
cubic foot, as compared with the price
of 81 cents per cubic foot: binder, 1872
cents per cubic foot, as compared with
contract nf
foot.
The clements of rental value of site of
plant, taxes and contractors profit are
not considered in these costs
The operation of this plant has
demonstrated its economy as n small
plant, but it is less economical than
larger permanent plant would be-
The work of repairing asphalt pave
ments, except where the roadway is en-
tirely resurfaced. is done by the use Of
this plant instead Of by contract
Suburban Streets and Roads.
The work done under this heading
during the year was as follows:
Construction OF suburban roads. $154. $50
REPAIRS to suburban roads. 10000
Grading streets, alleys and roads,. 1000
Constructing quarry road entrance to the
Zooiogcal fark .........-......... $1,000
Total Observation-Disclosures. s376, $50
A considerable quantity of cement
roadway was laid on suburban streets,
the paving consisting of a cement
base six inches thick, covered with a
thin surface coat of tar. This class of
pavement Is proving very satisfactory,
and Is being constructed at much less
cost than sheet asphalt or asphaltic
concrete on cement base. The resultant
roadway surface is more easily kept
in repair than a macadam roadway. It
is intended during the coming year to
reduce the base of this pavement to
five inches in thickness, but to use a
richer mixture.
on concrete base and on a macadam
base was continued, as this class of
work appears to be the best suited to
heavy suburban traffic.
Approximately S30.045 was expended
for oiling and tarring suburban road
ways, and S2,344 was expended for
sprinkling roads which could not be
oiled.
At the close of the fiscal year the
mileage of improved roads and streets
the city Of Washington. but not in
Guiding those paved with granite
block, sheet asphalt or asphalt block,
was as follows:
Bituminous concrete roadway 3.75
Bituminous macadam roadway. 4.36
cement roadway ...-................... $50
Macadam roadway ..................... 109. %
Gravel roadway OBSERVATION-DISCLOSURES. 1855
Total Observation-Disclosures. 36s.s7
Sidewalks and Alleys.
The sum of $22o, 900 was expended for
paving sidewalks and alleys, and the
sum of $4,000 for sidewalks and curbs
around government reservations and
government buildings. OF the first
named amount one-half of the cost is
ossacsod oOoipct private property No
assessment is made for the work adj
jacent to government parks and build
ings. The sidewalks are constructed
of cement. under contract, and the al
leys are paved with vitrffled or asphalt
block the work being done by day