The Jersey City news. (Jersey City [N.J.]) 1889-1906, 1898-01-14

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Every length of cast iron pipe shall be
tested to a pressure of 200 pounds per
square inch, and under such pressure the
pipe shall be subjected to y series Of
pound hammer.
WROUGHT IRON.
All wrought iron used must be tough,
ductile and fbrous, of uniform quality,
free from crystalline structure, cinders,
flaws or cracks. In bars it must have
an ultimate strength of 0.0e0 pounds per
square inch, with 5000 pounds elastic
limit, and an e%longation of twenty-five
per cent. In eight inches.
Angle iron must ave an ultimate
strength Of 5000 pounds per square inch,
24,O06 pounds elastic limit, with twenty per
cent. elongatfon in eight inches.
STONE MASONRY.
Unless otherwise specified, all stone
masonry is to be built of sound, clean
quarry stone. OF a quality and size sat
isfactory to the Engineer; all joints to be
full of mortar.
Bubble stone masonry shall be made
Of stone Of suitable size. quality n
senting good beds for material Of that
class. Especial care must be taken to
nave the beds ard joints full of mortar,
and no grouting or filing of joints after
The work must be thoroughly bonded.
Where ubble stone masonr is used in
dams the stones must have roughly rec
angular forms, and all irregular projec-
tions and feather edges must be ham
mered off. Their beds especially must be
good and present even surfaces. When
a stone is lowered on the surface pre-
pared to receive it there must be no doubt
that the mortar will fill all spaces. No
spawls shall be inserted beneath a stone
SO placed, but a moderate quantity may
for receiving other stones, if they are
entirely embedded in mortar. Various
sizes of stone must be used and regular
coursings be avoided in order to attain
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Spaces of six inches or more in width be-
tween the stones may be occasionally
filled with concrete carefully rammed.
Masonry which is to receive the shock
OF water and ice, such as on the aprons
OF s~pillways, is to be composed of large
blocks and Is to be especially sound, hard
and compact and of a durable character.
No joint shall be more than one inch
wide The exposed faces of all masonry
dams and gate-chan5ers shall be equal
IN appearance and quality to that of the
Macopin intake dam of the Newark water
works. The facing stone masonry shall
have all beds. builds and joints true to
a depth of not less than three inches, or
more than four inches from the facings,
and the joints shall not exceed one-half
inch in width The rise of the courses
may vary from bottom to top from thirty
inches to fifteen inches, decreasing grad
ually toward the top of the wall, and
the width of the bed of the s~tretchers
is not to be at any point less than TWEEN
ty-eight inches. The headers are to be
not less than four feet in length, each
course to be composed of two stretchers
and one header alternately.
All face Joints shall be raked out to a
depth of one and one-half inches and
carefully pointed with Portland cement
mortar mixed clear.
Granite dimension stone masonry is to
be used for copings of dams and for the
gate openings in the gate-chambers. 1t
must be made of first-clasS granite, free
from seams and other defects. The stones
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angles and ARISES shall be true, we'll de-
fined and sharp. All beds, builds and
joints are to be dressed for the full depth
of the stone to surfaces, allowing of one
quarter inch joint at most. The stone
shall be laid with Quarter-inch joints,
and all face joints shall be pointed with
mortar made of clear Portland cement,
applied before its first setting. All joints
to be raked out to a depth of one and
one-haif inches before pointing.
1t is not intended to compel the use of
quarry stone masonry laid in cement
where dry stone masonry is sufficient, in
the judgment of the Engineer.
MORTAR.
The contractor shall submit samples of
the ingredients and the proportions there
of TO be used in mixing mortar for the
work, to the Engineer, a sufficient time
in advance Of their use, TO permit of suit
able tests being made to determine
whether the mortar so made conforms to
the specifications. If, fer any cause, the
Engineer finds it impossible to make such
tests. then only such ingredients and pro-
portions shall be used as in the opinion
of the Engineer will produce mortar con-
forming to the specifications.
All sand used shall be cIaan and sharp,
free from pebbles.
Mortar used in concrete core-walls Of
earth DAMS, in the foundation and main
body of masonry dams, in the concrete
backing of tunnels, ETC., shall show a
tensile strength of at least twenty-five
pounds per square inch of section at
the end of one week, fifty pounds
per square inch of section at the end
of one month, and 125 pounds at the end
of six months, and may be composed of
one part Rosendale cement and two parts
sand, or such other ingredients or pro-
portions as will produce a mortar of the
above strength.
Mortars used in the brick lining of tun-
neIs, the walls OF gate-chambers, in DIFF
mension stone masonry or concrete in UNI
usually exposed situations shall show a
tensile strength of at least 100 pounds per
square inch of section at the end of one
week, $50 pounds per square inch at the
end of one month, and 250 pounds at the
end of six months, and may be COM
posed of one part Portland cement to two
parts of sand, or such other ingredients
or proportions as will produce a mortar
of the above strength.
Mortars used in pointing shall be com
posed of neat Portland cement. moder-
ately slow setting, and shall show in one
week, after setting two hours in air and
the remainder of the time in water, a
tensile strength of at least $50 pounds per
square inch of section.
When tested in cakes all cement shall
be free from cracking at the edges.
No mortar shall be mixed in advance of
its immediate use, and none shall be used
which has begun to set.
Cement and sand shall be thoroughly
mixed dry, by repeated turns n until
the mass has become homogeneous and
of uniform color. A proper proportion of
water shall then be added and the whole
nIiickly mixed, r
CONCRETE.
The stone shall be broken so that the
greater diameter shall not exceed three
inches. 1t shall be sound n clean. The
stone shall be wet with water and then
thoroughly mixed with the mortar in
such proportions and manner that all
surfaces are covered and all voids filled
parts of stone shall be added to one part
of mortar. All material must be actually
measured in bulk.
Concrete must be Immediately Deposit
ed in the work after mixing and placed
carefully. 1t must not be dropped from a
ers, not exceeding nine 10 inches thick,
and thoroughly rammed until the stone IS
covered with mortar, and until a film of
water appears on the surface. All sur
faces upon which concrete is laid must
he wei before depositing the concrete.
Plank or timber forms must be employed
where necessary to confine the concrete
to the shape and dimensions shown in the
plans.
The best quality of WHOLE, new brick
burned hard entirely through, frae from
Injurious cracks, and with even, true and
smooth faces. with a crushing strength
of 1900 pounds per square inch, must be
used. Every brick must be wet by i'm
mersion before laying and must be laid
A.: I'll v iptrtc on hnt4Av., a;71- -