The Jersey City news., 1898-07-30

Mortars used in pointing shall be COM
posed Of neat Portland cement, moder-
afely slow setting. and shall show n one
week. after setting two hours In air ana
the remainder Of the time in water, a
tensile strength of at least $50 pounds per
sct--.e inch Of section.
When tested in cakes all cement shall
be free from cracking at the edges.
No mortar shall be mixed In advance or
It's immediate use, and none shall be USED
which has begun TO set.
cement and sand shall be thorougnly
mixed dry, by repeated turns and until
the mass has become homogeneous and
of uniform color. A proper proportion OF
water shall then be added and the whole
quickly mixed.
CONCRETE.
The stone shall be broken so that the
greater diameter shall not exceed three
inches 1t shall be sound and clean. The
stone shall be wet with water and then
thoroughly mixed with the mortar in
such proportions and manner that all
with mortar, but not more than three
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. It must not be dropped from a
height. 1t shall be laid in horizontal lay
ers, not exceeding nine (9) inches thick.
and thoroughly rammed until the stone is
covered with mortar, and until a film of
water appears on the surface. All sur
races upon Whlch concrete IS laiQ must
be wet 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, free from
injurious cracks, and with even, true and
smooth faces, with crushing strength
of 1000 pounds per square inch, must be
used. Every brick must be wet by i'm
mersion before laying and must be laid
in full mortar joints on bottom, sides and
ends, not exceeding three-eighths of an
inch thick. All brick work shall be prop
erly bonded.
The top soil and all vegetable matter
shall be removed from the area to pc
covered by earth dams. This area shali
be cleared to the satisfaction OF the En-
gineer, and the material removed there
from, which is sufficiently free from veg
etable matter may afterwards be used
for building the outer toe of the DAM
A concrete core-wal of a proper thick
ness shall extend the entire length Of the
dam and from the high water level dowr
into the material underlying the EN-
bankment to sound rock or some othel
impervious material.
The earth used in the embankment shall
be carefully selected of the best mate
rfals mixed, if necessary TO secure I'M n
nervousness to water. The earth Shal
be spread upon the embankment in leVe
/ layers not exceeding six inches In THICK
ness, and narrowed, wet down and rolled
so as to be thoroughly compact.
The slopes of embanknent snail not OF
sleeper than one foot rise to two-foo
base; they shall be finished true ane
smooth and protected on the water side
with suitable paving, and on the other sid'
either by paving or by dressing, with si1
inches of soil, and sodding or seeding
with grass seed acceptable to the Engi
neer.
When the work is completed, all gate
chambers, gatehouses, effluent pipes o.
| culverts, conduits and tunnels shall o'
carefully cleaned out. The surrounding
grounds. the reservoir lands and rights o
way shall be cleared of all rubbish ant
temporary structures and left in nea
and presentable condition.