St. Johns review. (Saint Johns, Or.) 1904-current, 1912-03-15
ORDINANCE NO. 463
An Ordinance Regulating the
Improvement of Streets in
the City of st. Johns, by
Hard Surfacing With Con-
crete Pavement.

improved by hard surfacing with con
crete pavement, the same shall be done
in the following manner:
GRADING.
The space over which the concrete is
to be laid will be excavated TO the prop
er depth as designated by the city engi-
neer, and thoroughly compacted by roll.
ing with a road roller weighing not less
than 10 tons. Care must be taken to
preserve the proper crown. All soft and
spongy places not ahording firm foun-
dation shall be dug out and refilled with
good earth, gravel or nacadam, well
rammed in place.
All embankments shall, whenever so
required by the city engineer, be built
In horizontal layers or courses of not
more than one foot in thickness for the
full width of embankment, and each
layer rolled in turn to the satisfaction of
the city engineer.
Rolling shall be completed in sections
OF at least one block, and shall be tested
and accepted by the city engineer, or In.
spector in writing before any of paving
material is placed thereon.
THICKNESS OF PAVEMENT.
Upon the subgrade prepared as above
specified shall be placed a layer OF con.
crete not less than six (6) inches thick
from subgrade to top surface after being
thoroughly rammed and compacted.
CONCRETE.
Mixing and Laying.
One part OF cement aud three parts of
sand shall be thoroughly mixed dry aud
made into mortar with the least possible
amount of water; to this will be added
five parts Of broken stone thoroughly
drenched with water. but containing no
loose water in the keep, aud whole shall
be thoroughly mixed until the aggregate
is completely covered with mortcr. Ma
chine mixed concrete equal TO the above
will be accepted.
The stone aud mortar are TO be meas
ured mot estimated) in the given pro
portions aud mixed In a proper box or
on water tight platform according To
the direction OF the city engineer, aud in
no case are they 90 he mixed on the
ground. II shall then be spread at once
aud thoroughly compacted by ramming
until free mortar appears on the surface
and no rock or gravel stones are visible
on the top surface.
The upper surface OF the concrete
shall exactly conform with the finished
crown Of the street aud shall be struck
with template " necessary. The NOR
tar aud concrete shall not be mixed la
greater quantities than Is required for
immediate use, aud none remaining un.
used until set shall be rcmixed or in any
way used again.
All surfaces or against which concrete
Is to be laid shall be thoroughly cleaned
and dampened by sprinkling with water
just previous 10 placing the concrete. In
the mineral aggregate one sack OF ce-
ment shall be taken as one (l cubic
foot, and one (I) barrel as four (A) cubic
feet.
ROCK.
The rock for making the concrete
shall be the best dark coiored sound ba-
salt rock, or granite broken In pieces not
larger than two inches In the largest di-
amcter nor smaller than ne-ioufth Of AN
inch In diameter. The broken rock
shall be screened 80 that all dust, clay,
loan or vegetable matter and pieces
smaller than one-quaTter inch in diane
ter shall be removed. The rock shall De
thoroughly washed, II considered neces.
sary by the city engineer.
SAND.
All sand must be clean, coarse aud
sharp, Il must range uniformly from ine
10 coarse. All must pass a sieve having
ne-iourth inch mesh aud not more than
ten per cent must pass 90 mesh sieve.
CEMENT.
The cement shall be a Portland ce-
men, OF approved brand free from hard
humps aud all foreign matter. II shall
be delivered ON the work In the original
packages in good condition, labeled
properly and must be well protected
from rain aud dampness The engineer
shall at all times have access 10 all ce-
ments for the purpose Of testing at least
10 days before being used, aud the rngi-
neer shall be notified that such Is ayaila-
BILE 10 days in advance OF use.
TESTS.
| Pineness.
II shall leave by weight residue of
not more than \ per cent ON the No. 100
screen, and not more than IS per cent on
the 400 screen,
Time of Setting,
Il shall develop initial set ia not less
than 80 minutes, and must develop hard
set in not more than 10 hours.
Tensile Strengths
a hours in moist air, I7S pounds per
square inch.
One day in moist air, days in water.
500 pounds per square inch,
One day IN moist air, AZ daysin water,
600 pounds per square inch.
I;5 Mortar.
One day in moist air, o days in water,
400 pounds per square inch,
One day IN moist air. AZ days IN water,
ais pounds per square inch.
In addition To above tests all cement
shall be subject to any other tests that
the engineer shall deem necessary tO de-
temine whether the cement is OF a suit
able character.
Tor FINISH.
After the concrete is in place and thor
oughly rammed, the upper surface con
forming with the exact crown of the
street and no pieces of rock being visible
the entire surface shall be roughened by
brooming same with wire broom. All
brooming shall be done before set.
EXPANSION JOINTS.
At intervals OF as feet, or as the engi-
neer shall direct, shall be placed AN ex-
pansion Joint made as follows: A header
shall be placed at right angles to the
center line OF the street, behind which
shall be placed double thickness of tar
building paper. When the cement has
set enough to stand the header shall be
removed, leaving the paper and the adj
joining concrete butted against il. Care
must be taken to keepthe joint in straight
line. One OF these Joints shall be placed
at the end of each days run.
The contractor shall barricade all work
for period of at least eight days after
its completion, and shall in warm
weather keep all concrete damp during