Pullman herald. [volume] (Pullman, W.T. [Wash.]) 1888-1989, 1921-08-19
I2.-DIYISIoN PLATES

l2.-DIVISIoN PLATES:
suitable division plates shall be
provided to completely separate adj
1acent slabs during construction nm
less otherwise permitted by the en-
gineer.
13.-TREATMENT;
All wood forms shall be thorough
ly wetted and metal forms oiled or
coated with soft soap or whitewasb
before depositing any material
against them. All mortar and dirt
shall be removed from forms that
have been previously used.
Construction
14.-S1ZE OF SLABS:
The cement sidewalk shall he mt
down in slabs twelve G2) feet in
length and vary in width as to bust
ness or residence district of the city.
| Sidewalks shall be five (5) feet in
/ wldth except when otherwise order
ed by the city engineer
The standard markings for side
walks shall be in rectangles two and
one-half q 12) feet by three go
feet, unless otherwise ordered.
15.-THICKNESS OF WALK
The thickness OF the walk shall be
not less than four (4) inches. For
/ driveways the thickness shall be not
less than six co inches
| 16,-JOINTS:
A one-half (12) inch joint shall
De provided every twelve (12) feet
in length of the walk which shall he
Illied with suitable material as speci-
lied under Joint Filler" A sim
liar Joint shall be provided at each
intersection of sidewalk and street
curb and at such other points as NAV
be designated by the engineer. Side
walks in the business district shall
be separated from abutting build
ings by one-half (R) inch Joint.
17.-PROTECTION OF EDGES:
The upper edges of the slab shall
be rounded to a radius of one-half
/ " inch.
Measuring and Mixing
18.-MEASURING:
The method of measuring the ma
terials for the concrete or mortar,
including water, shall be one which
Will insure separate and uniform
proportions of each of the materials
at all times. A sack of Portland ce-
ment GA pounds metz shall be CON
sidered one CD cubic foot.
l9.-MACHINE MIXING:
All concrete shall be mixed by
machine except when engineer shall
otherwise permit under special con-
ditions. A batch mixer of any APP
proved type shall he used The in
gradients Of the concrete or mortar
shall be mixed to the specified con-
sistency and the mixing shall be
continued for at least one Cd min
ute after all materials are in the
drum. The drum shall be complete
ly emptied before receiving material
for the succeeding batch.
| 20.-HAND MIXING:
When it is necessary to mix by
hand the materials shall be mixed
dry on a water tight platform until
the mixture is of uniform color, the
required amount OF water added, and
the mixing continued until the mass
is of uniform consistency and char
acter throughout.
I21.-RETEMPERING;
Retempering of mortar or concrete
which has partially hardened, that
is, remixing with or without addi-
tional materials or water, shall not
be permitted.
Protection
22.-TREATMENT;
AS soon as the finished walk has
hardened sufficiently to prevent
. damage the surface of the walk
shall be sprinkled with clean water
or preferably covered with at least
one % inch of wet sand or earth
and kept wet for at least seven days.
23.-PROTECTION:
The freshly finished walk shall be
protected from hot sun and drying
winds until it can be sprinkled and
covered as above specified. The con-
crete surface must not be damaged
or pitted by rain drops, and the con-
f tractor shall provide and use when
necessary sufficient tarpaulins to
I completely cover all sections that
, have been placed within the proceed
} ing twelve G2) hours. The con-
, tractor shall erect and maintain suit
able barriers to protect the walk
from traffic and any section dam
aged from traffic or other causes,
occurring prior to its official accept
2 ance, shall be repaired or replaced
| by the contractor at his own expense
! in a manner satisfactory to the en-
S gineer. Before the sidewalk is open
= ed to traffic the covering shall be re-
= moved and disposed of by the con-
D tractor The walk shall not be open
/ to traffic until the engineer directs
24.-TEMPERATURE BELOW 30
DEGREES FAHRENHEIT:
If at any time during the progress
of the work the temperature is, or
in the opinion of the engineer Will
e within twenty-four GA hours drop
, to IS degrees Fahrenheit the water
=, and aggregates shall be heated and
l precautions taken to protect the
work from freezing for at least 1--WE
: CD days
25.-NAME STAMP:
hall ,oply the