The Cairo bulletin., 1909-07-26

tamped TO conform to the outline Of
the form for the combined curb and
gutter. The second course shall be
the finishing or wearing course or
surface and the same shall be one Q)
inch in depth.
The bottom courss snail be com
posed of one C) part of Portland
cement and five 60 parts of washed
river gravel of sizes ranging from
gravel of two CD inches in diameter
down to coarse sand, and the same
shall be graded so that the gravel and
sand shall not contain more than
twenty (20) per cent. voids and the
same shall be entirely free from
!, mud, dirt, dust ana loan. The gravel
i. and cement used in constructing this
bottom course shall first be thor
oughly mixeI dry and sufficient clean
water shall then be added by slowly
, sprinkling to give the mixture the
. proper consistency and the whole
shall be constantly stirred until the
| same is thoroughly mixed.
This mass shall be spread in forms
] upon the cinder foundation and shall
be rammed until all interstices are
: thoroughly filled with the mortar,
particular care being taken that this
bottom course is well rammed and
consolidated along the outer edges.
After this bottom course is com
pleted aud before II has had time to
begin to set, the finishing or wear
ing course shall be aided, The fin
ishing course shall consist Of stiff
mortar composed of one tD part of
Portland cement and one and one-half
Gh) parts of clean, sharp, coarse
sand and shall be laid to the depth
Of one ID inch and shall be care
fully smoothed to an even surface
which, after the first setting takes
place, must not be disturbed by adj
ditional rubbing.
The curb and gutter shall be pro-
tected from the sun and wind for
, twenty-four (2D hours after the com
pletion during which time it shah be
kept moist by sprinkling.
The tops or upper edges of the said
icurbing on both sides or said pave
ment shall be, when finished complete
throughout its entire length, one inch
below the grade hereinafter specified
for the center line or the said brick
pavement when the same has been
completed.
Concrete Foundation.
Section s. Upon the said sub-grade
ard firm earth surface, so prepared
and shaped as aforesaid, shall be laid
or spread foundation of Portland
cement concrete, Of the uniform
thickness of five 60 inches, COM
posed of one (1) part of Portland
cement and eight (S) parts of
washed, river gravel of sizes ranging
from gravel of two f2) inches in
diameter down to coarse sand, and
the same shall he graded so that the
gravel and sand shall not contain
more than twenty (20l per cent.
voids, ana the same shall be entire
ly free from mud, dirt dust and loan
and shall be screened when neces.
sary The gravel and cement shall
be thoroughly mixed dry and suf-
fcent clean water shall then be Slow.
ly added to give the mixture the
proper consistency and the same
shall be thoroughly worked over with
hoes The concrete shall then be
turned and mixed until each piece OF
gravel is thoroughly covered with
mortar
The concrete thus prepared Shall
be Immediately placed in the work.
and be spread and thoroughly com
pacted by rammine until free NOR.
tar appears on the surface. The
whole operation of mixing and laying
each batch of concrete shall be done
| as eXpeditiously as possible with
sufficient number Of skilled men. and
must be entirely completed before the
cement has begun to set No re-
tempering Of concrete shall be per
mittod, and any concrete in which the
cement has begun to set shall be re-
! iected.
Section 9. All concrete TO be used
in the work provided for by this or.
dinance may be mixed with "A suitable
concrete mixing machine but no such
machine shall be used in mixing such
concrete until the machine TO BE-
used In mixing such concrete shall
have been first approved by the
Board Of Local improvements of the
said City Of Cairo.
Sand Cushion.
Section 1o Upon the foundation
thus prepared, as above required.
shall be spread layer of clean sand
'of tlo uniform thickness Of two C2)
inches; and upon this sand. as a cush-
ion, shall be laid the paving brick
The Bricks.
Section II. The bricks shall be
straight. regular in SIZE and shape, |
and free from flaws and cracks. They |
shall not be less than 2hx4xS nor
more than 3hxfx9 incnes. They shall |
be expressly made for paving purpos- |
es and shall be hard and tough ana
thoroughly vitTified. and must not alb |