The Cairo bulletin., 1910-04-20

curve or arc of the top surface OF
the finished pavement. The combi.
nation curb and gutter shall be con-
structed with joints eight (S) feet
apart in the following described man.
ner: said concrete Is to be prepared
from washed. river gravel, sand and
Portland cement and shall consist OF
two 90 courses. The first course
shall be the bottom course ana shall
be five 90 inches in depth and shall
be laid on eight 90 inches Of clean
cinders thoroughly moistened and
tamDed to conform to the out inc 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
Cd inch in depth,
\ The bottom course shall be com
posed of one ~ part of Portland
cement and five 60 parts of washed,
, river gravel Of sizes ranging from
/ gravel Of two t2) 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. yoids, and the
same shall be entirely free from
! mud, dirt, dust and loan. The gravel
and cement used in constructing this
: bottom course shall first be thor
oughly mixed dry and sufficient clean
a water shall then be added by slowly
/ sprinkling to give the mixture the
4 proper consistency and the whole
} shall be constantly stirred until the
e same is thoroughly mixed
f This mess shall be spread in forms
e upon the cinder foundation ana shall
4 be rammed until all interstices are
o thoroughly filed with the mortar,
y particular care being taken that this
n bottom course Is well rammed and
/ consolidated along the outer edges.
}. After this bottom course is com
Q pleted and before it has had time to
} begin to set. the finishing or wear.
s ing course shall be added The fin
> ishing course shall consist OF d stiff
\ mortar composed Of one "a part Of
u ! Vi tiiLu IGIittHi Olf sltAu OlAC-AdiI
4 (1h) parts Of clean. sharp coarse
sand and shah be laid to the depth
s OF one "a inch and shall be care
J fully smoothed TO an even surface.
which, after the first setting takes
l. place, must not be disturbed by ad-
1 dtional rubbing.
G The curb and gutter shall be pro-
e tected from the sun and wind for
6 twenty-four (24) hours after the com
petions during which time it shall be
kept moist by sprinkling.
Al The tops or upper edges OF the said
, curbing on both sides OF said pave
ment shall be, when finished COM
+ plete, throughout Its entire length,
, one inch below the grade here.
matter specified for the center line OF
! the said brick pavement when the
same has been completed.
Concrete Foundation.
( eaction 8. Upon the said sub-grade
s and lrel earth surface, so prepared
, and shaped az aforesaid, shall be laid
\ or spread a foundation Of Portland
/ cement concrete, Of the uniform
o thickness Of five t5) Inches, conn
i posed of one % part of Portland
cement and eight (S) parts of
? washed river gravel of sizes ranging
i from gravel Of two (2D inches in
r diameter down to coarse sand, and
the same shall lie graded SO that the
! gravel and sand shall not contain
, more than twenty 900 per cent.
voitls. and the same shall be entire
iEly free from mud dirt, dust and loam
and shall be screened when neces-
sary. The gravel and cement shall
/ be thoroughly mixed dry and snf-
! flcient clean water shall then be slow
! iy added to give the mixture the
, proper consistency and the same
q shall be thoroughly worked over with
> hoes. The concrete shall then be
! turned and mixed until each piece of
I 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 rammng 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 a
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-
! mitted. and any concrete In which the
= cement has begun to set shall be re-
4 iected.
Section o. An concrete to be used
!, in the work provided for by this or
dinance may be mixed with suitable
. concrete mixing machine, but no such
machine shah be used In mixing such
iconcrete 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 10. Upon the foundation