The Cairo bulletin., 1910-04-02


from washed, river gravel, sand and |
Portland cement and shall consist of |
two ca courses. The first course
shall be the bottom course and shall |
be five 90 inches in depth and shall |
be laid on eight (S) inches of clean
cinders thoroughly moistened and
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
"a inch in depth
The bottom course shall be com
posed Of one a. part of Portland
cement and five (5) parts of washed,
river gravel of sizes ranging from
gravel of two (2) inches In diameter
down to coarse sand, and the same
shall be graded so that the grave! and
sand shall not cantain more than
twenty (20) per cent. voids, and the
same shah be entirely free from
mud, dirt, dust and loan. The gravel
and cement used in constructing its
bottom course shall first be thor
oughly mixed 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 interstiees are
| thoroughly filed with the mortar,
particular care being taken that this
bottom course is we'll rammed and
consolidated along the outer edges.
| After this bottom course is COM
pleted and before 1t has had time to
| begin to set, the finishing or wear
| ing course shall be added The fin
ishing course shall consist of stiff
motar composed of one 1) part or
Portland cement ana one and one-half
| az parts of clean, sharp, coarse
sand and shall be laid to the depth
of one (1) inch and shall be care
fully smoothed to an even surface,
which, after the first setting takes
place, must not be disturbed by ad.
ditional rubbing.
The curb and gutter shall be pro-
| teeted from the sun and wind for
ltwenty-four t24) hours after the com
pletion, during which time it shall be
kept moist by sprinkling.
The tops or upper edges of the said
curbing on both sides of said pave
lments shall be. when finished com
plete, throughout its entire length
three co inches below the grade here
| matter specified for the center line Of
the said brick pavement when tht
same has been completed,
i Concrete Foundation.
| Section s. Upon the said sub.grad'
and firm earth surface, so prepared
and shape as aforesaid. shall be lai'
or spread foundation of Portlan,
cement concrete, of the uniform
thickness of five 81 inches, con
posed of one U)A part of Portan
cement and eight (S) parts o
washed, river gravel of sizes ranging
from gravel of two (2) inches il
diameter down to coarse sand, an
the same shall be graded so that thu
gravel and sand shall not contain
more than twenty 600 per cent
voids, and 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 sui
fieient clean water shan then be slow
ly added to give the mixture tn
proper consistency and the sam
shall be thoroughly worked over witt
hoes. The concrete shall then b.
turned and mixed until each piece o
gravel is thoroughly covered witt
mortar.
The concrete thus prepared shall
be Immediately placed in the work
and be spread and thoroughly CON
pacted by rammng until free NOR
tar appears on the surface. Thu
whole operation Of mixing and layinl
each batch OF concrete shall be don,
as eXpeditiously as possible with
sufficient number of skilled men, an,
must be entirely completed before TIN
cement has begun to set. No re
temperlng of concrete shall be per
mitted, and any concrete in which tn,
cement has begun to set shall be re
jected.
Section g. All concrete to be use,
in the work provided for by this or
Idinance may be mixed with suitable
concrete mixing machine, but no sue
machine shall be used in mixing sue
: concrete until the machine to b
used In mixing such concrete fha
, have been first approved by tn
! Board Of Local improvements of tn
said City OF Cairo,
Sand Cushion.
Section 10. Upon the foundatio
thus prepared. as above required
!, shall be spread a layer Of clean san
|