The Cairo bulletin. (Cairo, Ill.) 1???-1928, 1912-09-05


ing this bottom course shall first be
thoroughly mixed dry and suff, INT
clean water shall then be addet by
slowly sprinkling to give the mix~
turc the proper consistency and the
whole shall be constantly stirred un-
til the same is thoroughly mixed.
This mass shall be spread In forms
upon the cindef foundation and shall
be rammed until all interstices are
thoroughly filled with t,tA 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 il has had time to
begin TO set, the fins ttss OF wear
ing course shall be added The fin
ishing course shall consist of suI
mortar. composed of one Il part OF
Portland cement and one and one
half Il II parts Of clean, sharp
coarse sand, and shall be laid TO the
depth of one % inch and shall be
carefully smoothed TO an even sur
face, which, after the first setting
takes place, must not be disturbed
by additional rubbing.
The curb and gutter shall be pro-
Tected from the sun and wind for
twenty-four (24 nours after the
completion, during which time 1t
shall be kept moist by sprinkling.
The tops or upper edges Of the
said curbing on both sides of said
pavement shall be, when finished
complete, throughout its entire
length, one inch below the grade
hereinafter specified for the cente:
line of the said brick pavement
when the same has been completed.
| Concrete Foundation.
Section Upon the said sub-grade
and firm earth surface SO prepared
and shaped as aforesaid, shall be
/ laid or spread foundation of Port
land cement concrete, of the uni
form thickness of five 60 inches,
composed of one ID part of Port
! land cement and eight go parts OF
washed. river gravel OF sizes ranging
! from gravel OF two t2) inches in
diameter down TO coarse sand, and
gravel and sand shall not eontai,.
more than twenty t20) per cent.
yoids, 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 shall then be
slowly 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
| Fhe concrete thus prepared shall
be Immediately placed in the work
| and be spread and thoroughly com
ipacted by ramming until free NOR
| tar appears on the surface. The
whole operation Of mixing and lay
ling each batch of concrete shall be
done as expeditiously as possible
with sufficient number of skilled
men, and must he entirely completed
before the cement has begun to set
No retempering of concrete shall be
permitted. and any concrete in which
the cement has begun to set shall
be rejected
Said concrete foundation, includ-
ing the gutter-flags of said com
bined curb and gutter. shall be OF the
width between the inner faces OF
the curbs, of thirty-six $3.50 feet
east OF Commercial avenue and thir.
Ity (30l feet west of Commercial
avenue.
Section g. All concrete to be used
in the work provided for by this or.
dinance may be mixed with suit
able concrete mixing machine, buI
no such machine shall be used In
mixing such concrete until the ma
chine 10 be used In mixing such con.
crete shall have been first approved
by the Board of Local Improvement.
Of the said City OF Cairo
Sand Cushion
Section 10. Upon the foundation
thus prepared, as above required
shall be spread layer of clean sane
of the uniform thickness of two (2i
inches. and upon this sand, as {
lcushion, shall be laid the pavln2
brick.
The Bricks.
Section H. The bricks shall b.
straight, regular in size and shape
and free from flaws and cracks. The,
shall not be less than 21s x4xS no
more han 3hx4X9 inches. The'
shall be expressly made for pavini
purposes and shall be hard anS
tough and thoroughly vitrified, an'
must not ahsorbe mors than four pc
cent. Of their weight In water ante
being broken and immersed for for
lty-eight (4S) hours. When desired
by the said Board of Local Improve
ments or by the City Engineer OF tn
lCity, the bricks shall be submitted
| ta rnn I1A t.a,tt m thp Ma