The Cairo bulletin., 1912-09-09

the width between the inner faces
OF the curbs. of forty (40) feet.
Section 3. All concrete to be used
Lin the work provided for by this or
iinance may be mixed with u suit
able concrete mixing machine, but
no such machine shall be
used in mixing such concrete until
the machine I'd be used In mixing
such concrete shall have been first
approved by the Board of Local I'M
provements of the said City of Cairo
Sand Cushion.
SECTION 10. Upon the foundation
thus prepared, as above required,
shall be spread layer of clean sand
of the uniform thickness oftwo t2)
inches; and upon this sand, as
cushion, shall be laid the paving
brick.
The Bricks.
Section IL, The tricks shall be
straight. regular In size and shape,
and free from flaws and cracks.
They shall not be less than 2hx4x8
nor more than 3Rx4x9 inches. They
shall be expressly made for paving
purposes and shall be hard and
tough and thoroughly vitrified, aud
must not absorb more than four per
cent. of their weight In water after
being broken and Immersed for
Iforty-eight (4SI hours. When de-
sired by the said Board of Local In
proyements or by the City Engineer
of the city. the bricks shall be sub
mitted to test Of one t1) hour ia
the National Brick Manufacturers
Association Standard Rather, sand
under conditions prescribed by that
association, and If the loss by abrais-
ion during such test exceeds twenty
| l201 per cent. of the original weight
OF the bricks tested, then such bricks
shall be rejected. They shall not
contain lime In such quantities as
TO cause disintegration or cracking
after being immersed In water ten
| tl0) days.
| Nosed brick shall be used on the
| inside of the car track or tracks and
switches or turnout tracks, Vi the
said Cairo Electric and Traction
Company next To the rails OF ~sa4d
| track or tracks and switches or turn
| out tracks. and said nosed bricks
| shall be Of the same general dimen-
sions and character as the bricks
| which are to be used for the bat
ance OF said brick pavement.
Laying the Bricks, Rolling and Wet
ting Surface, &c.
Section Y. The bricks must be
| closely and evenly laid In true
straight lines at right angles to the
| curbing; and all joints must n be
| broken at least three ca inches.
| Whole bricks only shall be used *
| cept in starting and finishing
courses at the curb or at catch
| basins, manholes, etc. In which case
| nothing but half brick shall be used
and In breaking bricks for this pur-
! pose the joints must be cut straight
and square with the tops and sides.
Said bricks shall be laid upon their
edges and shall be one course deep
When the bricks have been laid. /
the surface shall be made smooth by
rolling with a roller weighing not
| less than three CD tons nor more
than six (6) tons; or where rolling
is impracticable Their by tamping
with ninety 800 pounds tamper
upon a twelve (l2) inch oak plank
at least six 49, feet long.
| The pavement shall then be thor
oughly wet by the contractor 80 that
all soft bricks can be detected and
all such bricks shall be removed and
replaced with good hard ones; ana
all defective bricks found in tho
pavement shall be. removed by the
contractor and be replaced with
good ones
Expansion Joints.
| Section ID. There shall be ex-
pansion Joints or cushions across
the pavement and at right angles, to
the eurbing, every twenty-five (25)
leet, and a continuous like joint or
cushion between the paving and the
| gutter, made OF hot asphalt or No
six go pitch. one ti1 inch thick,
and extending from the top OF the
paving down to the bottom Of the
bricks.
| The Filler.
Section IA. After the rolling of
the brick Is completed, the filler or
cement grout, which shall be COM
! posed of equal parts of clean. sharp
sand and Portland cement, shall be
made and applied In the following
manner:
The sand shall be dry and not ex-
ceeding one-third tl-3) of bushei
| thereof, together with like amount
of Portland cement. shall be placed
| In box and naked dry until the
mass assumes an even and unhroken
| shade and then. clean water shall he
| added so as to form a liquid of the
consistency OF thin cream From the
| time the water is applied until the
last drop is removed and floated into
the Joints of the brick pavement,
1.-THE grout shall be kept in constant
motion. The mixture shall be re-
moved from the box to the street
L 18Th s,r,nr nIax,~l Fs ttta