The Caucasian. (Shreveport, La.) 1900-192?, 1903-06-07

dameters. The upper surface Of the
concrete will be made smooth and eX-
actly parallel with the surface of the
pavement to be laid, and will be pro.
tected from the aeon Of Che sun an&
wind elntD set.
CEMENT.
1.-The cement 1or o. concrete must
be of standard grade Portland or 49,.
dra;1ic ccme1e newly manufactured
The cement while IN >;u~; % or upon
the work, OF whi@ being hr',Ied t. the
work. shall be properly protected. ard
no cemene shall be used which in the
opinion Of the engineer haas been dam
aged by age or exposure.
Cement used must stand the follow
ine tests:
Fineness-sievr No. !co r5 10000
mcshcs per square l'cN Cf 10. 10
Stubhs wire guagc: Portland z per
cent fine; Hydraulic &c per cent fine
Specific eravitv-Samnlc well dried:
Portland $40 10 ,}.25; Hydraulic .:.co
Soundncss-I'ats Of neat cement ;
inches in diameter II inch at enter
with thin edges: Portland thrtc h"urs
boiling test Hydraulic must not crack
or become Conferred along edges in
two days.
Time Of set Portland inijirl 81; IS
minutes, final set 10 hours; Hydra 1lic
initial set As minutes. final set 10 hours
Tensile strengthened briquettes,
strain applied uniform rate to ico
pounds per minute: Portland day I25
pounds, I days 4So pounds; Hydraulic
day Is pounds, ! days I25 pounds
Where natural cement is used in
concrete a reasonable time shall be al
lowed after ramn1l1g concrete before
laying brick or asphalt, to allow con
crete to set. Said reasonable time to be
determined by engineer and condition OF
concrete to be determined b" engineer.
Upon this concrete base will be even
ly spread a layer of fine. reasonably
clean of loan, dirt and other foreign
matter said reasonably Cle&nness, etc,
| to be determined by city engineer and
| Improvement committee, sharp sand. in
such quantity as to insure when COM
pacted a depth of 1-2 inches. to serve
as a bed for the brick.
The brick shall be specially manu-
featured for street paving. Their di-
| mansions must be the same throughout
the entire work, not less than nor
more than 10 inches long, not less than
33-4 or more than inches deep, and
not less than 2 nor more than 8 IL
inches thick. They shall be true in
that the edge angle shall be rounded
from IA to Is of an inch. The quail
ity of the bricks must be uniform in
| texture, evenly burned and free from
cracks or defects.
| Twenty (20) specimen brick indicat-
| ing the kind the bidder proposes to use
| on the work, shall accompany each
proposed submitted to the council.
| Each proposal must also be accOmpan-
| led by written statement from the
manufacturer of the bricks represented
by the specimen submitted, to the eff
feet that brick equal in every respect
to the said specimen and sufficient in
quantity to complete the work within
the time specified will be furnished to
the bidder if the contract is awarded
to him.
Five 60 of the specimen brick will
be submitted to the following tests, at
the expense of the bidder
The five 90 brick will be placed in
tumbler or RATHER, selected by the
engineer and Improvement committee
along with ten cast iron brick with
rounded edges, weighing six pounds
each, without any cushioning material
whatever. The RATHER will then be re-
VOWED for thirty minutes at a speed of
thirty revolutions per minute The
loss in weight after this test, divided
by the original weight, will give the
percentage of loss and the average loss
shall not exceed 20 per cent, and in no
specimen shall it exceed 30 per cent.
In addition to the foregoing, the five
60 brick used in the above test shall
be broken across and then dried for
four hours at temperature of not less
than PIP degrees Fahrenheit, and then
weighed. They shall then be soaked in
water for tWentyfour hours and when
removed from the water and wiped
dray and weighed the increase in weight
| or absorption shall not exceed per
| cent. The remainder of the specimens
| submitted will be retained by the city
engineer to compare with those used
on the work.
All specimens submitted must be
| marked for Identification with a ticket
securely fastened, bearing the name of
| the bidder. the name of the manufac-
| turer ard the place of manufacture
| All brick used in the pavement must
be equal in every respect to the spec
| linen accepted with the proposal.
Broken brick can only be used to break
joints in starting courses or making
closures, but in NO case shall less than
| half brick be used, except in closing
| at the curb.
| On streets where street railroads or
| steam railroad tracks are laid a special
| brick and half brick shall be used in
starting courses from rails, of a pat
tern approved by the city engineer and
| improvement committee.
These special brick shall conform to
the requirements of the regular paving
| brick except as to shape