The herald. [microfilm reel] (Los Angeles [Calif.]) 1893-1900, 1896-05-17

inches square and two inches deep) of
the asphalt layer proposed, with a writ
ten analysis of the same, duly certified
by competent chemist that the analy-
sis Is correct. and was made from the
sample submitted, which sample shall
itself show from where the portion ana
lyzed was taken. The finished pave
ment must conform to the sample block
submitted
Bidders must also submit samples one
foot square and six inches thick of the
concrete proposed, and the materials
comprising said sample of concrete shall
be similar in all respects to that used in
the finished work, /. e.. the sample sub
m1tted snail fairly represent the quality
OF the concrete and its constituent parts
in the finished work.
Bidders must also submit samples of
all materials to be used in the pavement
mixture. in the concrete foundation
and in any other part of the work herein
specified
The contractor shall furnish on de-
mand of the city engineer at any time.
free OF charge, samples of the paving
materials. which the contractor may
have prepared to deposit on the street,
either for foundation or wearing sur
face. and also samples of any and all
materials used in the preparation and
construction of any of the work herein
provided for. The contractor shall put
such samples into the same shapes as
specified for the samples submitted with
bids, so as to facilitate comparison of the
material actually put into the work
with that upon which the bids were
founded.
and lay on the line of the termination
All cement used shall conform to the
following conditions, and be subject to
the following tests: All tests shall be
made by the methods and under the
nnh6ifinnc NJ hn1 Exyt ttN1
of the American Society of Civil Engi-
neers. and shall be open to contractors.
Not less than 95 per cent by weight
OF the cement must pass through sieve
of fifty meshes to the inch; not less than
So per cent by weight of the cement
must pass through a sieve of 100 menshes
to the inch.
Time of setting.--Initial set in not less
than fifteen minutes when mixed neat
with the smallest possible amount of
water at the temperature at which 1t
flows from the tap in the testing room
provided by the city of Los Angeles.
Tensile Strength-After twenty four
hours (briQuettes to remain in air till
hard set; to be submerged in water dur
ing the rest of the twenty-fou hours)
neat, 125 pounds per square inch; after
seven days (bri1uettes to remain in air
one day, in water six days. neat, 300
pounds per square inch; three parts
Sdiiu " one part cement, lUU pounds per
square inch. After twenty eight days
(briquettes to remain in air one day. in
water twenty-seven days., neat, 400
pounds per square inch: three parts
sand to one part cement 125 pounds per
square inch.
Whenever the portion of the street to
be paved is that portion which is re-
CURED by law to be kept in order and
repair by any person or company hav-
ing railroad tracks thereon. granite
blocks of the dimensions of the stones
specified for the cutters shall be laid
against both sides of the rails, the stones
TO be placed header and stratcher, and
laid in the same manner as called for in
the cutters; provided, however, that if
the rails of said track are OF the pattern
known as "T'' rails. and are not less
than six inches in height the asphalt
pavement shall extend to .he rails and
no stones laid against the rails on either
side.
Wherever the pavement does not ter
inmate against curb. gutter or other
pavement the contractor chall provide