Brownsville herald. [volume] (Brownsville, Tex.) 1910-current, 1928-03-16

same unGuarded, or from any other
cause. The said bond shall further
recite that all work done by the con-
tractor during the year for which
said bond holds good shall be per-
formed TO the satisfaction Of the
City Engineer.
PROPERTY OWNERS TO CON-
STRuCT DRIvEWAYS: IL Is the
duty Of all persons owning prop
erty on paved streets in the City
OF Brownsville to construct ut their
W cost and expense returns or
driveways paved with brick, stone or
other durable material, leading from
curb line 20 the property line Of
such lots as may be necessary to
enter with any vehicle from the
street, said work to be done on
grades furnished BY the City Engi-
Ger and under his supervision.
INGREDIENTS: Cement or con-
crete sidewalks, driveways. curbs or
cutters shall be built Of Portland
cement. fine aggregate and coarse
aggregate.
Fine aggregate: The fine aggre-
or the fine product OF rock crush,
made from u very hard rock, such as
trap rock, quartz. flint or granite.
The fine aggregate shall be uni
formly graded in size from ons-quar-
ter inch down, but not more than
ten per cent shall pass n screen hav-
ing thirty (30) meshes to the lineal
inch.
Coarse aggregate: The coarse az
gregate may be either n clean, hard,
angular gravel or crushed rock, vary
ing in size from one-quarter inch
to one and one-half inch. The stone
from which such crushed rock IL
made must not be softer than u very
hard grade Of lime stone.
Top finish:
The top finish shall be a mortar
composed of one part Portland ce-
ment and one and one-half parts Of
fine aggregate, thoroughly mixed dry
before the addition Of water. Where
top finish Is used for the finishing
of horizontal surfaces, il must be
applied to the concrete before the
concrete has been in place more
than ten (10) minutes. Where top
finish is used on vertical faces,
such as the face of a curb, it must
be piastered against the form as the
concrete is built up In the from.
After the said form has been re-
moved (which should be done before
the top finish has received its fina:
set) the surface should be .troweied
and then brushed to remove trowel
marks. The only plastering that will
be allowed will be on spots that are
roughened BY the removal OF the
forms, and such pl~astering shall be
done as soon as the forms are re-
moved. All top finish is to be pro-
tected from the hot sun and kept
moist for a period OF three days
after being placed.
Concrete body: The concrete body
shall be composed of one part Port
land cement, two and one-half parts
fine aggregate and four parts Of
coarse aggregate. The ingredients
Of the concrete shall be thoroughly
mixed. sufficient water added to OBJ
tain a consistency satisfactory to
the City Engineer, and the mixing
continued until the materials are
uniformly distributed and each par
ticle Of fine aggregate is thor
oughly coated with cement, and each
partical OF coarse aggregate is
thoroughly coated with mortar. The
concrete prepared as above spefi-
fled shall be immediately deposited
on the foundation or cushion and
solidly tamped with proper hammers
50 as TO fill all voids and until free
mortar appears on the surface.
The above proportions are based on
the assumption that the fine and
coarse aggregates are well graded.
III, in the opinion Of the City Engi-
neer, they are not well graded, then
the concrete shall be so apportioned
that the mortar shall contain ten
tlO) per eent more cement than is
required to fill the voids in the fine
aggregate and the quantity OF mortar
shall be ten (10) per cent more than
is required to fill the voids in the
coarse aggregate, but in no instance
shall the amount Of cement used be
less than one barrel to each forty
(40) square feet of completed walk.
FOUNDATION: The foundation
shall consist OF firm hard soil. from
which all vegetable matter and other
loose material has been removed. In
the event that il is Necessary to build
up the foundation. the same shall be
done with selected earth, or other
material satisfactory 70 the City En-
gineer. and shall be built up and
well tamPed in six (6) inch layers. and
said filling shall extend az least one
I) foot on each side u the walk or
other structure.
LOCATION AND GRADE: All side
walks, curbs or cutters shall be
built as located by the City Engineer.
and on the grade established by him.
At street intersections, and at other
places, the curb and gutter may be
built on q curve having a radius as
specified by the City Engineer, and
the Contractor shall receive no extra
compensation on account of such
work being on a curved alignment.
Where d~riveways occur into private
property across the parkways be-
tween the curb line and the sidewalk,
such driveways shall Be built with
n return curb, having q vertical face
and joining the main curb of the
street with not less than a two CD
foot radius.
CURBS: Standard curbs shall be
six (6) inches In thickness and eigh-
teen (lS) inches in height. To be
built Of concrete, with the exception
Of the face next 70 the street and the
top. which should be composed OF
three-fourths (3-4) inch Of top finish.
The outer corner of the curb shall
be rounded to a three-quarter-inch
radius, as shown on the standard de-
sign on file in the City Engineers
office.
CURB BARS: Where the curb will
be subject to abrasion, the City En-
gineer may require the use Of an
approved form of galvanized curb
bar about two CD inches on the face,
accurate and uniformly cruved. with
q perforated web extending into the
concrete to provide proper anchorage.
CUTTERS: Standard cutters shall
be six (6) inches in thickness and
eighteen (1s) inches in width, the
top three-quarters inch being COM
posed of top finish.
COMBINED CURB AND GUT
TIERS: The standard combined curb
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