The Madison daily leader. [volume] (Madison, S.D.) 1890-current, 1917-07-10

gravel, clay and other suitable firm
material, which shall be placed in
layers not exceeding six inches in
depth and thoroughly tamped or
compacted. No ashes or other loose
material Of any kind will be permit
ted in any fill for cement wall con
struction. The top three inches of
the fill shall be of gravel and placed
as provided under Article 10. The
width of the fill at the subgrade ele-
walton shall be not less than IS
inches wider than the walk to be
built, and the side slopes of the fill
shall be not less than n and one
half horizontal to n vertical.
Sec. a. Cement. The cement
used shall be of some approved
brand of Portland cement, fully com
plying in every respect with the spec
ifications for Portland cement of the
American Society for Testing Mate
rails. The city commissioners re-
serve the right to direct the city en-
gineer to test any and all cement
brought upon the ground and to re-
ject any that does not prove of a
suitable or satisfactory quality.
Sec. 5. Fine Aggregate. Fine ag-
gregate shall consist of washed nat
ural sand or crushed rock screenings,
of hard and durable character. 1t
shall be clean and free from all veg
etable or deleterious matter and con
tanning not more than three go per
cent of clay or loan.
1t shall pass, when dry, through a
screen having four CA meshes per
linear inch, and not more than TWEEN
ty-five C25) pei cent shall pass a
screen having fifty 900 meshes per
linear inch, and not more than five
I'D per cen shall pass a screen hav-
ing n hundred (100) meshes per
linear inch.
All fine aggregate shall be subject
to test by the city engineer before
used. and none shall be used in n
part of the work until it has been so
inspected, tested and approved.
Sec. 6. Coarse Aggregate. Coarse
aggregate shall consist of clean.
washed, hard, durable gravel, or
crushed rock. 1t shall range uni
formly in size, shall pass a screen
having round openings n ca inch
in diameter, and not more than five
go per cent shall pass a screen hav-
ing four (4) meshes per linear inch.
Sec. Z. Pit Run Aggregate. The
use OF pit run aggregate will only
be allowed by special permission of
the commissioners or city engineer.
otherwise all material must be
screened out with screens of proper
sizes, and remiXed i'm proportions as
provided for in the specifications for
each class or kind of work.
Sec. g. Two Course Cement Walks.
Mixing and Placing Base Course.
The concrete in the base course shall
be mixed in the proportions of one
part Portland cement to two and one
half parts fine aggregate and five
parts coarse aggregate. all materials
as provided for herein.
The concrete shall be mixed in n
machine batch mixer only, so arrang-
ed hat the proportions of cement
fine and coarse aggregate and wa
ter may be regularly and precisely
measured.
The cement and aggregate shall
first be placed i'm the mixer and
mixed until of uniform color. after
which sufficient clean water shall be
added to make a mixture of a plastic
consrstence, which shall be immedi-
ately put i'm place, tamped if neces-
sary and struck off to the proper sur
face. N inch below the established
grade of the finished walk.
Sec. 8. Mixing and Placing Ton
Course. The top course shall con
lefct nf DnrtluVJ $50
in the proportions of ore part Port
land cement to one and one-half parts
OF sand, or materials as herein speci-
fled. 1t shall be mixed as provided
under Article 16, of these specified
tions. and shall be placed upon the
base course before the concrete i'm the
base has taken its initial set, so thai
they shall join perfectly and produce
a monolithic construction.
The top curse shall be thoroughly
troweled down to the proper grade
and surface, finished with a wood
float, and marked off with transverse
markings, into blocks approximately
four feet square. Finish along each
edge of the walk and along the trans
verse markings with a jointer oil
edger having a radius of approx.
mately one-half inch.
Sec. 10. Expansion Joints. At in
tervals of not more than so feet shall
be placed an asphaltic expansion
joint one-half inch in thickness. ex-
tending entirely through the con.
crete, from subgrade to surface, and
finished off flush with the surface
of the walk.
Sec. IL. Concrete Street and AL.
ley Crossings. General Construction
The %subgrade shall be prepared with
three inch gravel fill as hereinbefore
specified; the base course mixed in
the same proportions and placed al
specified herein under Article 16. ex
cept that it shall be five inches in
thickness. The top course shall be-
mixed in the same proportions ano
placed and finished as provided un
der Article II, except that it shall b.
two inches in thickness.
One Course Cement Walks ant
Crossings. One course cement walks
and crossings shall be built upon ;