The Detroit times. [volume] (Detroit, Mich.) 1903-1920, 1913-10-22
ID ,is.ooo) pounds per square


Sec. Is. Proportions OF An
: gradients. The concrete for walls.
beams, girders and hoor con
! struction. shall be mixed In me
8 proportion by volume OF one ll
part of Portland cement TO two
parts OF sand and not more than
four ca parts OF either broken
= stone or gravel.
be mixed In the proportion OF one
2 "a part Portland cement, one and
one-haif uh) parts OF sand ana
! three lsl parts Of broken stone
3 or gravel In no case s/iil more
q than two CD parts OF sand be
Z used TO one CD part OF cement
When an aggregate or mixed
sand and stone or gravel - useu
II Cd part OF Portland cement to
2 four and one-half Nh) parts or
= such aggregate FOR concrete 10 Do
= used In walls. beams, girdcrs and
8 part cement to three. and one
Z quarter tSM) parts OF such as.
- gregate for concrete to be used
. In columns. Such aggregate must
10 not be used unless IL leaves
] residue OF gravel or crushed stone
2 upon one-auarter-inch sieve
3 amounting to not less than sew
= enty per cent t7osv) nor more
IS original volume. Mixed aggregate
q which does not fulfill these re-
IS quirements may be used IL crush
% ed stone, gravel or sand IL added
o TO produce the proper proportion.
u The superintendent shall keep
Y one-quarter CD inch sieve AZ
3 the work and shall have such
4 mixed aggregate tested at least
10 once each day while concrete IL
Is being poured.
II All mixing shall be done by
IS machine III the total amount or
- concrete exceed hfty 600 cubic
20 yards.
y ents must be ascertained by ac-
g tual measurement. Clean water
"a free from strong acids or alkalis
IS must be used in all mixing.
10 Iron Stag or other similar por-
IS place or broken stone or gravel.
10 when approved by the Depart
30 ment OF Buildings. and In such
i cases the Department Of Buildings
80 proportion of the Stag or other
- similar porous material In order
IS to have the voids properly filled.
Sec. II; Placing Of reinforce e.
shall be accurately located In the
forms and secured firmly against
displacement. They shall have
protection OF concrete not less
than two CD inches thick Tor lat-
s ticed structural steel columns NIL
. ed with concrete. one and one
10 half W inches thick for hooped
IL or plain reinforced columns one
IL bottom and side OF girders and
IL beams and ee-quarters "a
Is inch on bottom Of floor slabs.
is The amount OF concrete pro-
Il lection shall be clear OF the re-
Is inforcing members.
10 Exposed metal centering or ex-
20 posed metal OF any, kind shall not
II be considered factor In the
% strength OF any concrete struc-
% ture.
Sec, IS Placing Of concrete:
5 known as wet mixture
! Before pouring con; coner st;n to saen
ment must be in Its proper posi-
Z tion. and be held there until the
8 pouring Is complete
3 All concrete shall be placed I'M
10 mediately after mixing and any
IL concrete having "A partial set be-
IL fore placing, shall not be used in
IL any portion OF the work nor be
IL returned To the mixer
IL When concreting is once start
Is ed it shall be carried on. as
IL continuous operation. till the
IL pouring OF the section or panel Is
10 completed. II. for any reason e
90 concreting should be stopped, care
81 must be taken to stop the. work
% at such point that the joint
% formed when the work is resumed
"a Will not weaken the member
% structurally.
rs All Columns are to be filled at
81 least two CD hours ahead OF the
20 floor construction. to allow the
20 concrete in the columns TO prop
80 eriy set up; The pouring or .ns
80 theration to the level OF the bot
80 tom OF the girder or beam sup
81 ported by Ii.
IS In pouring columns. the con-
% IL 20 ha uyon
81 or puddled with long pole or
80 lamp to prevent voids and honey
80 combing.. Filling the columns
somSet w, n sHd be p sswes after
az All beams shall be poured 80
43 as to be monolithic with the adj
a jacent slab. that is, poured con
IS tinuously from the bottom OF the
l6 beam to the top OF the slab.
IL When a section of the floor is
4S once poured II shall be left en-
20 tirely undisturbed until the con-
so crete has thoroughly set;
SO crete. that Is set or partially set,
81 the exposed surface OF the old
81 concrete shall be thoroughly
IS cleansed and roughened and have
81 mortar. mixed in the proportion
81 OF one G) part cement to one %
50 part sand. before any regular
so concrete Is poured.
il
s2 the work shall mark In ink on
IS the drawings. the time and the
50 date of the pouring OF tho differ
S. ent columns. girders and Moor
So slabs.
Sec. %. Monolithic walls and
2 piers Monolithic concrete walls,
) constructed In place. without re.
Enforcement. shall be the full
5 thickness prescribed In this ordt-
8 nance for brick walls. and with
7 steel or iron reinforcement. they
s shall be at least sixty-six l66l
Q per cent Of the thickness required
10 for brick walls
IL than one-auarter thD OF one %
IL per cent OF the area of the cross
~ section in each direction;
!. Such concrete shall be thor tho r.
II and all voids filled.
is Exposed top surfaces shall he
10 thoroughly cleaned and dampen-
20 ed before adding the next sue
81 caeding layer.
ARTICLE XIV.
oNCRETE BLOCK CONSTRUCTION.
2 terials. Concrete building blocks
3 may be used for building four
4 stories or less In height, where
the blocks are s spRdHyes oY yb sse
I blocks shall be made Of one part
s standard Portland cement to not
Q more than three parts OF clear
10 sharp. sand and Ave parts OF
IL suitable material. II an aggre-
l3 gate Of mixed sand and gravel he
Ia used there shall be not less than
Is one part OF cement to six parts
Is OF such aggregate. Such aggre-
IL gate upon being separated on a
Is one-quarter inch (H") sieve shall
10 leave upon the sieve a residue OF
30 not less than seventy per cent
n t70cs) nor more than eighty-five
l2 per cent $3.50 OF the original
"a volume, the test TO be made on
"A thoroughly dried material. The
Is materials used shall be free from
,6 dirt and other foreign matter.
,7 properly mixed and manipulated.
Sec Z Maximum percentage of