The Detroit times. [volume] (Detroit, Mich.) 1903-1920, 1910-12-07


~ modification as follows For eacn
80 Increase OF one-eighth thl inch In
81 thickness. above three-quarter CA
s3 cent: for each decrease OF one-six
81 teenth I-i6) Inch I'm thickness, be-
80 low hve-sixteenths ,5-l6) inch, a
20 deduction OF tive and one-half
So Test specimens for bending shall
80 be bent cold around a diameter
30 equal TO their least thickness. TO
IL tho following angles without frac
~ ture on the outside OF the bent por-
AZ ton;
a For specimens one CD inch thick.
AZ so degrees
46 For specimens three quarter ca
~ :nch thick. 30 degrees
as For specimens one-half Gi) inch
40 thick. 10 degrees
80 For specimens one-quarter (h)
81 inch thick. lso degrees.
SO t3-16) inch thick, lao degrees.
81 For specimens one-eighth (h)
IS inch thiek; ls9 degrees -
81 cement shall Conform a sS the her stan
81 dard specifications OF the American
So Society for Testing Materials. In
80 force Dec. l. 1910, except thar the
81 strength shall be as noted In sec
SO ton rs of this article.
"a te) SAND. The sand shall be
So clean. free from any organic mat
67 (d) STONE. GRAVEL OR STAG
6S The stone shall be clean crushed
81 stone, free from dirt or dust and
70 freshly broken.
q The gravel shall be washed
rs The Stag shall be clean crushed
"a blast furnace Stag.
20 All aggregate must be Of such
Il quarter 10 Inch screen and be re-
IS tanned on q one-Quarter (h) inch
10 screen.
,, s:S; Is MATERIALS ;'aM,Ia PR s;sl,n,.
8 shall not be used in reinforced CON
plaster OF paris. sulphate OF limo
and all similar !ntaTiS RsS mster hNb
2 FORMS. All monoiithic reinforced
5 concrete shall be built on centers
S All forms shall be built strong.
6 unyielding. plumb and true, thor
oughly braced and with tight
Joints. SO that no appreciable part
> of the concrete mixture can escape,
10 and they shall be supported TO
II may come upon them without
Is spring or detection
IA For columns an opening shall be
10 left at the bottom OF the form. for
is cleaning and adjusting the steel.
IL The opening shall not be closed
ID until the column Is to be poured.
1s Columns over fourteen !lD feet
20 in height. and under eighteen 1D
81 inches square, shall have an inter
22 mediate opening or pocket and the
23 pouring started therefrom. The
"a forms shall be thoroughly cleaned
rs Immediately before the concrete Is
26 poured. and all chips. ice and other
81 foreign matters removed.
2S Before removing the shores I'M
20 der any beam or girder. the column
80 supporting IT shall be stripped. so
32 on all sides.
80 II ample shores are used to carry
"a the full weight OF the floor. column
35 forms may be removed as soon as
SO the concrete has set up hard. pro-
81 vided that the said forms shall not
3S be removed within seventy-two CID
SO hours after pouring.
40 The sides OF girder and beam
Al forms. may be removed at the ex-
az piration Of six co days after pour
AZ ing:
As fore removing the shores under the
40 Orders and beams, Will vary with
~ the design and the conditions OF
4s the weather. but I'm no case shall
~ they be removed In less than three
so CD weeks after pouring.
81 The supports under hoor slabs
So shall not be removed In less time
So than ten I0) days after pouring.
55 prevent removing the joists and
Sc tagging within less time. provid-
s. ed the slabs are kept properly
Sec II. PLACING OF REIN
FORCEMENTs. All reinforcing
members shall be accurately locat-
4 ed in the forms and secured firmly
against displacement. They shall
less than two CD inches thick for
columns. one and one -half t1E
inches thick on the bottom and
10 side OF Orders and beams and
4 a,rta A ~ \ In on a m
~ of floor slabs.
Is The amount OF concrete protec-
IA ton shall be clear OF the reinforc-
10 Ing members
II posed metal OF any kind, shall not
Is be considered a factor In the
~ strength Of any part Of any con-
Sec. IS. PLACING OF CON
CRETE. All concrete is to be what
8 is known as wet mixture"
! Before pouring conerete: each
ment must be In Its proper posi-
Z ton, and be held there until the
pouring is complete.
All concrete shall be placed i'm
10 mediately after mixing and any
~ fore placing. shall not be used In
l3 any portion OF the work nor be
II returned to the mixer.
Is When cOncreting Is once started
10 IL shall be carried on as a contin-
II uous operation, till the pouring OF
10 the section or panel Is completed.
10 IL. for any reason the concreting
90 should be stopped. care must be, Ia
81 ken to stop the work at such IA
22 point that the joint formed when
20 the work is resumed Will not
- weaken the member structurally.
% All columns are 10 be filed a
26 sufficient time ahead OF the floor
% construction. to allow the concrete
20 In the columns TO properly set up.
80 The pouring Of the column must be
80 In one continuous operation TO the
81 level Of the bottom OF the girder
80 or beam supported by IT.
s3 In pouring columns, the concrete
- Is to be kept well stirred or pud-
80 died with long pole or lamp TO
SO prevent voids and honey combinK
81 All beams shall be poured so as
SO TO be monolithic with the adjacent
80 slab, that Is, poured continuously
10 from the bottom OF the beam TO
Al the top OF the slab.
AZ When a section OF the floor is
AZ once poured. IL shall be left en-
a tirely undisturbed until the con-
As When fresh concrete Joins con
AZ crete that is set or partially set,
As the exposed surface OF the old con
~ crete shall be thoroughly cleaned
so and roughened and have applied to
81 IL a coating OF cement mortar, mix
81 ed I'm the proportion or one ID
SO part cement to one Cd part
81 sand before any regular concrete
b5 is poured.
56 The superintendent I'm charge OF
81 the work shall mark In ink on the
IS drawings, the time and the date OF
81 the pouring Of the different col
60 umns. girders and floor slabs
Sec 10 FREEZING Wealth :
2 Err Concrete work shall not be
permitted when the temperature II
So degrees Fahrenheit or less. un-
s less sufficient precautions are ia
ken to prevent the concrete from
! freezing after having been put if
place.
All forms must remain until as
IN surance is had that all frost has
II lot tho concrete and IL has OBJ