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


cent for each decrease OF one SIX
= tcenth I-l6) inch IN thickness, be-
low fye-sixteenths (5-lC) inch, a
deduction OF two and one-half
(2r) per cent
Test specimens for bending shall
! be bent cold around "a diameter
equal TO their least thickness, To
the following angles without frac-
ture on the outside Of the bent por-
ton.
I For specimens one ca inch thick.
so degrees
) For specimens three-quarter tAD
inch thick. 30 degrees.
For specimens one-hal: ca inch
thick. 10 degrees.
For specimens one-quarter CD
inch thick. $50 degrees.
For specimens three-s Xteenths
: t3-16) Inch thick. lao degrees
For specimens one eighth (L)
inch thick, 100 degrees.
cement shall conform to the stan
dard specifications OF the American
, Society for Testing Materials. in
D force Dec. !. 1910. except that the
minimum require for tensile
2 strength shall be as noted in sec
3 ton 35 OF this article.
1c) SAND. The sand shall be
clean. free from any organic mat
s ter and graded from coarse to fine.
Cd STONE. GRAVEL OR STAG
The stone shall be clean crushed
stone, free from dirt or dust and
The gravel shall be washed
clean.
5 The Stag shall be clean crushed
1 blast furnace Stag.
All aggregate must be OF such
5 size as will pass through three
quarter (A) inch screen and be re-
tanned on a one-qusrter (h.) inch
, screen.
Sec. Is. MATERIALS PROHIB-
he fnllnxUin0 fnafaria a
3 shall not be used in reinforced con
4 crete construction: Boiler cinders.
plaster OF paris. sulphate OF limo
8 and all similar injurious materials.
Sec 16. CENTERING AND
2 FORMS All monolithic reinforced
8 concrete shall be built on centers
I or forms.
5 All forms shall be built strong.
8 unfolding. plumb and true. thor,
8 joints. so that no appreciable part
= Of the concrete mixture can escape,
0 and they shall he supported 10
1 carry ali Of the usual loads which
2 may come upon them without
5 spring or DETECTION.
For columns an opening shall be
left at the bottom OF the form. Tor
6 cleaning and adjusting the steel.
The opening shall not be closed
8 Columns over fourteen ID feet
0 in height. and under eighteen 1O
l inches square, shall have an Inter
mediate opening or pocket and the
pouring started therefrom. The
4 forms shall be thoroughly cleaned
S Immediately before the concrete Is
8 poured. and all chips. ice and other
foreign matters removed
s Before removing the shores un-
3 der any beam or girder. the column
o supporting II shall be stripped. so
! that the column may be examined
2 on all sides.
; II ample shores are used to carry
4 the full weight of the floor. column
forms may be removed az soon as
6 the concrete has set UP hard, pro-
vided that the said forms shall not
8 be removed'within seventy-two (7G
hours after pouring.
] forms. may be removed at the ok
2 piration OF six 60 days after pour
ing.
fore removing the shores under the
Orders and beams. Will vary with
the design and the conditions OF
8 the weather. but in no case shall
3 they be removed in less than three
0 t3) weeks after pouring.
] The supports under door slabs
2 shall not be removed In less time
3 than ten G0) days after pouring.
4 but this clause Is not intended TO
s tagging within less time. provfd-
ed the slabs are kept properly
Sec II. PLACING OF REIN
FORCEMENTS.. All reinforcing
8 members shall be accurately locat
4 ed in the forms and secured firmly
against displacement, They shall
6 have protection OF concrete. not
7 less than two t2) inches thick for
s columns, one and one-half IL "
. inches thick on the bottom and
0 side OF girders and beams and
l three-quarters tA) inch on bottom
2 Of floor slabs.
3 The amount of concrete protec-
tion shall be clear of the reinforc-
ing members.
6 Exposed metal centering or ex-
Z posed metal of any kind. shall not
8 be considered factor In the
Sec. is. PLACING OF CON
2 CRETE. All concrete Is to be what
5 Is known as wet mixture"
piece s,0o of steel Reei or IRON reinforce.
6 ment must be In it's proper posi-
Z ton, and be held there until the
3 pouring is complete.
3 All concrete shall be placed i'm
0 mediately after mixing and any
l concrete having partial set be-
2 fore placing, shall not be used In
3 any portion Of the work nor be
returned to the mixer.
5 When concreting 10 once started
S II shall be carried on as a contin-
Z uous operation, till the pouring OF
s the section or panel Is completed.
3 H. for any reason the concreting
. should be stopped. care must be ia
2 point that the Joint formed when
3 the work Is resumed. Will net
4 weaken the member structuraily
5 All columns are 10 be filled
8 sufficient time ahead OF the hoor
: construction. to allow the concrete
\ I'm the columns to properly set up.
3 The pouring Of the column must be
D in one continuous operation TO the
level OF the bottom OF the girder
2 or beam supported by II.
3 In pouring columns. the concrete
4 is to be kept well stirred or pud-
3 died with long pole or lamp TO
s prevent voids and honey combing.
I All beams shall be poured 30 as
3 to be monolithic with the adjacent
= slab, that is. poured continuously
0 from the bottom of the beam to
| the top OF the slab.
, When section OF the moor Is
3 once poured. II shall be left on
4 tirely undisturbed until the con-
5 crete has thoroughly set
6 When fresh concrete Joins con
7 crete that Is set or partially set
s the exposed surface OF the old con-
q crete shall be thoroughly cleaned
0 and roughened and have applied to
ii a coating OF cement mortar. mix
= ed In the proportion or one Cd
part cement 10 one W phIl
I sand. before any regular concrete
is poured.
i The superintendent In charge OF
: the work shall mark In ink on the
8 drawings, the time and the date or
2 the pouring OF the different col
umns. girders and floor slabs.
Sec 49, FREEZING Wealth
Q Err Concrete work shall not be
z permitted when the temperature Is
~ degrees Fahrenheit or less, uh-
Z less sufficient precautions are ia
4 ken to prevent the concrete from
! freezing after having been put In
\ place.
2 All forms must remain until as
q surance il had that all frost has
1 left the concrete and II has OBJ
2 tained It's permanent set
2 No frozen material or materials
4 covered with ice shall be used
L. a