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Патент USA US2409095

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comma 0R PLAsnc
Patented Oct. 8, 1946
Carl C. Ahles, Albany, N. Y.
No Drawing. Application May 29, 1943,
Serial No. 489,257
4 Claims.
(Cl. 106-97)
My invention relates to ballast blocks, counter
weights and the like, and particularly to articles
of this type which are magnetic to facilitate the
handling thereof by electromwa'lg'r'iets, and which
duces a considerable quantity of ?nes which may
are cold molded or cast, like concrete
dense mass of excep o
0 form a
rav y. *
be readily separated from the lighter materials
by magnetic separators. Such ?nes are preferably
used alone with the hydraulic cement to form
5 concrete consisting en'tifélybf fine‘ aggregate and
a binder, or, as a ?ne aggregate mixed with a
coarse aggregate of magnetite. However, a satis
At the present time due to the great demand for
factory, heavy, magnetic concrete may beformed
iron and steel and other heavy metals in the pro
by combining a coarse, or a partly coarse and
duction of war materials, substitutes for iron pigs 10 partly ?neLheavy’aggreg‘ate suchjfor example as
and the like which have been heretofore used
or ore, which ma or may not be magg
for ship ballast, counterweights, etc., have been
ne 10 W1
a. comparatively smmm
sought. What is needed is a material of high
Hr'ie my?etite. Of course the magnetic proper
speci?c gravity which can be ‘utilized en masse,
concrete will vary with the proportion
or in the form of blocks which can be conveniently 15 of magnetic material therein but concrete in
handled and closely packed and which are formed
which mjgnetite constitutes 10% or more, by
weight. of the total aggregate can be handled
of materials not so essential in the war effort as
the various heavy metals.
Ordinary concrete
with the present types of magnetic equipment.
Because most of the lighter materials can be
of blocks and for these reasons would be an ideal 20 eliminated from the ?nely crushed ore and the
resulting concrete is therefore of higher speci?c
material were it not for its comparatively low
can of course be cast en masse or in the form
speci?c gravity and the di?iculty of handling and
placing preformed blocks made therefrom. Cop
per, lead, or other heavy slags might be used in
gravity, I prefer to use, as an aggregateLmagne
of special ?ne crushing must be undertaken to
produce a desirably dense concrete. Further
portion of voids. Only su?icient water to form
tite. 6W‘?! mil-mesa. lioJlL'Biév'éI "The
Bro=portion of dry voids in such a mass is com
the concrete as an aggregate instead of stone, but 25 paratively small, usually from 30 to 40%, and the
in crushing the same, insu?icient ?nes are pro
cement which is required to ?ll these voids, and
Vv‘liicli‘is of course much lighter than the mag
duced to use with the larger particles in order
to make a dense concrete and hence, either a
netite, does not reduce the speci?c gravity of the
fine aggregate of substantially lower speci?c
?nished concrete to the same degree as would be
gravity, such as sand, must be used, or the expense 30 the case with an aggregate having a greater pro
a workable mix should be used.
more concrete blocks of such aggregate cannot
Where the material is cast in the form of blocks
be conveniently handled and are a poor substi
which must be handled or shipped, as distin
tute for iron pigs.
35 guished from casting en masse, I prefer to use
The principal objects of my invention are to
from four to six parts by weight of magnetite to
oncrete structure having a very
e inmany localities an w
mre - yer,
one part by weight of hydraulicwcem‘e?t'bécause,
when the magnetite ratio is appreciably increased
the blocks are not so strong.
If the blocks are
will impa? niag‘?i‘tic
“- t e blocks 40 subjected to Mg treatment they will,
maHe'Thereirom which will facilitate W intwenty-four ours,
op a crushing strength
With these objects in view I have formed highly
satisfactory ballast blocks from a concrete com
prising, by weight, one part of h draulic cemen
and from four to eight parts of
netite. 'Euc?
blocks are highly magnetic and t?us may 5e easily
handled by electromagnets. Magnetite is the
of around three thousand pounds per square inch.
Thus the blocks may be made one day and shipped
the next. In twenty-eight days they will acquire
45 a crushing strength of about four thousand
pounds per square inch. In casting, the use of
vibrating molds or other means for producing a
dense structure are preferably employed.
magnetic oxide of iron (Fe-404) and, when pure,
While, as pointed out above, I prefer .to form
contains more than 72% of metal. The speci?c 50 the blocks entirely of ?ne aggregate anwg
gravity is about 5.1. As found in nature, the mag-F, cementI because by ely crus g the ore a purer
netite may be combined with lighter, non-mag?‘
and heavier concentrate is obtained, it is to be
netic materials and the speci?c gravity may vary
understood that both the ?ne aggregate and the
from about 4.2 to 5.1. However, as distinguished
ate may be magneti
On the other
from slags, the magnetite, when crushed, pro 55 $5, as pointed out a?a?lg‘gates of other
heavy materials such, for example, as co
r or
By the term, f‘ballast blcclr," as used in the
lead sla s may be used with a ?ne aggrega e con
claims, I mean to include both precast blocks of
regular shape and concrete cast en masse.
What I claim is:
1. A magnetic ballast block having a specific
gravity of the order/993 and up and formed of
s'?'t'ing' % whole or in part'of magnetite, and
blocks made therefrom will be sufficiently mag
netic to permit oi’ their being handled by elec
tromagnets. In any case however it should be
borne in mind that a dense concrete of the
heaviest materials is desired and the coarse and
concrete comprising, by weight, about one part of
hydraulic cement and from about four to about
?ne aggregate should be proportioned with this
end in view so that the voids, which are neces
eight parts of magnetite.
sarily ?lled with thecement which is very much
lighter, are reduced .to a minimum.
Ballast blocks made of ?nely crushedhmagnetite
and Portland cement should weigh in excess'df
un re
e y pounds per cubic foot or, in 15
2. A magnetic ballast block having a speci?c
gravity of the order of 3 and up and formed of
concrete comprising, by weight, about one part of
hydraulic cement and from about six to about
eight parts of magnetite.
3. The structure set forth in claim 1 in which
other words, have a speci?c gravity of the order
the cement is Portland cement.
of about 3 or more; and, due to their regular size,
4. The structure set forth in claim 2 in which
they may be piled or packed very closely so that,
the cement is Portland cement.
when any given space is ?lled thereby, the ag
gregate weight is almost equal to that of the iron 20
pigs which can be placed in said space.
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