OXYDE DE FER ADDITIONNE DE PARTICULES D'ALUMINIUM POUR LE REMPLISSAGE DES NIDS DE POULE D'UN REVETEMENT DE VOIE CARROSSABLE

IRON OXIDE WITH ALUMINUM PARTICLES FOR FILLING CHUCK HOLES IN PAVEMENT

Abrégé anglais

ABSTRACT OF THE DISCLOSURE
A metal producing patch material for filling chuck holes in pavements
consists of a mixture comprising between about 10% and 20% pitch, between
about 20% and 25% refractory particles, and exothermic materials which
comprise between about 37% and 60% iron scale and between about 10% and
18% aluminum particles, the iron scale and aluminum particles being
present in amounts sufficient to form an exothermic reaction when ignited
to melt the iron in the scale and form a molten liquid which includes the
refractory particles therein. This invention distinguishes from others by
reason of the inclusion of iron scale in amounts greater than needed for
the exothermic reaction with the aluminum particles, so as to result in
a metal producing material.

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Revendications

The embodiments of the invention in which an exclusive property or
privilege is claimed are defined as follows:
1. A metal producing material for filling chuck holes in pavements
consisting of a mixture comprising between about 10% and 20% pitch, between
about 20% and 25% refractory particles, and exothermic materials which
comprise between about 37% and 60% iron scale and between about 10% and
18% aluminum particles, the iron scale and aluminum particles being present
in amounts sufficient to form an exothermic reaction when ignited to melt
the iron in the scale and form a molten liquid which includes the refrac-
tory particles therein.
2. The patch material set forth in Claim 1 and wherein the pitch
comprises 10% of the mixture, the refractory particles comprise 20% of
the mixture, the iron scale comprise 60% of the mixture and the aluminum
particles comprise 10% of the mixture.
3. The patch material set forth in Claim 1 and wherein the
refractory particles take the form of ground brick.
4. The patch material set forth in Claim 1 and wherein the
refractory particles take the form of blast furnace slag.

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Description

Background of the Invention ~ 1 ~ 6

(1) Field of the Invention:
,
This invention relates to patching materials for chuck holes in
pavements and the like.
(2) Description of the Prior Art
No prior art is known wherein a mixture of materials including exo-
thermic materials produces a molten slag-like liquid suitable when cooled
to form a durable and bonded patch in a chuck hole.
Prior patching compositions have used mixtures of aggregate and
bitumen and/or Portland cement as for example in United States Patent
No. 1,230,894 of June 26, 1917 wherein a flamable liquid placed in the
chuck hole in a bituminous pavement and ignited, heats it sufficiently to
theoretically bond a bituminous material patch positioned therein.
This invention utilizes such materials as ground ceramic brick, pitch
and exothermic materials including aluminum particles and iron scale to create
a molten liquid in the chuck hole which rapidly cools upon the end of the
reaction of the exothermic material to form a desirable bonded patch.
Summary of the Invention
A patch material for chuck holes in pavement utilizes a ground ceramic
brick and pitch and/or other refractories and exothermic material such as
thermite in a mixture wherein the exothermic material is suffTcient to
generate temperatures reducing the other materials to a molten liquid in
a chuck hole to be filled. Upon cooling,the molten liquid forms an integral
thoroughly bonded durable patch in the chuck hole.
Description of the Preferred Embodiment
In its disclosed form the patch material for chuck holes in pavements
consists of a dry mixture of ground ceramic brick, clay or similiar refrac-
28 tory material, pitch and exothermic materials such as thermite which comprises
a mixture of finely divided metallic aluminum and one or more oxides, as of
iron, in a quantity sufficient to produce when ignited an extremely high tempera-

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ture as the result of the union of the aluminum with the oxygen of the oxide
so as to reduce the ground brick or blast furnace slag and/or other
refractory materials to a molten liquid. A typical batch of the patch
material would comprise between about 20% and 25% ground ceramic brick,
between about 10% and 20% pitch and exothermic materials comprising between
about 10% and 18% aluminum particles and between about 37% and 60% iron
scale and may be conveniently positioned in a chuck hole to be filled in a
pavement and ignited by the creation of ignition temperatures in the iron
scale and aluminum particles (thermite) as will occur to those skilled in
the art.
Alternately the ground ceramic brick or blast furnace slag or other
refractory materials employed may be separated from the exothermic materials
and a desirable quantity of the exothermic materials added thereto in the
chuck hole and ignited in concentrated form. In either event, the result-
ing high temperatures from the result of the union of the aluminum with
the oxygen of the oxide in the thermite produces sufficient temperature
for a sufficient time to liquify the pitch and the ground brick, blast
furnace slag or other suitable material or to suspend the ground brick or
other refractory material in the liquified pitch and thereby form a suitable
sealing and bonded patch in the pavement when cooled. Coal tar pitch or
asphalt tar pitch may be used.
Those skilled in the art will observe that in patching a chuck hole
in pavement some sections of reinforcing steel rod are preferably driven
into the pavement in the chuck hole in a crisscross pattern, the patch-
ing mater;al positioned therein and ignited. The patch material works
equally well with black top bituminous asphaltic concrete and/or Portland
cement concrete or in broken brick, cobblestone or other pavement. The
28 molten mass of the patch material flows into intimate contact with the sides

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of the chuck hole and surrounds the steel rods and upon cooling forms a
permanent patch secured in the chuck hole by this self-anchoring characteristic.
It will occur to those skilled in the art that the steel rods positioned
in the chucIc hole add metallics to the mixture which are heavier than the
other components of the molten mass in the chuck hole so that the lighter
material forms the upper portion of the patch and results in a non-brittle,
eminently satisfactory patch in the pavement. The patch forms a smooth and
unbroken area in the pavement occupying the former chuck hole.
In bituminous cement pavements the heat of the exothermic reaction
softens and partially liquifies the bitumen in the asphaltic concrete
which insures the sealing relation of the patch material in the chuck
hole therein.
A typical batch of the patch material can comprise aluminum particles
10~, ground ceramic brick 20~, iron scale 60~, and pitch 10~. It will be
seen that this is a metal producing compound with the ground ceramic brick
floating or contained upon solidification throughout the mass. The molten
mass seeks its own level and bonds itself to the surrounding areas.
It will thus be seen that traffic may be immediately resumed after
the solidification of the patch material disclosed herein.
The patch formed of the material disclosed herein as positioned in
; the chuck holes is able to resist the fros~ and freezing damage which
usually results in the break up and loss of the patch materials heretofore
used in patching chuck holes and the like.
A1though but one embodiment of the present invention has been
described, it will be apparent that various changes and modifications may
; be made without departing from the spirit of the invention.
.
28

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