Process for the Production of Asphalte Powder for Making Street Asphalte Plaster.
Year: 1897

page_text: Date of Application, 30th Nov., 1897
Complete Specification Left, 30th Aug., 1898-Accepted, 26th Nov., 1898
PROVISIONAL SPECIFICATION.
Process for the Production of Asphalte Powder for Making Street
Asphalte Plaster.
We, Dr. HEINRICH SPATZ, Chemist, of 19, Goltzstrasse, Berlin, and HENRY
QUISTORI, Director, of 7, Spandauer Berg, Westend, both in the Empire of
Germany, do hereby declare the nature of this invention to be as follows:
Many experiments have been made with the object of replacing, by an artificial
product, the natural asphalte which when pulverised and warmed is used as an
asphalte plaster for streets, on a concrete bed. The trials made by mixing pulver-
ised limestone or chalk with bitumen or similar additions have had no satisfactory
results.
In the natural asphalte which consists of carbonate of lime and pure bitumen,
each molecule of lime is evenly surrounded by bitumen.
With the most thorough mechanical disintegration, limestone can never be
brought to the requisite fineness, which can only be obtained by chemical treat-
ment. Such molecule formation however is necessary in order that the particles
of lime may be evenly covered with bitumen, as is the case with natural asphalte.
With this object the lime stone, dolomite or any other carbonated lime is burnt,
changing into calcium oxide, and by dissolving in water it becomes calcium
oxyhydrate. This is mixed, in large containers, with the requisite quantity of water
and through this mixture carbonic acid or air containing carbonic acid is forced
by means of suction and pressure pumps until the calcium oxyhydrate is con-
verted into carbonate of lime, which can be ascertained by reactions.
By deposition, decanting and drying a carbonate of lime is obtained, divided so
finely, as would be impossible by mechanical pulverisation. The molecules of
earbonate of lime so formed are alone suitable to be evenly surrounded with
bitumen on warming, as is the case with natural asphalte. The asphalte limestone
powder can then be applied to the same uses and treatment as the natural asphalte
powder which it resembles in appearance.
TYLIAK: 90th dure of Novombor 1897
WHEATLEY & MACKENZIE,
40, Chancery Lane, London, W.C., Agents.
Process for the Production of Asphalte Powder for Making Street
Asphalte Plaster.
We, Dr. HEINRICH SPATZ, Chemist, of 19, Golzstrasse, Berlin, and HENRY
QUISTORP, Director, of 7, Spandauer Berg, Westend, both in the Empire of
ID 71

page_text: Germany, do hereby declare the nature of this invention and in what manner the
same is to be performed to be particularly described and ascertained in and by the
following statement:-
Many experiments have been made with the object of replacing, by an artificial
product, the natural asphalte which when pulverised and warmed is used as
asphalte plaster for streets, on a concrete bed. The trials made by mixing pulver-
ised limestone or chalk with bitumen or similar additions have had no satisfactory
results.
In the natural asphalte which consists of carbonate of lime and pure bitumen,
each molecule of lime is evenly surrounded by bitumen.
With the most thorough mechanical disintegration, limestone can never be
brought to the requisite fineness, which can only be obtained by chemical treat-
ment. Such molecular formation however is necessary in order that the particles
of lime may be evenly covered with bitumen, as is the case with natural asphalte.
With this object the limestone, dolomite or any other carbonated lime is burnt,
changing into calcium oxide, and by dissolving in water it becomes calcium
oxyhydrate. This is mixed, in large containers, with the requisite quantity of water
and through this mixture carbonic acid or air containing carbonic acid is forced
by means of suction and pressure pumps until the calcium oxyhydrate is con-
verted into carbonate of lime, which can be ascertained by reactions.
By deposition, decanting and drying a carbonate of lime is obtained, divided so
finely, as would be impossible by mechanical pulverisation. The molecules of
carbonate of lime so formed arc alone suitable to be evenly surrounded with
bitumen on warming, as is the case with natural asphalte. The asphalte limestone
powder can then be applied to the same uses and treatment as the natural asphalte
powder which it resembles in appearance.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is:-
A process for the production of asphalte powder from bitumen and limestone
characterised by burnt carbonated lime being transformed into calcium oxyhydrate,
the latter being mixed with water and treated with carbonic acid or air contain-
ing carbonic acid until the calcium oxyhydrate is turned into carbonate of lime;
from which is formed by deposition decanting and drying, a powder of the utmost
conceivable fineness, with which powder the bitumen is mixed and intimately
combines therewith on warming.
Dated this 30th day of August 1898.
WHEATLEY & MACKENZIE,
40, Chancery Lane, London, W.C., Agents.