Cuttable concrete, its process of manufacture and its process of

Details Cuttable concrete, its process of manufacture and its process of Cuttable concrete, its process of manufacture and its process of

1994-06-30

1995-12-26

Marcantoni, Paul

Compositions: coating or plastic

Coating or plastic compositions

Inorganic settable ingredient containing

106715, 106721, 106738, 106792, 106817, C04B 713, C04B 1428

Patent

active

054783909

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The invention relates cuttable concrete adapted to be cut and sculpted with conventional sculpting tools during if desired several months as well as the process for production permitting its obtention and a process for molding permitting its use.


BACKGROUND OF THE INVENTION

It is well known that conventional concretes such as silicious concretes have, and this for an extremely short time, only a very slight capacity for being shaped after demolding. Because of this, the hardening times do not permit using complicated moldings for reworking. This very low capability for shaping requires the design and production of moldings or molds which are extremely sophisticated so as to permit reproductions of shape or of architectural molding. On the other hand, for economical reasons, it is very often necessary to consider the employment of framework or molds requiring series which, in the case of the ornamentation of facades, harden in repetitions of shaped modules.
In the field of concrete, there has already been used granulated limestone to give to the concrete individual characteristics different from those of silicious concretes.
Thus, the patent FR-A-2.520.349 describes a process for the production of an artificial or synthetic stone using successively the steps of: stone).
This artificial stone is distinguished from that of the invention by its content of silica and a hydraulic binder which do not permit slow hardening of the assembly as well as by the quantity of water which, in a just sufficient quantity, is equivalent to about 10% by volume of the total volume. Similarly, the molding process, which requires the drying of the product at a temperature of 35.degree. to 40.degree. C., differs from the molding process generally used in the framework of the present invention.
The patent FR-A-2.584.707 describes itself a process for production of a reconstituted limestone characterized by the fact that it consists in preparing a mixture of: before compacting by tamping within the molds, or by liquid pouring into the molds which are then vibrated manually or even mechanically. This process is distinguished from the invention by its step of vibrating which, in the case of the process of the invention, is strongly discouraged because it gives rise to segregation of the elements entering into the composition of the concrete rendering the latter useless for all shaping, demolding, cutting and sculpting in contrast to all the conventional processes in which the vibration gives rise to the binding of the various elements. This observation is applicable in the same way to the patent FR-A-2.414.028.
Finally, the patents FR-A-1.291.011 and 1.248.052 describe an artificial stone and an agglomerate which, although having similar compositions to those of the concrete of the present invention, do not have the essential characteristics of this latter by reason of the portions of the completely different components and of the lack of use of the specific limestones.


SUMMARY OF THE INVENTION

The object of the present invention is therefore to provide a cuttable concrete whose hardness and properties of mechanical resistance permit its use in a conventional concrete but which has the property of being adapted to be cut for several months with conventional sculpting tools.
Another object of the present invention is to provide a concrete whose composition is such to permit its use in coffering, in plastering, in facing stone, etc.
To this end, the invention has for its object a cuttable concrete adapted to be cut for several months by means of sculpting tools and in conventional cuts, characterized in that it is constituted by at least a mixture of a volume V of mineral materials present essentially in the form of crushed oolithic limestones, of a volume V1 less than V of carbonated binder preferably based on lime and/or cement, of a volume V3 of an excess of water.
According to a preferred embodiment of the invention, the sum of the volumes V and V3 represent 55 to 90% of the total volume of the mixture

REFERENCES:
patent: 452037 (1891-05-01), St. John
patent: 1805431 (1931-05-01), Ryder
patent: 2758033 (1956-08-01), Burney, Jr. et al.
patent: 3169877 (1965-02-01), Bartoli et al.
patent: 4026716 (1977-05-01), Urschel, III et al.
patent: 4613649 (1986-09-01), Saeki et al.

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