PT84834B - APPROPRIATE DRYING PROCESS OF SLIDES - Google Patents

Abstract

1. Process for drying masonry by electro-osmosis and electro-phoresis, which consists in placing, in the masonry, in holes provided for this purpose, wall electrodes connected to electrodes planted in the soil, but without an external current source, of filling the holes for the wall electrodes with a phoresis liquid based upon silica and, after total absorption of this liquid, of coating the wall electrodes with a mortar of phoresis powder based upon graphite, this process being characterized in that the phoresis liquid is a solution of colloidal silica, in that the period of gelling of the phoresis liquid is acted upon by modulation of its pH value achieved by the addition of ionisable salts, and in that the phoresis powder comprises, notably, more than 15% by volume of graphite in the form of absorbent micronized powder.

Description

improved process of the present invention concerns electron mose drying of masonry.

French patent number 1,508,872 filed on January 14, 1967 by Jakob Trabes, describes a process for drying masonry by electrosmosis according to which a series of electrodes are introduced into the masonry by means of an electrical conductor whose end is connected to a voltage source and to be dried and are connected according to which, it performs an electrophoresis or osmosis, if section, by using the electrodes introduced in a filling or sealing product.

that support this process

1) in parallel electro-injection molding

It is easy to understand that, thanks to what is already known, two different electrode effects are combined, capillaries from which electrosmosis allows, thanks to the implantation to invent the current produced by rising water.

Electrophoresis completes the migration through masonry, water, ionized particles from solid or liquid foresis products, flexible plastics suitable for electrodes to be housed in them. The manufacture of these sheaths is particularly delicate.

electrosmosis thanks to the direction of displacement wrapped in sheaths and placed in the masonry, in the area of fu-4 even to some

According to another process by the holder of the present patent application, electrodes are applied that are implanted but without an external source of electrical current, drilled holes where

a direct filling at low pressure, liquid foresis, powder mortar for suppression of the pot source applied the wall electrodes with a dressing the wall electrodes with a

According to this process, rese.

tension is possible thanks to the obtaining of a sufficient difference between the wet wall and the hot wet seal and the conductivity of the copper electrodes reduced by the foresis mortar.

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This invention proposes to introduce perfectly into the process just described, offering | leading to much higher results, particularly as a result of considerably comparative conductivity

I more.

In this way, the present invention has for its object a drying process of masonry by electrosmosis and electrophoresis that consists of applying to the masonry a wall electrode that is implanted in the ground, in making the filling of the holes where they are introduced the wall electrodes with a foresis liquid and after its total absorption, the wall electrodes are coated with a foresis powder mortar, this process being characterized by the foresis liquid being a colloidal silica solution and by the for example, more than 15% by volume of graphite may be comprised in the form of a wettable micronized powder.

-5 The liquid of foresis used in the characteristic process of the present invention is therefore a solution of colloidal silica which is in the form of milky or slightly opalescent dispersions of silica particles whose specific surface per gram of solution has a value of the order of 85 m2.

Dry matter is 10% minimum according to and the pH at 20 ° C is 9.9.

invention, the content of

Those of this liquid foresis are the following physico-chemical properties:

its capacity in any proportion, is a very favorable dilution element in water as it contributes to its homogeneous and deep diffusion within the wet masonry where it was applied;

- remains stable in the presence of organic or mineral acids up to pH3;

- the addition of ionizable salts such as NaCl or NaSO4 tends to transform the solution into a gel, depending on the pH and temperature, as will be explained in due course.

When applied in the well-known masonry drying process, combining electrosmosis and electrophoresis, the silica particles suspended in the phoresis liquid will migrate towards the wall to

the soil and will agglomerate in the narrow or curved areas of the masonry capillaries, thus forming true plugs that will thus prevent any water rising from the soil to the wall.

Finally, the foresis liquid according to the present invention has a remarkable characteristic of being transformed into a gel (fast gel) according to our will in the more or less long term, by modulating the pH, this modulation being obtained by the addition of ionizable salts. The single figure in the attached drawing shows the curve of variation of the time of transformation into gel as a function of pH. In this way, to fill the capillaries of the thin walls, making the wall pH neutral through the addition of salts, for example CINa, the result is obtained after 6 hours, necessary and sufficient time to obtain adequate penetration. . On the contrary, in thick walls the time of transformation into gel can be up to 130 hours or more, raising the pH to 8.5. This will result in a very important penetration of the foreseen liquid into the wall to be dried.

The choice of strength powder composition, which is the subject of the present invention, responds in particular to the following requirements:

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- obtaining a composition capable of allowing the preparation of a special mortar suitable for fixing the copper electrodes to the walls;

obtaining a composition capable of allowing the preparation of a mortar sufficiently conductive to not weaken the action of the electrodes;

- obtaining a mortar that can be pumped in order to ensure a fast and regular filling of the holes where the electrodes are applied.

These considerations led the inventor to propose the use of a phoresis powder with the following composition:

Graphite (wettable micronized powder .. more than 15% Perlite ............. in volume ....... of 22 48% by volume - Tricalcical alumina. ...... from 4 to 8% by volume - Micronized pozzolana (Trass) .from 8 to 12% by volume - Micronized silex .. ........ from 6 to 9% by volume - Copper sulphate .... ....... of 0.4 0.6% by volume - Fluidifying ....... ....... of 0.2 0.4% by volume - white cement ...... 4% by volume

This phoresis powder is essentially characterized by having a considerably higher conductivity than the currently used phoresis powders.

It is evident that the present invention is not limited to the examples of embodiments presented here, but on the contrary encompasses all variants.

Claims (4)

CLAIMS there. - Masonry drying process by electrosmosis and electrophoresis, which consists of applying mural electrodes in the laundry room that are connected to electrodes that are implanted in the soil, but without an external source of electrical current, when filling. the holes where the wall electrodes are inserted with a foresis liquid and, after its total absorption, the wall electrodes are coated with a foresis powder mortar, characterized in that the foresis liquid is a colloidal silica solution and for the foresis powder comprises, for example, more than 15% by volume of graphite in the form of a wettable micronized powder. 2§. - Process according to claim 1, characterized in that the said colloidal silica solution is in the form of a milky or slightly opalescent dispersion of silica particles whose specific surface per gram of solution has an order value 2 dem of the 85 m. 3rd. Process according to any one of the preceding claims, characterized in that the dry matter content of the solution is at least 10%. 4th. Process according to any one of the preceding claims, characterized in that it acts on the time of transformation of the foresis liquid into a gel by modulating its pH carried out by the addition of ionizable salts. -105â. Process according to any one of the preceding claims, characterized in that the foresis has the following composition: Graphite (wettable micronized powder) .. plus 15% by volume Perlite ........................... Tricalcium alumina ............... Micronized pozzolana (trass) ...... Micronized silex ................. Copper sulphate .................. in 22 to 4 8% in volume in 4 a 8% in volume in 8 to 12% and m volume in 6th to 9% in volume in 0.4 to 0, 6 in volume Fluidifier from 0.2 to 0.4 by volume White cement .................. 4% by volume