ES2255382A1 - Production of a high strength mortar comprises mixing of cement with crushed marble colouring and dehydration agents and water, for vibratory moulding and fixing - Google Patents

Abstract

The production of a high-strength mortar consists of mixing of high-hardness cement with crushed marble rock, colouring agent, a dehydration agent and water. Vibration of the mix in a mould with holding at room temperature is followed by storage with continuous hydration of the moulded product and application of a fixing agent to the visible surfaces of the product.

Description

Procedure for obtaining a high mortar resistance.

Object of the invention

The present invention relates to a procedure for obtaining a high strength mortar and degraded appearance, from crushed marble stone and to mortar obtained according to said procedure, for use in the construction and / or reconstruction of cornices, facades, lintels, pillars, terrazzo and outdoor tiles.

Background of the invention

In the construction sector it is necessary that the constructive elements comply with a series of resistance and stability requirements, which appear reflected in the quality standards of that sector. For another On the other hand, there is a need to provide such elements and that, in their instead, present a texture with a degraded, old appearance. The latter is due to the fact that, in the construction and / or reconstruction of facades and other ancient architectural elements, it is desired Respect the design and appearance they originally had.

So, to provide a solution of commitment in relation to the quality and aesthetics of construction materials, it would be advantageous to get a mortar that, on the one hand, have high strength and stability and, for another, its appearance presents a degraded, ancient appearance.

Description

In this sense, according to a first aspect, the The present invention provides a method of obtaining a high strength mortar and degraded final appearance, starting of crushed marble stone, comprising the stages of:

a) obtain a water-based mortar, cement High strength, marble dust, crushed marble stone, with a particle size between 1 and 6 mm, a dye powder and a water repellent agent;

b) impregnate the surfaces of the walls interiors of a mold with a mixture of acrylic resin, water and powder coloring and then pour the mortar into the mold impregnated until filled;

c) apply, to the mold with the mortar, a low frequency vibration, manually or mechanically;

d) store at room temperature, between 8 and 24 h, obtaining a molded mortar;

e) unmold the mortar and subsequently store the demolished mortar, continuously hydrating it, between 48 and 72 h and at room temperature, and

f) apply a fixative, which comprises a material polymer and water, on the exposed surfaces of the mortar and then keep at rest between 5.5 and 6.5 h, at room temperature.

A type of cement is used in the procedure very resistant white, the cement BL I 52.5 N. However, it you can use any other type of quality cement Similary.

According to a preferred embodiment of the invention, in stage a), crushed marble stone with a size is used of particle between 3 and 5 mm.

According to another preferred embodiment, in step b), the impregnation mixture comprises between 30 and 40%, by weight, of Water.

According to a preferred embodiment, the vibration is applied manually, using a metal rod, which apply in the mortar in a vertical direction and at a frequency between 30 and 40 r.p.m. This frequency is very low and it must be so that the mixture does not compact excessively. Of what on the contrary, undesirable defects in the texture of the expensive faces of the final mortar. Similarly, it can be applied mechanical vibration at a reduced penetration rate in the mortar.

According to a second aspect of the invention, provides a mortar obtainable by the procedure previously described.

The invention will now be described, only by way of illustrative, by way of the following example that in no way should be considered as limiting the scope of the invention.

Example of embodiment of the invention

In the procedure a white cement is used, of type BL I 52.5 N, very resistant and marble stones crushed The steps of the procedure are exposed to continuation.

A mortar is prepared, mixing 50 kg. from high strength white cement, 80 kg of marble dust, 110 kg of crushed marble stone, with a particle size average 3.5 mm, water, 400g of yellow powder and 5 ml of a water repellent agent. In this embodiment, the dye is Add to the wet mix.

Then, to achieve the desired effect of degraded stone (old), on the faces seen from the mortar, is manually impregnate, by brush, the surfaces of the walls interiors of a mold, with a mixture comprising a resin acrylic, water and green-yellow powder coloring. The impregnation mixture contains 35% by weight of water. When the mold is impregnated with the resin, the part is repelled of the mortar composed of fines (cement and marble dust), leaving a part of the crushed marble in sight, between 1 to 6 mm. In this way, the texture of the faces seen looks like degraded stone In addition, the resin layer is achieved Acrylic and dye embed a few microns inside the mortar, avoiding so that it is only superficial.

After impregnating, the mortar is poured prepared in the mold.

Subsequently, a vibration of very low frequency to the mold that contains the mortar, by means of a metal rod that moves vertically throughout the mortar, so that it does not compact too much. Vibration frequency employee is 35 r.p.m.

Then, it is stored at room temperature for  about 15 hours, obtaining a molded mortar. At this stage, the mortar begins to set and increases its consistency gradually. Then, the mortar is demoulded and Store at room temperature. In this last storage the Demolished mortar is hydrated continuously, during a 48 hours time.

Finally, a fixator, the which comprises a mixture of acrylic resin and water, on the surfaces seen from the mortar and left at rest at temperature atmosphere, for 6 hours. A fixative layer is reached between 1 and 2 microns.

Claims (5)

1. Procedure for obtaining a mortar of high resistance and degraded appearance, from crushed marble stone, characterized in that it comprises the steps of: a) obtain a water-based mortar, cement High strength, marble dust, crushed marble stone, with a particle size between 1 and 6 mm, a dye powder and a water repellent agent; b) impregnate the surfaces of the walls interiors of a mold with a mixture of acrylic resin, water and powder coloring and then pour the mortar into the mold impregnated until filled; c) apply a low frequency vibration to the mold with the mortar, manually or mechanically; d) store at room temperature, between 8 and 24 h, obtaining a molded mortar; e) unmold the mortar and subsequently store the demolished mortar, continuously hydrating it, between 48 and 72 h and at room temperature, and f) apply a fixative, which comprises a material polymer and water, on the exposed surfaces of the mortar and then keep at rest between 5.5 and 6.5 h, at room temperature. 2. Method according to claim 1, characterized in that, in step a), crushed marble stone having a particle size between 3 and 5 mm is used. 3. Method according to any of claims 1 and 2, characterized in that, in step b), the impregnation mixture comprises between 30 and 40%, by weight, of water. Method according to any one of claims 1 to 3, characterized in that the vibration is applied manually, by means of a metal rod, in a vertical direction and at a frequency between 30 and 40 rpm. 5. Mortar obtainable by a procedure according to claims 1 to 4.