SK36196A3 - Two-step masonry impregnation water repelling method - Google Patents

Abstract

Making new or old masonry water repellent Impregnation of masonry to make it water repellant is effected in 2 steps by: (1) treating with a highly dispersed aqueous emulsion of (A1) an organoalkoxysilane and/or (A2), alkoxy group containing organosiloxane and (B) salts of water-soluble (in)organic acids and organopolysiloxanes, there being siloxane units monovalently attached to SiC groups containing basic N such that there is at least 0.5 wt. % basic N based on the organopolysiloxane wt.; and (2) treating with an aqueous solution of (C1) alkali silicate and/or alkali siliconate (C2) or mixture of alkali silicate and alkali siliconate in water.

Description

Technical field

The invention relates to a two-step process for impregnating a water-repellent masonry. In the first step, the masonry is treated with a water-diluted impregnating composition comprising an organoalkoxysilane and / or organosiloxane containing alkoxy groups and a water-soluble acid salt and an organopolysiloxane with SiC-bonded basic nitrogen residues. In a second step, the wall is treated with an aqueous solution of alkali metal silicates and / or alkali metal siliconates.

BACKGROUND OF THE INVENTION

Water-diluted preparations of organoalkoxysilane and / or organosiloxane containing alkoxy groups and salts of water-soluble acid and organopolysiloxane with basic nitrogen-containing residues bound by SiC-bond are microemulsions by which the masonry can be impregnated against water uptake. Such formulations rapidly secrete impregnating active ingredients in basic masonry. Old masonry, however, usually no longer shows any basicity. Even more slowly, the active impregnating substances are deposited in the old, moistened masonry. For example, the formulations diluted by the formation of the sealing layer against leaching upward, and in an unfavorable case, forming the sealing layer even further above the point where the masonry begins to dry.

water after injection at rising damp

US-A-5 250 106 describes the treatment of old and wet masonry with the previously described water-diluted impregnating agent and additionally with aqueous solutions of alkaline or alkaline earth hydroxides. In practice, however, the impregnating effect is too low, particularly in the removal of rising damp, in practice. Larger amounts of alkali metal or magnesium ions are not desirable in the masonry, as they may form flowering salts. Calcium hydroxide is too poorly soluble in water for use in masonry.

DE-A-42 20 684 discloses a method of rehabilitating old masonry and making a horizontal sealing layer against rising damp, in which holes are drilled into the masonry, a cement slurry is pressed and a silicate solution is injected into the still wet cement slurry.

The use of water-soluble alkali metal silicates, for example as described in GB-A-1 177 662 in combination with alkali metal siliconates, results in water-soluble, hygroscopic, alkali metal carbonates capable of flowering. If these alkali metal siliconates and alkali metal silicates are used as the only active ingredients, a large amount is required and therefore large amounts of alkali metal carbonates are formed. In the case of strong masonry, the access of CO ₂ from the air is very difficult to produce the active substance. Furthermore, the water-repellent effect of alkali metal silicates and alkali metal silicates is not sufficient.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a water-repellent impregnation method for masonry, in particular for eliminating rising damp, using water-diluted formulations, and which is particularly effective for old and wet masonry.

SUMMARY OF THE INVENTION

The invention relates to a method for water-repellent impregnation of masonry by treating masonry in a first step with a highly dispersed, water-emulsified impregnating composition comprising (A1) an organoalkoxysilane or (A2) an organosiloxane containing alkoxy groups or (A3) a mixture of organoalkoxysilane and organosiloxane groups a salt of a water-soluble organic or inorganic acid and an organopolysiloxane which, in addition to the other organosiloxane units, contains those siloxane units which exhibit monovalent, by means of a SiC bond, of at least 0.5% by weight of basic nitrogen based on organopolysiloxane; in a second step, the masonry is treated with a solution of (C1) an alkali metal silicate or (C2) an alkali metal siliconate or (C3) a mixture of an alkali metal silicate and siliconate in water.

When components (A), (B) and (C) are contacted in the masonry, the emulsion of the impregnating agent breaks down and the alkali metal silicate or alkali metal siliconate such as silicic acid or organosiloxane falls out. The active substance is deposited in the pores of the masonry immediately after the introduction of (C1) an alkali metal silicate or (C2) an alkali metal siliconate and hydrophobizes the masonry. The old wet masonry, like new, dry and alkaline masonry, is permanently impregnated against water uptake.

Indeed, the treatment of the masonry in the reverse order first with (C1) an alkali metal silicate or (C2) alkali metal siliconate and then with a highly dispersible, water-emulsified, impregnating agent brings worse water-repellent properties of the masonry. The impregnating composition is then immediately deposited near the location where the alkali metal silicate (C1) or alkali metal siliconate (C2) has been introduced and does not penetrate deep into the masonry.

The method is suitable for water-repellent impregnation of all kinds of masonry, for example brick masonry, iron reinforced and unreinforced concrete, aerated concrete, Rhine pumice stone, natural stone including limestone, gypsum, slag bricks and lime sand bricks.

The method is particularly suitable for deep impregnation of already wet old masonry. Preferably, the method of the invention is used to remove rising damp in the masonry, wherein said components (A1) or (A2) or (A3) and (B) and (C1) or (C2) or (C3) are injected into the masonry. In this case, the drilled holes are preferably made just above the ground level from the outside and / or from the inside into the masonry, preferably with an inward inclination. The drilled holes are preferably made at a distance of 5 to 20 cm, in particular 9-13 cm. In the case of masonry from a masonry thickness of 60 cm, preferably one row of boreholes from inside and one row of boreholes from outside.

An emulsion impregnation emulsion and an aqueous solution of (C1) an alkali metal silicate or (C2) an alkali metal siliconate are then first introduced into these wells as an injectable agent. The process can be carried out with or without pressure. Suitably, the same holes are used for both steps. The injectable composition may be filled into the openings, if necessary, by a pouring cone or by means of a storage container located above the borehole. The injected composition can also be pulsed into the holes by means of lancets. Preferably, the injectable composition is injected into the masonry by means of a pressure, preferably up to 3 MPa, in particular 0.5 to 2 MPa. In this case, insertion cartridges inserted into holes, called packers, are preferably used.

The masonry can be completely moistened where drilled holes have been drilled. Upon reaction of the impregnating agent and an aqueous solution of (C1) an alkali metal silicate or (C2) an alkali metal siliconate, a sealing layer is formed. Above it, the masonry dries up.

Inhomogeneous masonry and masonry with cavities such as quarry masonry, hollow bricks and masonry with incompletely filled joints are at risk of uncontrolled distribution of the injectable due to irregularity in the masonry. In the case of a masonry of this kind, the cement slurry for filling the voids is preferably injected prior to injection in the water-emulsified impregnating agent. Preferably, the finest ground cement, also referred to as microcement, is used. The previously unplastered masonry is preferably rubbed in the injection plane to prevent the precipitation of the cement slurry, the water emulsified impregnating agent and the aqueous solution (C1) of the alkali metal silicate or (C2) of the alkali metal siliconate.

After solidification of the cement slurry, the holes are re-drilled or a second series of holes is introduced above the row of cement injection grouting through which the impregnating agent emulsified in water and the aqueous solution of (C1) alkali metal silicate or (C2) alkali siliconate are introduced. metal. In a preferred embodiment, the cement slurry is injected with a packer. After the cement slurry has been poured, the packer is placed with a lancet-shaped preparation. The impregnating agent emulsified in water and an aqueous solution of (C1) an alkali metal silicate or (C2) an alkali metal siliconate are then mentioned.

Preferably, 15 to 200 minutes, in particular 30 to 60 minutes after the injection of the cement slurry, wait until the water-emulsified impregnating agent is introduced. The interval between the use of the water-impregnating agent and the aqueous solution of (C1) alkali metal silicate or (C2) alkali metal siliconate is preferably at least 120 minutes, especially 180 minutes, and preferably at most 5 days, especially 2 days.

The impregnating agent used may comprise an organoalkoxysilane (Al) or a mixture of several organoalkoxysilanes. The organoalkoxysilanes contain at least 1 and at most 3 hydrocarbon residues bound by the SiC- bond and at least 1 and at most 3 alkoxy residues. Preferably, the organoalkoxysilanes comprising (Al) 1 or 2 identical or different monohydric hydrocarbon radicals C _x - C ₁₅ bonded SiC bond, optionally substituted by halogen and the other radicals are identical or different alkoxy radicals -C, - C _g.

Examples of C 1 -C ₁₅ hydrocarbon radicals are alkyl radicals such as methyl, ethyl, η-propyl, isopropyl, n-butyl, isobutyl, tert. butyl, n-pentyl, isopentyl, neopentyl, tert. pentyl; hexyl radicals such as n-hexyl-; heptyl residues such as n-heptyl-; octyl residues such as octyl and isooctyl-like

2,2,4-trimethylpentyl; nonyl radicals such as n-nonyl-; decyl residues such as n-decyl-; dodecyl residues such as n-dodecyl-; alkenyl residues such as vinyl and allyl; cycloalkyl radicals such as cyclopentyl-, cyclohexyl-, cycloheptyl- and methylcyclohexyl-; aryl residues such as phenyl, naphthyl, anthryl and phenanthryl; alkaryl residues such as o-, m-, p-tolyl; xylyl residues such as ethylphenyl-; aralkyl radicals such as benzyl, and? -phenylethyl-.

Examples of halogen substituted hydrocarbon radicals ^C 1 ^'C 15 ⁱⁿ the alkyl radicals substituted by fluorine, chlorine, bromine and iodine, such as 3,3,3-trifluoro-n-propyl radical, 2,2,2,2,2,2 a hexafluoroisopropyl moiety, a heptafluoro-isopropyl moiety, and a haloaryl moiety such as an o-, m-, and p-chlorophenyl moiety.

Particularly preferred are the unsubstituted C 1 -C ₈ alkyl radicals and the phenyl radical.

Examples of alkoxy residues of the _{6 6} organoalkoxy silanes (Al) are methoxy-, ethoxy-, η-propoxy-, isopropoxy-, η-butoxy-, isobutoxy-, sec-butoxy- and tert-butoxy-, pentyloxy groups such as n-pentyloxy. and hexyloxy groups such as n-hexyloxy-. Methoxy- and ethoxy- residues are particularly preferred.

Alkoxy radicals may be substituted with halogen atoms, but this is not preferred.

The impregnating composition may comprise an organosiloxane (A2) containing alkoxy groups or a mixture of several organosiloxanes. Organosiloxanes are oligomeric or polymeric organosilicon compounds in which silicon atoms are bonded via oxygen atoms and contain organic residues bound by a SiC- bond. The organosiloxanes may additionally contain hydroxyl groups which facilitate binding to the masonry.

The organosiloxanes preferably exhibit a viscosity of at most 2000 mPa · s in order to guarantee a particularly good distribution on the pore area in the masonry.

Particularly suitable are organosiloxanes (A2) from the units of formula I

R _x Si (OR ¹ ) _y (OH) ₂ O ₄ . _x . _y . _of (I), wherein:

R is the same or different monovalent hydrocarbon residues

- C ₁₅ , optionally substituted with halogen, bound by an S 1 C- bond,

R ¹ identical or different alkyl radicals mono- C ^ - C _6, x 0, 1, 2 or 3, on average 0.9 to 1.8, y 0, 1, 2 or 3, on average 0.01 to 2.0 and 0.1, 2 or 3, on average 0.0 to 0.5, provided that the sum of x, y and z is at most 3.5.

Preferably, the organosiloxane (A2) has a viscosity of at most 300 mPa.s. Most preferred are organosiloxanes (A2) having a viscosity of from 5 to 100 mPa.s. Examples of hydrocarbon radicals C ₃ - C ₁₅ already above for the organoalkoxysilanes (Al) said hydrocarbyl radicals - C ₁₅ hydrocarbon radicals and C 15 halogen-substituted ^C. Especially preferred are unsubstituted alkyl residues - c _g, and a phenyl radical.

Although not mentioned in the aforementioned formula, part of the radical R may be replaced by a hydrogen atom bonded directly to the silicon atom. However, this is not preferred.

Examples of the radicals R ¹ are methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl and tert-butyl. butyl, pentyl radicals such as n-pentyl and hexyl radicals such as η-hexyl, methyl and ethyl radicals being particularly preferred.

Particularly preferred organosiloxanes (A2) are those obtained by the reaction of methyltrichlorosilane and alkyltrichlorosilane

- Cg, or phenyltrichlorosilane with methanol or ethanol in water.

In the process according to the invention, it is preferable to use salts (B) which are obtained from polysiloxanes built up from units of the general formula II

R _a ² R b ³ (OR ⁴ ) c SiO ₄ - _a . _b - _c (II) where:

R ² identical or different monohydric hydrocarbon radicals C

- C ₁₅ , not containing basic nitrogen, bound by a SiC- or hydrogen bond,

R ³ identical or different radicals mono- basic nitrogen-bonded SiC bond,

R ^{4 is} hydrogen or the same or different alkyl radicals - C ₄ , and 0, 1, 2 or 3, on average 0 to 2, in particular 0 to 1.8, b 0 or 1, on average 0.1 to 0.6, especially 0 15 to 0.30 and 0, 1, 2 or 3, on average 0.1 to 0.8, in particular 0.2 to 0.6.

Preferably, the sum of the given mean values a, b and c is at most 3.4. The viscosity is preferably 1 to 2,000, in particular 10 to 100 mPa.s.

Preferably, a hydrocarbon radical, in particular a methyl radical, is also bonded to each of the silicon atoms to which hydrogen is bound.

Examples of the hydrocarbon groups C ^ - C ₁₅ already above for the organoalkoxysilanes (Al) said hydrocarbyl radicals - C _15th

Methyl and phenyl are particularly preferred.

Preferred radicals R ³ are those of formula (III)

R ⁵ ₂ NR ⁶ (III) in which R

R ⁵ is hydrogen or the same or different - C ₁₅ alkyl or ^C 1 ^C 15 aminoalkyl radicals

R ^{6 is a} dihydric hydrocarbon radical C 1 -C ₁₈ .

The foregoing examples of alkyl radicals for R ² also apply to R 8. When R ^{5 is an} aminoalkyl radical - C ₁₅ , its amino group preferably carries two hydrogen atoms.

Preferably, at least one hydrogen atom is bonded to each nitrogen atom of the preceding formula.

Examples of the divalent hydrocarbon radicals R @ ⁶ are saturated alkylene radicals such as methylene and ethylene, and further propylene, butylene, pentylene, hexylene, cyclohexylene and octadecylene or unsaturated alkylene or arylene radicals, such as hexenylene and phenylene; n-propylene residue is preferred.

Preferred examples for the radicals R ³ are:

h ₂ n (ch ₂ ) ₃ _ h ₂ n (ch ₂ ) ₂ nh (ch ₂ ) ₂ _ h ₂ n (ch ₂ ) ₂ nh (ch ₂ ) ₃

H ₂ N ( ^c H ₂ ) ₂ h ₃ cnh (ch ₂ ) ₃ _ c ₂ h ₅ nh (ch ₂ ) ₃ _ h ₃ cnh (ch ₂ ) ₂ _ c ₂ h ₅ nh (ch ₂ ) ₂ _

H ₂ N ( ^c H ₂ ) ₄

H ₂ N ( ^c H ₂ ) ₅ _h (nhch ₂ ch ₂ ) ₃ _

C ₄ H _g NH (CH ₂ ) ₂ NH (CH ₂ ) ₂ _cyclo-C ₉ H ₁₁ NH (CH ₂ ) ₃ _ cyclo-C 8 H ₁₁ NH (CH ₂ ) ₂ _ (ch ₃ ) ₂ n (ch ₂ ) ₃ _ (ch ₃ ) ₂ n (ch ₂ ) ₂ _ (c ₂ h ₅ ) ₂ n (ch ₂ ) ₃ _ (c ₂ h ₅ ) ₂ n (ch ₂ ) ₂ _

Examples of radicals R ⁴ are as previously radicals R ¹ the alkyl moieties - C _4. Methyl and ethyl radicals are particularly preferred.

Suitable for the preparation of the salt (B) are all water-soluble organic and inorganic acids which, in the form of their salt, behave chemically inert with respect to the other components of the impregnating agent. Examples of such acids are hydrochloric, sulfuric, phosphoric, acetic and propionic acids. Acetic acid and propionic acid are preferred.

In addition to the alkoxysilane (A1) and / or organosilane (A2) and the water-soluble organic and inorganic acid salt (B) and organopolysiloxane (D), the impregnating agent may contain monomeric and / or polymeric esters of silicic acid with C _x -C ₆ alkoxy residues and a viscosity of not more than 20 mPa.s. One particular silica ester or a mixture of different silica esters may be used.

Preferred esters of the silica containing alkoxy radicals and ^C 3 ^{and C} have a viscosity of from 1 to 5 mPa.s.

Examples of preferred silicic esters are tetramethylsilicate, tetraethylsilicate and tetraisopropylsilicate.

The impregnating compositions preferably contain from 20 to 80% by weight of organoalkoxysilane, in particular from 35 to 55% by weight of organoalkoxysilane (Al).

The preferred amount of organosiloxane (A2) in the impregnating compositions is 5 to 80% by weight, in particular 10 to 30% by weight.

The weight ratio of alkylalkoxysilane (A1) to organosiloxane (A2) in the impregnating compositions is sufficient from 0: 1 to 1: 0, but is preferably from 2: 1 to 10: 1.

The impregnating compositions preferably contain 5 to 50% by weight, in particular 15 to 30% by weight of salt (B).

If the impregnating compositions additionally contain silicic acid esters (D), the amount thereof is at most 30% by weight, preferably 5 to 15% by weight.

The salt (B) serves as an emulsifier for components (A1), (A2) and optionally (D).

The impregnating agents are diluted with water in the preparation in a weight ratio of 1: 4 to 1: 30, preferably 1: 11 to 1: 14, and are used as finely divided emulsions, preferably as microemulsions.

The impregnating agents may contain, in addition to the above-described ingredients, fungicides, bactericides, algicides, microbicides, flavoring agents, corrosion inhibitors and antifoaming agents as additives. The impregnating compositions contain the additives preferably in an amount of from 0.001 to 1% by weight, in particular from 0.01 to 0.1% by weight.

The alkali metal silicates (C1) and the alkali metal siliconates (C2) to be used in the second process step are preferably constructed from units of formula IV

M _d ^{R 7} Si 0 ₄ _ _d

- (IV) where

Sodium or potassium atoms,

R ⁷ identical or different monohydric hydrocarbon radicals C ₁₅ C, SiC-bonded bond, d 0, 1, 2 or 3, on average 0.5 to 2.2, especially 0.8 to 1.5 and e 0, 1, 2 or 3, an average of 0 to 2.0, in particular 0 to 1.5, provided that the sum of the given average values of dae is at most 3.0.

Examples of the radicals R ⁷ are the alkyl radicals C 1 -C ₆ mentioned above for the radicals R ¹ . Particularly preferred are methyl, ethyl, n-propyl and isopropyl.

When all units of formula (IV) have a value of 0, it is an alkali metal silicate (Cl). The sodium and potassium salts of silicic acids are also referred to as water glass.

The alkali metal silicates preferably have a SiO ₂ : M ₂ O molar ratio of from 8.0 to 0.5, in particular from 5.0 to 1.5.

The concentrations of the aqueous solutions of alkali metal silicates (C1) and alkali metal siliconates (C2) or mixtures thereof (C3) used in the second process step are preferably 0.5 to 20% by weight, in particular 2 to 10% by weight.

Preferably, in a second step, an organoalkoxysilane, an organosiloxane containing alkoxy groups (A2) and salts (B) of 0.05 to 3, in particular 0.2 to 1, by weight of the sum of the alkali silicates metals (C1) and alkali metal siliconates (C2), always calculated as anhydrous substances.

Throughout the text, unless otherwise stated

(a) the quantity data refer to weight

b) all pressures are 0.10 MPa (abs.),

(c) all temperatures are 25 ° C;

(d) all viscosity data refer to a temperature of 25 ° C.

DETAILED DESCRIPTION OF THE INVENTION

Manufacture of impregnating agent

Production of organosiloxane (A2)

In a continuously operated reaction apparatus, a mixture of 2 parts by weight of methyltrichlorosilane and 1 part by weight of iso-octyltrichlorosilane is reacted with a mixture of 1 part by weight of water and 2 parts by weight of methanol to give a hydrolyzate having a viscosity of 14 mPa.s.

Salt production (B)

To a 1 L 3-necked flask equipped with a stirrer, a separating funnel and a reflux condenser was added with stirring to a mixture of 0.2 g KOH in 4 g methanol and 500 g organopolysiloxane of the formula

CH ₃ Si (OC ₂ H ₅ ) _{0 · 8} O 1 _fχ having an average molecular weight of about 600 g / mol and a viscosity of about 20 mPa.s 150 g of N- (2-aminoethyl) -3-aminopropyltrimethoxysilane and the mixture thus obtained is heated hours to reflux. It is then cooled to 30 ° C and treated with 2.5 ml of 10% hydrochloric acid. By heating up to 140 ° C, methanol is finally distilled off and the salt (B) thus obtained is freed from KCl by filtration. Salt (B) contains 2.9% basic nitrogen, based on its weight.

Manufacture of impregnating agent

24.2 parts by weight of the first described salt (B) are successively mixed with 6 parts by weight of glacial acetic acid, 45.6 parts by weight of isooctyltrimethoxysilane, 13.8 parts by weight of tetraethyl silicate and 10.4 parts by weight of the organosiloxane (A2) described above, and Heat at 90 ° C for 5 hours to give a clear solution. After cooling, the impregnating agent obtained is diluted with water in the amount indicated in the following examples. Highly dispersed, transparent mixtures are obtained.

Production of alkaline solution

000 g of potassium water glass with a SiO ₂ 28% by weight and a pH of 13 was mixed with 3 1 of water, 300 ml 50% by weight aqueous solution of KOH and 800 g of an aqueous solution of káliummetylsilikonátu containing 20% silicon and 15% KOH. The pH of the clear mixture was 13.02.

Example 1 (comparative example)

The rising moisture of the 75 cm thick old limestone wall of a quartz stone bound by lime mortar is provided with a horizontal row of drilled holes at a distance of about 10 to 12 cm. The moisture content of the mortar is 9 to 10% by weight.

Drill holes were injected at first 5 L and after 2 hours a further 5 L per running meter of masonry of the above-described impregnating agent diluted 1: 5 with water.

After 11 weeks, the moisture content of the mortar is determined 15 cm below and above the level of injection. The content is below the injection plane: 9.89% by weight above the injection plane: 7.65% by weight.

Example 2 (comparative example)

Into the masonry described in Example 1, 5 l is first injected per meter of masonry of the alkaline solution described above. After 2 hours, an additional 5 L is injected per meter of masonry of the impregnating agent produced as above diluted 1: 5 with water.

After 11 weeks, the moisture content of the mortar is determined 15 cm below and above the level of injection. Content is below the grouting plane: above the grouting plane:

6.89% by weight 12.91% by weight.

Example 3 (according to the invention)

The masonry described in Example 1 is first injected with 5 liters per meter of masonry of the impregnating composition made as above diluted 1: 5 with water. After 2 hours, an additional 5 liters per meter of masonry of the alkaline solution described above is injected.

After 11 weeks, the moisture content of the mortar is determined 15 cm below and above the level of injection. The content is below the injection plane: 11.06% by weight above the injection plane: 3.73% by weight.

Example 4 (according to the invention)

The masonry described in Example 1 is first injected with 5 L of an impregnating composition made as above diluted 1: 10 with water per running meter of masonry. After 2 hours, an additional 5 L of the above-described alkaline solution is injected per running meter of masonry.

After 11 weeks, the moisture content of the mortar is determined 15 cm below and above the level of injection. Content is below the grouting plane: above the grouting plane:

10.29% by weight 1.14% by weight.

Claims (7)

A method of water repellent impregnation of masonry by treating the masonry in a first step with a highly dispersed, water-emulsified, impregnating composition comprising (A1) an organoalkoxysilane or (A2) an organosiloxane containing alkoxy groups or (A3) a mixture of organoalkoxysilane and organosiloxane containing (alkoxyl) a salt of a water-soluble organic or inorganic acid and an organopolysiloxane which, in addition to the other organosiloxane units, contains those siloxane units which exhibit monovalent, by means of a SiC bond, of at least 0.5% by weight of basic nitrogen relative to the organopolys iloxane in a second step, the masonry is treated with a solution of (C1) an alkali metal silicate or (C2) an alkali metal siliconate or (C3) a mixture of an alkali metal silicate and siliconate in water. The process according to claim 1, wherein the organoalkoxysilanes (A1) have 1 or 2 identical or different monovalent hydrocarbon radicals - C ₁₅ bonded by a SiC- bond, optionally substituted by halogen, and the other radicals are the same or different alkoxy radicals C 1 -C ₆ . The method according to claim 1 or 2, wherein the organosiloxanes (A2) consist of units of formula I (I), R _x S ⁱ (O ^{R 1)} y (OH) _z O ₄ - _x -y- _z where: R is the same or different monovalent hydrocarbon radicals - C ₁₅ , optionally substituted with halogen, bound by a SiC- bond, R ¹ identical or different alkyl radicals mono- - C _6, x 0, 1, 2 or 3, on average 0.9 to 1.8, y 0, 1, 2 or 3, on average 0.01 to 2.0 and 0, 1, 2 or 3, on average 0.0 to 0.5, provided that the sum of x, y and z is at most 3.5. Process according to any one of claims 1 to 3, wherein salts (B) which are obtained from acids and polysiloxanes built from units of the general formula II are preferably used. R _a ² R b ³ (OR ⁴ ) csi Q ₄ -a- _b - _c (II), where: R ² identical or different monohydric hydrocarbon radicals C - C ₁₅ , not containing basic nitrogen, bound by a SiC- or hydrogen bond, R ³ identical or different radicals mono- basic nitrogen-bonded SiC bond, R ^{4 is} hydrogen or the same or different C ₁ -C ₄ alkyl radicals, and 0, 1, 2 or 3, on average 0 to 2, in particular 0 to 1.8, b 0 or 1, average 0.1 to 0.6, in particular 0.15 to 0.30 and c 0, 1, 2 or 3, on average 0.1 to 0.8, in particular 0.2 to 0.6. The process according to any one of claims 1 to 4, wherein the alkali metal silicates (C1) and alkali metal siliconates (C2) used in the second step are built up from units of formula IV M _d R _e ⁷ Si 0 _{4 d d e} (IV), where is Sodium or potassium atoms, R ⁷ identical or different monovalent hydrocarbon radicals - C ₁₅ , bonded by a SiC- bond, d 0, 1, 2 or 3, on average 0,5 to 2,2, in particular 0,8 to 1,5 and e 0, 1, 2 or 3, on average 0 to 2.0, in particular 0 to 1.5, provided that the sum of the given average values of dae is at most 3.0. The method according to any one of claims 1 to 5, wherein in the second step an organoalkoxysilane, an organosiloxane containing alkoxy groups (A2) and salts (B) of 0.05 to 3 parts by weight are used for the proportion by weight of the sum of the components used in the first step (A1). the sums of alkali metal silicates (C1) and alkali metal siliconates (C2), always counted as anhydrous substances. The method according to any one of claims 1 to 6, wherein the rising moisture in the masonry is removed by injecting said components (A1) or (A2) or (A3) and (B) and (Cl) or (C2) or (C3) into the masonry. .