SK282990B6 - A two-step process for the water-repellent impregnation of masonry - 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-stage 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 organopolysiloxane with basic nitrogen-containing residues bound by SiC-. 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 has any basicity. Even more slowly, effective impregnating agents are deposited in the old, overwrought masonry. For example, formulations diluted with water after injection to form a sealing layer against rising damp are leached upwards and, in an unfavorable case, form a sealing layer even further above the point where the masonry begins to dry.

US-A-5 250 106 describes the treatment of old and wet masonry with a previously described water-diluted impregnating agent and additionally 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. When these alkali metal siliconates and alkali metal silicates are used as the only active ingredients, a large amount thereof is required and therefore large amounts of alkali metal carbonates are formed. In the case of thick 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 siliconates 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 the removal of rising damp in which water-based formulations are used and which is particularly effective for old and wet masonry.

SUMMARY OF THE INVENTION

The present invention relates to a method of water-repellent impregnation of masonry by treating the masonry in a first step with a highly dispersible, water-emulsified impregnating composition comprising:

Al. organoalkoxysilane or

A2. an organosiloxane containing alkoxy groups, or A3. a mixture of organoalkoxysilane and organosiloxane containing alkoxy groups; and

B. a salt of a water-soluble organic or inorganic acid and an organopolysiloxane which, in addition to other organosiloxane units, contains those siloxane units having monovalent, SiC-bonded residues with basic nitrogen in an amount of at least 0,5% by weight of basic nitrogen, weight of organopolysiloxane, wherein in the second step the masonry is treated with the solution: Cl. an alkali metal silicate; or

C2. an alkali metal siliconate; or

C3. mixtures of alkali metal silicate and siliconate in water.

When the 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.

Treating the masonry in reverse order, first with (C1) an alkali metal silicate or (C2) alkali metal siliconate and then a highly dispersible, water-emulsified, impregnating agent, results in poorer 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 non-reinforced concrete, aerated concrete, Rhine pumice stone, natural stone including limestone, gypsum, slag bricks and sand-lime 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 drill 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 from 5 to 20 cm, in particular from 9 to 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. Advantageously, insertion cartridges inserted into holes, called packer, are 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.

In the case of non-homogeneous masonry and masonry with cavities such as quarry masonry, hollow bricks and masonry with incompletely filled joints, there is a risk of uncontrolled distribution of the injectable due to irregularities in the masonry. In the case of a masonry of this kind, the cement slurry is preferably injected before the water-emulsified impregnating agent is injected to fill the voids. Preferably, the finest ground cement, also referred to as microcement, is used. The previously unplastic masonry is preferably rubbed in the injection plane to prevent the build-up of the cementitious suspension, 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, especially 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-emulsion 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 (Al) 1 or 2 contain the same or different monovalent C 1 -C 15 hydrocarbon radicals bonded by a SiC- bond, optionally substituted by halogen, and the other radicals are the same or different C 1 -C ₁₈ alkoxy radicals.

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 residues such as n-hexyl-; heptyl residues such as n-heptyl-; octyl residues such as octyl and isooctyl- such as 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 D-phenylethyl-.

Examples of halogen substituted hydrocarbon radicals C1-C4; - those ₅ are alkyl radicals substituted by fluorine, chlorine, bromine and iodine atoms such as 3,3,3-trifluoro-n-propyl radical, 2,2,2,2,2,2-hexafluoroisopropyl radical, heptafluoro-isopropyl radical and haloaryl radicals such as o-, m- and p-chlorophenyl radicals.

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

Examples of alkoxy radicals of ω-C ₆ organoalkoxysilanes (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 through oxygen atoms and contain organic residues bonded by a SiC- bond. The organosiloxanes may additionally contain hydroxyl groups which facilitate binding to the masonry.

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

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

R ^ OR'j / OH ^ O ^ (D where:

R is the same or different monovalent hydrocarbon radicals C1-Cu, optionally substituted by halogen, bound by a SiC- bond,

R ^{1 is the} same or different monovalent C ₁ -C ₆ alkyl radicals, 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 not more than 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 for C 1 hydrocarbon residues - C ₁₅ are hydrocarbon residues C 1 already mentioned for organoalkoxysilanes (Al); - C ₁₅ hydrocarbon radicals, and C] - C ₁₅ halogen-substituted. Particularly preferred are the unsubstituted alkyl residues - C _8, and the 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 C ₁ -C ₈ alkyltrichlorosilane, or phenyltrichlorosilane with methanol or ethanol in water.

In the process according to the invention, preference is given to using salts (B) obtained from polysiloxanes built up from units of formula (II)

R ² _and R b ³ (OR ⁴⁾ ₄ CSIOs _ _and _ "_ _c (H).

where it means:

R * the same or different monovalent hydrocarbon radicals C 1-6; to C | ₅ , 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, 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 c of 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 hydrogen atom to which hydrogen is bound.

Examples of C ₁ -C ₁₅ hydrocarbon residues are already mentioned for the C ₁ -C ₁₅ organoalkoxysilanes (Al) | - C ₁₅ . Methyl and phenyl are particularly preferred.

As zvyškv R ³ are the preferred radicals of formula (III):

R2 _< ^{5 >} NR < ⁶ >

R ^{5 is} hydrogen or the same or different C 1 -C ₁₅ alkyl or C 1-6 alkyl - C ₁₅ aminoalkyl radicals

R ⁶ dihydric hydrocarbon residue ₈ .

The foregoing examples of alkyl radicals for R ² also apply to R ⁵ . When R @ ⁵ is C1 -C15 aminoalkyl, 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, propylene, butylene, pentylene, hexylene, cyclohexylene and octadecyl or unsaturated alkylene or arylene radicals, such as hexenylene, 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 (CH 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 (CH ₂ ) ₄ . H ₂ N (CH ₂ ) ₅ . H (NHCH ₂ CH ₂ ) ₃ .

C ₄ H ₉ NH (CH ₂ ) ₂ NH (CH ₂ ) ₂ . Cyclo-CsHuNHjCHjjj. cyclo-C ₆ 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 ) _s . (C ₂ H ₅ ) ₂ N (CH ₂ ) ₂ .

Examples of radicals R ⁴ is as R ¹ radicals the alkyl radicals C, - 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 composition may contain monomeric and / or polymeric esters of silicic acid with C 1 -C ₆ alkoxy residues; 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 C ₃ - C ₃ and 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 fine particle emulsions, preferably as microemulsions.

The impregnating agents may contain, in addition to the components described above, fungicides, bactericides, algicides, microbicides, flavoring agents, corrosion inhibitors and antifoams 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.Re’SiO ^ (IV) where it means

Sodium or potassium atoms,

R ^{7 the} same or different monovalent hydrocarbon radicals C 1 -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.

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 e is 0 in all units of formula (IV), 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 from 0.05 to 3, in particular from 0.2 to 1, by weight of the sum of the alkali silicates (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

Production 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 three-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 organopolystloxane of the formula

With an average molecular weight of about 600 g / mol and a viscosity of about 20 mPa.s with 150 g of N- (2-aminoethyl) -3-aminopropyltrimethoxysilane, and the mixture thus obtained was heated under reflux for 6 hours. 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 above-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 and for 5 hours. is heated to 90 ° C to form 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

I, 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, made of lime stone bonded with lime mortar, is equipped 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.

The drill holes were injected at first 5 L and after 2 hours a further 5 L per running meter of masonry impregnated composition 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)

The masonry described in Example 1 is first injected with 5 L per meter of masonry of the alkaline solution described. After 2 hours, an additional 5 L is injected per meter of masonry of the impregnating agent produced as indicated 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: 6.89% by weight above the injection plane: 12.91% by weight.

Example 3 (according to the invention)

The masonry described in Example 1 is first injected with 5 liters per running meter of masonry of the impregnating composition made as indicated diluted with water at a ratio of 1: 5. After 2 hours an additional 5 liters per running meter of masonry solution of the described alkaline solution 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 described diluted 1: 10 with water per standard meter of masonry. After 2 hours, an additional 5 L of the 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. The content is below the level of injection: 10.29% by weight above the level of injection: 1.14% by weight.

Claims (3)

PATENT CLAIMS Water-repellent impregnation method for masonry, characterized in that the masonry is treated in a first step with a highly dispersed, water-emulsified, impregnating composition comprising (Al) organoalkoxysilanes having 1 or 2 identical or different monovalent hydrocarbon residues C to C | _{5 are} bonded by a SiC- bond, optionally substituted by halogen, and the other residues are the same or different alkoxy residues C; C and _F, or (A2) organosiloxane containing alkoxy groups and composed of units of formula (I) R.SíOR'j / OH) ^^ (ΟΙ where means: R is the same or different monovalent hydrocarbon radicals C 1 to C ₁₅ , optionally substituted by halogen, bound by a SiC- bond, R ^{1 the} same or different monovalent alkyl radicals C 1 to C 8, x 0, 1, 2 or 3, on average 0.9 to 1.8, y 0, 1, 2 or 3, average 0.01 to 2.0 to 0, 1, 2 or 3, with an average of 0.0 to 0.5, provided that the sum of x, y and z is at most 3.5, or (A3) a mixture of said organoalkoxysilane and organosiloxane containing alkoxy groups and (B) a water-soluble organic or an inorganic acid and an organopolysiloxane which, in addition to the other organosiloxane units, contains those siloxane units having monovalent, by means of a SiC-bond, of at least 0.5% by weight of basic nitrogen, based on the weight of organopolysiloxane obtainable from acids and polysiloxanes built from units of formula (II) R / R _p \ OR ⁴⁾ _c SiO _{fourth a} . _b . _{c (II)>} where: R ² identical or different monohydric hydrocarbon radicals C _t to C _15, containing basic nitrogen bonded SiC bond or hydrogen, R ³ identical or different radicals mono- basic nitrogen-bonded SiC bond, R ^{4 is} hydrogen or the same or different alkyl radicals C 1 to 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 c 0, 1, 2 or 3, on average 0.1 to 0.8, in particular 0.2 to 0.6, the weight ratio of components A1, A2 and B to water being 1: 4 to 1:30 and in the second step the masonry is treated without drying with a solution: (C1) an alkali metal silicate or (C2) an alkali metal siliconate, or (C3) a mixture of an alkali metal silicate and siliconate in water, wherein the alkali metal silicates (C1) and alkali metal siliconates (C2) used are constructed from units of formula (IV) ) M _d Re ⁷ SiO _{4 = E = £} (M where Sodium or potassium atoms, R ⁷ identical or different monovalent hydrocarbon radicals to C | ₅ , bound 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 With the proviso that the sum of the given average values of dae is at most 3.0 and the concentration of components C1 and C2 in the aqueous solution is 0.5 to 20% by weight. Method according to claim 1, characterized in that in the second step, an organoalkoxysilane, an organosiloxane containing alkoxy groups (A2) and salts (B) of 0.05 to 3 parts by weight of the sum of the components used in the first step (A1) are used. the sums of alkali metal silicates (C1) and alkali metal siliconates (C2), always counted as anhydrous substances. Method according to claim 1 or 2, characterized in that the rising moisture in the masonry is removed by injection of said components (A1) or (A2), or (A3) and (B) and (Cl), or (C2), or (C3) into masonry.