KR102324937B1 - Binder composition for improved mortars and coatings - Google Patents

Abstract

Binder composition for reinforcing mortars and coatings comprising a first conventional mineral component and a second component based on powdered slaked lime, wherein the second component based on powdered lime is calculated according to the BET method, 12 m ² Compositions with a specific surface area of less than /g, advantageously less than 11 m ² /g, in particular less than 10 m ² /g, preferably less than 9 m ² /g, and reinforcing compositions comprising the aforementioned compositions with aggregates of the mineral type Use as a coating or mortar system.

Description

BINDER COMPOSITION FOR IMPROVED MORTARS AND COATINGS

The present invention relates to a binder composition for reinforcing coatings with mortars comprising a first conventional mineral component and a second component based on powdered slaked lime.

The term "mortar" in the meaning of the present invention refers to a mixture of aggregates, mainly sand, with one or several mineral binders such as lime, cement, etc.; Then it means traditional mortar. Such mortars are used in construction for bonding and/or covering building materials and may also contain fillers, one or several organic binders, additives and/or auxiliaries. A high value added or highly added mortar, in which the composition and manufacturing process are prescribed to obtain specific properties, may be described as a hardened, practiced or further formulated (designed) mortar. In particular, adhesive mortars, self-leveling floors, screeds, repair mortars, certain masonry mortars and the like are included.

The term "coating" means a mortar composition intended to be applied as a layer in one or several passes. The coating is therefore a mortar for outdoor surface applications (painting) or for indoor surface applications (plastering).

Mortars and coatings can be made from a combination of hydraulic, pozzolanic or hydraulic and binder agents, or mixtures thereof. The use of weathered lime or slaked lime has the following advantages compared to binders without lime: better plasticity as a result of better handling/applicability, better water retention allowing improved resistance towards changes in the porosity of the support , better permeability to water vapor and better flexibility of the curing system.

Furthermore, the addition of additives, in particular organic additives, in reinforcing (also so-called practice or compounding) mortars and coatings is a preferred method for the purpose of optimizing the application performance.

Slaked lime consists of a set of solid particles, mainly _{calcium 2-hydroxide of the formula Ca(OH) 2} , and is the industrial result of rapidly slaking lime using water in a reaction called hydration. This product is also known as hydrated lime or weathered lime and typically has a BET surface area of the order of ^{15 to 20 m 2} /g (JAH Oates, Lime and Limestone-Chemistry and Technology, Production and Uses , 1998, p.220). .

This slaked lime or hydrated lime or weathered lime or calcium hydroxide as well as impurities provided in tens of grams per kilogram, namely SiO ₂ , Al ₂ O ₃ , Fe ₂ O ₃ , MnO, P ₂ O ₅ , K ₂ O and/or It may contain phases derived from SO _{3 .} Nevertheless, the sum of these impurities, denoted as oxides mentioned above, does not exceed 5% by mass, preferably 3% by mass, preferably 2% by mass or even 1% by mass of the mass of the slaked lime according to the invention. In particular, the slaked lime advantageously contains less than 1.5% by mass, preferably less than 1% and preferably less than 0.3% Fe ₂ O ₃ .

Such slaked lime may contain magnesium oxide and/or hydroxide. Depending on the content of these compounds, the lime will be referred to as partially or fully digested magnesium, dolomite lime or dolomite lime.

Such slaked lime may also contain calcium oxide that will not hydrate during digestion or stemming from non-homogeneous baking (localized over-baking), just as it may contain _{calcium carbonate CaCO 3} or magnesium carbonate MgCO _{3 .} . These carbonates can be minced from the initial limestone (or from crude dolomite) from which the slaked lime according to the invention is derived (unbaked), or from the partial carbonation of the slaked lime in contact with air. The calcium oxide content in the slaked lime within the scope of the present invention is generally less than 5% by mass, preferably less than 2% and advantageously less than 1%. The carbonate content is less than 10% by mass, preferably less than 6%, advantageously less than 4%, more advantageously less than 3%.

In the art of lime mortars and coatings, for the purpose of improving the properties described above, the existing teachings suggest to work for example on specific surface areas and in fact disclose many results which differ significantly from one another.

For example, document WO 2008034616 discloses that it is possible to accelerate the development of the compressive force of a binder composition having hydraulic properties by adding lime having a specific specific surface area.

The specific surface area targeted in this document consists of 7 to 16 m ^{2 /g and preferred embodiments are 11 to 14 m 2} /g for a lime content of about 5% by weight, based on the total weight of the binder (Portland cement). It is directed towards slaked lime with a specific surface area composed of

Document BE 1006309 teaches in particular the use of a method for increasing the specific surface area and plasticity properties of hydrated lime by means of chemical modifiers in order to give it a much higher specific surface area. This object of the present invention is furthermore a hydrated lime having a much greater water holding capacity and the ability to become more plastic. In this way, the slaked lime so produced can be used in the mortar in smaller proportions while allowing the mortar to retain the workability required by codes or standards.

According to document DE 102005018100, calcium hydroxide with a large fineness is used to prepare hydraulic mortars or binders to produce concrete with improved flow and hardening properties. Such calcium hydroxide with large fineness typically has high BET and Blaine specific surface areas.

Furthermore, document WO 9209528 provides the use of calcium hydroxide or slaked lime as milk or slurry of _{Ca(OH) 2} and/or Ca(OH) ₂ -Mg(OH) _{2 in} the building industry for the production of mortars, coatings, etc. do. This document describes the quality and properties of Ca(OH) ₂ milk and/or slurries optionally admixed with Mg(OH) ₂ , for example reactive suspended Ca(OH) ₂ and/or Ca(OH) ₂ - The teaching is dependent on the size and structure of the aggregates or micelles of Mg(OH) _{2 .} The conclusion of this document is actually _{to obtain a milk or slurry in which the particles of Ca(OH) 2} and/or Ca(OH) ₂ -Mg(OH) ₂ in aggregates or micelles are highly reactive and to reduce or avoid sedimentation of the particles. It should have a small grain size and large porosity. According to this document, in the case of a slurry having a small grain size and a large porosity, it is possible to obtain a mortar having high plasticity and high water holding capacity.

Thus, slaked lime with a high specific surface area should be selected for the purpose of having the high plasticity required for coatings and reinforcing mortars, as well as the water retention required for application to any type of surface.

Notwithstanding the advantages mentioned above, the use of binders based on slaked lime also contributes to the need to use, for example, the need to use high content of organic additives, which are typically present in reinforcing mortars and coatings, and a role therefor for water retention, flow properties ( Management of handling capacity/plasticity, castability, flow thresholds...), guaranteeing special functions such as adhesion, abrasion resistance, hydrophobicization or additionally entrainment of air leads to some disadvantages. .

The present invention aims to preserve the above-mentioned advantages of binder compositions based on slaked lime, while suppressing some of the drawbacks outlined above or further improving the properties of the mortars initially produced from these formulations.

To solve this problem, according to the invention, the binder composition shown in the introduction is provided, wherein said second component based on powdered slaked lime is ^{less than 12 m 2} /g, in particular less than 11 m ² /g, advantageously less than 10 It has a specific surface area calculated according to the BET method of less ^{than m 2} /g, preferably less than 9 m ^{2 /g.}

The specific surface area of the slaked lime according to the invention is measured by a nitrogen adsorption manometer after degassing in vacuum at 190° C. for at least 2 hours and calculated according to the BET method.

It is important not to confuse the BET surface area measured by nitrogen adsorption or desorption after degassing with the Blaine specific surface area measured by air permeability. Indeed, the BET method offers the possibility to measure the total specific surface area of a compound, especially by taking into account its porosity, and is not directly dependent on the size of the constituent particles, while the Blaine method exclusively determines the external surface area of the particles of this compound. It provides the possibility to measure with the latter and is directly dependent on the size of the latter (Allan T., Particle Size Measurement, Vol. 2, Surface area and pore size determination, fifth edition, 1997, page 11, page 39).

Binder compositions according to the present invention, when used in "hardened" or "performing" mortars or "high value" or highly added coatings, exhibit water retention, handling capacity/flow properties, air entrainment, adhesion, abrasion resistance and It offers the possibility to benefit from the positive effects of slaked lime while maintaining the functionality of organic additives such as hydrophobicity. Indeed, because of the specific specific surface area of the slaked lime of the present invention, the adsorption of these organic additives in the pores of the slaked lime particles is strongly reduced. Furthermore, the impact on the cost of the bonding composition or the cost of mortars and coatings made from the latter is of particular interest.

In fact, in reinforcing coatings and reinforcing mortars with a high content of organic additives, such as adhesive mortars with high added value, self-leveling flooring, repair mortars and certain masonry mortars, the present invention contains slaked lime having a low specific surface area The binder composition according to the present invention reduces the possibility of reducing the interaction of slaked lime with organic additives, and thus the risk of inhibiting their functionality in the mortar and therefore "reinforced" or "executed" or "blended" mortars and coatings. offers the possibility of avoiding a significant increase in the content of these additives in the composition of

Moreover, the binder composition according to the invention also offers the possibility that the reinforcing coatings and mortars obtained from the latter retain the advantageous properties of plasticity and water retention. This effect is particularly unexpected, since to date such properties only appear to be achievable by slaked lime having a high specific surface area.

Advantageously, the second component based on powdered slaked lime is ^{less than 8.5 m 2} /g, preferably less than 8 m ² /g, preferentially less than 7.5 m ² /g, in particular less than 7 m ² /g, BET method has a specific surface area calculated according to

In certain embodiments, the first conventional mineral component is from the group consisting of cement, standard slaked or hydrated lime, weathered lime, natural or artificial hydraulic lime, masonry, binders for pozzolanic and hydraulic binders, gypsum and mixtures thereof. is chosen

In a specific embodiment, said cement is selected from the group of conventional cement (gray or white), refractory cement, fused alumina cement, from cement, portland cement, blast furnace slag, fly ash and mixtures thereof.

Preferably, the second component comprises at least 12% by weight, preferably at least 15% by weight, in particular at least 20% by weight, in particular at least 30% by weight, advantageously at least 40% by weight and at least 80% by weight, based on the total weight of the binder composition % or less, in particular up to 70% by weight, advantageously up to 60% by weight.

A lower content of the second component in the binder composition will not offer the possibility to benefit from the advantages of slaked lime as mentioned above or to demonstrate the drawbacks associated with the use of the latter which the present invention is precisely to address.

In a more specific manner, the second component has a d _{3 greater than 0.1 μm, in particular greater than 0.5 μm and a d 98} of 250 μm or less, preferably 200 μm or less.

The designation of d _x denotes the diameter in μm at which X% of the measured particles or granules are smaller than that.

In a particularly advantageous embodiment according to the invention, the second component has particles with _{a d 93 of 90 μm or less.}

In a preferred embodiment according to the invention, said second component based on powdered slaked lime has a total pore volume of at least ^{0.02 cm 3} /g, preferably at least 0.025 cm ^{3 /g, calculated according to the nitrogen adsorption BJH method} .

Advantageously, said second component based on powdered slaked lime has a total pore volume of ^{0.07 cm 3} /g or less, preferably 0.06 cm ^{3 /g or less, calculated according to the nitrogen adsorption BJH method.}

"Total pore volume" in the sense of the present invention means, after degassing in vacuo at 190°C for at least 2 hours, its size measured by a nitrogen adsorption manometer and calculated according to the BJH method, having a size for it of 17 to 1,000 Å (1.7 to 100 nm) means the total volume of pores.

Advantageously, said second component based on slaked lime ^{is greater than 350 kg/m 3} , preferably greater than 400 kg/m ³ and less than 600 kg/m ³ , in particular 550 as measured according to EN 459-2 standard. It has a bulk density of less than kg/m ^{3 .}

Preferentially, the composition according to the invention further comprises an air entrainer such as a surfactant or tenside, in particular selected from the group of alkyl sulfates or sulfonates, ethoxylated fatty alcohols, block copolymers and mixtures thereof. includes

In an alternative according to the invention, the binder composition may further comprise one or several water retention agents, for example cellulose ethers or guar gum, derivatives thereof and mixtures thereof.

In a further alternative according to the invention, the binder composition further comprises, in particular from the group of hydrocolloids, more particularly polysaccharides, starch derivatives, alginates, guar gum and derivatives thereof, xanthan gum and derivatives thereof, carrageenan rheology modifiers selected from the group of gums and their derivatives, superplasticizers such as succinoglycans, polycarboxylates or melamine-formaldehyde, mineral colloids, in particular silica and clays, and mixtures thereof.

Advantageously, the composition according to the invention further comprises hydrophobizing agents selected from the group of fatty acids such as stearate and oleates, vegetable and mineral oils, silanes, siloxanes and mixtures thereof.

Particularly advantageously, the composition according to the invention further comprises a third organic component selected from the group of industrial latexes, such as, for example, polyvinyl acetate/ethylene copolymers, polyvinyl acetate/versatate copolymers, styrene/butadiene copolymers and the like. include

Other embodiments of the binder composition for reinforcing coatings and mortars according to the invention are indicated in the appended claims.

An object of the invention is also, as mentioned above, a system of a reinforcing coating or mortar comprising agglomerates of the mineral type and a composition according to the invention.

The binder composition for mortars and coatings comprises a first conventional mineral component and a second component based on powdered slaked lime. Said second component on the basis of powdered slaked lime is ^{less than 12 m 2} /g, in particular less than 11 m ² /g, advantageously less than 10 m ² /g, preferably less than 9 m ² /g, calculated according to the BET method. has a specific surface area of

Advantageously, said second component has a specific surface area of less ^{than 8.5 m 2} /g, preferably less than 8 m ² /g, preferentially less than 7.5 m ² /g, in particular less than 7 m ² /g, calculated according to the BET method. have

In certain embodiments, said first conventional mineral component is from the group consisting of cement, standard slaked lime or hydrated lime or weathered lime, natural or artificial hydraulic lime, masonry, binders for pozzolanic and hydraulic binders, gypsum and mixtures thereof. is chosen

Advantageously, the cement is usually selected from the group of cement (gray or white), refractory cement, fused alumina cement, from cement, portland cement, blast furnace slag, fly ash and mixtures thereof.

Preferably, the second component comprises at least 12% by weight, preferably at least 15% by weight, in particular at least 20% by weight, in particular at least 30% by weight, advantageously at least 40% by weight and at least 80% by weight, based on the total weight of the binder composition. It is present in an amount up to, in particular up to 70% by weight, in particular up to 60% by weight.

_{More specifically, the second component has a d 3} greater than 0.1 μm, in particular greater than 0.5 μm _{and a d 98} of 250 μm or less, preferably 200 μm or less.

In a particularly advantageous embodiment according to the invention, the second component has particles with _{a d 93 of less than or equal to 90 μm.}

In a preferred embodiment according to the invention, said second component based on powdered slaked lime has a total pore volume of at least ^{0.02 cm 3} /g, preferably at least 0.025 cm ^{3 /g, calculated according to the nitrogen adsorption BJH method} .

Preferably, said second component based on powdered slaked lime has a total pore volume of ^{0.07 cm 3} /g or less, preferably 0.06 cm ^{3 /g or less, calculated according to the nitrogen adsorption BJH method.}

In a preferred embodiment according to the invention, a system as mentioned above is in dry form, which is easy to mix with water.

In an alternative according to the invention, the system further comprises water and is therefore in a form convenient for use.

Advantageously, said system according to the invention further comprises an air entrainer such as a surfactant or tenside, in particular selected from the group of alkyl sulfates or sulfonates, ethoxylated fatty alcohols, block copolymers and mixtures thereof, , it may be added to the agglomerate, to the binder composition or to the system after or during mixing of the agglomerate with the binder composition.

In a particular embodiment of the present invention, the system further comprises one or several water retention agents, for example cellulose ether or guar gum, derivatives thereof and mixtures thereof, which after or after mixing of said binder composition and aggregates may be added to the aggregate, to the binder composition, or to the system.

In another preferred embodiment of the invention, the system further comprises, in particular from the group of hydrocolloids, more particularly polysaccharides, starch derivatives, alginates, guar gum and its derivatives, xanthan gum and its derivatives, carrageenan gum and its derivatives. a rheology modifier selected from the group of derivatives of, succinoglycan, polycarboxylate or superplasticizer such as melamine-formaldehyde, mineral colloids, in particular silica and clay, and mixtures thereof, said binder composition It may be added to the agglomerates, to the binder composition or to the system after or during mixing of the agglomerates with the agglomerates.

In yet another preferred embodiment of the invention, the system further comprises a hydrophobizing agent selected from the group of fatty acid salts such as stearate and oleate, vegetable and mineral oils, silanes, siloxanes and mixtures thereof, said binder It may be added to the agglomerate, to the binder composition or to the system after or during mixing of the composition with the agglomerate.

Other embodiments of the system of reinforcing coatings or mortars comprising aggregates of the mineral type according to the invention are indicated in the appended claims.

The invention also relates to the use of the binder composition according to the invention in reinforcing coatings.

The invention also relates to the use of the binder composition according to the invention in reinforcing mortars.

Advantageously, the use relies on agglomerates having a particle size such that _{d 5} is greater than or equal to 63 μm and d _{98 is less than or equal to 4 mm.}

Other embodiments of the use of the composition are mentioned in the appended claims.

Other features, details and advantages of the invention will emerge from the description given below, which is non-limiting and with reference to examples.

Example

Example 1: Effect of hydrated lime with low specific surface area on coating

A binder composition for coating having a high added value mentioned in Table 1 was prepared using the following ingredients in the indicated proportions:

product ratio (wt%) Cement CEM I 42.5R 51% hydrated lime 47% Redispersible Latex Powder (Vinnapas 8031 H) 0.4% Water retention agent (Tylose MH 15000 YP4) 0.5% Air Entrainer (Hostapur OSB) 0.1% Hydrophobizing agent (Zinkum 5) One%

In this formulation, lime with high specific surface area (HS) is compared with two limes with low specific surface area (BS), and standard lime with standard specific surface area (STD) according to Table 2.

As used herein, the expression "specific surface area" means the specific surface area measured by a nitrogen adsorption manometer and calculated according to the Brunauer, Emmett and Teller model (BET method) after degassing in vacuum at 190° C. for at least 2 hours. .

product BET surface area (m ² /g) BJH pore volume (cm ³ /g) Lime HS 45.1 0.24 Lime STD-1 15.9 0.08 Lime BS1 8.4 0.04 Lime BS2 7.2 0.04

The coating is prepared starting from the above-mentioned binder by adding siliceous sand to obtain the bulk composition mentioned in Table 3.

product ratio (wt%) Cement CEM I 42.5 R 13% hydrated lime 12% Redispersible Latex Powder (Vinnapas 8031H) 0.1% Water retention agent (Tylose MH 15000 YP4) 0.12% Air Entrainer (Hostapur OSB) 0.02% Hydrophobizing agent (Zinkum 5) 0.3% siliceous sand (0.1-0.6 mm) 74.5%

The mixing ratio (water/solid, W/S) of the new coating according to Table 3 is adjusted to achieve a slurry consistency (slump) of 175±5 mm according to EN1015-3 standard. The characteristics of the coating are mentioned in Table 4. The density of new coatings and entrained air is evaluated according to EN1015-6 and EN1015-7 standards. Water retention is assessed using the same slurry consistency (slump of 175±5 mm) for 15 minutes using an apparatus according to ASTM C91 standard with a negative pressure of 7,000 Pa. Only the water retention value after 15 minutes is displayed.

coating based on W/S [%] slump [mm] density air [%] Water retention 15 minutes [%] Lime HS 28.4 178 1.7 14 92 Lime STD-1 21.5 177 1.6 18 94 Lime BS1 21.3 170 1.5 22 95 Lime BS2 20.4 175 1.5 24 96

As can be seen from the table, a lime-based coating with a low specific surface area (BS) has a lower water demand (W/S). It is well known that low water demand reduces the risk of shrinkage and cracking of the coating, and increases the mechanical strength of formulations comprising hydraulic binders.

Lime with a low specific surface area also offers organic additives the possibility to better fulfill the role as an air entrainer or water retainer. Higher air levels provide the new coating with better plasticity/handling capacity and increase its yield, as well as the isolating power and resistance of the cured coating to freeze/thaw cycles. The better water retention and high porosity of the new coating increases its resistance to deformable supports.

It should be noted that increases in water retention above 92% while maintaining good handling capacity are typically difficult to obtain. Such strong water retention is further intensively pursued by those skilled in the art.

Example 2. Effect of Hydrated Lime with Low Specific Surface Area in Reinforcing Masonry Mortar (II)

A binder composition for masonry mortar mentioned in Table 5 was prepared using the following ingredients in the indicated proportions.

product ratio (wt%) Cement CEM I 42.5 N 84.4% slaked lime 15.4% Air Entrainer (Hostapur OSB) 0.1% Water retention agent (Tylose MH 15003 P6) 0.1%

In this formulation, lime with low specific surface area (BS) is compared with standard lime with standard specific surface area (STD) according to Table 6.

product BET surface (m ² /g) BJH pore volume (cm ³ /g) Lime STD-3 15.2 0.08 Lime BS2 7.2 0.04

Reinforcing masonry mortars are prepared starting from the above-mentioned binders by adding siliceous sand to obtain the bulk compositions mentioned in Table 7.

product ratio (wt%) Cement CEM I 42.5 N 11% slaked lime 2% limestone filler 11% Air Entrainer (Hostapur OSB) 0.01% Water retention agent (Tylose MH 15003 P6) 0.01% siliceous sand (0.1-1.2 mm) 76%

The mixing level (water/solids, W/S) of the fresh mortar according to Table 5 is adjusted to achieve a slurry consistency (slump) of 175±5 mm according to EN1015-3 standard. The properties of the mortar are mentioned in Table 8.

The density of fresh mortar and entrained air is evaluated according to EN1015-6 and EN1015-7 standards.

Water retention is assessed using the same slurry consistency (slump of 175±5 mm) for 15 minutes using an apparatus according to ASTM C91 standard with a negative pressure of 7,000 Pa. Only the water retention value after 15 minutes is displayed.

based on below
mortar W/S [%] slump [mm] density air [%] 15 minutes water retention
[%] Lime STD-3 14.1 173 1.8 18.0 72 Lime BS2 13.7 176 1.6 25.0 75

Again, limes with low specific surface area (BS) better improve their dynamics with the possibility that air entrainer and water retention additives will optionally reduce the level in the composition or increase water retention for the same amount of additive. allow to be satisfied According to this example, the effect on air entrainment is particularly pronounced and interesting, and the effect on water retention is finally limited due to the low content of the water retention additive.

Of course, the present invention is by no means limited to the above-described embodiments and many modifications may be made to the above-described embodiments without departing from the scope of the appended claims.

Claims (26)

A binder composition for reinforcing mortars and coatings comprising a first conventional mineral component and a second component based on powdered slaked lime,
Said second component based on powdered slaked lime has a specific surface area of less ^{than 12 m 2} /g, less than 11 m ² /g, less than 10 m ² /g, or less than 9 m ^{2 /g, calculated according to the BET method.} with,
and the second component is at least 12 wt%, at least 15 wt%, at least 20 wt%, at least 30 wt%, or at least 40 wt%, based on the total weight of the binder composition, at least 80 wt%, at most 70 wt% , or a binder composition for reinforcing mortars and coatings present in an amount of up to 60% by weight. The method of claim 1 , wherein the second component has a specific surface area of less ^{than 8.5 m 2} /g, less than 8 m ² /g, less than 7.5 m ² /g, or less than 7 m ^{2 /g, calculated according to the BET method.} Binder composition for reinforcing mortar and coating, characterized in that it has. The method of claim 1, wherein the first conventional mineral component is selected from the group consisting of cement, standard slaked lime or weathered lime, natural or artificial hydraulic lime, masonry binder, pozzolanic and hydraulic binder, gypsum and mixtures thereof. Binder composition for reinforcing mortar and coating, characterized in that. 4. The binder composition for reinforcing mortar and coating according to claim 3, wherein said cement is selected from the group of ordinary cement, refractory cement, fused alumina cement, from cement, portland cement, blast furnace slag, fly ash and mixtures thereof. . The binder according to claim 1, wherein the second component has particles having a _{d 3} greater than 0.1 μm, or greater than 0.5 μm, _{and a d 98} of 250 μm or less, or 200 μm or less. composition. The binder composition for reinforcing mortar and coating according to claim 1, wherein the second component has _{particles having a d 93 of 90 μm or less.} The second component according to claim 1, characterized in that the second component based on powdered slaked lime has a total pore volume of at least ^{0.02 cm 3} /g, or at least 0.025 cm ^{3 /g, calculated according to the BJH method of nitrogen adsorption.} Binder compositions for reinforcing mortars and coatings. 2. The method of claim 1, wherein the second component based on powdered slaked lime has a total pore volume of ^{0.07 cm 3} /g or less, or 0.06 cm ^{3 /g or less, calculated according to the BJH method of nitrogen adsorption.} A binder composition for reinforcing mortars and coatings. The binder composition for reinforcing mortar and coating according to claim 1, further comprising an air entrainer comprising a surfactant or tenside. 2. The binder composition of claim 1, further comprising a water retention agent comprising cellulose ether, guar gum, derivatives thereof or mixtures thereof. The binder composition of claim 1, further comprising a rheology modifier comprising a hydrocolloid. 2. The binder of claim 1, further comprising a hydrophobizing agent selected from the group of fatty acid salts comprising stearate and oleate, vegetable and mineral oils, silanes, siloxanes and mixtures thereof. composition. 2. The method of claim 1, further comprising a third organic component comprising an industrial latex based on polyvinyl acetate/ethylene copolymer, polyvinyl acetate/versatate copolymer, styrene/butadiene copolymer or combinations thereof. Reinforcing mortar and binder composition for coating, characterized in that. 14. The method according to any one of claims 1 to 13, wherein the second component based on slaked lime is greater ^{than 350 kg/m 3} , greater than 400 kg/m ³ , measured according to EN 459-2 standard, 600 A binder composition for reinforcing mortars and coatings, characterized in that it has a bulk density of less than kg/m ³ , or less than 550 kg/m ^{3 .} A reinforcing coating or mortar system comprising agglomerates of mineral type and a binder composition according to claim 1 . 16. Reinforcement coating or mortar system according to claim 15, characterized in that it is in a dry form which is miscible with water. 16. Reinforcement coating or mortar system according to claim 15, characterized in that it further comprises water and is thus in a form that can be easily used. 16. The reinforcing coating or mortar system of claim 15, further comprising an air entrainer comprising a surfactant or tenside. 16. The reinforcing coating or mortar system of claim 15, further comprising a water retention agent comprising cellulose ether, guar gum, derivatives thereof or mixtures thereof. 16. The reinforcing coating or mortar system of claim 15, further comprising a rheology modifier comprising a hydrocolloid. 16. The reinforcing coating or mortar system of claim 15, further comprising a hydrophobizing agent selected from the group of fatty acid salts comprising stearates and oleates, vegetable and mineral oils, silanes, siloxanes and mixtures thereof. 16. The method of claim 15, further comprising a third organic component comprising an industrial latex based on polyvinyl acetate/ethylene copolymer, polyvinyl acetate/versatate copolymer, styrene/butadiene copolymer, or combinations thereof. Reinforcing coating or mortar system, characterized in that. delete delete delete delete