Classifications

• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
  • C04B40/0028—Aspects relating to the mixing step of the mortar preparation
  • C04B40/0039—Premixtures of ingredients
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
  • C04B24/24—Macromolecular compounds
  • C04B24/38—Polysaccharides or derivatives thereof
  • C04B24/383—Cellulose or derivatives thereof
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L3/00—Compositions of starch, amylose or amylopectin or of their derivatives or degradation products
  • C08L3/04—Starch derivatives, e.g. crosslinked derivatives
  • C08L3/08—Ethers
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
  • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
  • C04B2111/00482—Coating or impregnation materials
  • C04B2111/00517—Coating or impregnation materials for masonry
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
  • C04B2111/20—Resistance against chemical, physical or biological attack
  • C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
  • C04B2111/52—Sound-insulating materials

Definitions

• the technical field of the invention is that of mineral foams plaster, mortars and concrete for the building and adjuvants to obtain them.
• the present invention relates to an adjuvantation formulation for the preparation of these foams, said formulation being intended to allow the formation of foams by trapping air, during the preparation of wet forms of coatings, mortars and concretes, ready for application in building or civil engineering.
• These foams are prepared by projection or spreading on a building surface and the coatings thus obtained constitute other objects of the present invention.
• These coatings may be wall coverings (preferably exterior) or floor coverings.
• These foams can also be used in the construction of building or civil engineering works, for example prefabricated elements such as pre-walls in which the foams are used as filling material.
• any singular denotes indifferently a singular or a plural.
• adjuvants for mortar or concrete coating compositions are already known, whose function is to generate gases in situ and thus to form a foam after mixing and porosity after curing. This is particularly the case of aluminum powders capable of producing hydrogen in an alkaline medium, as well as peroxides such as hydrogen peroxide which gives off oxygen when in contact with water.
• Adjuvants for air-entraining concrete mortars are also known, which are intended to trap the surrounding air, when mixing with the water (mixing) dry compositions of coatings, mortars or concrete.
• These air entrainers are for example surfactants, fatty acids, alkaline salts of fatty acids such as sodium lauryl sulphate. Such known air-entraining admixtures are perfectible.
• This stabilization is all the more delicate that it must not be obtained to the detriment of the properties of use (eg of the handling) of the wet forms of plaster, mortar and concrete foams, or to the detriment of the properties (particularly mechanical) expected for the hardened forms of these foams.
• the stability of the foam must also be present at each stage of the preparation and application processes. This should result in an identical density tank d c kneading and after passing through the pipes (density output lance s i) and at the projection, when the application operates as well.
• (v) Provide a plaster, mortar, or concrete mineral foam in accordance with at least one of paragraphs (i) to (iv), and which, after being applied to a substrate or shaped, and cured, having, on the one hand, a reduced thermal conductivity ⁇ (Wm '.K 1 ) less than or equal to 0.1, preferably to 0.085 and preferably to 0.065, which makes it thermally insulating, and secondly , excellent sound insulation properties.
• ⁇ Wm '.K 1
• (x) Provide a plaster, mortar, or concrete mineral foam according to at least one of subparagraphs (i) to (ix), having a thermal conductivity ⁇ less than or equal to 0.1, preferably to 0.085 and preferably at 0.065 ' and / or a shock attenuation (acoustic insulation) ⁇ 1 greater than or equal to 3 dB or even 4 dB, and / or a water retention of greater than 80% and / or a setting time between 5 and 20 hours.
• (xi) Provide a process for the preparation of a plaster, mortar, or concrete mineral foam in accordance with at least one of (i) to (x), which process must be economical and simple to enforce.
• (xii) Provide processes for applying a plaster, mortar, or concrete mineral foam in accordance with at least one of paragraphs (i) to (x).
• (xiii) Provide from a plaster, mortar, or concrete mineral foam in accordance with at least one of paragraphs (i) to (x), a plaster, mortar or hardened, porous, lightweight concrete thermally and / or acoustically, fire and heat resistant, simple to apply, economical and with good mechanical properties.
• (xiv) Provide a mortar mortar foam in accordance with at least one of (i) to (x), lighter pumpable that may be used for the manufacture of prefabricated building or civil engineering works, for example in filling between two walls in pre-wall type applications.
• the invention which relates to a foaming adjuvant, in particular for a coating, mortar or concrete, characterized in that it comprises:
• the foam thus produced is sparse and stable.
• the coating or the structure that can be obtained from this foam has a porous structure, lightened, acoustically and thermally insulating (low coefficient ⁇ of thermal conductivity), fire-resistant, and without affecting the conventional functions required. for such products, namely in particular: protection / waterproofing of the support, possibly decoration, preparation, maneuverability, durability, and mechanical strength (good hardness good resistance to cracking).
• the products according to the invention have good performance of implementation such as "workability” and rheological properties adapted to pumping.
• “Workability” is the ability of a mortar to have an open time, that is, a time after mixing during which the product is manageable. An open time that is too short corresponds to a rapid setting of the binder and an open time that is too long can favor the appearance of certain degradations of the coating.
• the present invention also aims at:
• a dry composition for the preparation of a mineral foam plaster, mortar or concrete characterized in that it comprises:
• vs. optionally at least one granulate
• air entrainer preferably which is chosen from surfactants, more preferably from the group comprising alkyl sulphates, alkyl sulphonates, alkylarylsulphates and their mixtures, and even more preferably which comprises sodium lauryl sulphate.
• a plaster mineral foam e.g., facade plaster or acoustic plaster
• mortar e.g. fireproof mortar
• sprayable wet concrete comprising the aforementioned dry composition
• a building or civil engineering structure obtained from a plaster, mortar or concrete mineral foam as referred to above.
• Coating refers more specifically to a mortar used in the surface coating of a surface in order to protect it, to homogenize it, etc.
• mortar refers more particularly to a mixture of binder (hydraulic or organic), filler, sands (aggregates with a diameter ⁇ 5mm), water and possibly adjuvants and special additions.
• Conscrete refers more specifically to a mixture of binder (hydraulic or organic), aggregates, water and possibly adjuvants and special additions.
• All the viscosities referred to herein correspond to a dynamic viscosity value at 25 ° C. called “Newtonian", that is to say the dynamic viscosity which is measured, in a manner known per se, at a gradient shear rate sufficiently low that the measured viscosity is independent of the velocity gradient.
• This viscosity can be measured for example using a BROOKFIELD viscometer, according to the AFNOR NFT 76 102 standard of February 1972, specifically with a spindle 4 / in suspension at 6.8% / 20 ° C. with a particle ratio greater than 300 ⁇ ⁇ 50mg / g.
• thermal conductivity ⁇ in W m ⁇ K 1 measured after drying according to the method described hereinafter in the examples.
• density d d density (Kg / L) measured on cured product according to the method described hereinafter in the examples.
• density d c density (Kg / L) measured on the dough in the mixing tank according to the method described hereinafter in the examples.
• density s i density (Kg / L) measured on the slurry at the outlet of lance according to the method described hereinafter in the Examples.
• low density "low density” to qualify the coating, mortar or hardened concrete, means that its density d d , d c or d s "is less than or equal to 2.
• density means d less than or equal to 1.5.
• Spreading E measures the spread diameter on a glass plate of the floor coating with a CSTB ring (diameter 30 mm, height 50 mm). The realization of spreads are made at three deadlines: 5 minutes, 20 minutes and 30 minutes after the start of the spoil. The test is carried out according to standard NF EN 12706.
• particle size is Dmax in dry sieving.
• the particle size of a "powder” is less than or equal to 1 mm, preferably between 100 ⁇ and 1 mm. • The granulometry of a "granulate” is greater than 1 mm, preferably less than or equal to 10 mm.
• Filler denotes a light powdery mortar filler, comprising, for example, siliceous, calcareous, silico-calcareous particles and / or particles of perlite or vermiculite, of particle size less than or equal to 200 ⁇ .
• the quantitative composition (% by weight and in increasing order of preference) of the foaming adjunct ABC may be as follows:
• the foaming builder formulation ABC comprises at least one modified starch Al corresponding to the definition given above and at least one other modified starch A.2, different from A. 1, and also meeting the definition given above, the viscosity of A.1 being lower than that of A.2 and the DS of A.1 being higher than that of A.2.
• the modified starch A.I preferably has a very low viscosity. It is rather a hydroxypropylated starch ether with a high degree of substitution with a very good resistance to a high pH> 12. The thickening power of this starch passes through a maximum when its concentration increases.
• the modified starch A.2 partially replaces the modified starch A.I to improve the workability of the final product (reduction of stickiness to the tool) without degrading the density level obtained.
• the modified starch A.2 preferably has a low viscosity. It is rather a hydroxypropylated starch ether with a high degree of substitution and good resistance to a high pH> 12.
• the thickening power of this starch increases with its concentration.
• Stabilizer B is preferably a linear nonionic polymer of the polyacrylamide family. It may also be an ionic form, especially anionic. This linear polyacrylamide B may be mixed with urea. In practice, it is preferred to use it without urea.
• Stabilizer B ensures the stability of the air in the wet foam (plaster, mortar, concrete).
• the film-forming polymer C is advantageously a polyvinyl alcohol which contributes to the entrainment of air. In the case of an application as a floor covering, in particular, it avoids linting of the wet foam at the time of dressing to ruler immediately after the projection of the foam. It therefore contributes to the maneuverability of the wet product.
• the foaming adjuvant comprises a product marketed by the company under the name PAREXLANKO LANKOSTAB ®.
• the foaming adjuvant (b) is for example LANKOSTAB ® .
• This foaming adjuvant ABC is a trainer and air stabilizer, which ensures the greater stability of air trapping in the wet foam (coating, mortar, concrete) and therefore the density, particularly between the tank of kneading and projection lance release.
• the foaming adjuvant according to the invention makes it possible to prepare, on the one hand, mineral foams of plasters, mortars or lightened concretes, in wet / pasty form before application and, on the other hand, porous structures hardened after application.
• the invention thus relates to a dry composition dry composition for the preparation of a mineral foam plaster, mortar or concrete characterized in that it comprises: a. at least one mineral hydraulic binder (cement) and optionally at least one organic binder,
• vs. optionally at least one granulate
• air entrainer which is preferably chosen from surfactants, more preferably from the group comprising alkyl sulphates, alkyl sulphonates, alkylarylsulphates and their mixtures, and even more preferably which comprises sodium lauryl sulphate.
• the water retainer (e ') is advantageously a mixture of compounds as defined above, said mixture comprising at least one cellulose ether modified with a hydroxypropyl radical in a high degree of substitution (eg between 0.2 and 1), and of medium viscosity of the order of 30,000 +/- 10,000 mPa.s.
• This water retainer (e ') is chosen such that it allows, after mixing, a resumption of smoothing without tearing and thus contributes to the adjustment of the handling of the wet product.
• the air entrainer (e ) is a surfactant that contributes to the lightening of the product and promotes the creation in the product of a network of air bubbles that is stable over time.
• the quantitative composition (% by weight) of the water retenter (e ') and the air entrainer (e ") can be as follows:
• the invention also relates to a process for preparing a mineral foam coating, mortar or concrete from this dry composition.
• This process consists essentially of mixing water (mixing) with said dry composition, to produce a mineral foam plaster, mortar or wet concrete in which the air is trapped durably including using the adjuvant foaming.
• Another object of the invention consists in the supports, taken as such, coated with the aid of the plaster, mortar or concrete foam according to the invention and in the building / civil engineering works, taken as such, obtained using the plaster, mortar or concrete foam according to the invention.
• These structures may be prefabricated elements such as panels or premurs, in which the filler material is constituted at least in part by the plaster, mortar or concrete foam according to the invention.
• Foam technology according to the invention enables the development of coated projectable density d d c or d i s less than 1 and preferably less than 0.5, resulting in cured coatings having lower thermal conductivities or equal to 0.1 and preferably less than or equal to 0.085 W / (mK), more preferably less than or equal to 0.065 W / mK
• the aforementioned dry composition but more especially formulated for the preparation of a mineral coating foam, is characterized in that it comprises:
• At. l at least one mineral hydraulic binder (egcimentaire) and optionally at least one organic binder, preferably a mineral hydraulic binder selected from the group of Portland cements, aerial or hydraulic lime, aluminous cements (eg sulfo-aluminous cements and cations based on calcium aluminates), calcium sulphates and mixtures thereof,
• a mineral hydraulic binder selected from the group of Portland cements, aerial or hydraulic lime, aluminous cements (eg sulfo-aluminous cements and cations based on calcium aluminates), calcium sulphates and mixtures thereof
• cl at least one granulate (or structuring filler) preferably selected from the group consisting of sands, siliceous iron, limestone, silico-limestone, rubber granules, and mixtures thereof,
• At least one light filler preferably selected from the group consisting of the following products: vermiculite, perlite, expanded glass beads, expanded polystyrene beads, expanded polymer beads, cork granulates, hemp granules, expanded rhyolite, hollow spheres of alumina silicate, aggregates or powder of silica aerogels and mixtures thereof,
• an adjuvant which is different from the adjuvant (b1) and which may be a thickener, a water repellent, a set retarder, a setting accelerator, fibers or mixtures of these products e. at least one adjuvant other than the adjuvant (b1), as defined in the adjuvant (e) given above [eg water retainer (e ') - air entraining agent (e "). an adjuvant which is different from the adjuvant (b1) and which may be a thickener, a water repellent, a set retarder, a setting accelerator, fibers or mixtures of these
• the organic binder (a.1) if it is present, is rather chosen from acrylic and vinyl resins, preferably styrene-acrylic, acrylic, vinyl-ethylene acetate, vinyl-acetate / versatate / ethylene resins, and their mixtures.
• the binder (a.l) is slightly conductive and provides significant mechanical strength.
• the adjuvant (f l) has the role of providing a regularity of the properties of the material and makes it possible to fulfill the precise specifications specific to each coating (adjustment of the rheology and the implementation).
• the adjuvant other than the foaming admixture (b.l) may be a thickener, a water repellent, a set retarder, a setting accelerator, fibers or mixtures of these products.
• the thickener makes it possible to control the porosity of the material obtained, in particular in light cementitious products, to facilitate the incorporation of light aggregates and to improve the homogeneity of their volume distribution.
• It is for example chosen from the group of organic thickeners and / or from the group of mineral thickeners, preferably from the subgroup comprising: cellulose ethers, guar ethers, modified starches (eg starch ethers: hydroxypropyl-, hydroxyethyl -, carboxymethyl starches), xanthan gum, welan gum, succinoglycan gum, bentonite, sepiolite, montmorillonite, precipitated silica and mixtures thereof.
• the water-repellent is for example chosen from the group comprising: magnesium, calcium or aluminum stearate, sodium oleate, siloxane compounds and mixtures thereof.
• Retarders and setting accelerators are water-soluble products that modify the solubilities, dissolution rates and hydration of the various constituents of the binders.
• the setting retarder is, for example, chosen from the group comprising tartaric acid and its salts, preferably sodium or potassium salts, citric acid and its salts, preferably sodium salts (trisodium citrate) and their salts. mixtures.
• the setting accelerator is, for example, sodium carbonate and / or lithium carbonate.
• the fibers comprise polyamide, polyacrylonitrile polyacrylate, cellulose, polypropylene, glass, sisal, jute, hemp or blends thereof fibers.
• This dry composition of sprayable coating advantageously comprises (in% by weight and in increasing order of preference):
• composition (% by mass) is as follows:
• Air Trainer (e ".l): [0 - 1]
• composition systematically comprising a. l, b.l, cl, d. l, e.l.
• this dry composition is a one-component or two-component mixture ready for use.
• the invention aims, on the one hand, the preparation of a projectable wet plaster mineral foam by mixing the aforementioned dry composition with water, and, on the other hand, this sprayable wet plaster mineral foam per se.
• the water content of this wet plaster mineral foam is expressed by a mixing ratio, that is to say a ratio of the mass of water introduced on the dry matter mass of the binder (a1) and the filler (C1, d1), which is for example the following, in increasing order of preference and in weight percent: [10-300]; [15-200]; [20-100].
• the above limits are defined by a maximum corresponding to the rate above which the fresh hydrated binder paste becomes a suspension and for which the binder grains sedimentent, and by minimum corresponding to the rate below which the binder is not sufficiently wet to form a homogeneous paste.
• the process can be a batch mixing, in which is mixed in the bowl of a spraying machine, water to a mixture ready for use.
• the mixing time is preferably 1 to 15 minutes, or even 3 to 10 minutes. This process is easy to implement by building practitioners.
• Another object of the invention is the application by projection onto a building surface, preferably a wall, and more particularly a wall of monomur type support in brick or cellular concrete, the mineral foam coating defined above.
• This wall application can be carried out for new buildings as well as for buildings under renovation.
• the application according to the invention is easy.
• the present invention also relates to a coating obtained by the above application and having at least one of the following properties:
• thermal conductivity ⁇ less than or equal to 0.08 W m ⁇ K -1 and preferably less than 0.065 W m -1 K -1 ,
• ⁇ density d d less than or equal to 1, preferably 0.5
• ⁇ water retention greater than or equal to 80%, preferably 90%
• ⁇ setting time between 5 and 20 hours, preferably between 10 and 14 hours, at 5 ° C and 30 ° C.
• Another object of the invention consists in the supports, taken as such, coated with the aid of the coating according to the invention and in the building / civil engineering works, taken as such, obtained from the using the coating according to the invention.
• the foam technology according to the invention makes it possible to develop sprayable and / or spreadable coating foams with the following properties:
• the dry composition specially formulated for the preparation of an acoustic coating foam is characterized in that it comprises:
• a.2 at least one mineral hydraulic binder (egcimentaire) and optionally at least one organic binder, preferably a mineral hydraulic binder selected from the group of Portland cements, aerial or hydraulic lime, aluminous cements (eg sulfo-aluminous cements and calcium aluminate-based cements), calcium sulphates and mixtures thereof,
• a mineral hydraulic binder selected from the group of Portland cements, aerial or hydraulic lime, aluminous cements (eg sulfo-aluminous cements and calcium aluminate-based cements), calcium sulphates and mixtures thereof,
• c.2 at least one granulate preferably selected from the group consisting of sands, siliceous iron, limestone, silico-limestone, rubber granules, and mixtures thereof
• the binder a.2, the aggregate c.2 (or structuring charge), the adjuvant e.2 are advantageously of the same type as a. It is described above for sprayable plaster foams.
• This dry composition of acoustic coating advantageously comprises (in% by weight and in increasing order of preference):
• this dry composition is a one-component or two-component mixture ready for use.
• the invention aims, on the one hand, the preparation of a spreadable wet acoustic coating foam, by mixing the aforementioned dry composition with water, and, on the other hand, this foam is sprayable wet per se.
• the water content of this coating foam is expressed by a mixing ratio, that is to say a ratio of the mass of water introduced on the mass of dry matter of the binder (a.2) and the load (c.2 ), which is for example the following, in increasing order of preference and in percentage by weight:
• the above limits are defined by a maximum corresponding to the rate above which the fresh hydrated binder paste becomes a suspension and for which the binder grains settle, and by a minimum corresponding to the rate below which the binder is not wet enough to form a homogeneous paste.
• the process can be a batch mixing, in which is mixed with a mixing plant in the bowl of a machine, water to a mixture ready for use.
• the mixing time is preferably 1 to 15 minutes, or even 3 to 10 minutes. This process is easy to implement by building practitioners.
• Another object of the invention is the application by spreading on a building surface, preferably a floor, of the coating defined above.
• the application according to the invention is easy.
• the present invention also relates to an acoustic coating obtained by the aforementioned application and having at least one of the following properties:
• noise attenuation (acoustic insulation) ⁇ 1> 4, preferably> 6.
• Another object of the invention consists in the supports, taken as such, coated with the acoustic coating foam according to the invention and in the building / civil engineering works, taken as such, obtained using the acoustic coating according to the invention.
• These structures may be prefabricated elements such as panels or premurs, in which the filling material is constituted at least in part by the acoustic coating foam according to the invention.
• the foam technology according to the invention makes it possible to develop fireproof mortars with a density dd less than or equal to 2, preferably 1.5, as well as fire resistance properties.
• the dry composition specially formulated for the preparation of a fire-resistant mortar foam is characterized in that it comprises:
• a.3 at least one mineral hydraulic binder (cement) and optionally at least one organic binder, preferably a mineral hydraulic binder selected from the group of Portland cements, aerial or hydraulic lime, aluminous cements (sulfo-aluminous cements and cations based on calcium aluminates), calcium sulphates and mixtures thereof,
• c.3 at least one refractory and lightening filler preferably selected from the group comprising chamottes, perlites, vermiculites and mixtures thereof,
• d.3 at least one adjuvant other than adjuvant (b.3), meeting the definition of adjuvant (e.) given above,
• an adjuvant that is different from the adjuvant (b.3) and that may be a thickener, a water repellent and a mixture of these products.
• the binder a.3, and the adjuvant e.3 are advantageously of the same type as a.
• This dry fireproof mortar composition advantageously comprises (in% by weight and in increasing order of preference):
• this dry composition is a one-component or two-component mixture ready for use.
• Moist fireproof mortar foam
• the invention aims, on the one hand, the preparation of a fireproof mortar mortar projectable by mixing the aforementioned dry composition with water, and, on the other hand, this fireproof mortar foam sprayable per se.
• the water content of this fireproof mortar foam is expressed by a mixing ratio, that is to say a ratio of the mass of water introduced on the mass of dry matter of the binder (a.3) and the charge (c.3, d.3), which is for example the following, in increasing order of preference and in percent by weight: [10-300]; [15-200]; [20-100].
• the above limits are defined by a maximum corresponding to the rate above which the fresh hydrated binder paste becomes a suspension and for which the binder grains settle, and by a minimum corresponding to the rate below which the binder is not wet enough to form a homogeneous paste.
• the process can be a batch mixing, in which is mixed in the bowl of a spraying machine, water to a mixture ready for use.
• the mixing time is preferably 1 to 15 minutes, or even 3 to 10 minutes. This process is easy to implement by building practitioners.
• Another object of the invention is the application by projection on a building surface, preferably a wall and more particularly a wall type support monomur brick or cellular concrete, fireproof mortar foam defined above.
• This wall application can be performed for both new buildings and for buildings under renovation, for example tunnels.
• the application according to the invention is easy.
• the present invention also provides a fire resistant coating obtained by the above application having a density dd less than or equal to 2, preferably 1.5.
• a fire resistant coating obtained by the above application having a density dd less than or equal to 2, preferably 1.5.
• Another object of the invention consists in the supports, taken as such, coated with the aid of the fireproof mortar according to the invention and in the building / civil engineering works, taken as such, obtained at using the fireproof mortar foam according to the invention.
• These structures may be prefabricated elements such as panels or pre-walls, in which the filler material is constituted at least in part by the fireproof mortar foam according to the invention.
• micronized anhydrite SMA micronized micronized anhydrite
• perlite perlite 5mm plasterboard
• citric acid anhydrous citric acid fine grain 150/600 microns from Gadot Biochemical
• Thickener Welan gum and diutan: Kelcocrete CP from CP Kelco company: 2_- _M_O of operation:
• Example 2 Example3 Mixing rate (%) 65.4 59 60.8 d 28 days (Kg / L) 0.37 0.39 0.45 ⁇ Watt / (m.K) ) 0.085 0.098 0.104
• micronized anhydrite SMA micronized micronized anhydrite
• aerial lime chaubor CL90-S Lhoist b.
• PAREXLANKO foaming agent c.1 sands and fillers:
• perlite perlite 5mm plasterboard
• citric acid anhydrous citric acid fine grain 150/600 microns from Gadot Biochemical
• thickener Welan gum and diutan: kelcocrete CP from CP Kelco : 2_- Operating Mo:
• 15 Kg of powder comprising the binder, the sands or oils, the air-entraining aid, the adjuvants are prepared and mixed for 2 minutes on a Lodige laboratory mixer. The light loads are weighed separately.
• the 15 Kg of powder obtained is mixed on a Turbomalt control System mixer.
• the mixing water is introduced beforehand into the tank.
• the powder is gradually incorporated.
• the mixing time is 4 minutes, the start of mixing being taken at the end of the introduction of the powder.
• the light loads are then introduced gradually.
• the paste obtained is then transferred to a Mac Edil conveyor used with an independent compressor set at 6 bars, a pipe 5 m in diameter 25 mm, a decorative lance with a nozzle of 12 mm and projected.
• the product is characterized in the mixer tank and then lance outlet. : _3- Measurement , properties . : .
• - d c tank density of the dough in the mixer tank in Kg / L.
• - d s i lance outlet density of the recovered dough at the lance outlet after projection in Kg / L.
• Alumina powder of D50 10 to 20 ⁇ and specific surface area BET 270 - 340 m2 / g content> 93.5% Axilat SA 502 from Hexion Specialty Chemicals BV - Lithium carbonate with a minimum content of 99% apparent density 0.80 and
• a premix of 2 kg consisting of adjuvants c; is prepared. After weighing, the compounds are mixed for 3 minutes in a Guedu laboratory blender (4.5NO model) with a capacity of 3.5 liters at a speed between 545 and 610 rpm. The mixture is then sieved successively in 3 sieves (315 ⁇ , 250 ⁇ and 160 ⁇ of Saulas brand).
• a 10 kg bag is spoiled in a plastic bucket. Half of the water is introduced into the bucket, then the powder is poured. Blending is done with a Bosch GRW 11E blender for 10 seconds at a speed 390 rpm, then for 4 minutes at a speed of 900 rpm. The rest of the water is coated added for 30 seconds at 390 rpm, and finally, the mixture ends with 30 seconds at 900 rpm.
• ⁇ ⁇ ⁇ Spread E measures the spread diameter on a glass plate of the floor coating with a CSTB ring (diameter 30 mm, height 50 mm). The realization of spreads are made at three deadlines: 5 minutes, 20 minutes and 30 minutes after the start of the spoil. The test is carried out according to standard NF EN 12706.
• ⁇ ⁇ ⁇ Gelation Tgel consists in determining, on a fixed date, the ability of the product to recover after being sheared. The test is carried out with a smooth metal rod of diameter 6mm and length approx. 30cm. Using the rod, the spreading made during the previous test is sliced at maturity and it is observed whether the groove closes or not.
• Redispersible Copolymer e.2 iii
• the powder comprising the hydraulic binders (a), the LANKOSTAB®, the adjuvants (c) are prepared and mixed for 3 minutes on a Guedu laboratory mixer (model 4.5 NO) with a working capacity of 3.5 liters at a speed of between 545 and 610 rpm.
• Perlite and vermex are added in a second time, and everything is homogenized manually. This not to refine the granulometry of the perlite.
• the powder comprising the hydraulic binders (a), the chamotte, the adjuvants (d.3) and (e.3) are prepared and mixed 90 seconds at high speed (rotation frequency: 50 Hz).
• Perlite and vermex are added in a second time in the mixer, and all is mixed again at very low speed (rotation frequency: 20 Hz) for 25 seconds. This not to refine the granulometry of the perlite.
• 4 kg of powder are collected and mixed on Perrier laboratory blender: 30 seconds at a speed of 60 rpm and again for 30 seconds at a speed of 60 rpm. Tempered product on _yard _ _: _
• the product is applied by projection machine type projection machine for plastering.
• the powder is poured into a mixing tank and the defined amount of water is introduced.
• a paste is homogenized for five minutes at slow speed.
• Composition Table 7 (% by mass)

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• 2010
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