RU2103242C1 - Foam concrete containing magnesia binder and method for its production - Google Patents

Foam concrete containing magnesia binder and method for its production Download PDF

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RU2103242C1
RU2103242C1 RU97112152A RU97112152A RU2103242C1 RU 2103242 C1 RU2103242 C1 RU 2103242C1 RU 97112152 A RU97112152 A RU 97112152A RU 97112152 A RU97112152 A RU 97112152A RU 2103242 C1 RU2103242 C1 RU 2103242C1
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foam
magnesium chloride
magnesite
concrete
solution
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RU97112152A
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RU97112152A (en
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Аркадий Анатольевич Виноградов
Владимир Николаевич Воронин
Александр Николаевич Мякишев
Григорий Михайлович Погребинский
Анатолий Михайлович Сизиков
Евгений Аркадьевич Студеникин
Анатолий Генрихович Тиль
Василий Викторович Хамаза
Владимир Михайлович Хлестунов
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Аркадий Анатольевич Виноградов
Владимир Николаевич Воронин
Александр Николаевич Мякишев
Григорий Михайлович Погребинский
Анатолий Михайлович Сизиков
Евгений Аркадьевич Студеникин
Анатолий Генрихович Тиль
Василий Викторович Хамаза
Владимир Михайлович Хлестунов
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Abstract

FIELD: production of building materials. SUBSTANCE: foam concrete has the following composition powdery waste resulting from roasting magnesite rock, aqueous magnesium chloride solution, finely crushed broken ceramic bricks as filler, foam-forming agent and foam-stabilizing agent. Used as foam-forming agent is non-ionogenic surfactant SYNTHANOL, while methyl cellulose in the form of MTS adhesive is used as foam-stabilizing agent. Components are taken in the following ratio, parts by weight: powdery waste resulting from roasting magnesite mineral, 75-100; finely ground broken ceramic bricks, 5-25; aqueous magnesium chloride solution with density 1200 kg/cu. m, 66-144; SYNTHANOL surfactant, 0.11-1.2; adhesive MTS used for fixing wall paper, 0.11-1.2. In order to increase strength and water resistance of foam magnesite while keeping low its density (500-600 kg/cu.m), composition comprises specially pre-treated finely ground broken ceramic bricks (pre-treatment resides in implementing with magnesium solution and heat treating) and powdery waste resulting from roasting magnesite mineral 75 which is either pre-calcined at 400-420 C or additionally ground. Solution for producing foam containing foam-forming and foam-stabilizing agents is prepared not with water but with aqueous magnesium chloride solution, the latter serving at the same time as agent for slaking magnesia binder. Foam mineralization treatment is carried out by dry technique, by mixing foam with dense magnesia concrete mix. Foam production and foam mineralization, i. e. production of foam/concrete mix, is carried out in one and the same foam generating/mixing apparatus provided with special activator. After removing free magnesium chloride, ready-made foam concrete articles containing magnesia binder are held in water for 1-3 days and dried. As a result of drying, foam concrete articles acquire reinforced structure and their moisture content due to sorption is reduced in 2-3 times. EFFECT: improved quality and higher efficiency. 19 cl, 4 tbl

Description

 The invention relates to the production of building materials and can be used for the manufacture of heat-insulating structural-heat-insulating and structural concrete intended primarily for housing construction.
Known foam concrete containing Portland cement or gypsum as a binder, ash, foaming agent and water in the following components consumption per 1 m 3 of foam concrete with a density of 500-600 kg / m 3 : a) Portland cement M-400 305 kg; ash 130 kg; foaming agent (amine oxide according to TU 6-01-1-396-88) 0.45 l; water 196 l; b) gypsum G - 6 + 10 490 kg; water 145 l; foaming agent (amine oxide) 0.4 l; sodium tripolyphosphate 0.15 kg [1].
Foam concrete is made by the method of dry "mineralization of foam", which consists in the preparation of foam of a given multiplicity and its mineralization with a dry binder with aggregate while mixing the foam concrete mixture. The resulting foam concrete at a density of 500 kg / m 3 at the age of 28 days has a compressive strength of 1.7 MPa on a cement binder and 1.2 MPa on gypsum. The thermal conductivity coefficient of this foam concrete is 0.083 - 0.087 W / (m K).
 The main disadvantage of the known foam concrete is the lack of compressive strength, since in accordance with GOST 21520 - 89 (small blocks of cellular concrete wall, technical conditions) it must be at least 2.5 MPa.
Closest to the proposed one is foam concrete and a method for its manufacture [2], where foam concrete with a magnesian binder is called foam magnesite, which contains caustic magnesite, bruise (fine-ground red ceramic brick), an aqueous solution of magnesium chloride with a density of 1.142 g / cm 3 , animal glue, rosin and caustic soda at the following consumption of components per 1 m 1 of foam magnesite with a density of 450-500 kg / m 3 , kg: caustic magnesite 200-225; hulp 100; a solution of magnesium chloride with a density of 1.142 g / cm 3 165-180; solid glue 0.15; rosin 0.075; alkali 0.01.
 The method of producing foam concrete on a magnesian binder consists of the following operations. Preparation of water, glue, rosin and alkali, using special multi-stage technology and on special equipment, glue-rosin emulsion; crushing red brick or other inert filler; joint grinding of filler and caustic magnesite in a ball mill, taken in a given ratio; preparation of an aqueous solution of magnesium chloride of a given density; preparation of a certain amount of foam in a special apparatus (emulsifier) from kleukanifolny emulsion; preparation by mixing a portion of caustic magnesite or a certain amount of a mixture of ground caustic magnesite and filler with a portion of a solution of magnesium chloride in a device called the authors of the solvent, dense magnesia-concrete mixture; mixing a dense magnesia-concrete mixture with foam in a special mixer to obtain a foam-magnesia concrete mixture; transportation of the foam-magnesia mixture to the place of molding and molding of products; extraction of finished products from molds; exposure of foam magnesite and supply to the warehouse of finished products.
The compressive strength of foam magnesite with a density of 450-500 kg / m 3 made on caustic magnesite without adding filler to the composition of the raw material mixture at the age of 28 days reaches 3.0 MPa, and with the indicated ratio of components, it corresponds to 1.5-2.0 MPa. With an increase in the ratio between magnesite and gemstone from 1: 0.5 to 1: 3, the compressive strength drops to 1 MPa. Sorption humidity of foam magnesite at 100% relative air humidity after 10 days, if absent from the composition of cement, reaches 21.5%, and when the content of cement is 50 wt.h. per 100 wt.h. magnesite - 11.5%. The thermal conductivity coefficient is independent of the composition of foam magnesite, however, the authors cite the values obtained only at elevated temperatures (60-140 o C) and only for magnesite with a density of 350 kg / m 3 .
 The main disadvantages of the proposed foam concrete on a magnesian binder and the method of its manufacture is: as in [1], insufficient compressive strength; a very complex operation for the preparation of a glucose-rosin emulsion, the success of which determines the quality of the foam and foam magnesite; complex technological and equipment design of foam magnesite manufacturing (three main apparatuses: emulsifier, solvent, mixer); There is no information on the water resistance of the proposed foam magnesite, although it is well known that concrete with a magnesian binder at a higher strength than Portland cement has a low water resistance.
 The objective of the invention is to develop a composition and method for the preparation of foam concrete with a magnesian binder, providing the necessary strength, water resistance and reduced thermal conductivity when used in its composition of affordable low-cost ingredients and simple low-energy and metal-intensive technologies.
 The specified technical result is achieved in that in a foam concrete with a magnesia binder containing caustic magnesite, an aqueous solution of magnesium chloride, a finely ground fight of ceramic brick, a foaming agent and a foam stabilizer, activated powdery magnesite firing waste is used as caustic magnesite, and nonionic foaming agent is non-ionic active substance, and as a stabilizer methyl cellulose in the following ratio of components, parts by weight: powdery firing waste magnesite 100; finely ground battle of ceramic brick 5-25; an aqueous solution of magnesium chloride 66-144; nonionic surfactant 0.11-1.2; methyl cellulose 0.11-1.2.
In this case, the powdered waste of magnesite firing is activated by calcination at a temperature of 400-420 o With or additional grinding to a specific surface of 0.44-0.46 m 2 / year
The finely ground battle of ceramic brick is pre-treated with a solution of magnesium chloride, and its specific surface is 0.34-0.35 m 2 / g.
 Moreover, foam concrete contains syntanol as a nonionic surfactant, and wallpaper glue as methyl cellulose.
The density of the aqueous solution of magnesium chloride is 1200 kg / m 3 .
 The specified technical result is also achieved by the fact that in the method of manufacturing foam concrete with a magnesian binder, including the preparation of foam, crushing of the filler — ceramic brick, grinding of the filler and caustic magnesite, the preparation of an aqueous solution of magnesium chloride of a given density, the mineralization of the foam, molding and aging, the preparation of foam is carried out mixing a foaming agent — a nonionic surfactant with a foam stabilizer — methylcellulose in a portion of an aqueous solution of chloride of magnesium, the finely ground battle of ceramic bricks is pre-mixed with the remaining part of the aqueous solution of magnesium chloride followed by high-temperature exposure, the powdered magnesite firing waste used as caustic magnesite is pre-activated by calcination or additional grinding and the foam is mineralized by introducing components into it with constant stirring components, while the ratio of components in the foam is as follows, parts by weight: powdery firing waste m agnesite 100; finely ground battle of ceramic brick 5-25; an aqueous solution of magnesium chloride 66-144; nonionic surfactant 0.11-1.2; methyl cellulose 0.11-1.2.
 At the same time, dry powdery magnesite firing waste and a finely ground ceramic brick fight are successively introduced into the foam with constant stirring for 2-3 minutes, and after the introduction of each component, the mixture is mixed for 1-2 minutes in a foam generator-mixer, and the foam concrete is obtained by foam mineralization in the same foam mixer, where the foam is preliminarily obtained.
 Moreover, from 1/6 to 1/3 of the total volume of an aqueous solution of magnesium chloride is used for the formation of foam, and the foam is obtained in a foam generator-mixer with a mixer in the form of a ruff from 400-1000 rpm and rotating around a vertical axis at a speed of 400-1000 rpm synthetic or metallic threads.
The finely ground battle of ceramic brick is mixed with a solution of magnesium chloride in the following ratio of parts by weight: finely ground battle of ceramic brick 100, a solution of magnesium chloride with a density of 1200 kg / m 3 11-13, water 19-21, followed by exposure at a temperature of 105-120 o C to constant weight.
Before use, the powdered waste of firing magnesite is calcined at a temperature of 400-420 o C for 50-70 min or subjected to additional grinding to a specific surface of 0.44-0.46 m 2 / year
 The specified density of the foam concrete is ensured by controlling the multiplicity of the foam from 2 to 10, as well as by changing the ratio between the volume of the magnesium chloride solution for preparing the foam and the volume of the magnesium chloride solution for mixing the powdered waste of magnesite firing and the finely ground battle of ceramic bricks.
 The regulation of the multiplicity of the foam is carried out by changing the speed of rotation of the activator of the foam or by selecting the amount and type of foaming agent.
Molded products at the age of 7 days are soaked in water by immersion for 1-3 days and then dried at a temperature of not more than 120 o C.
Typically, the filler is introduced to reduce the consumption of binder, and therefore reduce the cost of foam concrete on a magnesian binder, however, the strength characteristics of foam magnesite are deteriorated [2]. The authors in the specified composition of foam concrete found the optimal ratio when introducing a finely ground battle of ceramic brick with a specific surface area of 0.34-0.35 m 2 / g, in which the strength characteristics deteriorate slightly (filler content 5-45 parts by weight), the introduction of filler even increases the strength of foam concrete. When using ceramic bricks pre-treated with an aqueous solution of magnesium chloride as a filler of a finely ground battle, the strength characteristics of foam concrete on a magnesian binder containing 5-25 wt.h. filler increase by 20-25% compared with foam, prepared using unprocessed bischofite filler.
The authors also found that as a component of a magnesian binder containing active magnesium oxide that can be cured by interaction with an aqueous solution of magnesium chloride, powdered waste of magnesite firing can be used, for example, caustic magnesite powder, including PMK-75, manufactured Magnezit JSC (Sadka, Chelyabinsk Region), however, in order to obtain foam concrete with good strength characteristics, this waste, especially PMK-75, must first be calcined at a temperature D 400-420 o C or subjected to further milled to a specific surface of 0,44-0,46 m 2 / g.
 The features of the proposed method for the manufacture of foam concrete on a magnesian binder with the above ratio of components is the following.
1. A finely ground battle of ceramic brick is ground to a specific surface of 0.34-0.35 m 2 / g and mixed with a solution of magnesium chloride before use, followed by processing at elevated temperature.
2. Foam is obtained from a solution of a foaming agent (necessarily a non-ionic type, for example, syntanol) with methyl cellulose, for example, MC glue, as a foam stabilizer that provides foam stability for at least the setting time of a magnesian binder, not in water, but in an aqueous solution of chloride magnesium with a density of 1200 kg / m 3 simultaneously being the mixing medium used by the authors of the type of caustic magnesite, for example PMK-75.
 3. Before use, the powdered waste of magnesite firing, for example PMK-75, is necessarily activated by calcination or additional grinding.
 4. During foam mineralization by the method of "dry mineralization", that is, when the pre-prepared foam with constant stirring is successively mixed with dry powdered waste of firing of magnesite and a finely ground fight of ceramic brick, the production of foam-magnesia concrete mixture is carried out in the same machine where the foam, foaming agent was made and the foam stabilizer is dissolved in an aqueous solution of magnesium chloride, taken in the amount necessary for mixing the binder, and in addition, by changing the amount of aqueous solution creates magnesium chloride adjusted as density penomagnezitnoy mixture and foam.
 5. During the mineralization of the foam by mixing with constant stirring the previously prepared dense magnesia concrete mixture containing the filler and the foam, everything necessary for mixing the magnesia binder is divided into two parts, one of which is used to prepare a dense magnesia concrete mixture, and the second after dissolving the foaming agent and stabilizer in it is used to prepare the foam, mixing the foam and a dense magnesia concrete mixture, which The ash was prepared in a typical concrete mixer, produced in an apparatus for making foam, and the change in the ratio between the parts of the magnesium chloride solution consumed for preparing the concrete mixture and the foam reaches the given density of the foam concrete mixture and foam concrete.
 6. When using any of the above methods of mineralization of foam, the density control of the foam concrete mixture and foam concrete is carried out by changing the multiplicity of the foam, which can be changed by changing and / or the concentration of the foaming agent in the solution to produce foam and / or by changing the number of revolutions of the activator of the foam generator.
 7. Actually, both foam and foam-magnesia concrete mix with any method of mineralization is produced in the same apparatus, called a foam generator-mixer, one of the nodes of which is swinging in two planes and rotating around a vertical axis at a speed of 400-1000 rpm activator in the form of a ruff made of polymer or metal threads.
8. Soaking from molded products made of foam concrete on a magnesian binder in water for a period of 3 days and subsequent drying at a temperature of not more than 120 o C reduce by 2-2.5 times in products further sorption humidity and improves strength characteristics.
It was experimentally established that to ensure increased strength of foam concrete during preliminary processing of fine-ground battle of ceramic brick, it is advisable to mix it with a solution of magnesium chloride with a density of 1200 kg / m 3 with the following ratios of components, parts by weight: fine-ground battle of ceramic brick 100; a solution of magnesium chloride with a density of 1200 kg / m 3 11-13; water 19-20.
It is advisable to heat-treat the finely ground ceramic brick prepared in this way at a temperature of 105-120 o C to constant weight. Additional studies of concrete on a magnesian binder in a dense (analogous to the properties of inter-pore partitions) state established the influence of fine-grained battle of ceramic bricks not only on the strength of concrete in compression and bending, but also that with an increase in the filler content from 5 to 30 parts by weight water absorption decreases by 3-3.5 times, the softening factor (water resistance) increases from 0.4-0.6 (without filler) to 0.93-0.98 (with filler). Based on a comprehensive study of the properties of concrete by chemical-physical methods and the differential thermal analysis method (derivatography), it was suggested that fine-grained ceramic bricks form on the surface of the particles when heated in the presence of a solution of magnesium chloride, surface compounds that affect the interaction of the filler and magnesian binder.
The effect of pretreatment of powdered magnesite roasting waste (PMK-75) by calcination or grinding in accordance with GOST 1216-87 was evaluated by the start and end setting time of the magnesia test of normal density and strength of dense concrete. It was found that the greatest increase in concrete strength at the age of 28 days and a decrease in the start and end time of setting occurs when calcining PMK-75 at a temperature of 400-420 o C for 50-70 min with additional grinding to a specific surface of 0.44-0.46 m 2 / g (with an initial specific surface of MPK-75-0.34 m 2 / g).
 The proposed composition and method of preparation of foam concrete on a magnesian binder allows to obtain foam concrete suitable for the manufacture of small wall blocks, as well as for the construction of external and internal walls in a monolithic low-rise building and has the following characteristics.
Density, kg / m 3 - from 500 to 1200
Compressive strength, MPa - from 3.5 to 18
Water resistance - 0.93-0.98
Sorption humidity with relative humidity
60% - 3.8-9.7
97% - 10.6-15.2
The coefficient of thermal conductivity with a sample moisture of 8%, W / m o С - 0.167-0.540
Frost resistance, not less than freeze-thaw cycles - 35
Water absorption when a sample is immersed in water for 1 day, wt.% - 30-105
Example 1. 1. In a foam generator-mixer equipped with an activator in the form of a ruff made of polymer or metal threads swaying in two planes and rotating around a vertical axis, an aqueous solution of magnesium chloride with a density of 1200 kg / m 3 prepared from technical magnesium chloride (bischofite) is loaded meeting the requirements of GOST 7759-73 and tap water. The amount of solution 140 wt.h.
2. Not including the activator, add 1.2 wt.h. to the foam mixer. syntanol (brand ACSE, AO Caprolactam, TU 6-14-819-88) previously dissolved at 50-60 o C in 4 wt.h. an aqueous solution of magnesium chloride with a density of 1200 kg / m 3 .
 3. Not including the activator, add 12 parts by weight to the foam generator-mixer. wallpaper adhesive MC (JSC Usoliekhimprom. TU 6-02-20-44890), prepared by pre-soaking the pulp of methyl cellulose in water for 6 hours at room temperature and a ratio of methyl cellulose water of 1: 10.
 The activator drive is turned on and a rotation speed of 400 rpm is set.
 After 3 minutes of intensive exposure of the activator to the solution of the foaming agent and stabilizer in magnesium chloride, a foam of 4.5 multiplicity is obtained.
6. Without turning off the activator’s drive, in 2-3 minutes add magnesite caustic powder PMK-75 (Magnesite JSC, GOST 1216-87) to the foam generator-mixer, preliminarily calcined for 1 h at 420 o in the amount of 100 wt.h. and continue mixing for another 1-2 minutes.
7. Without turning off the activator drive, for 2-3 minutes add to the foam generator-mixer a finely ground battle of ceramic brick with a specific surface area of 0.34-2.35 m 2 / g in an amount of 25 parts by weight and continue to mix for another 1-2 minutes.
 8. The finished foam concrete mixture is poured into molds (or laid into the formwork with a monolithic method of construction).
 9. After 15-16 hours, the castings reach the formwork strength, and the products are removed from the molds (formwork is removed).
 10. In the future, the product is placed in a warehouse of finished products and stored at room temperature and natural humidity, protecting it from direct ingress of water for 7 days. During this time, they gain 80-95% of the strength of the strength at the age of 28 days and are presented for sale to consumers.
Example 2. The sequence of operations in the preparation of concrete mixture and the number of ingredients is similar to example 1 for all points. However, according to claim 7, 25 parts by weight are added to the foam generator-mixer. finely ground battle of ceramic brick, pre-mixed with a solution of magnesium chloride and water in the following ratio of components, parts by weight: finely ground battle of ceramic brick 100; a solution of magnesium chloride with a density of 1200 kg / m 3 13; water 19 and aged at 120 o C to constant weight.
 The properties of foam concrete at the age of 28 days are given in table. one.
 Example 3. The preparation of the concrete mixture was carried out analogously to example 1, however, 15 parts by weight were added to the foam generator-mixer. fine-grained battle of ceramic bricks.
 The properties of foam concrete at the age of 28 days are given in table. one.
 Example 4. The preparation of the foam concrete mixture was carried out analogously to example 1, however, 5 parts by weight were added to the foam generator-mixer. fine-grained battle of ceramic bricks.
 The properties of foam concrete at the age of 28 days are given in table. one.
 Example 5. The preparation of the foam concrete mixture was carried out analogously to example 2, however, 5 parts by weight were added to the foam generator-mixer. finely ground battle of ceramic bricks, pre-treated with a solution of magnesium chloride.
 The properties of foam concrete at the age of 28 days are given in table. one.
 Example 6. The preparation of the foam concrete mixture was carried out analogously to example 2, however, 15 parts by weight were added to the foam generator-mixer. finely ground battle of ceramic bricks, pre-treated with a solution of magnesium chloride.
 The properties of foam concrete at the age of 28 days are given in table. one.
Example 7. The preparation of the foam concrete mixture was carried out analogously to example 2, however, 15 parts by weight were added to the foam generator-mixer. finely ground battle of ceramic brick, pre-mixed with water in the following ratio of components, parts by weight: finely ground battle of ceramic brick 100; water 32 and aged at 120 o C to constant weight.
 The properties of foam concrete at the age of 28 days are given in table. one.
Example 8. The preparation of the foam concrete mixture was carried out analogously to example 2, however, 25 parts by weight were added to the foam generator-mixer. finely ground battle of ceramic brick, pre-mixed with a solution of magnesium chloride and water in the following ratio of components in parts by weight: finely ground battle of ceramic brick 100; a solution of magnesium chloride with a density of 1200 kg / m 3 11; water 21 and aged at a temperature of 105 o C to constant weight.
 The properties of foam concrete at the age of 28 days are given in table. one.
Example 9. The preparation of the foam concrete mixture was carried out analogously to example 1, however, 62 parts by weight were added to the foam generator-mixer. a solution of magnesium chloride with a density of 1200 kg / m 3 , 0.11 wt.h. syntanol previously dissolved in 4 parts by weight a warm solution of magnesium chloride with a density of 1200 kg / m 3 at 50-60 o C and 2.2 wt.h. MC glue prepared by pre-soaking the pulp of methyl cellulose in water for 6 hours at room temperature and a ratio of methyl cellulose: water equal to 1:20.
 The properties of foam concrete at the age of 28 days are given in table. one.
Example 10. The preparation of the foam concrete mixture was carried out analogously to examples 1 and 2, however, 100 parts by weight were added to the foam generator-mixer. a solution of magnesium chloride with a density of 1200 kg / m 3 , 0.5 wt.h. syntanol previously dissolved in 4 parts by weight a warm solution of magnesium chloride with a density of 1200 kg / m 3 at 50-60 o C and 6 wt.h. MC glue prepared at a ratio of methyl cellulose: water equal to 1:15.
 The properties of foam concrete at the age of 28 days are given in table. one.
 Example 11. The preparation of the foam mixture is carried out analogously to example 1, however, 100 parts by weight are added to the foam generator-mixer. PMK-75, not subjected to additional processing.
The properties of foam concrete at the age of 28 days are given in table. 1. Example 12. The preparation of the foam concrete mixture is carried out analogously to example 1, however, 100 parts by weight are added to the foam generator-mixer. PMK-75 subjected to additional grinding to a specific surface of 0.44-0.46 m 2 / year
 The properties of foam concrete at the age of 28 days are given in table. one.
Example 13. 1. In a forced-action mortar mixer load 100 wt. including PMK-75, previously subjected to calcination at a temperature of 410 o C for 70 minutes 25 parts by weight finely ground battle of ceramic brick, pre-treated with a solution of magnesium chloride (see example 2) and 96 wt. including an aqueous solution of magnesium chloride with a density of 1200 kg / m 3 . The mixture is stirred until smooth (2-3 minutes).
2. In the foam generator-mixer (see example 1 download 44 parts by weight of a solution of magnesium chloride with a density of 1200 kg / m 3 and 0.6 parts by weight of syntanol previously dissolved in 4 parts by weight of a solution of magnesium chloride with a density of 1200 kg / m 3 , and 12 parts by weight of MC glue wallpaper (see example 1).
 3. Turn on the drive of the foam generator-mixer, adjust the rotation speed to 1000 rpm and after 3 minutes of mixing, foam with a multiplicity of 4.5-5 is obtained.
 4. Without turning off the rotation of the activator, add a dense magnesia concrete mortar prepared in a mortar mixer.
 5. For 2-3 minutes of operation of the activator, the foam concrete mixture is homogenized.
 6. The finished foam concrete mixture is poured into molds or into the formwork with a monolithic method of construction, after a day the products are redistributed. Tempering strength (80-85% of the 28-day strength) was achieved in 7 days.
 7. The properties of foam concrete at the age of 28 days are given in table. one.
Example 14. The foam concrete mixture and foam concrete was prepared analogously to example 13, however, 108 wt.% Were taken to prepare a dense magnesian concrete solution. including a solution of magnesium chloride with a density of 1200 kg / m 3 and for the manufacture of foam 36 wt.h. magnesium chloride solution.
 The properties of foam concrete at the age of 28 days are given in table. one.
Example 15. Foam concrete mixture and foam concrete prepared analogously to example 13, however, to prepare a dense magnesia concrete mortar taken 120 wt. including a solution of magnesium chloride with a density of 1200 kg / m 3 and for the manufacture of foam 24 wt.h. magnesium chloride solution.
 The properties of foam concrete at the age of 28 days are given in table. one.
 Example 16. The foam concrete mixture and foam concrete was prepared analogously to example 1, but without the use of ceramic bricks as a filler of finely ground battle.
 The properties of foam concrete at the age of 28 days are given in table. one.
Example 17. In the foam mixer, we place 100 wt.h. an aqueous solution of magnesium chloride, the density of 1200 kg / m 3 and 0.11-1.2 wt.h. syntanol in the form of a pre-prepared solution in 4 wt.h. heated solution of magnesium chloride and 12 wt. including wallpaper glue MC in the form of a water-saturated state with a ratio of methyl cellulose: water equal to 1:10. After activating the activator, the rotation speed is set to 600 rpm. After 3 minutes, the multiplicity of the foam is measured. The test results are given in table. 2.
Example 18. In the foam mixer is placed 100 wt.h. an aqueous solution of magnesium chloride, the density of 1200 kg / m 3 and 0.6 wt.h. syntanol in 4 parts by weight a solution of magnesium chloride and 12 wt.h. MC glue (methyl cellulose: water = 1: 10). After activator activation, the rotation speed is set at 400, 600, 800, 1000 rpm. Mixing time at each speed 3 min. The results of determining the multiplicity of the foam are given in table. 3.
Example 19. By the method of examples 2, 9, 10, foam concrete products were obtained which, after reaching the age of 7 days, were immersed in water for 3 days. After extracting the samples from water, they were dried at a temperature of not more than 120 o C (from room temperature to 120 o C). The test results of the samples before and after processing are given in table. 4.

Claims (18)

 1. Foam concrete on a magnesian binder containing caustic magnesite, an aqueous solution of magnesium chloride, a finely ground ceramic brick fight, a foaming agent and a foam stabilizer, characterized in that, as caustic magnesite, it contains activated powdery magnesite firing waste, a non-ionic, surface-active substance as a foaming agent and as a stabilizer methyl cellulose in the following ratio, wt.h.
Powdered magnesite firing waste 100
Fine-milled battle of ceramic bricks 5 25
Aqueous solution of magnesium chloride 66 144
Nonionic Surfactant 0.11 1.2
Cellulose 0.11 1.2
2. Foam concrete under item 1, characterized in that it contains a powdery waste of magnesite firing, activated by calcination at a temperature of 400 - 420 o C.
3. Foam concrete according to claim 1, characterized in that it contains a powdery magnesite firing waste activated by additional grinding to a specific surface of 0.44 0.46 m 2 / g.
 4. Foam concrete under item 1, characterized in that the finely ground battle of ceramic brick is pre-treated with a solution of magnesium chloride.
5. Foam concrete according to claim 1, characterized in that the specific surface of the finely ground battle of ceramic brick is 0.34 0.35 m 2 / g.
 6. Foam concrete according to claim 1, characterized in that it contains syntanol as a nonionic surfactant.
 7. Foam concrete under item 1, characterized in that as methyl cellulose contains wallpaper glue.
8. Foam concrete under item 1, characterized in that the density of the aqueous solution of magnesium chloride is 1200 kg / m 3 .
 9. A method of manufacturing a foam concrete on a magnesian binder, including the preparation of foam, crushing of ceramic brick filler, grinding of filler and caustic magnesite, preparation of an aqueous solution of magnesium chloride of a given density, foam mineralization, molding and curing, characterized in that the foam is prepared by mixing a nonionic surfactant - an active substance with a foam stabilizer methylcellulose in part of an aqueous solution of magnesium chloride, a finely ground ceramic battle bricks are pre-mixed with the remaining part of an aqueous solution of magnesium chloride followed by high-temperature exposure, the powdered magnesite firing waste used as caustic magnesite is pre-activated by calcination or additional grinding and the foam is mineralized by introducing components into it with constant mixing of the components, while the ratio of the components in foam concrete the following, parts by weight
Powdered magnesite firing waste 100
Fine-milled battle of ceramic bricks 5 25
Aqueous solution of magnesium chloride 66 144
Nonionic Surfactant 0.11 1.2
Cellulose 0.11 1.2
10. The method according to p. 9, characterized in that dry powdery magnesite firing waste and finely ground ceramic brick batch are successively introduced into the foam with constant stirring for 2 3 minutes, and after the introduction of each component, the mixture is mixed for 1 2 min in a foam generator mixer.
 11. The method according to p. 10, characterized in that the foam concrete is obtained by mineralizing the foam in the same foam generator-mixer, where the foam is preliminarily obtained.
 12. The method according to p. 9, characterized in that for the formation of foam using 1/6 1/3 of the total volume of an aqueous solution of magnesium chloride.
 13. The method according to p. 9, characterized in that the foam is obtained in a foam generator-mixer with a mixer in the form of a ruff made of synthetic or metallic threads, which sways in two planes and rotates around a vertical axis at a speed of 400-1000 rpm.
 14. The method according to p. 9, characterized in that the finely ground battle of ceramic brick is mixed with a solution of magnesium chloride in the following ratio of components, parts by weight
Fine-milled battle of ceramic bricks 100
A solution of magnesium chloride with a density of 1200 kg / m 3 11 13
Water 19 21
followed by exposure at a temperature of 105 120 o C to constant weight.
15. The method according to p. 9, characterized in that before using the powdery waste of calcination of magnesite is calcined at a temperature of 400 - 420 o C for 50 to 70 minutes
16. The method according to p. 9, characterized in that before use, the powdered waste of firing of magnesite is subjected to additional grinding to a specific surface of 0.44 0.46 m 2 / g
 17. The method according to p. 9, characterized in that the predetermined density of the foam is provided by adjusting the multiplicity of the foam from 2 to 10.
 18. The method according to p. 17, characterized in that the regulation of the multiplicity of the foam is carried out by changing the speed of rotation of the activator of the foam or by selecting the amount and type of foaming agent.
 19. The method according to p. 9, characterized in that the predetermined density of the foam concrete is provided by changing the ratio between the volume of a solution of magnesium chloride to prepare the foam and the volume of a solution of magnesium chloride to mix the powdery waste of firing magnesite and finely ground ceramic brick.
20. The method according to p. 9, characterized in that the molded product at the age of 7 days is soaked in water by immersion for 1 to 3 days and then dried at a temperature of not more than 120 o C.
RU97112152A 1997-07-28 1997-07-28 Foam concrete containing magnesia binder and method for its production RU2103242C1 (en)

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WO2001042164A1 (en) * 1999-12-10 2001-06-14 James Hardie Research Pty Limited Lightweight wall construction
ITMI20081959A1 (en) * 2008-11-06 2010-05-07 Massimo Cottafava Use of crushed ceramic aggregates from the recovery processes of fired ceramic waste for the preparation of concrete, bituminous conglomerates, cement conglomerates and related derivative conglomerates of different formulations
EP2385028A1 (en) * 2010-05-03 2011-11-09 Massimo Cottafava Use of crushed ceramic aggregates coming from baked ceramic reject recovery processes for the preparation of concrete, bituminous conglomerates, cementitious conglomerates and relative conglomerate derivatives having different formulations
RU2544934C1 (en) * 2013-08-12 2015-03-20 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Тюменский государственный архитектурно-строительный университет" (ФГБОУ ВПО "ТюмГАСУ") Heat-insulating material based on magnesite-carnallite binding agent
RU2544935C1 (en) * 2013-08-12 2015-03-20 федеральное государственное бюджетное образовательно учреждение высшего профессионального образования "Тюменский государственный архитектурно-строительный университет" (ФГБОУ ВПО "ТюмГАСУ") Heat-insulating material based on magnesite-carnallite binding agent
RU2584907C1 (en) * 2015-02-05 2016-05-20 Геннадий Геннадьевич Лосев Method of heat and moisture treatment of concrete articles

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RU2544353C1 (en) * 2014-02-20 2015-03-20 федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Тюменский государственный университет" Heat-insulation material based on magnesite-carnallite binder
RU2557025C1 (en) * 2014-07-03 2015-07-20 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Тюменский государственный архитектурно-строительный университет" Heat-insulating constructional material based on magnesite- carnallite binder

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001042164A1 (en) * 1999-12-10 2001-06-14 James Hardie Research Pty Limited Lightweight wall construction
ITMI20081959A1 (en) * 2008-11-06 2010-05-07 Massimo Cottafava Use of crushed ceramic aggregates from the recovery processes of fired ceramic waste for the preparation of concrete, bituminous conglomerates, cement conglomerates and related derivative conglomerates of different formulations
EP2385028A1 (en) * 2010-05-03 2011-11-09 Massimo Cottafava Use of crushed ceramic aggregates coming from baked ceramic reject recovery processes for the preparation of concrete, bituminous conglomerates, cementitious conglomerates and relative conglomerate derivatives having different formulations
EP2620420A1 (en) * 2010-05-03 2013-07-31 Cattalini, Mariella Use of crushed ceramic aggregates coming from baked ceramic reject recovery processes for the preparatiaon of concrete, bituminous conglomerates, cementitious conglomerates
RU2544934C1 (en) * 2013-08-12 2015-03-20 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Тюменский государственный архитектурно-строительный университет" (ФГБОУ ВПО "ТюмГАСУ") Heat-insulating material based on magnesite-carnallite binding agent
RU2544935C1 (en) * 2013-08-12 2015-03-20 федеральное государственное бюджетное образовательно учреждение высшего профессионального образования "Тюменский государственный архитектурно-строительный университет" (ФГБОУ ВПО "ТюмГАСУ") Heat-insulating material based on magnesite-carnallite binding agent
RU2584907C1 (en) * 2015-02-05 2016-05-20 Геннадий Геннадьевич Лосев Method of heat and moisture treatment of concrete articles

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