Method to prepare gypsum cement pozzolan binder
SUBSTANCE: method to produce a gypsum cement pozzolan binder includes hydraulic activation of portland cement with surfactants for 1 minute with subsequent addition of gypsum and pozzolan component and repeated hydraulic activation for 2 minutes in a rotor-pulsation device with speed of shaft rotation of at least 5000 rpm, surfactants are a mixture of carboxylate polyester "Odolit-K", a controller of setting and hardening times "BEST-TB" and water emulsion of octyltriethoxysilane "Penta®-818" at the ratio of 1:0.23:0.07, the pozzolan component is metakaolin with hydraulic activity of at least 1000 mg/g at the following ratio of components, wt %: calcined gypsum 57-57.7, portland cement 14.9-15.3, specified surfactant 1.3-1.8, metakaolin 2.7-3.3, water - balance.
EFFECT: increased frost resistance, longer times of mixture setting, giving it self-compacting property, increased strength, higher water resistance and reduced water absorption.
The invention relates to the construction materials industry and can be used in the production of mixed binding agents on the basis of gypsum and Portland cement.
Known method of preparing a raw material mixture for construction products, including mechanical activation gipsotsementnyj binder with additives and water (EN 2044714 C1, IPC C04B 28/14, publ. 27.09.1995).
The disadvantage of this invention is the absence in its composition of pozzolanic component (active mineral additives), except for the parts contained in the Portland cement. This, depending on cement type and gipsotsementnyj ratio, can lead to the formation of ettringite, creating internal stresses in the solidified structure of the stone, resulting in a reduction of strength of products with long-term hardening. In addition, short setting time of the mixture reduces the time of its viability, which complicates the technological process of manufacturing products.
The closest solution to the technical essence and the achieved result to the proposed invention is a method for producing a binder comprising hydroactive of Portland cement in the presence of surface-active substances (surfactants) within 2-8 minutes in the activator are added into the mixture of semi-aquatic gypsum and spent silicagel� and mixing in the mixer (RU 2368580 C2, IPC C04B 11/30, publ. 27.09.2009).
The disadvantages of this method are complex technology implementation, which consists in the activation of Portland cement in hydroactive and stirring gipsotsementnyj-pozzolan composition in the mixer. Products obtained by this method have a low frost. The high cost of silica gel, and the instability of its characteristics that affect the homogeneity of the rheological, physico-mechanical and other properties gipsotsementnyj-pozzolanic composition. The use of high-quality Portland cement (M600) significantly increases the cost of the finished product. In addition, in the description of the above method does not show the test results of samples in bending, water absorption, not specified setting time of the mixture.
The object of the invention is to increase pot life of ready mix, the increase of strength properties in bending and compression, frost resistance and water resistance of the hardened gipsotsementnyj-pozzolanic binder (GCPW) on the basis of low-grade semi-aquatic gypsum and Portland cement for General construction purposes M400, while simplifying the manufacturing technology.
The technical result of the proposed solutions is to increase frost resistance, lengthening the setting time of the mixture, giving it a �lopatnica abilities higher limits of strength in bending and compression, increased water resistance and reduced water absorption of the hardened gipsotsementnyj-pozzolanic binder.
The result is achieved in that in the method of producing gipsotsementnyj-pozzolanic binder comprising hydroactive of Portland cement in the presence of surface-active substances (surfactants), adding to the resulting mixture of semi-aquatic gypsum and pozzolanic component and mixing until a homogeneous mass, according to the invention is hydroactive carried out in a rotary pulsation apparatus with the speed of rotation of the shaft is not less than 5000 Rev/min, hydroactive Portland cement to produce surfactant for 1 min, then add gypsum and pozzolanic component and produce a re-hydroactive within 2 minutes as a surfactant, a mixture of carboxylated polyester "Adalit-K, the regulator setting and hardening "BEST-TB and an aqueous emulsion of octyltriethoxysilane "Penta®-818" in the ratio of 1:0,23:0,07, as pozzolanic metakaolin component used with hydraulic activity is not less than 1000 mg/g, with the following ratio of components, wt.%:
|The specified surface-active substance||1,3-1,8|
The use of surfactants in the composition carboxylated polyester "Adalit-K reduces the water requirement of the mixture and increases the strength characteristics of products, the application of the regulator setting and hardening "BEST TB increases the pot life of ready mix, resulting in lengthening of the setting time. The combination of these carboxylated polyester with the regulator setting and hardening gives gipsotsementnyj-pozzolan mixtures of self-compacting ability. The use of surfactants in the composition an aqueous emulsion of octyltriethoxysilane "Penta®-818" promotes optimal pore structure of the hardened stone, reduces water absorption and increases the water resistance of the finished product.
The use of surfactants in the composition of the above components in the specified ratio leads to a synergistic effect and allows you to achieve the desired technical result.
For the manufacture gipsotsementnyj-pozzolan mixtures were used the following materials:
semi-aquatic gypsum brand GB produced by "Arakchinsky gypsum" (GOST 125-79);
�portlandcement PC 400 D0 N Volsk plant;
as a pozzolanic additive metakaolin with hydraulic activity is not less than 1000 mg/g (TU 5729-098-12615988-2013). To prepare the samples used metakaolin with hydraulic activity 1238 mg/g;
drinking tap water that meets the requirements of GOST 23732.
In the surfactant composition used:
- carboxylated polyester "Adalit-To" production LLC "Service-Groups" (TU 5745-01-96326574-08);
- the regulator setting and hardening "BEST-TB" production LLC "Innovative Technologies". "BEST-TB" refers to the superplasticizers of the first group and is a copolymer on the basis of esters of carboxylic acids with the addition of a phosphate component, a dark brown color with a density (at 20°C) to 1.24 g/cm3mass fraction of dry substances 20-30%;
- water emulsion of octyltriethoxysilane "Penta®-818" production company "Penta-An ITW Company - plastic 50% aqueous emulsion of octyltriethoxysilane density of 1000 kg/m3the content of active substance 50%.
The surfactant is prepared by mixing the indicated components in the indicated proportions.
The present invention is as follows.
The quantity of mixing water were selected from the conditions of normal density gipsotsementnyj-pozzolana mixture according to GOST 23789-79. To obtain the samples used surfactants of sledujuschtschaja, wt.%: carboxylated polyester "Adalit-To - 76,92; the regulator setting and hardening "BEST-TB - 17,95; the aqueous emulsion of octyltriethoxysilane "Penta®-818" - 5,13.
In operating rotary-pulsation apparatus pour the calculated amount of water to which is added a pre-prepared surfactants. Then produce weight dosage of Portland cement and carry out its hydroactive in a rotary pulsation apparatus with the speed of rotation of the shaft is not less than 5000 Rev/min for one minute in the presence of a surfactant, and then the resulting mixture was added a semi-aquatic gypsum and metakaolin and produce further mixing in a rotary pulsation apparatus until a homogeneous mass within 2 minutes.
From gipsotsementnyj-pozzolanic mixtures of samples produced beams with dimensions 4×4×16 cm
After 28 days of normal curing, the samples were subjected to mechanical tests. The strength of solidified samples, water absorption, as well as setting time gipsotsementnyj-pozzolan test was determined in accordance with GOST 23789-79. Frost products was determined in accordance with GOST 7025-91. The resistance of samples was determined by their softening coefficient, is the ratio limits the compressive strength of dry to water-saturated samples. For the criterion of self-compacting ability took the ability gipsies�/-pozzolana mixture to hold the entire volume of the form with the formation of smooth surfaces under its own weight without additional external influences.
Were also fabricated according to the prior art on the basis of Portland cement for General construction purposes M400.
The compositions gipsotsementnyj-pozzolan mixtures are shown in table 1, the results of mechanical tests of the samples are given in table 2.
The test results of the samples gipsotsementnyj-pozzolan mixtures according to the prior art on the basis of Portland cement for General construction purposes M400 are shown in table 2.
From these data it follows that the maximum values of the compressive strength and Flexural strength are achieved when the content of semi-aquatic gypsum within 57-57,7%, Portland cement is 14.9 and 15.3%, surfactant 1,3-1,8%, of metakaolin with hydraulic activity is not less than 1000 mg/g of 2,7-3,3%. When a surfactant in an amount of less than 1.3% of the observed decrease of the investigated properties in comparison with the claimed limits. With the introduction of surfactant in excess of 1.8%, the studied properties gipsotsementnyj-pozzolanic binder increase slightly.
The product obtained according to the invention have high mechanical properties, water resistance and frost resistance, low water absorption. The use of this surfactant allows to obtain self-compacting gipsotsementnyj-pozzolana mixture and improve its viability.
In addition, the manufacturing�the manufacture gipsotsementnyj-pozzolanic binder in a single apparatus and the use of low-grade semi-aquatic gypsum and Portland cement for General construction purposes M400 allows to simplify the technological process of manufacturing products and reduce their cost.
A method of producing gipsotsementnyj-pozzolanic binder comprising hydroactive of Portland cement in the presence of surfactants surfactants, adding to the resulting mixture of semi-aquatic gypsum and pozzolanic component and mixing until a homogeneous mass, characterized in that hydroactive carried out in a rotary pulsation apparatus with the speed of rotation of the shaft is not less than 5000 Rev/min, hydroactive Portland cement to produce surfactant for 1 min, then add gypsum and pozzolanic component and produce a re-hydroactive within 2 minutes, as a surfactant, a mixture of carboxylated polyester "Adalit-To", the regulator setting and hardening "BEST-TB and an aqueous emulsion of octyltriethoxysilane "Penta®-818" in the ratio of 1:0,23:0,07, as pozzolanic metakaolin component used with hydraulic activity is not less than 1000 mg/g, with the following ratio of components, wt.%:
|Portland||Of 14.9 and 15.3|
|The specified surface-active substance||1,3-1,8|
SUBSTANCE: method to prepare concrete mix includes double-stage mixing of a binder, fillers, a superplasticiser and tempering water, at the first stage they first mix the binder, fine filler, 70-80% of coarse filler and 75-85% of tempering water to produce a homogeneous mix, then at the second stage to the previously mixed mixtyre they add the remaining part of the coarse filler, superplasticiser with remaining part of the tempering water, and finally all components are mixed to produce a homogeneous concrete mix of required workability. The superplasticiser is additive of Cemaktiv SU-1.
EFFECT: reduced consumption of superplasticiser and provision of the possibility to reduce duration of heat and moisture treatment of concrete.
2 cl, 1 tbl
SUBSTANCE: in the method to prepare a haydite concrete mix, including preparation and mixing of mixture components, mixing of the haydite concrete mix is carried out in a turbulent concrete mixer with rotor rotation frequency of at least 8 sec-1 and not more than 30 sec-1, at first 30% of required tempering water is supplied into the turbulent concrete mixer, and gradually haydite gravel is loaded with the running turbulent mixer, and mixed for 120 sec., then the required balance of water is supplied to the continuously running turbulent concrete mixer with addition of technical modified lignosulphonates and a gas forming additive PAK-3, then fly ash and cement are loaded, and the mix is mixed for 2-3 min. to produce homogeneous mix with required cone slump, at the following ratio of components, wt %: portland cement 20.00, haydite 41.50, superplasticiser LSTM 0.0312, fly ash of TPP 17.50, PAK-3 0.025, water - balance.
EFFECT: reduced process operations in production of haydite mix, increased frost resistance, heat insulation properties and reduced average density of haydite without strength reduction.
SUBSTANCE: method to manufacture construction products from foam concrete includes preparation of a foam concrete mix from portland cement, fractionated quartz sand, a foaming agent and water in a turbulent mixer, loading of the produced mix into moulds from dielectric material, on the side surfaces of which there are metal electrodes, exposure of the foam concrete mix to the AC electric field of specified frequency and intensity. Processing of the freshly moulded products with electric field is carried out at the field intensity of 1.5-4.5 V/cm for 0.5-5 min. Efficiency of foam concrete mix exposure to the AC electric field depends on grain-size composition of quartz sand and is maximum when sand fractions of 0.16-0.315 mm are used.
EFFECT: improvement of strength characteristics of foam concrete.
3 cl, 6 tbl
SUBSTANCE: method for obtaining a heat-insulating material involves mixing of filler and a binding agent with further shaping and hardening. Industrial wood chips 5±2 mm thick are used as filler, and rigid polyurethane foam consisting of polyol and isocyanate is used as the binding agent. First, components of the binding agent are mixed; then, the binding agent is mixed with the filler by layer-by-layer laying of a binding agent layer, a filler layer and a binding agent layer into a mould at the following component ratio, wt %: polyol 24-22, isocyanate 36-33, industrial chips 40-45. After supply of the components is completed, the mould is fixed with latches and exposed during 15-20 minutes.
EFFECT: reduction of density and thermal conductivity of material.
1 tbl, 1 dwg
FIELD: process engineering.
SUBSTANCE: invention relates to production of foam materials on the basis of asbestos, basalt, carbon, polyether or polyamide or any other inorganic and organic fibres to be used in aircraft and ship building, machine building, etc. This method comprises the steps that follow. Production of foam bilk from initial mix of fibres and feed of said foam bulk to conveyor belt. Foam bulk is dried in drying chambers at stepwise increase in temperature in successive zones. Foam bulk is annealed in the kiln to foam material and cut reset-size boards. Note here that drying and annealing comprises simultaneous effects of IR radiation and convective heat. Note here that drying stepwise temperature increase occurs at 60°C-170°C. Annealing is performed at 190-280°C. Foam bulk is fed through drying chambers and annealing kiln at the rate of 6-12 m/h. Invention proposes also the conveyor line to this end.
EFFECT: accelerated drying, higher quality of foam material, continuous production.
8 cl, 3 dwg
SUBSTANCE: invention relates to preparation of construction mixtures, primarily fine-grained concrete mixtures and mortars which harden in natural conditions or under steam curing. Disclosed is a two-step method of preparing a construction mixture using mineral filler, a plasticising additive, sand and binder. The first step comprises mixing the binder - portland cement M500 D20, mineral filler - silicon carbonate gaize, 55-65% sand and 60-70% hardening water to obtain a homogeneous mixture, and the second step comprises adding to the obtained mixture the remaining sand, plasticising additive - superplasticiser SP-1 and the remaining water, and finally mixing to obtain a homogeneous mixture of given workability.
EFFECT: reducing consumption of expensive materials without reducing strength of the obtained material.
SUBSTANCE: method comprises electrochemical treatment of mains water in three-chamber electrolysis unit with ion-selective membranes by alternating asymmetric current. Meanwhile the electrolysis unit anode is made from shungite. During the electrochemical treatment of water in the anode and in the anode chamber the ultrasonic oscillations are exited, the frequency of which exceeds the cavitation threshold frequency within a range from 20 kHz up to 100 kHz, and the intensity of the named ultrasonics is in the field of stable cavitation from 1.5 W/cm2 up to 2,5 W/cm2. Water treatment is stopped at achieving of density of particles of hydrated fullerene 10-3-10-4%.
EFFECT: improvement of frost resistance of concrete mix, increase of cement hydratation level and strength of cement stone in early periods of curing.
SUBSTANCE: method of activation of concrete mixing water by its modifying with carbon fulleroid nano-particles with its consecutive ultrasonic processing comprises the placement of shungite into a vessel with water, the mass of shungite amount no less than 1% of water mass, and ultrasonic oscillations are excited in water with the frequency in the range from 20 kHz to 100 kHz, from 1.5 W/cm2 up to 2.5 W / cm2, and 10-3-10-5% and water and shungite are subjected to named ultrasonic oscillations within 5-10 minutes until achieving of density of fullerene, emanated from shungite into activated water, then the activated water is passed through the filter and is used as a concrete mixing liquid, and the shungite bottoms are left in the vessel, which is filled with the next portion of water and the procedure of concrete mixing liquid activation is repeated.
EFFECT: improvement of physic-mechanical characteristics of concrete, decrease of water consumption or cement consumption without affecting the concrete strength.
1 ex, 1 tbl
SUBSTANCE: invention relates to methods of activating hardening water of cement-based composites. The method of activating hardening water of cement-based composites includes treating tap water in a plasmatron with low-temperature nonequilibrium plasma in a period of time ranging from 1·10-2 s to 5·10-2 s.
EFFECT: high efficiency and degree of activation of water in order to speed up hydration and strength gain in the early stage of concrete hardening.
FIELD: process engineering.
SUBSTANCE: invention relates to production of inorganic heat-resistant rustproof composites in production of plastics, antirust and lubing materials for construction, electrical engineering, etc. Proposed method comprises mixing of inorganic natural material, liquid glass, dolomite powder and additive, mix forming and thermal treatment. Used is liquid sodium glass, its density making 1.28-1.42 kg/m3, as inorganic natural material, that is, montmorillonite modified by organic substance. Said additive represents a hydrated cellulose fibre shaped to 5.0-20.0 mm long staple impregnated with 30%-aqueous solution of iron, zinc, copper and aluminium sulphates taken in the ratio of 1.0:0.5:0.5:1.0 in flushing bath for 70-80 minutes. Then, said fibre is squeezed to moisture content of 60-65% and dried at 120-140°C to remove 95-98% of residual moisture. Components are mixed by mechanical activation for 8-10 minutes, mix being formed and annealed at temperature increase from 140°C to 1300°C for 30-40 minutes. Note here that montmorillonite is modified by the product of interaction between caprolactam or its oligomers with butyl stearate. Mix contains components in the following ratio in wt %: modified montmorillonite - 20-60, liquid glass - 20-30, dolomite - 10-35, cellulose fibre - 10-15. This invention is developed in dependent clauses.
EFFECT: higher fire resistance, lower heat conductivity factor, antirust properties.
3 cl, 3 ex, 1 tbl
SUBSTANCE: proposed insulating material comprises clay, calcitic material, oil sludge, and drill cuttings with the following component content, parts by weight: clay 1.0; calcitic material 0.5-5.0; drill cuttings 0.5-3.0; oil sludge 0.5-7.0.
EFFECT: reduction of consumption of natural clays, reduction of wastes of production in construction of motor roads and solid domestic waste landfills, improves the quality of final product.
3 cl, 1 dwg, 8 tbl
SUBSTANCE: method for producing the concrete aggregate includes preparation of mass based on low-melting clays, capable to swell under conditions of heat treatment, its hydration up to 17-23%, formation of granules, melting into the surface of moulded granules of the crushed cement clinker sieved through mesh No. 5, drying, calcining at a temperature of 1100°C, cooling.
EFFECT: increase of the bond strength of aggregate with cement stone.
SUBSTANCE: in this method to produce a dry anti-frost complex additive, including mixing of a plasticising component, a salt component and an intensifier of anti-frost action, the intensifier of anti-frost action is a water-soluble organic component not containing salt-producing functional groups, with the HLB value of 2.8-4.3, which is dried on a carrier - the plasticising component, and the produced powdered product is mixed with the dry salt component to produce the following content of components, wt %: plasticising component - 10-80, salt component - 10-75, intensifier of anti-frost action - 5-15. In the version of the method to produce a dry anti-frost complex additive, including mixing of a plasticising component, a salt component and an intensifier of anti-frost action, the intensifier of anti-frost action is a water-soluble organic component not containing salt-producing functional groups, with the HLB value of 2.8-4.3, which is mixed with the dry plasticising component, and the produced paste-like mass is mixed with the dry salt component to produce loose mass. The invention also relates to composition of the dry anti-frost complex additive produced by above methods.
EFFECT: lower doses of complex anti-frost additives due to increase of their technical efficiency and narrower range of recommended doses for entire temperature range of their application with provision of convenience of their transportation and storage.
7 cl, 2 tbl, 10 ex
SUBSTANCE: invention relates to construction and can be used for construction of an earth bed and a device of reinforced road bases on roads of categories I-V in road climatic zones II-V, as well as pavements on roads of categories IV-V as material for construction of earth bed fills and reinforcement of soil bases of construction and other sites. Improved road-building soil is characterised by the fact that it is obtained from a mixture containing the following, wt %: cement 5-15, waste of thermal utilisation of oil slurries - ash and slag with density of 1.2 to 1.6 kg/dm3 30-40, mineral filler 0-30, peat sorbent 2-4, drilling slurry with density of 1.3 to 1.8 kg/dm3 is the rest.
EFFECT: reduction of consumption of cement and fillers; utilisation of wastes.
7 dwg, 7 ex
SUBSTANCE: previously prepared samples with various quantity of a filler in a highly dispersed condition for a dry construction mix are placed into a hollow part of metal washers, placed on a metal plate, are compacted by any available method under permanent load of up to 5 MPa per 1 cm2 of sample surface for 10-15 seconds, then marks are applied on the surface of each sample in the form of drops of a solution of various concentration, wetting angles of samples are measured θ, a curve of dependence is built cosθ-1=f(1/σl), where σl - surface tension of the liquid, they determine the angle of inclination of this functional dependence a for each sample of different composition, the curve of dependence a is built on quantity of mix components, and by the point of break of the curve of dependence they define the optimal content of a modifier in the tested object.
EFFECT: reduced number of tests and higher accuracy of mixture composition selection.
2 cl, 2 dwg, 1 tbl
SUBSTANCE: nanocomposite material contains, wt %: mineral binder 83.7-83.9, mineral filler 2.1-2.3, fraction of carbon nanoparticles 0.00002, distilled water 13.79998-14.19998.
EFFECT: improvement of material characteristics, providing protection from neutron radiation flows, provision of technological mobility of working mixture in the process of pouring construction elements.
SUBSTANCE: decorative facing material includes, wt %: ground sheet glass 75.0-77.0; ground tuff 8.0-10.0; borax 10.0-13.0; ground talc 3.0-4.0. Frost resistance of the material makes at least 25 cycles. Components are dosed in required quantities. Sheet glass (broken glass) previously ground to powdered condition is mixed with borax and tuff and talc ground to powder condition. The produced mass is laid into detachable metal moulds, compacted and sintered at 800-870°C.
EFFECT: increased frost resistance of produced material.
SUBSTANCE: raw material mixture for obtaining artificial rock contains, wt %: Portland cement 26-30; quartz sand 47.3-55.85; water 16-20; fibrous metalloceramics 2.0-2.5; technical lignosulfonate LST 0.15-0.2.
EFFECT: increased strength.
SUBSTANCE: charge for obtaining a decorative-facing material includes, wt %: milled glass 50.0-55.0; milled tuff 20.0-25.0; liquid glass 10.0-15.0; clay 10.0-15.0.
EFFECT: increased frost resistance of the materials.
SUBSTANCE: invention relates to preparations used for increasing water resistance of concrete, namely to elaboration of novel concrete-colmating (imperforating concrete pores) composition. In basic version composition represents mixture of salts, formed by metals from the group: sodium, potassium, calcium, aluminium, and acids from the group: nitric, formic, sulfuric, carbonic, with the following ion ratio (ion weight in composition, g)/(100 g of composition): sodium 5.6-32, calcium 0.4-17.2, potassium 1.5-27.2, aluminium 0.5-7.6, nitrate 4.1-62.1, formiate 0.6-29.7, sulfate 10.3-54.7, carbonate 1.1-29.7, as well as complex-forming additives (such as, for instance, carbamide, nitryltriacetic acid, imino-N,N-diacetic-N-methylene phosphonic acid; glycin-N,N-di(methylene phosphonic) acid, iminodi(methylene phosphonic) acid; diaminopropanol- N,N,N',N'-tetraacetic acid; 2-hydroxypropylene diamine- N,N,N',N'-tetra(methylene phosphonic) acid; 2,3-dihydrobutylene-1,4-diamine- N,N,N',N'-tetra(methylene phosphonic) acid; 2,3-dihydroxybutylene-1,4-diamine- N,N,N',N'-tetraacetic acid; nitryl-tri(methylene phosphonic) acid; 1-hydroxyethylene diphosphonic acid; ethylenediamin- N,N,N',N'- tetra(methylene phosphonic) acid; ethylenediamine-N,N,N',N'- tetraacetic acid; in amount not more than 20% of colmating composition weight.
EFFECT: extension of arsenal of preparations, used to increase concrete water resistance.
5 cl, 3 tbl
SUBSTANCE: complex admixture for concrete mix contains Giperlit hyperplasticising agent and Taunit carbon nanostructured material (CNM) at the following component ratio, wt %: Giperlit hyperplasticising agent - 99.5-99.7, Taunit carbon nanostructured material - 0.3-0.5. A preparation method of the proposed complex admixture consists in ultrasonic dispergation of Taunit carbon nanostructured material in Giperlit hyperplasticising agent during 3-7 minutes by means of UZG13-0.1/22 ultrasonic generator.
EFFECT: increasing growth rate of strength of concretes at early hardening stage at preservation of their high final strength; increasing freeze resistance and water non-permeability.
2 cl, 1 tbl