RU2093490C1 - Method of preparing binder, concrete of mortar mix - Google Patents

Abstract

FIELD: building industry, more particularly preparation of mortars with modifying additives. SUBSTANCE: claimed method of preparing binder, concrete or dissolved mortar mix comprises introducing hydrolyzed polyacrylonitrile additive in the form of aqueous 0.5-1.5 concentration solution during grinding operation or additive during mixing with mineral components of concrete or soluble mortar in the form of aqueous 0-0.1 % concentration solution, the amount of additive constituting 0.001-0.003 % by dry matter based on the amount of cement. Saponified polyacrylonitrile includes partially saponified polyacrylinitrites. Plasticity of concrete mix with one of said additives is not greater than 5 cm, and strength of concrete after 28 days is 29.5 MPa. EFFECT: more efficient preparation method. 1 tbl

Description

 The invention relates to methods for preparing building mixtures.

 A known method of preparing a building mixture, which consists in the fact that in the process of preparing the mixture, a nitrogen-containing additive is introduced into it, including, by weight. sodium nitrate 80 90.91 and polyethylene polyamine 9.09 20.

 Closest to the claimed is a method of preparing a concrete mixture, which consists in the fact that in the process of mixing cement, gravel, sand and water, an additive of water-soluble nitron fiber production waste is added, an aqueous solution of polyacrylonitrile hydrolysis product / K-9 / worked out by caustic sodium, where n = 240 in the following ratio of components, wt.

Cement 16-21
Crushed stone 49-58
The specified production waste of 0.2-0.56
Sand 16-25
Water The rest.

Задача предложенного решения направлена на то, чтобы обеспечить пластичность, удобоукладываемость, повышенную прочность и экономию цемента, бетона, раствора с добавками гидролизованных полиакрилонитрилов, что позволяет получать структуры бетонов и растворов с оптимальными содержаниями щебня, гравия, песка и цемента при обеспечении наилучших свойств.The specified product has the following structural formula:

The objective of the proposed solution is to ensure plasticity, workability, increased strength and economy of cement, concrete, mortar with the addition of hydrolyzed polyacrylonitriles, which allows to obtain structures of concrete and mortar with optimal gravel, gravel, sand and cement contents while ensuring the best properties.

где n 5000-7000 c омыленным полиакрилонитрилом формулы

где n=1000-5000 в соотношении 1:1 и вводят добавку в количестве 0,001-0,003% от массы цемента на сухое вещество, причем в вяжущее при помоле цемента вводят в виде водного раствора 0,5-1,5%-ной концентрации, а при приготовлении бетонной или растворной смеси в процессе перемешивания компонентов в виде водного раствора 0,1%-ной концентрации в воде затворения.This is achieved by the fact that in the method for preparing a cement-based cementitious, concrete or mortar mixture, which includes the preliminary preparation of an aqueous solution of an alkaline good hydrolysis product of polyacrylonitrile with sodium hydroxide and mixing it with mineral components, a product selected from the group: saponified polyacrylonitrile preparation is used as an additive "Uniflock" with a molecular weight of 100,000-150000 cu saponified polyacrylonitrile preparation "K-9" with a molecular weight of 45000-100000 cu a mixture of saponified polyacrylonitrile of the formula:

where n 5000-7000 with saponified polyacrylonitrile of the formula

where n = 1000-5000 in a ratio of 1: 1 and an additive is added in an amount of 0.001-0.003% by weight of cement to dry matter, and 0.5-1.5% concentration of an aqueous solution is introduced into the binder when grinding cement, and when preparing a concrete or mortar mixture in the process of mixing the components in the form of an aqueous solution of 0.1% concentration in the mixing water.

 The compositions of binders with additives, their properties, as well as the properties of concrete obtained on their basis, are presented in the table.

Examples 1 (control) and 2. Portland cement clinker 7600 g (95 wt.) And gypsum stone 400 g (5 wt.) Are poured into the ball mill chamber together. The same masses of Portland cement clinker and gypsum stone are poured into another ball mill chamber and 32 ml of a 0.5% aqueous solution of the K-9 preparation are uniformly poured onto the clinker based on the dry matter content of K-9 0.16 g, i.e. 0.002% of the mass of cement. Then produce a joint grinding of both compounds for 60 minutes After grinding, the unloading of cement from both chambers is carried out separately in separate aluminum flasks with tightly closed lids. Ground cement samples are separately sieved through a No. 02 sieve with a 0.14 mesh, separating large particles. Sifted cements are tested according to the methods of GOST 310.1.3-76 and GOST 310.4-81 to determine the physicomechanical properties of the control composition of cement N 1 without additives, K-9 preparation and the claimed composition N 2 with K-9 preparation. The test results are presented in the table. Physico-mechanical properties are determined on samples-beams with a size of 4 x 4 x 16 cm, made of a cement-sand mortar mixture with a composition of 1: 3 / cement: sand /. Concrete mixtures of the composition 1: 2.4: 3.8: 0.5 / cement: sand: crushed stone: water / are made of the remaining cements, stone gravel of a fraction of 5-20 mm, sand and water, from which 10-cubic samples are formed 10 x 10 cm, having previously determined the mobility of both concrete mixtures / settlement of the OK cone in cm / using the Abrams cone. In total, 6 cubes are formed from each concrete mix, two of them are steamed according to the 2 + 3 + 6 + 2 h mode, and four cubes are kept in a normal storage cabinet for a day, and then placed in a bath with water at a temperature of 20 ± 2 ^o C. The first two cubes are tested for compressive strength after steaming, the second pair of cubes after 7 days of normal storage, the third pair after 28 days of normal storage. The test results of concrete mixtures are presented in the table.

 Examples 3 and 4. For the next joint grinding take Portland cement clinker 6000 g / 75 wt. /, electrothermophosphoric slag 1000 g / 20 wt. /, gypsum stone 400 g / 5 wt. /, 0.5% aqueous solution of the drug K-9 32 ml / 0.16 g per dry substance or 0.002 wt. /. The composition is poured into the ball mill chamber. Control example 4 of a similar composition of 6000 g of clinker, 1600 g of slag and 400 g of gypsum stone is poured into the second chamber without the addition of K-9, and then both compounds are ground simultaneously for 60 minutes. Further tests of both compounds are carried out according to the described method. The results of physical and mechanical tests of cement paste, cement-sand mortars and concrete mixtures are presented in the table.

 Examples 5 and 10. Portland cement clinker 6000g / 75 wt. /, 1600 g of slag / 20 wt. /, 400 g of gypsum stone / 5 wt. / pour into the chamber of a ball mill, on a clinker 32 ml of a 0.5% aqueous solution of the Uniflock preparation are uniformly poured / at the rate of 0.16 g of dry matter or 0.002% /. The same composition of the cement mixture is loaded into the second chamber of the mill, but the aqueous solution of the Uniflock preparation is dosed in 2 times less, i.e. 16 ml or 0.001% of dry matter by weight of cement, designated N 10 / according to the numbering in the attached table /. Then, simultaneous grinding of both compositions of the mixture is performed for 60 minutes. Ground cement samples are tested according to the method described above.

 Examples 6 and 7. Portland cement clinker 6400 g / 80 wt. /, natural gliege / mineral supplement / 1200g / 15 wt. /, gypsum stone 400g / 4.99 wt. / Pour together into the ball mill chamber and evenly pour 48 ml of an aqueous 0.5% solution of the "partially saponified saponified polyacrylonitrile" preparation onto the charge / at the rate of 0.24 g or 0.003% dry matter by weight of cement /. An example is indicated by N 6 in the attached table. In the second chamber load the same control composition of the charge without a solution of the drug "partially saponified polyacrylonitrile", which is indicated by N 7 in the table. Then produce simultaneous grinding of both compositions for 60 minutes, unload them separately and test according to the method described above in example No. 1. Physico-mechanical properties of cement paste, cement-sand mortar and cement concrete are listed in the attached table.

 Example 8 and 9. To determine the effect of additives of the preparation “partially saponified polyacrylonitrile”, introduced into cement, mortar and concrete mixtures not in cement, but separately with mixing water, identical compositions of the cement mixture, indicated in the attached table, are poured into both chambers of the ball mill under N 8, from Portland cement clinker 6000 g / 75 wt. /, gliezha 1600g / 20 wt. /, gypsum stone 400 g / 5 wt. /. The cement is ground for 60 minutes, the samples are unloaded separately and then tested according to the methods of GOST 310.1.3-76 and GOST 310.4-81, with the difference that when testing sample No. 9 in the mixing water of cement paste, cement-sand mortar and cement - concrete mixture add the calculated amount of an aqueous 0.5% solution of the drug "partially saponified polyacrylonitrile" taking into account the dosage of 0.002% dry matter by weight of cement. The results of physical and mechanical tests of control example No. 8 and the claimed example No. 9 are listed in the attached table.

Claims (1)

A method of preparing a cement-based cementitious, concrete or mortar mixture, comprising pre-preparing an aqueous solution of an alkaline hydrolysis product of a polyacrylonitrile alkaline hydrolysis product with sodium hydroxide and mixing it with mineral components, characterized in that the product selected from the group: saponified polyacrylonitrile preparation is used as an additive Uniflock "with a molecular weight of 100,000 to 150,000 cu saponified polyacrylonitrile preparation "K-9" with a molecular weight of 45,000 100,000 cu a mixture of saponified polyacrylonitrile of the formula

where n 5000 7000
with saponified polyacrylonitrile of the formula

where n 1000 5000,
in a ratio of 1 to 1 and the additive is introduced in an amount of 0.001 0.003% by weight of cement per dry substance, and the additive is introduced into the cement binder when grinding cement in the form of an aqueous solution of 0.5 1.5% concentration, and when preparing a concrete or mortar mixture, the process of mixing the components in the form of an aqueous solution of 0.1% concentration in the mixing water.

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