Method to prepare gypsum cement pozzolan binder

FIELD: construction.

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.

2 tbl

 

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.%:

Semi-aquatic gypsum57-57,7
Portland4,9-15,3
The specified surface-active substance1,3-1,8
Metakaolin2,7-3,3
Waterelse

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.%:

Semi-aquatic gypsum57-57,7
Portland Of 14.9 and 15.3
The specified surface-active substance1,3-1,8
Metakaolin2,7-3,3
Waterelse



 

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