Method to prepare gypsum cement pozzolan composition

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 aqueous solution of carboxylate polyester "Glenium Ace® 430", a controller of setting and hardening times "BEST-TB" and a homogeneous mix of oligoethoxysiloxanes "Ethyl silicate -40" at the ratio of 1:0.17:0.07, he pozzolan component is metakaolin with hydraulic activity of at least 1000 mg/g at the following ratio of components, wt %: calcined gypsum 56.7-57.4, portland cement 14.6-15.4, specified surfactant 1-1.8, metakaolin 2.7-3.3, water - balance.

EFFECT: increased frost resistance, longer times of composition 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 SW 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 is depending on cement type and gipsotsementnyj ratio may 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 min in the activator are added into the mixture of semi-aquatic gypsum and waste silica gel � mixing in the mixer (RU 2368580 C2, IPC SW 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 the finished composite, the increase of strength properties in bending and compression, frost resistance and water resistance of the hardened gipsotsementnyj-pozzolanic compositions based on low-grade semi-aquatic gypsum and Portland cement for General construction purposes M400, while simplifying the manufacturing technology.

The technical result of the invention is to increase frost resistance, lengthening the setting time of the composition, n�release her self-compacting ability, higher limits of strength in bending and compression, increased water resistance and reduced water absorption of the hardened gipsotsementnyj-pozzolanic composition.

The result is achieved in that in the method of producing gipsotsementnyj-pozzolan composition 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 for 2 min, as a surfactant, a mixture of an aqueous solution of polycarboxylate ether "Glenium ACE® 430", timing controller setting and hardening "BEST TB and a homogeneous mixture of oligoetoxichlorsiloxane "ethyl silicate-40" in the ratio of 1:0,17:0,07, as pozzolanic metakaolin component used with hydraulic activity is not less than 1000 mg/g in the following ratio of components, wt.%:

Semi-aquatic gypsum56,7-57,4
Portlandcement� 14,6-15,4
The specified surface-active substance1-1,8
Metakaolin2,7-3,3
Waterelse

The use of surfactants in the composition of the aqueous solution of polycarboxylate ether "Glenium ACE® 430" reduces water requirement of the composition and improves the strength characteristics of products, the application of the regulator setting and hardening "BEST TB increases the pot life of the finished composite, resulting in lengthening of the setting time. The combination of the aforementioned aqueous solution of polycarboxylate ether with the regulator setting and hardening gives gipsotsementnyj-pozzolanic composition of self-compacting ability. The use of surfactants in the composition homogeneous mixture of oligoetoxichlorsiloxane "ethyl silicate-40" 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-pozzolanic compositions used the following�e materials:

Semi-aquatic gypsum brand GB produced by "Arakchinsky gypsum" (GOST 125-79);

Portland cement PC 400 DON 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:

- the aqueous solution of polycarboxylate ether "Glenium ACE® 430" produced by "BASF Building systems";

- the regulator setting and hardening - BEST-TB", produced by 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%;

- the homogeneous mixture oligoetoxichlorsiloxane "ethyl silicate-40" manufactured by JSC "Khimprom", Novocheboksarsk (TU 2435-427-05763441-2004).

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-pozzolanic compositions churchyard 23789-79. To obtain the samples used surfactants of the following composition, wt.%: an aqueous solution of polycarboxylate ether "Glenium ACE® 430" - 81,1; the regulator setting and hardening "BEST-TB - 13,5; the homogeneous mixture oligoetoxichlorsiloxane "ethyl silicate-40" - 5,4.

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 at least 5,000 rpm for 1 min in the presence of a surfactant, and then the resulting mixture was added a semi-aquatic gypsum and metakaolin and produce further hydroactive in a rotary pulsation apparatus to obtain a homogeneous mixture for 2 min.

From gipsotsementnyj-pozzolanic compositions 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 specimens to modonesi�EN. For the criterion of self-compacting ability took the ability gipsotsementnyj-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 made of samples of the prototype on the basis of Portland cement for General construction purposes M400.

The compositions gipsotsementnyj-pozzolanic compositions shown in table 1, the results of mechanical tests of the samples are given in table 2.

The test results of the samples gipsotsementnyj-pozzolanic compositions 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 in the range of 56.7 57.4 per cent, Portland cement 14,6-15,4%, surfactant 1-1,8%, 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% is observed the 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 compositions increase slightly.

The product obtained according to the present invention, have high strength'hara�the performances, water resistance and frost resistance, low water absorption. The use of this surfactant allows to obtain self-compacting gipsotsementnyj-pozzolan composition and improve its viability.

In addition, the production gipsotsementnyj-pozzolanic compositions in a single unit, 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-pozzolan composition 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, 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 min, as a surfactant, a mixture of an aqueous solution of polycarboxylate ether "Glenium ACE® 430", the regulator setting and hardening "BEST TB and a homogeneous mixture of oligoetoxichlorsiloxane "ethyl silicate-40" in the ratio of 1:0,17:0,07, ka�ETS pozzolanic metakaolin component used with hydraulic activity is not less than 1000 mg/g in the following ratio of components, wt.%:

Semi-aquatic gypsum56,7-57,4
Portland14,6-15,4
The specified surface-active substance1-1,8
Metakaolin2,7-3,3
Waterelse



 

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