RU2272008C1 - Building composition and powdered additive for building composition (lignopan) - Google Patents

Abstract

FIELD: manufacture of building materials.

SUBSTANCE: in a building composition including (kg/m3) mineral binder (250-600), aggregate (1050-1900), water (120-300), and powdered additive containing Lignopan B1 in amount 0.25-0.45% of the weight of mineral binder, said additive further contains sodium thiosulfate and/or aluminum thiosulfate in amounts 5-11% of the total weight of additive. Mineral binder is selected from Portland cement, Portland blast-furnace cement, lime-silica binder, and gypsum cement-pozzolana binder. Aggregate can be selected from quartz sand with fineness modulus 2.0-3.0 and broken stone fraction 5-400 mm or 5-20 mm mixed with above quartz sand at ratio 1.4:2.0. Building composition is intended for use when preparing concrete or mortar mixes in manufacture of concrete and reinforced concrete parts and units of prefabricated or in-situ construction as well as in construction, operation, and repair of wells.

EFFECT: enhanced waterproofness at reduced consumption of cement and prevented salt formation on parts and units manufactured from claimed composition.

7 cl, 2 tbl

Description

The invention relates to the building materials industry and can be used in the preparation of building, mainly concrete or mortar mixtures in the production of concrete and reinforced concrete products and the construction of precast and monolithic construction, as well as in the oil and gas industry in the construction, operation and repair of wells.

Known building mixture, including (kg / m ³ ): Portland cement 450, granite crushed stone 984, sand - 737, water 202 l and a comprehensive additive of 0.5-0.9% by weight of cement. The complex additive was obtained by drying a mixture containing an aqueous solution of technical lignosulfonates, sodium sulfate, an alkaline modifier - an alkali-containing mineral reagent and a 50% solution in white spirit of synthetic fatty acid production residues in a ratio of 1: (0.6-1.5): (0.05-0.15) :( 0.05-0.1) [1].

A well-known building composition, including (kg / m ³ ): Portland cement 430, sand 820, crushed stone 960, water 180 l and a powdered complex additive containing a mixture of an aqueous solution of technical lignosulfonates and an exhausted solution of desulfurization of coke oven gas plants based on sodium thiosulfate in the ratio (1-3) :( 5-10) per dry substance. [2].

The closest analogue to the building composition is a building composition comprising a mineral binder, aggregate, water and a powder additive Lignopan B1 with a ratio of components of the building composition, which is, kg / m ³ : mineral binder 300-500, aggregate 1250-1790, water 180- 210 and an additive of 0.2-0.7 wt.% By weight of the mineral binder [3].

The closest analogue to the claimed additive is a powdery additive for the building composition Lignopan B1 - dried in a fluidized bed at 78-82 ° C fraction with a molecular weight of 10 · 10 ³ -20 · 10 ³ isolated from a mixture containing, wt.%: Aqueous solution of technical lignosulfonates 95-97, alkaline protease with a pH of 9-12 - 5-3 [3].

The aim of the invention is to increase the water resistance of the building composition with reduced cement consumption, as well as the prevention of vysolobeniya on products and structures made from the specified building composition.

This goal is achieved by the fact that in the construction composition, including a mineral binder, aggregate, water and a powdered additive containing Lignopan B1, this additive additionally contains sodium thiosulfate and / or aluminum sulfate in the following ratio of its components, wt.%: Lignopan B1-89 -95, sodium thiosulfate and / or aluminum sulfate 5-11, with the ratio of the components of the building composition, kg / m ³ :

mineral binder 250-600 aggregate 1050-1900 water 120-300

moreover, the content of the specified additives is 0.25-0.45 wt.% by weight of the mineral binder.

As a mineral binder, the building composition may contain Portland cement or slag Portland cement, a lime-siliceous binder, gypsum cement-pozzolanic binder.

As a filler, the composition may contain quartz sand with a fineness modulus of Mkr 2.0-3.0 or crushed stone fractions of 5-40 mm or 5-20 mm and quartz sand with a fineness modulus of Mkr 2.0-3.0 in a ratio of 1.4 : 2.0.

This goal is also achieved by the fact that the powder additive for the building composition containing Lignopan B1, additionally contains sodium thiosulfate and / or aluminum sulfate in the following ratio, wt.%:

Lignopan B 1 89-95 sodium thiosulfate and / or aluminum sulfate 5-11

The invention is as follows.

Prepare the claimed additive.

To obtain the Lignopan B1 additive, an aqueous solution of technical lignosulfonate (LST) of 50% concentration is used, the enzyme preparation is an alkaline protease with a pH of 9-12. Technical lignosulfonates are mixed with an alkaline protease with a pH of 9-12, followed by isolation of fractions of 10 · 10 ³ -20 · 10 ³ using polymer membranes from the resulting mixture and drying in a fluidized bed at 78-82 ° C. Moreover, it is advisable to withstand the mixture before fractionation for 4 hours at 40-50 ° C. Next, Lignopan B1 and sodium thiosulfate and / or aluminum sulfate are mixed, in wt.%: Lignopan B1 89-95, sodium thiosulfate and / or aluminum sulfate 5-11.

For the preparation of a building composition — concrete and mortar — a mineral binder is used, for example, Portland cement, crushed stone fractions of 5–40 or 5–20 mm, sand with a micron density of 2.0, water and the specified additive in an amount of 0.22-0.45 wt.% from a mineral binder. The compositions of the additive, concrete and mortar mixture and physico-mechanical properties are given in table 1.2.

In the composition of 1, 3 is used as a binder Portland cement grade 500.

In the composition 2, 4 is used as a cement slag Portland cement grade 400.

In composition 5, a lime-silica binder is used as a binder. In compositions 1-2, crushed stone of a fraction of 5-20 mm, sand with Mkr 2 is used.

In compositions 4 and 5, crushed stone of a fraction of 5-40 mm and sand with MKR 3 are used.

Composition 3 uses sand with Micr 2.

Information sources

1. RU 2032641, publ. 1995.

2. RU 2001894, publ. 1994.

3. RU 2114082, publ. 1998.

Claims (7)

1. A construction composition comprising a mineral binder, aggregate, water and a powder additive containing Lignopan B1, characterized in that the additive further comprises sodium thiosulfate and / or aluminum sulfate in the following ratio of its components, wt.%: Lignopan B1-89- 95, sodium thiosulfate and / or aluminum sulfate-5-11, with the ratio of the components of the building composition, kg / m ³ : Mineral binder 250-600 Aggregate 1050-1900 Water 120-300 moreover, the content of the specified additives is 0.25-0.45 wt.% by weight of the mineral binder. 2. The composition according to claim 1, characterized in that as a mineral binder it contains Portland cement or slag Portland cement. 3. The composition according to claim 1, characterized in that as a mineral binder it contains a lime-silica binder. 4. The composition according to claim 1, characterized in that as a mineral binder it contains a gypsum cement-pozzolanic binder. 5. The composition according to claim 1, characterized in that it contains silica sand with a fineness modulus Mkr 2.0-3.0 as a filler. 6. The composition according to claim 1, characterized in that as a filler it contains crushed stone fractions of 5-40 mm or 5-20 mm and quartz sand with a fineness modulus Mkr 2.0-3.0 in a ratio of 1.4: 2, 0. 7. A powder additive for a building composition containing Lignopan B1, characterized in that it additionally contains sodium thiosulfate and / or aluminum sulfate in the following ratio of components, wt.%: Lignopan B1 89-95 Sodium thiosulfate and / or aluminum sulfate 5-11