JPS63236746A - Mixture for manufacturing chemically resistant concrete - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to structural materials, and in particular to chemically resistant concrete mixes having water glass as a basic component. Concrete is used in the construction of buildings and processing structures under highly corrosive liquid and gaseous medium conditions in ferrous and non-ferrous metallurgical plants, chemical plants.

[Prior Art and Problems] Water glass, finely divided quartz sand used in the production of mortars, putties and mastics for corrosion-resistant coatings.

Mixes containing hardeners such as perlite and fluorosilicates are known in the art. These coatings have a structure of low thermodynamic stability and therefore have high moisture absorption, low water resistance and limited resistance in corrosive media.

The curing agents used in these mixes are highly toxic, which creates problems in their manufacture.

A mix for the production of acid-resistant concrete containing water glass, perlite with a grain size of less than 0.14 mm and from 0.14 to 5 cm, and andesite rough stone in the following proportions is known (USSR Inventor's Certificate No. 306093).

fnt, c13C04B 19104).

-Water glass (p=1, 34 g/cm') 15~
25 Perlite 10-20 with a grain size of 0.14 mm or less Perlite 15-25 with a grain size of 5 III m or more Remainder Concrete produced from this mix is 28.0- 29
．． It has a compressive strength of OMPa and a bending strength of 9.6-11.0 MPa. The resistance of this concrete, measured by mass change when boiling in 40% sulfuric acid for 1.5 hours, is 96.3-97.2%.

In addition to high acid resistance, this concrete has a high pore structure, low mechanical strength and low water resistance.

Also known in the art are mixes for producing silicic concrete having the following composition in weight percent (USSR Inventor's Certificate No. 513955, fnt.

C1l C04B 19104).

- Aggregate 40-55 - Specific area 2.
This mix contains finely divided quartz sand, which forms the active part of the slag-glass binder, and therefore the concrete produced from it has a 80-80- 100. At the same time, concrete produced from this mix has a high acid permeability.

Also known is a mix for the production of chemically resistant concrete having the following composition in weight percent (Soviet inventor's certificate, No. 8
No. 82965, Int, Cl5C04B19104
).

monohydric glass 12-13 - Finely divided aggregate 33-34 - Acid-alkali resistant aggregate 1) Residual concrete produced from this mix is.

It has a low level of durability in the combined action of mechanical loads and corrosive media, high acid permeability and water absorption, and low water resistance.

[Object of the Invention] The present invention aims to: 1 select the amount and quality of modifying components that give concrete a high level of durability under the combined action of mechanical loads and erosive media, low acid permeability and high water resistance; The objective is to provide an improved mix for the production of chemically resistant concrete.

[Summary of the Invention] According to the invention, this interlayer comprises, in a mix for the production of chemically resistant concrete, comprising water glass, pulverulent acid moisture-containing volcanic glass, and alkali-acid resistant aggregate.
The solution is to provide a mix containing silicon dioxide in crystalline form and/or kaolinite in muddy structure and/or melaminocyanurate as modified materials in the following weight percentages:

Monohydrate glass 8 to 18 - Volcanic glass containing fine powder acidic moisture 30 to 40 - Modifier: silicon dioxide in crystalline form 1 to 6 and/or kaolinite in pellite structure 1 to 5 and/or melaminocyanurate 0. 2 to 1.0 - Acid-alkali resistant aggregate Residue The physico-mechanical properties of the chemically resistant concrete obtained can be improved by incorporating in the mix any one of the above-mentioned modifiers or mixtures thereof. It provides a significant improvement and increases the efficiency of its application to building and processing structures used under high mechanical loads in corrosive media. That is, this concrete is a known one (Soviet inventor's certificate, No. 88296).
(See No. 5) has the following advantages.

- 25-45% improvement in durability level under the combined action of mechanical loads and corrosive media; - 60-6% increase in acid permeability;
4% decrease.

- 28-30% decrease in water absorption; - 10-15% increase in water resistance.

In order to reduce the acid permeability of the chemically resistant concrete and give it a high elastic modulus as well as a high level of durability against the action of acids under dry conditions, the mix preferably has the following weight % composition: Water glass 12 to 15 - Volcanic glass containing fine powder acidic moisture - Obsidian 35 to 40 - Silicon dioxide in crystalline form 1 to 6 - Acid-alkali resistant aggregate
To ensure a high durability level of chemical resistance concrete in residual water, the mix should contain the following weight percentages:
It is preferable to have the following composition.

monohydric glass 8 to 12 - volcanic glass containing fine powder acidic moisture - pearlite 30 to 35 - 'R' tank structure kaolinite 1 to 5 - acid-alkali resistant aggregates residues of various types (acidic, neutral ,alkalinity)
In order to use chemically resistant concrete in corrosive media, it is preferred that the mix has the following weight percent composition:

Glass monohydrate 15-8°-Pearlite 32-34-Silicon dioxide in crystalline form 2-4-Kaolinite in muddy structure 2
~4-Acid-Alkali Resistant Aggregate Residue The best moisture absorption properties and water resistance of the chemically resistant concrete according to the invention are achieved by introducing 0.4-0.6% by weight of melaminocyanurate into the mix composition. guaranteed by doing.

[Effects of the present invention] The mix according to the present invention for producing chemically resistant concrete having the above formulation is produced as follows.

A mix consisting of dry ingredients is produced by mixing together acid-alkali resistant aggregates, finely divided acidic moisture-containing volcanic glass, and modifiers such as crystalline silicon dioxide and/or sea-structured kaolinite. Manufacture. The dry mix is combined and mixed with water glass and a modifier - melamino cyanurate until a homogeneous mix is formed for the production of chemically resistant concrete.

The quantitative selection of components is determined by the desired physico-mechanical properties of the chemically resistant concrete to be produced.

or a mixture of various combinations thereof.

The mix prepared in this way is charged into a mold, tamped, and heated under a pressure of 0.6 to 1.2 MPa.
Add hydrothermal treatment for 10 hours.

As acid-alkali resistant aggregates 1. Quartz sand and rough stones of granite, quartzite, *edge and andesite origin can be used.

Excellent effects can be obtained by using pearlite, obsidian, and pyrophoric porphyry as the finely powdered acidic water-containing volcanic glass.

- silicon dioxide in crystalline form 1 to 6 - kaolinite in muddy structure 1 to 5 - melamino cyanurate 0.2 to 1.0 If the above amount of silicon dioxide is contained in the mix formulation, hardened concrete The content in the mix of less than 1% by weight of silicon dioxide helps in the formation of a feldspar-type textural structure in the concrete, which in addition to feldspar also forms mordenite, which helps to form a feldspar-type textural structure in concrete. This results in a decrease in time durability.

Introducing more than 6% by weight of silicon dioxide into the mix is not effective as it acts as an inert aggregate without changing the structure of the concrete.

In the waterglass-pearlite (obsidian, corrugated porphyry) system, large amounts of free alkali are present in addition to feldspar-type water-resistant minerals.

Kaolinite, which has a muddy structure and is introduced at 1 to 5% in the mix, reacts with this alkali to form water-soluble aluminosilicate, which, if present in concrete, improves the long-term durability of concrete in water and in alkali. Helps improve your sexual level.

The effect of melaminocyanurate on concrete structures is determined by its water-accumulating action.

Although it exhibits high water absorption and limited water resistance, amounts above 1% by weight do not further improve the physico-chemical properties of concrete.

the modulus of elasticity of concrete produced from said mix,
The compressive strength and tensile strength were also measured using the following standard test method.

The resistivity of concrete according to the invention is determined as the ratio of the final compressive strength of a sample after boiling for 36 hours in the corresponding medium to the final compressive strength of a similar sample stored in air-dry conditions.

The long-term durability level of concrete in a corresponding corrosive medium indicates the ability of the concrete to withstand loads over a long period of time.

The long-term durability level of concrete is determined for all its compositions by the following method.

The durability of concrete samples is determined until they break during pressing (for example R = 100 MPa).

Here R is the final strength) measured when the load is increased over a short period of time. In that case, the sample should be compressed to a load close to the final load, e.g. σ=0.95R1 or R=95
M P a, where σ is the stress in the concrete during compression), record the time from the moment of sample loading to its failure. Next, load the new sample with σ = 0.9OR.

It is reduced so that σ=0.85R and σ=0.8OR. At that time, the survival time of the concrete under load is recorded for each load level. Using the data obtained in this way, a curve is plotted in the coordinate system "load level vs. load level" indicating the survival time of concrete under each load. From the resulting plot, it is possible to determine for each sample, by extrapolation, the load level to failure that the sample can withstand for a desired period of time. The obtained load level is the long-term durability level of the concrete.

In determining the long-term durability level of concrete in corrosive media, concrete samples were previously boiled for 36 hours and allowed to remain in the appropriate corrosive medium until final saturation. The retention of concrete samples under load is also
As mentioned above, it was carried out under the continuous action of a corrosive medium.

Examples In the following, examples are given which illustrate the method of producing chemically resistant concrete from mixes of various compositions according to the invention.

Example 1 A mix was prepared from the dry ingredients by mixing 920 g of obsidian, 460 g of quartz sand, 506 g of granite rubble, and 138 g of silicon dioxide in crystalline form. The resulting mix was mixed with 276 ml of water glass.

This mix for the production of chemically resistant concrete has the following weight percent composition:

Isui glass 12- Obsidian
40-Silicon dioxide in crystalline form 6-Granite rough stone
22-Quartz sand 2
Physical-chemical tests were carried out on 0 cubic samples of concrete and the results are shown in the table below.

Example 2 805 kg of obsidian, 575 kg of quartz sand, 552
A mix was prepared from the dry ingredients by mixing kg of granite rough stone and 23 kg of silicon dioxide in crystalline form. The above mix was heated at 345k until a thoroughly mixed homogeneity was obtained.
g of water glass.

The chemically resistant concrete production mix thus obtained has the following weight % composition:

-Water glass 15-Obsidian
35-Silicon dioxide in crystalline form 1-Granite rough stone
24-Quartz sand 25 This mix was charged into a mold and subjected to hydrothermal treatment at a pressure of 0.8 MPa for 6 hours.

Physical-chemical tests were carried out on the cubic sample-shaped concrete thus obtained, and the results shown in the table below were obtained.

Example 3 805 kg of perlite, 506 kg of quartz sand, 6
A mix was prepared from the dry ingredients by mixing 90 kg of silica coarse stone and 115 kg of kaolinite with a mud-like structure. Stir this mix for 18 minutes until a completely homogeneous mix is obtained.
Mix with 4 kg of water glass.

The chemically resistant concrete mix produced in this way has the following weight percent composition:

-Water glass 8-Pearlite 35-Kaolinite with mud-like structure 5-Silicate rough stone
30 - Quartz sand 22 This mix was charged into a mold and subjected to hydrothermal treatment under a pressure p of 0.9 MPa for 10 hours.

A physical-chemical test was conducted on the obtained cubic sample of concrete, and the results are shown in the table below.

Example 4 Pearlite of 690°, 575 kg of quartz sand, 7
A mix was prepared from the dry ingredients by mixing 36 kg of silica coarse stone and 23 kg of kaolinite with a mud-like structure. The mix thus obtained was mixed with 276 kg of water glass until a completely homogeneous mix was obtained.

The chemically resistant concrete mix thus obtained has the following weight % composition:

-Water glass 12-Barlite 30-Muddy structure kaolinite 1-Silicite rough stone 3
2-Quartz sand 25 This mix was charged into a mold and subjected to hydrothermal treatment under a pressure of 0.8 MPa for 8 hours.

A physical-chemical test was conducted on the obtained cubic sample of concrete, and the results are shown in the table below.

Example 5 782 kg of perlite, 460 kg of quartz sand, 5
A mix was prepared from the dry ingredients by blending 29 kg of diabase rough stone, 92 kg of crystalline silicon dioxide, and 92 kg of mud-like kaolinite. The resulting mix was mixed with 345 kg of water glass until a completely homogeneous mixture was obtained.

The resulting chemically resistant concrete mix has the following weight percent composition:

Glass monohydrate 15- Barite 34- Silicon dioxide with crystalline structure 4- Kaolinite with mud-like structure
4- Diabase rough stone 23- Quartz sand
20 This mix was charged into a mold and subjected to hydrothermal treatment under a pressure of 1.0 MPa for 6 hours.

A physical-chemical test was conducted on the obtained cubic sample of concrete, and the results are shown in the table below.

Example 6 736 kg of perlite, 460 kg of quartz sand, 5
A mix was prepared from the dry ingredients by blending diabase 98, silicon dioxide with a -46 crystal structure, and 46 kg of mud-like kaolinite. The resulting mix was mixed with 414 ml of water glass until a completely homogeneous mixture was obtained.

The resulting chemically resistant concrete mix has the following weight percent composition:

Glass monohydrate 18-Pearlite 32-Silicon dioxide with crystalline structure 52-Kaolinite with mud-like structure 2
- Diabase rough stone 26 - Quartz sand
20 This mix was charged into a mold and subjected to hydrothermal treatment under a pressure of 1.2 MPa for 6 hours.

A physical-chemical test was conducted on the obtained cubic sample of concrete, and the results are shown in the table below.

Example 7゜ 920kg of perlite and 414kff of quartz sand.

A mix was prepared from the dry ingredients by blending with 754 kg of granite rubble. The resulting mix was mixed with 184 kg of water glass and 23 kg of melaminocyanurate until a completely homogeneous mixture was obtained.

The resulting chemically resistant concrete mix has the following weight percent composition:

One water glass 8-perlite 4゜-melaminocyanurate
1-Granite rough stone 3
3-Quartz sand □8 This mix was charged into a mold and subjected to hydrothermal treatment for 8 hours under a pressure of 0.8 MPa.6 Physical-chemical tests were conducted on the resulting concrete in the form of cubic samples. The results are shown in the table below.

Example 8゜ 690 kg of perlite and 621 kg of quartz sand.

A mix was prepared from the dry ingredients by blending with 570.4 kg of granite rubble. The resulting mix was mixed with 414 ml of water glass and 4.6 ml of melaminocyanurate;
Mix until a completely homogeneous mixture is obtained. The resulting chemically resistant concrete mix has the following weight percent composition:

-Water glass E8-Perlite 3゜-Melaminocyanurate
0.2-Granite rough stone
24.8-Quartz Sand 27 This mix was charged into a mold and hydrothermally treated under a pressure of 0.6 MPa for 10 hours.

Physical-chemical tests were carried out on the obtained cube-shaped concrete, and the results are shown in the table below.

Example 9゜ 920kg of obsidian and 469.2kg of quartz sand.

A mix was prepared from the dry ingredients by blending 621 kg of diabase rock and 92 kg of crystalline silicon dioxide. The resulting mix was mixed with 184 kg of water glass and 13.8 kg of melaminocyanurate until a completely homogeneous mixture was obtained.

The chemically resistant concrete mix thus obtained has the following weight percent stratification:

-Water glass 8-Obsidian
4゜-Crystalline silicon dioxide 4-melaminocyanurate
0.6 - Diabase rough stone 27 - Quartz sand 20.4 This mix was charged into a mold cavity and hydrothermally treated under a pressure of 0.7 MPa for 9 hours.

A physical-chemical test was conducted on the obtained cubic sample of concrete, and the results are shown in the table below.

Example 10 690 kg of obsidian, 529 kg of quartz sand, 558
．． A mix was prepared from the dry ingredients by blending 8 kg of diabase rough stone with 46 kg of silicon dioxide of crystal structure. The resulting mix was mixed with 414 ml of water glass and 9.2 ml of melaminocyanurate until a completely homogeneous mixture was obtained.

The chemically resistant concrete mix thus obtained has the following weight % composition:

-Water glass 18-Obsidian
3゜-crystalline silicon dioxide 2-melaminocyanurate
0.4-diabase rough stone 25.6
-Quartz sand 23Pour this mix into a mold and place it under a pressure of 0.9MPa for 7
Hydrothermally treated for hours.

A physical-chemical test was conducted on the obtained cubic sample of concrete, and the results are shown in the table below.

Example 11゜ 920kg of perlite and 414kg of quartz sand.

A mix was prepared from the dry ingredients by blending silica masonry at 584.2, silicon dioxide with a crystalline structure at 92, and kaolinite at a muddy structure at 92. The prepared mix is mixed with 184 kg of water glass and 13.8 kg of melaminocyanurate until a completely homogeneous mixture is obtained.

The chemically resistant concrete mix thus obtained has the following weight % composition:

-Water glass 8-Pearlite 4゜-Crystalline silicon dioxide 4-Melaminocyanurate
0.6-Kaolinite with muddy structure 4-Silicite rough stone 25.4-Quartz sand
18 This mix was charged into a mold and subjected to hydrothermal treatment under a pressure of 1.0 MPa for 7 hours.

A physical-chemical test was conducted on the obtained cubic sample of concrete, and the results are shown in the table below.

Example 12 690 kg of pearlite, 478.4 quartz sand, 616.4 silica masonry, 46 crystal structure silicon dioxide, 46 muddy structure kaoli A mix was prepared from the dry ingredients by blending with night. 414 of the mix thus produced, with 414 of water glass and 9.2 of melaminocyanurate;
Mix until a completely homogeneous mixture is obtained.

The chemically resistant concrete mix thus obtained has the following weight % composition:

-Water glass 18-Pearlite 30-Crystalline silicon dioxide 2-Melaminocyanurate
0.4-Kaolinite with mud-like structure 2-Silicite rough stone 26.8-Quartz sand
20.8 This mix was placed in a mold and subjected to hydrothermal treatment under a pressure of 0.8 MPa for 8 hours.

A physical-chemical test was conducted on the obtained cubic sample of concrete, and the results are shown in the table below.

[Effects of the invention] The concrete produced by the mix of the invention has the following characteristics in comparison with the conventional concrete according to USSR Inventor's Certificate No. 882,965.

- 25-45% increase in long-term durability level in the combined action of mechanical loads and corrosive media.

- 60-64% reduction in acid permeability.

- 28-30% reduction in water absorption.

- 10-15% increase in water resistance.

@Inventor Igor, Fuyodo Sobirowitsch, Rudenko Leva

Claims (1)

[Claims] 1. Water glass, volcanic glass containing finely powdered acidic water,
In mixes for the production of chemically resistant concrete containing alkali-acid resistant aggregates, silicon dioxide in crystalline form and/or kaolinite in muddy structure,
and/or melaminocyanurate in the following weight % ratio. - Water glass 8 to 18 - Volcanic glass containing fine powder acidic water 30 to 40 - Modifier: crystalline silicon dioxide 1 to 6 and/or muddy structure kaolinite 1 to 5 and/or melamino cyanurate 0 .2 to 1.0-Acid-alkali resistant aggregate Remaining amount 2, containing obsidian as finely powdered acidic moisture-containing volcanic glass, and having the following weight % composition according to claim 1 mix. - Water glass 12 to 15 - Obsidian 35 to 40 - Crystalline silicon dioxide 1 to 6 - Acid-alkali resistant aggregate Remaining part 3, containing pearlite as finely powdered acidic water-containing volcanic glass, with the following weight % composition: Mix in particular according to claim 1, characterized in that it has: - Water glass 8 to 12 - Pearlite 30 to 35 - Kaolinite with muddy structure 1 to 5 - Acid-alkali resistant aggregate Remaining part 4, having the following weight % composition: Mix according to item 1. - water glass 15 to 18 - pearlite 32 to 34 - silicon dioxide in crystalline form 2 to 4 - kaolinite in muddy structure 2 to 4 - acid-alkali resistant aggregate Remaining part 5, 0.4 to 0. Mix according to any of claims 2 or 3 or 4, characterized in that it contains melaminocyanurate in an amount of 6% by weight.