CN112851227A

CN112851227A - Concrete formula and preparation process

Info

Publication number: CN112851227A
Application number: CN201911097303.9A
Authority: CN
Inventors: 王永和; 施培东; 张敏
Original assignee: Nanjing Jiushangding New Material Technology Co ltd
Current assignee: Nanjing Jiushangding New Material Technology Co ltd
Priority date: 2019-11-12
Filing date: 2019-11-12
Publication date: 2021-05-28

Abstract

The invention discloses a concrete formula and a preparation process, wherein the concrete comprises the following components in parts by weight: 20-35% of cement, 10-25% of fly ash, 5-15% of slag, 10-25% of straw powder, 2-6% of thickening agent, 6-10% of lightweight aggregate, 3-8% of expanding agent and 1-4% of water reducing agent: 20-35% of water. The concrete has excellent concrete working performance, reflects the development direction of environment-friendly concrete, has excellent performances of light weight, high strength and the like, has environmental protection advantages, can absorb and consume industrial and agricultural wastes in a large amount, has environmental protection significance, can improve the later strength of the concrete by adding the expanding agent, properly prolongs the setting time of the concrete, has excellent high crack resistance and seepage resistance, and has good adaptability, the added thickening agent solution molecules can be connected into a net structure, the solvent and other dispersion media are all contained in the net structure, the whole system forms semisolid without fluidity, and the viscosity of the concrete can be improved.

Description

Concrete formula and preparation process

Technical Field

The invention relates to the field of concrete production, in particular to a concrete formula and a preparation process.

Background

Concrete is a general term for engineering composite materials formed by cementing aggregate into a whole by cementing materials, and generally, concrete is formed by using cement as the cementing materials and sand and stone as the aggregate; the cement concrete, also called as common concrete, is obtained by mixing with water (which may contain additives and admixtures) according to a certain proportion and stirring, and is widely applied to civil engineering.

The concrete has the characteristics of rich raw materials, low price and simple production process, so that the consumption of the concrete is increased, and meanwhile, the concrete also has the characteristics of high compressive strength, good durability, wide strength grade range and the like, so that the application range of the concrete is very wide, the concrete is not only used in various civil engineering, but also is an important material in shipbuilding industry, mechanical industry, ocean development, geothermal engineering and the like, and the concrete is also an important material

The existing concrete has insufficient viscosity, so that a building collapse phenomenon occurs, most straws are subjected to incineration treatment, the environment is polluted, energy waste is caused, in addition, slag piling needs to occupy a large amount of land, the environment is adversely affected, light aggregate powder is directly mixed and stirred with various materials in the aspect of a preparation process, and the light aggregate is not easily mixed with other materials uniformly due to easy caking, so that a concrete formula and a preparation process are provided.

Disclosure of Invention

The invention aims to provide a concrete formula and a preparation process, and solves the problems that the concrete viscosity is not enough, the environment is polluted, energy is wasted, and lightweight aggregate is not easy to be uniformly mixed with other materials.

In order to achieve the purpose, the invention is realized by the following technical scheme:

the invention provides a concrete formula and a preparation process, wherein the concrete comprises the following components in parts by weight: 20-35% of cement, 10-25% of fly ash, 5-15% of slag, 10-25% of straw powder, 2-6% of thickening agent, 6-10% of lightweight aggregate, 3-8% of expanding agent and 1-4% of water reducing agent: 20-35% of water.

Preferably, the concrete comprises the following components in parts by weight: 25% of cement, 15% of fly ash, 5% of furnace slag, 15% of straw powder, 2% of thickening agent, 6% of lightweight aggregate, 3% of expanding agent, 1% of water reducing agent and 28% of water.

Preferably, the concrete comprises the following components in parts by weight: 30% of cement, 10% of fly ash, 10% of slag, 10% of straw powder, 3% of thickening agent, 8% of lightweight aggregate, 5% of expanding agent, 2% of water reducing agent and 22% of water.

Preferably, the concrete comprises the following components in parts by weight: 31% of cement, 8% of fly ash, 6% of slag, 11% of straw powder, 4% of thickening agent, 8% of lightweight aggregate, 5% of expanding agent, 3% of water reducing agent and 24% of water.

Preferably, the cement is prepared by using limestone, clay and silicon dioxide as main raw materials, crushing, blending and grinding the main raw materials to prepare raw materials, feeding the raw materials into a cement kiln to calcine the raw materials into clinker, and adding a proper amount of gypsum to grind the clinker.

Preferably, the slag is a melt floating on the surface of a liquid material such as metal generated in a pyrometallurgical process, mainly comprises silicon dioxide, aluminum oxide, calcium oxide and magnesium oxide, contains sulfides and carries a small amount of metal.

Preferably, the straw powder is obtained by drying and grinding stems and leaves of mature crops, the thickening agent is obtained by uniformly dispersing a cellulose monomer in water by virtue of an emulsifier under the mechanical stirring of the cellulose monomer to form an emulsion, and then adding an initiator to initiate the polymerization of the monomer.

Preferably, the expanding agent is prepared by mixing calcium sulphoaluminate, magnesium oxide, a plasticizing water reducing agent, mineral ultrafine powder, sodium tripolyphosphate, a water-retaining material and sodium gluconate, wherein the water reducing agent is prepared by neutralizing sulfite waste liquid with an alkaline solution, removing saccharides through biological fermentation, and evaporating and drying the materials into powder.

The invention also provides a preparation method of the concrete formula and the preparation process, which comprises the following steps:

(1) preparing according to the components and weight components: the adhesive comprises an acrylate emulsion binder, a water-based polyurethane acrylate binder, isopropanol, a neutralizer, a thickening agent, collagen, calcium carbonate and deionized water;

(2) adding the acrylate emulsion binder, the waterborne polyurethane acrylate binder, the isopropanol and the collagen into the deionized water, stirring by a high-speed stirrer until the mixture is heated and fully dissolved to obtain mixed liquid;

(3) and adding the neutralizer, the thickening agent and calcium carbonate into the mixed liquid, fully stirring and uniformly dispersing to obtain the concrete.

The fly ash is fine ash captured from flue gas generated after coal combustion, the main solid waste fly ash discharged by a coal-fired power plant is fly ash, the appearance of the fly ash is similar to that of cement, the color of the fly ash is changed from milky white to gray black, the fly ash particles are porous honeycomb structures, the specific surface area of the fly ash particles is large, the adsorption activity is high, and the particle size range of the particles is 0.5-300 mu m. And the bead wall has a porous structure, the porosity is as high as 50-80%, and the water absorption is strong.

The light aggregate has the features of coarse porous surface, high water absorption, etc. and is compounded with light coarse aggregate, light fine aggregate or common fine aggregate, cement, water, additive and admixture, and has apparent density not higher than 1950kg/m 3.

The invention has the beneficial effects that: the concrete added with the slag and the straw powder has excellent working performance, can be better combined with building industrialization, reflects the development direction of environment-friendly and light concrete, has excellent performances of heat insulation, sound insulation, fire resistance, light weight, high strength and the like, has environmental protection advantages, can absorb and consume industrial and agricultural wastes in large quantity, has environmental protection significance, can improve the later strength of the concrete, properly prolongs the setting time of the concrete, has excellent high crack resistance and seepage resistance, has good adaptability, can be connected into a net structure by added thickening agent solution molecules, and can improve the viscosity of the concrete because a solvent and other dispersion media are all contained in the net structure, so that the whole system forms a semisolid without fluidity.

Detailed Description

The following further describes embodiments of the present invention with reference to examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

Example 1

The preparation method comprises the following specific steps:

(1) preparing according to the components and weight components: 25% of cement, 15% of fly ash, 5% of furnace slag, 15% of straw powder, 2% of thickening agent, 6% of lightweight aggregate, 3% of expanding agent, 1% of water reducing agent and 28% of water;

(2) adding the lightweight aggregate into water, fully stirring the water to ensure that no block-shaped lightweight aggregate exists in the water, and adding cement, fly ash, furnace slag, straw powder and an expanding agent into a stirrer to be uniformly mixed;

(3) and (3) introducing the water added with the lightweight aggregate into a stirrer for mixing and pressurizing and tamping, adding a thickening agent and a water reducing agent into the mixed liquid, and fully stirring and uniformly dispersing to obtain the concrete.

Example 2

The preparation method comprises the following specific steps:

(1) preparing according to the components and weight components: 30% of cement, 10% of fly ash, 10% of slag, 10% of straw powder, 3% of thickening agent, 8% of lightweight aggregate, 5% of expanding agent, 2% of water reducing agent and 22% of water;

Example 3

The preparation method comprises the following specific steps:

(1) preparing according to the components and weight components: 31% of cement, 8% of fly ash, 6% of slag, 11% of straw powder, 4% of thickening agent, 8% of lightweight aggregate, 5% of expanding agent, 3% of water reducing agent and 24% of water;

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims

1. The concrete formula and the preparation process are characterized in that the concrete comprises the following components in parts by weight: 20-35% of cement, 10-25% of fly ash, 5-15% of slag, 10-25% of straw powder, 2-6% of thickening agent, 6-10% of lightweight aggregate, 3-8% of expanding agent and 1-4% of water reducing agent: 20-35% of water.

2. The concrete formulation and preparation process of claim 1, wherein the concrete comprises the following components by weight: 25% of cement, 15% of fly ash, 5% of furnace slag, 15% of straw powder, 2% of thickening agent, 6% of lightweight aggregate, 3% of expanding agent, 1% of water reducing agent and 28% of water.

3. The concrete formulation and preparation process of claim 1, wherein the concrete comprises the following components by weight: 30% of cement, 10% of fly ash, 10% of slag, 10% of straw powder, 3% of thickening agent, 8% of lightweight aggregate, 5% of expanding agent, 2% of water reducing agent and 22% of water.

4. The concrete formulation and preparation process of claim 1, wherein the concrete comprises the following components by weight: 31% of cement, 8% of fly ash, 6% of slag, 11% of straw powder, 4% of thickening agent, 8% of lightweight aggregate, 5% of expanding agent, 3% of water reducing agent and 24% of water.

5. The concrete formulation and process of claim 1 wherein the cement is prepared from limestone, clay and silica as main raw materials by crushing, blending, grinding to obtain raw material, feeding into a cement kiln to calcine to obtain clinker, adding appropriate amount of gypsum, and grinding.

6. The concrete formulation and process of claim 1, wherein the slag is a melt floating on the surface of a liquid material such as metal, formed in a pyrometallurgical process, and mainly comprises silica, alumina, calcium oxide, and magnesium oxide, and contains sulfides with a small amount of metal.

7. The concrete formula and the preparation process as claimed in claim 1, wherein the straw powder is prepared by sun-drying and grinding stems and leaves of mature crops, the thickening agent is prepared by dispersing a cellulose monomer in water uniformly by means of an emulsifier under mechanical stirring to form an emulsion, and then adding an initiator to initiate the polymerization of the monomer.

8. The concrete formulation and preparation process of claim 1, wherein the expansive agent is prepared by mixing calcium sulphoaluminate, magnesium oxide, plasticizing water reducing agent, mineral ultra-fine powder, sodium tripolyphosphate, water-retaining material, and sodium gluconate, and the water reducing agent is prepared by neutralizing sulfite waste liquor with alkaline solution, removing saccharides by biological fermentation, evaporating and drying into powder.

9. A method for preparing a concrete formulation and a preparation process, characterized in that the concrete according to any one of claims 1-8 is used, and the method comprises the following steps:

(1) preparing according to the components and weight components: cement, fly ash, slag, straw powder, a thickening agent, a lightweight aggregate, an expanding agent, a water reducing agent and water;