CN111548072A

CN111548072A - High-strength high-performance concrete and preparation method thereof

Info

Publication number: CN111548072A
Application number: CN202010480995.1A
Authority: CN
Inventors: 闫志伟
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-05-30
Filing date: 2020-05-30
Publication date: 2020-08-18

Abstract

The invention discloses a high-strength high-performance concrete and a preparation method thereof; relates to the technical field of concrete preparation, and comprises the following components: coarse sand, cement, fine sand, fly ash, silanization modified zeolite powder, water and an additive, wherein the preparation method comprises the following steps: (1) weighing raw materials; 2) adding cement, fine sand and fly ash into a stirrer for stirring, then sequentially adding coarse sand, continuing stirring, then adding fly ash, and then stirring to obtain a mixture; (3) adding water into the mixture, continuously stirring, adding water, stirring, adding silanized zeolite powder, continuously stirring, finally adding an additive, and stirring for 1 hour to obtain the high-strength high-performance concrete; the concrete prepared by the method has excellent strength, can better adapt to the external environment, has good stability, and the fly ash is a high-quality concrete admixture, so that the use amount of cement can be effectively reduced, and the cost is reduced.

Description

High-strength high-performance concrete and preparation method thereof

Technical Field

The invention belongs to the technical field of concrete preparation, and particularly relates to high-strength high-performance concrete and a preparation method thereof.

Background

Concrete is a general term for engineering composite materials in which aggregates are cemented into a whole by cementitious materials. The term concrete generally refers to cement concrete which is obtained by using cement as a cementing material and gravel and fine sand as aggregate, mixing the cement concrete with water according to a certain proportion, and adding an additive and an admixture into the mixture and stirring the mixture, and is also called ordinary concrete; the concrete has the characteristics of rich raw materials, low price and simple production process, so that the consumption of the concrete is increased more and more. Meanwhile, the concrete also has the characteristics of high compressive strength, good durability, wide strength grade range and the like. These characteristics make it very widely used, not only in various civil engineering, that is shipbuilding, machinery industry, ocean development, geothermal engineering, etc., but also concrete is an important material.

The invention discloses coal ash-based concrete in the prior art of application No. 201810707412.7, which comprises, by mass, 300 parts of artificial coal ash coarse aggregate 200-152, 50-150 parts of artificial coal ash fine aggregate, 5-20 parts of silica fume, 100 parts of geopolymer cement, 0.5-3 parts of a water reducing agent, 20-40 parts of water and 5-15 parts of an additive. The fly ash-based concrete prepared by the invention can reduce the volume weight of the concrete while ensuring the strength of the concrete, and has excellent thermal stability and chemical stability. The fly ash is used as a matrix material, so that the fly ash can be fully recycled, the problem of environmental pollution caused by the fly ash is solved, the consumption of cement is reduced by adding the fly ash to the existing concrete, and the production cost of the concrete is further reduced, but the slump of the concrete is reduced to a certain extent by directly adding a large amount of fly ash to the concrete, so that the stability of the concrete is reduced.

Disclosure of Invention

The invention aims to provide high-strength and high-performance concrete and a preparation method thereof, and aims to solve the problem that the stability of the concrete is reduced to a certain extent due to the fact that a large amount of fly ash is directly added into the concrete in the prior art.

The technical scheme adopted by the invention is as follows:

a high-strength high-performance concrete: the composition is prepared from the following components in parts by weight: 780-860 parts of coarse sand, 160-220 parts of cement, 930 parts of fine sand, 44-50 parts of fly ash, 350-390 parts of silanized modified zeolite powder, 200-250 parts of water and 22-25 parts of admixture;

the weight part ratio of the additive to the fly ash is 1: 2;

the fly ash is subjected to alkaline treatment.

Preferably, the fly ash is subjected to alkaline treatment, specifically:

uniformly mixing fly ash and glycerol according to a mass ratio of 10:1, grinding for 30min, drying to constant weight, adding the ground fly ash into an alkali liquor, heating to 80 ℃, stirring at a rotating speed of 500r/min for 1 hour, filtering, and drying to constant weight to obtain the product;

wherein the mixing ratio of the alkali liquor to the fly ash is 400 mL: 220g of the total weight of the powder.

Preferably, the alkali liquor is a mixed solution of sodium hydroxide and sodium bicarbonate, wherein the mass ratio of the sodium hydroxide to the sodium bicarbonate is 2:1, and the mass fraction of the sodium hydroxide is 5.6%.

Preferably: the preparation method of the silanization modified zeolite powder comprises the following steps:

heating zeolite powder to 460 ℃, carrying out heat preservation treatment for 30min, then grinding for 1 hour, then carrying out water cooling to room temperature, drying to constant weight, then adding the dried zeolite powder into an ethanol solution with the mass fraction of 35%, stirring uniformly, then adding a silane coupling agent into the ethanol solution, adjusting the temperature to 58 ℃, carrying out stirring reaction for 2 hours, then carrying out filtration, washing and drying to constant weight, thus obtaining the catalyst.

Preferably, the zeolite powder has an average particle size of 10 μm.

Preferably, the mixing mass ratio of the silane coupling agent to the zeolite powder is 1: 20.

Preferably, the additive is a water reducing agent;

wherein the water reducing agent is a naphthalene sulfonate water reducing agent.

The preparation method of the high-strength high-performance concrete comprises the following steps:

(1) weighing the raw materials according to the weight parts of the components in the claim 1;

(2) adding cement, fine sand and fly ash into a stirrer, stirring for 30min, then sequentially adding coarse sand, continuing stirring for 10min, then adding fly ash, and then stirring for 40min to obtain a mixture;

(3) adding water into the mixture, continuously stirring, adding water after stirring for 30min, adding silanized zeolite powder, continuously stirring for 10min, finally adding the additive, and stirring for 1 h to obtain the concrete.

Preferably, the stirring rate is 800 r/min.

The cement is used as a basic raw material for manufacturing the concrete, the cement is used for cementing broken stones to prepare the concrete, and the concrete prepared by the synergistic action of the components has higher strength after being hardened and can resist the erosion of saline water, so that the stability of infrastructure facilities can be better maintained.

Has the advantages that: according to the high-strength high-performance concrete and the preparation method thereof, the high-performance concrete prepared by the method has excellent strength, can better adapt to the external environment, and is good in stability, the fly ash is a high-quality concrete admixture, the using amount of cement can be effectively reduced, and the cost is reduced, however, the slump of the concrete can be reduced to a certain extent by directly adding a large amount of fly ash into the concrete, so that the stability of the concrete is reduced, therefore, the compatibility of the fly ash is improved by treating the fly ash, and the high slump of the concrete can be kept after the fly ash is added in a large amount; according to the invention, the silanized zeolite powder is added into the concrete, so that the workability between the zeolite powder and other components of the concrete is improved, the pumpability of the concrete is greatly enhanced, the creep of the concrete is reduced, the hydration heat and the thermal expansion are reduced, the anti-permeability capability of the concrete is improved, and the modification property of the concrete is increased; the water is added to blend components in the concrete to be uniformly distributed, so that the stability of the concrete is enhanced, but the stability of the concrete is reduced due to the addition of excessive water, so that a certain amount of water reducing agent needs to be added, and the water reducing agent has a dispersing effect on cement particles, so that the workability of the concrete can be improved, the unit water consumption is reduced, and the fluidity of a concrete mixture is improved; or the unit cement consumption is reduced, and the cement is saved.

Detailed Description

In order to make the technical solutions of the present application better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

A high-strength high-performance concrete: the composition is prepared from the following components in parts by weight: 780-860 parts of coarse sand, 160-220 parts of cement, 930 parts of fine sand, 44-50 parts of fly ash, 350-390 parts of silanized modified zeolite powder, 200-250 parts of water and 22-25 parts of admixture; the addition of the fine sand can improve the compactness and the hardened strength of the concrete;

the weight part ratio of the additive to the fly ash is 1: 2;

the fly ash is subjected to alkaline treatment, a large amount of fly ash is directly added into the concrete, the slump of the concrete is reduced to a certain extent, and the stability of the concrete is reduced, so that the compatibility of the fly ash is improved by treating the fly ash, and the high slump of the concrete can be maintained after the fly ash is added in a large amount.

The fly ash is subjected to alkaline treatment, and specifically comprises the following steps:

The alkali liquor is a mixed solution of sodium hydroxide and sodium bicarbonate, wherein the mass ratio of the sodium hydroxide to the sodium bicarbonate is 2:1, and the mass fraction of the sodium hydroxide is 5.6%.

The preparation method of the silanization modified zeolite powder comprises the following steps:

The average particle size of the zeolite powder is 10 mu m.

The mixing mass ratio of the silane coupling agent to the zeolite powder is 1: 20.

The additive is a water reducing agent;

The following will clearly and completely describe the technical solutions of the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

A high-strength high-performance concrete: the composition is prepared from the following components in parts by weight: 780 parts of coarse sand, 160 parts of cement, 815 parts of fine sand, 44 parts of fly ash, 350 parts of silanization modified zeolite powder, 200 parts of water and 22 parts of additive;

the weight part ratio of the additive to the fly ash is 1: 2; the fly ash is subjected to alkaline treatment.

The zeolite powder has an average particle size of 10 μm. The mixing mass ratio of the silane coupling agent to the zeolite powder is 1: 20. The additive is a water reducing agent; wherein the water reducing agent is a naphthalene sulfonate water reducing agent.

Example 2

A high-strength high-performance concrete: the composition is prepared from the following components in parts by weight: 860 parts of coarse sand, 220 parts of cement, 930 parts of fine sand, 50 parts of fly ash, 390 parts of silanized modified zeolite powder, 250 parts of water and 25 parts of additive;

Example 3

A high-strength high-performance concrete: the composition is prepared from the following components in parts by weight: 810 parts of coarse sand, 180 parts of cement, 886 parts of fine sand, 46 parts of fly ash, 370 parts of silanized modified zeolite powder, 250 parts of water and 23 parts of an additive;

Test of

Carrying out performance detection on concrete of the embodiment;

Δ slump = initial slump-slump after one hour

TABLE 1

	△ slump/mm	Extension/mm
			Example 1	10	660/640
Example 2	10	650/640
			Example 3	10	640/630

From table 1, it can be seen that the concrete prepared by the invention has better compactness, smaller slump, better expansibility and higher strength.

Concrete strength detection

The concrete strength of the examples and the comparative examples is detected:

TABLE 2

	7d Strength/MPa	28d Strength/MPa
			Example 1	45.2	53.0
Example 2	46.9	54.1
			Example 3	46.2	53.4
Control group	35.2	46.8

Control group: a high performance concrete, application No. 201711185357.1;

as shown in Table 2, the high-performance concrete prepared by the method has excellent strength, can better adapt to the external environment and has good stability.

In conclusion, the compatibility of the fly ash is improved by treating the fly ash, so that the high slump of concrete can be kept after the fly ash is added in a large amount; according to the invention, the silanized zeolite powder is added into the concrete, so that the workability between the zeolite powder and other components of the concrete is improved, the pumpability of the concrete is greatly enhanced, the creep of the concrete is reduced, the hydration heat and the thermal expansion are reduced, the anti-permeability capability of the concrete is improved, and the modification property of the concrete is increased; the water reducing agent has a dispersing effect on cement particles, so that the workability of the cement can be improved, the unit water consumption is reduced, and the fluidity of concrete mixtures is improved; or the unit cement consumption is reduced, and the cement is saved.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention, and the present invention is not limited to the illustrated embodiments, but rather should be construed in the spirit and scope of the present invention as defined by the appended claims.

Claims

1. The high-strength high-performance concrete is characterized in that: the composition is prepared from the following components in parts by weight: 780-860 parts of coarse sand, 160-220 parts of cement, 930 parts of fine sand, 44-50 parts of fly ash, 350-390 parts of silanized modified zeolite powder, 200-250 parts of water and 22-25 parts of admixture;

the weight part ratio of the additive to the fly ash is 1: 2;

the fly ash is subjected to alkaline treatment.

2. A high strength high performance concrete according to claim 1, wherein: the fly ash is subjected to alkaline treatment, and specifically comprises the following steps:

3. A high strength high performance concrete according to claim 2, wherein: the alkali liquor is a mixed solution of sodium hydroxide and sodium bicarbonate, wherein the mass ratio of the sodium hydroxide to the sodium bicarbonate is 2:1, and the mass fraction of the sodium hydroxide is 5.6%.

4. A high strength high performance concrete according to claim 1, wherein: the preparation method of the silanization modified zeolite powder comprises the following steps:

5. The high-strength high-performance concrete according to claim 4, wherein: the average particle size of the zeolite powder is 10 mu m.

6. The high-strength high-performance concrete according to claim 4, wherein: the mixing mass ratio of the silane coupling agent to the zeolite powder is 1: 20.

7. A high strength high performance concrete according to claim 1, wherein: the additive is a water reducing agent;

8. The method for preparing the high-strength high-performance concrete according to claim 1, wherein the method comprises the following steps: the method comprises the following steps:

9. The method for preparing the high-strength high-performance concrete according to claim 8, wherein the method comprises the following steps: the stirring speed is 800 r/min.