阅读说明：本技术 一种性能调节型矿物掺和料及其制备方法 (Performance-adjustable mineral admixture and preparation method thereof ) 是由 赵计辉 王栋民 王奕仁 于 2020-06-19 设计创作，主要内容包括：本发明公开了一种性能调节型矿物掺和料及其制备方法,此性能调节型矿物掺和料的组成包括和易性调节型、强度调节型、体积收缩调节型的一种或多种矿物掺和料；和易性调节型矿物掺和料的组分包括有粘聚性调节超细粉、流动性调节超细粉和化学外加剂；强度调节型矿物掺和料的组分包括有流动性调节超细粉、高活性超细粉和化学外加剂；体积收缩调节型矿物掺和料的组分包括有流动性调节超细粉、高硫高钙相超细粉和化学外加剂；各超细粉的颗粒粒径＜8μm,中值粒径D50＝3±1μm；化学外加剂为具有辅助调节功能固含量为25～45％的液体添加剂；此方案能够改善水泥混凝土的和易性、强度和体积收缩性能,满足混凝土不同性能要求的提升。(The invention discloses a performance-adjustable mineral admixture and a preparation method thereof, wherein the performance-adjustable mineral admixture comprises one or more mineral admixtures of a workability adjusting type, a strength adjusting type and a volume contraction adjusting type; the components of the workability adjusting type mineral admixture comprise cohesiveness adjusting superfine powder, fluidity adjusting superfine powder and chemical admixture; the components of the strength adjusting type mineral admixture comprise fluidity adjusting superfine powder, high activity superfine powder and chemical admixture; the volume contraction adjusting type mineral admixture comprises components of fluidity adjusting superfine powder, high-sulfur high-calcium phase superfine powder and chemical admixture; the particle size of each ultrafine powder is less than 8 mu m, and the median particle size D50 is 3 +/-1 mu m; the chemical additive is a liquid additive with the auxiliary adjusting function and the solid content of 25-45%; the scheme can improve the workability, the strength and the volume shrinkage performance of the cement concrete and meet the improvement of different performance requirements of the concrete.)

1. A performance-adjustable mineral admixture is characterized in that,

comprises one or more of a workability adjusting type mineral admixture, a strength adjusting type mineral admixture and a volume contraction adjusting type mineral admixture;

the components of the workability adjusting type mineral admixture comprise cohesiveness adjusting superfine powder, fluidity adjusting superfine powder and chemical admixture;

the components of the strength adjusting type mineral admixture comprise fluidity adjusting superfine powder, high-activity superfine powder and chemical admixture;

the components of the volume contraction adjusting type mineral admixture comprise fluidity adjusting superfine powder, high-sulfur high-calcium phase superfine powder and chemical admixture;

the particle size of the cohesiveness adjusting superfine powder, the fluidity adjusting superfine powder, the high-activity superfine powder and the high-sulfur calcium phase superfine powder is less than 8 mu m, and the median particle size D50 is 3 +/-1 mu m;

the chemical admixture is a liquid additive with the auxiliary adjusting function and the solid content of 25-45%.

2. The performance-regulated mineral admixture of claim 1, wherein said workability-regulated mineral admixture consists of 10 to 20% of said cohesiveness-regulating micropowder, 60 to 80% of said fluidity-regulating micropowder, and 0 to 0.3% of said chemical admixture.

3. The performance-adjusted mineral admixture of claim 1, wherein the strength-adjusted mineral admixture consists of 5 to 25% of the fluidity-adjusting micropowder, 70 to 80% of the high-activity micropowder, and 0 to 0.5% of the chemical admixture.

4. The performance-regulated mineral admixture of claim 1, wherein the volume shrinkage-regulated mineral admixture consists of 10 to 30% of the flowability-regulating micropowder, 60 to 80% of the high-sulfur high-calcium phase micropowder, and 0 to 0.2% of the chemical admixture.

5. The performance-regulated mineral admixture according to claim 1, wherein said cohesion regulation microfine powder is one or more selected from the group consisting of flue dust of a sorted ferrosilicon plant, flue dust of an industrial silicon plant, flue dust of a desiliconized zirconium plant.

6. The performance-modifying mineral blend of claim 1, wherein the flowability-modifying micropowder is one or more of finely ground sorted fly ash, fly ash microbeads, coal gasifier micropowder.

7. The performance-modifying mineral blend of claim 1, wherein the ultra-fine, high activity powder is one or both of ultra-fine blast furnace slag powder and ultra-fine metakaolin.

8. The performance-modifying mineral blend of claim 1, wherein the high-sulfur, high-calcium phase micropowder is one or both of a finely ground, classified ultrafine circulating fluidized bed fly ash and an ultrafine lithium slag powder.

9. The performance-adjusted mineral admixture according to claim 1, wherein the chemical admixture is composed of 0 to 5% of triethanolamine borate, 0 to 15% of calcium lignosulfonate, 5 to 10% of N-methyldiethanolamine, 0 to 8% of monoethanol diisopropanolamine, 0 to 10% of sodium acetate, 2 to 8% of molasses and 55 to 75% of water.

10. A preparation method of a performance-adjustable mineral admixture is characterized by comprising the following steps,

step S1, grinding or sorting corresponding ultrafine powder by using an ultrafine powder grinding process, wherein the particle size of the ultrafine powder is less than 8 mu m, the median particle size D50 is 3 +/-1 mu m, and the ultrafine powder comprises cohesiveness adjusting ultrafine powder, fluidity adjusting ultrafine powder, high-activity ultrafine powder and high-sulfur high-calcium phase ultrafine powder;

step S2, dissolving calcium lignocaine and sodium acetate in water according to the composition proportion, then sequentially adding triethanolamine borate, N-methyldiethanolamine, monoethanoldiisopropanolamine and molasses, and uniformly mixing to prepare a chemical additive, wherein the chemical additive is a liquid additive with an auxiliary adjusting function and a solid content of 25-45%;

step S3, uniformly mixing the ultra-fine powder and the chemical admixture of corresponding components according to the composition proportion of the workability adjustment type mineral admixture, the strength adjustment type mineral admixture and the volume contraction adjustment type mineral admixture, wherein the chemical admixture is sprayed on the surface of the ultra-fine powder in a spraying manner, and thus the corresponding different performance adjustment type mineral admixtures are prepared.

Technical Field

The invention relates to the field of concrete mineral admixtures, in particular to a performance-adjustable mineral admixture and a preparation method thereof.

Background

Cement concrete is the most used and widely used structural material in civil engineering and building engineering in the world, has become the material foundation for the development of human society, and the cement concrete material will be one of the most important building materials for human in the future. However, with the development of theoretical methods for modern civil engineering structure design and construction techniques, modern structural engineering is rapidly developing towards large-span, large-depth, long-distance and ultra-high-rise, which puts high performance requirements on the performance of concrete, including better workability or workability, higher strength and better durability.

At present, on one hand, the performance of concrete is improved by adopting a measure of optimizing a matching ratio and raw materials, for example, the strength of the concrete is improved by reducing a water-cement ratio, but the problem of poor workability of the concrete is also caused; on the other hand, the method of mixing mineral admixture is usually adopted, but at present, because of various types of industrial waste residues, easy fluctuation of components and different physical and chemical characteristics, the prepared mineral admixture often has great influence on the workability, strength or volume stability of concrete, and is difficult to meet the requirement of high performance of modern cement concrete. Therefore, a functional mineral admixture with high quality/high performance and even with an optimized improvement effect on the performance of cement concrete is urgently needed to meet the high performance requirement of modern cement concrete.

Starting from the mineral characteristics and physicochemical properties of the industrial waste residue, the corresponding functional mineral admixture is prepared by utilizing the advantages of the industrial waste residue and advanced processing technology and equipment, which is an important idea for improving the industrial waste residue as the mineral admixture, but the research and application work in the aspect is lack at present and is not fully developed.

Disclosure of Invention

The invention aims to provide a performance-adjustable mineral admixture and a preparation method thereof, and aims to solve the problem that the prior art is lack of functional mineral admixtures.

In order to solve the technical problems, the invention provides a performance-adjusting mineral admixture, which comprises one or more of a workability-adjusting mineral admixture, a strength-adjusting mineral admixture and a volume-shrinkage-adjusting mineral admixture; the components of the workability adjusting type mineral admixture comprise cohesiveness adjusting superfine powder, fluidity adjusting superfine powder and chemical admixture; the components of the strength adjusting type mineral admixture comprise fluidity adjusting superfine powder, high-activity superfine powder and chemical admixture; the components of the volume contraction adjusting type mineral admixture comprise fluidity adjusting superfine powder, high-sulfur high-calcium phase superfine powder and chemical admixture; the particle size of the cohesiveness adjusting superfine powder, the fluidity adjusting superfine powder, the high-activity superfine powder and the high-sulfur calcium phase superfine powder is less than 8 mu m, and the median particle size D50 is 3 +/-1 mu m; the chemical admixture is a liquid additive with the auxiliary adjusting function and the solid content of 25-45%.

In one embodiment, the workability-adjusting mineral admixture is composed of 10-20% of the cohesiveness-adjusting micropowder, 60-80% of the fluidity-adjusting micropowder and 0-0.3% of the chemical admixture.

In one embodiment, the strength-adjusted mineral admixture is composed of 5 to 25% of the fluidity-adjusting micropowder, 70 to 80% of the high-activity micropowder, and 0 to 0.5% of the chemical admixture.

In one embodiment, the volume contraction adjusting type mineral admixture is composed of 10-30% of the fluidity adjusting superfine powder, 60-80% of the high-sulfur high-calcium phase superfine powder and 0-0.2% of the chemical admixture.

In one embodiment, the cohesiveness adjusting superfine powder is one or more of sorted ferrosilicon plant flue dust, industrial silicon plant flue dust and desiliconized zirconium plant flue dust.

In one embodiment, the fluidity-adjusting micropowder is one or more of finely ground and sorted fly ash, fly ash microbeads, coal gasifier ultrafine ash.

In one embodiment, the high activity ultrafine powder is one or two of ultrafine blast furnace slag powder and ultrafine metakaolin.

In one embodiment, the high-sulfur high-calcium phase superfine powder is one or two of superfine circulating fluidized bed fly ash and superfine lithium slag powder which are ground and sorted.

In one embodiment, the chemical additive comprises 0-5% of triethanolamine borate, 0-15% of calcium lignosulphonate, 5-10% of N-methyldiethanolamine, 0-8% of monoethanol diisopropanolamine, 0-10% of sodium acetate, 2-8% of molasses and 55-75% of water.

In order to solve the technical problems, the invention also provides a preparation method of the performance-adjustable mineral admixture, which comprises the following steps,

step S1, grinding or sorting corresponding ultrafine powder by using an ultrafine powder grinding process, wherein the particle size of the ultrafine powder is less than 8 mu m, the median particle size D50 is 3 +/-1 mu m, and the ultrafine powder comprises cohesiveness adjusting ultrafine powder, fluidity adjusting ultrafine powder, high-activity ultrafine powder and high-sulfur high-calcium phase ultrafine powder;

step S2, dissolving calcium lignocaine and sodium acetate in water according to the composition proportion, then sequentially adding triethanolamine borate, N-methyldiethanolamine, monoethanoldiisopropanolamine and molasses, and uniformly mixing to prepare a chemical additive, wherein the chemical additive is a liquid additive with an auxiliary adjusting function and a solid content of 25-45%;

step S3, uniformly mixing the ultra-fine powder and the chemical admixture of corresponding components according to the composition proportion of the workability adjustment type mineral admixture, the strength adjustment type mineral admixture and the volume contraction adjustment type mineral admixture, wherein the chemical admixture is sprayed on the surface of the ultra-fine powder in a spraying manner, and thus the corresponding different performance adjustment type mineral admixtures are prepared.

The invention has the following beneficial effects:

1. the mineral admixture of the invention comprises various types such as workability adjusting type, strength adjusting type, volume shrinkage adjusting type and the like, not only fully utilizes industrial waste residues, but also effectively adjusts the workability or strength or volume stability of cement concrete, and overcomes the defect that the performance of the cement concrete is reduced or deteriorated when the traditional industrial waste residues are used as mineral admixtures.

2. The flue dust of ferrosilicon plants, the flue dust of industrial silicon plants and the flue dust of desiliconized zirconium plants are fully utilized to have the characteristics of amorphous state, hydrophobic and porous interior and fine particles, so that the problems of slurry adhesion, bleeding and the like of cement concrete can be effectively solved, and the cement concrete can be used as the cohesiveness regulating component; the ultrafine fly ash of the pulverized coal furnace, the fly ash microbeads and the ultrafine ash of the coal gasification furnace are mostly spherical or special in shape, have better morphological effect, micro-aggregate effect and the like, can effectively solve the problem of poor fluidity of cement concrete doped with solid waste admixture, and are used as the fluidity adjusting component of the invention. And furthermore, the two functional components are compounded to prepare the workability-adjustable mineral admixture, so that the synergistic superposition effect of the components can be fully exerted, the workability of the cement concrete is improved, and the prepared cement concrete has the characteristics of good cohesiveness and fluidity.

3. The invention fully utilizes the excellent activity effect and the micro-aggregate filling effect of the superfine blast furnace slag powder and the superfine metakaolin with the particle size of 0-8 mu m, and takes the superfine blast furnace slag powder and the superfine metakaolin as the components of the strength-adjustable mineral admixture, thereby effectively overcoming the influence of the common mineral admixture on the early strength of the cement concrete, improving the strength development of the cement concrete and optimizing the microstructure of the cement concrete.

4. The invention fully utilizes the characteristic that the superfine circulating fluidized bed fly ash and the superfine lithium slag powder contain more calcium sulfate phase, and carries out superfine grinding to destroy the hard shell structure of the calcium sulfate phase, so that the activity of the superfine circulating fluidized bed fly ash and the superfine lithium slag powder is improved, and the later generation delay of ettringite is avoided.

5. The triethanolamine borate, the N-methyldiethanolamine and the monoethanol diisopropanolamine in the additive have the functions of dispersing ultrafine powder and avoiding agglomeration, and also have the function of complexing calcium ions of a cementing material, so that the activity of a mineral admixture is particularly promoted to be improved; the calcium lignosulphonate has the effect of assisting in optimizing the workability of cement concrete, and the sodium acetate and molasses components have the effect of assisting in adjusting the hydration rate. The invention prepares the auxiliary admixture by compounding the different components, not only further promotes the performance of the performance-adjustable mineral admixture, but also improves the adaptability of the performance-adjustable mineral admixture to different cement concrete materials.

6. Compared with the existing mineral admixture, the invention belongs to a dual-purpose or multi-purpose admixture, not only can replace the cement dosage, but also can effectively improve the performance of cement concrete, and particularly can meet the requirements of modern high-strength and high-performance concrete, which is difficult to achieve by the existing common mineral admixture. Meanwhile, the performance-adjustable mineral admixture has high added value and market competitiveness, belongs to a high-performance mineral admixture, and has the characteristic of leading similar technologies.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic flow diagram of a process for preparing a performance-modifying mineral blend of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

The invention discloses a performance-adjustable mineral admixture, which comprises one or more of a workability-adjustable mineral admixture, a strength-adjustable mineral admixture and a volume-shrinkage-adjustable mineral admixture; the components of the workability adjusting type mineral admixture comprise cohesiveness adjusting superfine powder, fluidity adjusting superfine powder and chemical admixture; the components of the strength adjusting type mineral admixture comprise fluidity adjusting superfine powder, high activity superfine powder and chemical admixture; the volume contraction adjusting type mineral admixture comprises components of fluidity adjusting superfine powder, high-sulfur high-calcium phase superfine powder and chemical admixture; the particle diameters of the cohesiveness adjusting superfine powder, the fluidity adjusting superfine powder, the high-activity superfine powder and the high-sulfur calcium phase superfine powder are less than 8 mu m, and the median particle diameter D50 is 3 +/-1 mu m; the chemical additive is a liquid additive with the auxiliary adjusting function and the solid content of 25-45%.

Wherein the workability adjusting type mineral admixture consists of 10-20% of cohesiveness adjusting superfine powder, 60-80% of fluidity adjusting superfine powder and 0-0.3% of chemical admixture; the strength-adjustable mineral admixture consists of 5-25% of fluidity-adjustable superfine powder, 70-80% of high-activity superfine powder and 0-0.5% of chemical admixture; the volume contraction adjusting type mineral admixture is composed of 10-30% of fluidity adjusting superfine powder, 60-80% of high-sulfur high-calcium phase superfine powder and 0-0.2% of chemical admixture.

Specifically, the cohesiveness adjusting ultrafine powder is one or more of flue ash of a sorted ferrosilicon plant, flue ash of an industrial silicon plant and flue ash of a desiliconized zirconium plant; the fluidity adjusting superfine powder is one or more of pulverized coal furnace superfine fly ash, pulverized coal microbeads and coal gasification furnace superfine ash which are ground and sorted; the high-activity ultrafine powder is one or two of ultrafine blast furnace slag powder and ultrafine metakaolin; the high-sulfur high-calcium phase superfine powder is one or two of superfine circulating fluidized bed fly ash and superfine lithium slag powder which are ground and sorted; the chemical additive is composed of 0-5% of triethanolamine borate, 0-15% of calcium lignosulphonate, 5-10% of N-methyldiethanolamine, 0-8% of monoethanol diisopropanolamine, 0-10% of sodium acetate, 2-8% of molasses and 55-75% of water.

In order to prepare the performance-adjusting mineral admixture, the invention also provides a preparation method of the performance-adjusting mineral admixture, as shown in figure 1, which comprises the following steps:

step S1, grinding or sorting out corresponding ultrafine powder by using an ultrafine grinding process, wherein the particle size of the ultrafine powder is less than 8 mu m, the median particle size D50 is 3 +/-1 mu m, and the ultrafine powder comprises cohesiveness adjusting ultrafine powder, fluidity adjusting ultrafine powder, high-activity ultrafine powder and high-sulfur high-calcium phase ultrafine powder;

step S2, dissolving calcium lignocaine and sodium acetate in water according to the composition proportion, then sequentially adding triethanolamine borate, N-methyldiethanolamine, monoethanoldiisopropanolamine and molasses, and uniformly mixing to prepare a chemical additive, wherein the chemical additive is a liquid additive with an auxiliary adjusting function and a solid content of 25-45%;

and step S3, uniformly mixing the superfine powder and the chemical admixture of corresponding components according to the composition proportion of the workability adjusting type mineral admixture, the strength adjusting type mineral admixture and the volume contraction adjusting type mineral admixture, wherein the chemical admixture is sprayed on the surface of the superfine powder in a spraying mode, and thus the corresponding mineral admixtures with different performances are prepared.

It should be noted that the steps S1 and S2 are not limited to be performed sequentially, i.e., step S2 is performed first, and then step S2 is performed, or step S2 is performed first, and then step S1 is performed, which may be selected according to the requirement.

In summary, the performance-adjustable mineral admixture can be prepared by the method, and the performance-adjustable mineral admixture has at least the following beneficial effects:

1. the mineral admixture of the invention comprises various types such as workability adjusting type, strength adjusting type, volume shrinkage adjusting type and the like, not only fully utilizes industrial waste residues, but also effectively adjusts the workability or strength or volume stability of cement concrete, and overcomes the defect that the performance of the cement concrete is reduced or deteriorated when the traditional industrial waste residues are used as mineral admixtures.

2. The flue dust of ferrosilicon plants, the flue dust of industrial silicon plants and the flue dust of desiliconized zirconium plants are fully utilized to have the characteristics of amorphous state, hydrophobic and porous interior and fine particles, so that the problems of slurry adhesion, bleeding and the like of cement concrete can be effectively solved, and the cement concrete can be used as the cohesiveness regulating component; the ultrafine fly ash of the pulverized coal furnace, the fly ash microbeads and the ultrafine ash of the coal gasification furnace are mostly spherical or special in shape, have better morphological effect, micro-aggregate effect and the like, can effectively solve the problem of poor fluidity of cement concrete doped with solid waste admixture, and are used as the fluidity adjusting component of the invention. And furthermore, the two functional components are compounded to prepare the workability-adjustable mineral admixture, so that the synergistic superposition effect of the components can be fully exerted, the workability of the cement concrete is improved, and the prepared cement concrete has the characteristics of good cohesiveness and fluidity.

3. The invention fully utilizes the excellent activity effect and the micro-aggregate filling effect of the superfine blast furnace slag powder and the superfine metakaolin with the particle size of 0-8 mu m, and takes the superfine blast furnace slag powder and the superfine metakaolin as the components of the strength-adjustable mineral admixture, thereby effectively overcoming the influence of the common mineral admixture on the early strength of the cement concrete, improving the strength development of the cement concrete and optimizing the microstructure of the cement concrete.

4. The invention fully utilizes the characteristic that the superfine circulating fluidized bed fly ash and the superfine lithium slag powder contain more calcium sulfate phase, and carries out superfine grinding to destroy the hard shell structure of the calcium sulfate phase, so that the activity of the superfine circulating fluidized bed fly ash and the superfine lithium slag powder is improved, and the later generation delay of ettringite is avoided.

5. The triethanolamine borate, the N-methyldiethanolamine and the monoethanol diisopropanolamine in the additive have the functions of dispersing ultrafine powder and avoiding agglomeration, and also have the function of complexing calcium ions of a cementing material, so that the activity of a mineral admixture is particularly promoted to be improved; the calcium lignosulphonate has the effect of assisting in optimizing the workability of cement concrete, and the sodium acetate and molasses components have the effect of assisting in adjusting the hydration rate. The invention prepares the auxiliary admixture by compounding the different components, not only further promotes the performance of the performance-adjustable mineral admixture, but also improves the adaptability of the performance-adjustable mineral admixture to different cement concrete materials.

6. Compared with the existing mineral admixture, the invention belongs to a dual-purpose or multi-purpose admixture, not only can replace the cement dosage, but also can effectively improve the performance of cement concrete, and particularly can meet the requirements of modern high-strength and high-performance concrete, which is difficult to achieve by the existing common mineral admixture. Meanwhile, the performance-adjustable mineral admixture has high added value and market competitiveness, belongs to a high-performance mineral admixture, and has the characteristic of leading similar technologies.

To facilitate this detailed description, a number of specific examples are provided below.