CN111548034B - Auxiliary cementing material utilizing circulating fluidized bed fly ash and preparation method thereof - Google Patents
Auxiliary cementing material utilizing circulating fluidized bed fly ash and preparation method thereof Download PDFInfo
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- 239000010881 fly ash Substances 0.000 title claims abstract description 94
- 239000000463 material Substances 0.000 title claims abstract description 45
- 238000002360 preparation method Methods 0.000 title abstract description 8
- 239000002245 particle Substances 0.000 claims abstract description 54
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 51
- 239000000126 substance Substances 0.000 claims abstract description 40
- 239000000654 additive Substances 0.000 claims abstract description 10
- 230000000996 additive effect Effects 0.000 claims abstract description 10
- 239000007788 liquid Substances 0.000 claims abstract description 7
- 239000007787 solid Substances 0.000 claims abstract description 7
- 239000000843 powder Substances 0.000 claims description 57
- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 claims description 32
- 239000002893 slag Substances 0.000 claims description 22
- UPCXAARSWVHVLY-UHFFFAOYSA-N tris(2-hydroxyethyl)azanium;acetate Chemical compound CC(O)=O.OCCN(CCO)CCO UPCXAARSWVHVLY-UHFFFAOYSA-N 0.000 claims description 18
- HXKKHQJGJAFBHI-UHFFFAOYSA-N 1-aminopropan-2-ol Chemical compound CC(O)CN HXKKHQJGJAFBHI-UHFFFAOYSA-N 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 17
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 claims description 16
- 238000000227 grinding Methods 0.000 claims description 15
- 235000013379 molasses Nutrition 0.000 claims description 15
- 239000003245 coal Substances 0.000 claims description 13
- 235000019738 Limestone Nutrition 0.000 claims description 12
- 239000006028 limestone Substances 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 11
- 239000011325 microbead Substances 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 230000003750 conditioning effect Effects 0.000 claims description 6
- 238000005457 optimization Methods 0.000 claims description 6
- 239000010883 coal ash Substances 0.000 claims description 2
- 239000007921 spray Substances 0.000 claims description 2
- 102220043159 rs587780996 Human genes 0.000 claims 6
- 238000004519 manufacturing process Methods 0.000 claims 1
- 239000011802 pulverized particle Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 20
- 239000004568 cement Substances 0.000 abstract description 15
- 239000004567 concrete Substances 0.000 abstract description 10
- 239000004566 building material Substances 0.000 abstract description 2
- 230000036571 hydration Effects 0.000 description 10
- 238000006703 hydration reaction Methods 0.000 description 10
- 239000011575 calcium Substances 0.000 description 6
- 229910052791 calcium Inorganic materials 0.000 description 6
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 4
- 229910001653 ettringite Inorganic materials 0.000 description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 description 4
- 239000011707 mineral Substances 0.000 description 4
- 239000011593 sulfur Substances 0.000 description 4
- 229910052717 sulfur Inorganic materials 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 229910052925 anhydrite Inorganic materials 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L calcium carbonate Substances [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 229910001424 calcium ion Inorganic materials 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 230000000536 complexating effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 125000000524 functional group Chemical group 0.000 description 2
- 230000000877 morphologic effect Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 2
- 239000002910 solid waste Substances 0.000 description 2
- 238000005063 solubilization Methods 0.000 description 2
- 230000007928 solubilization Effects 0.000 description 2
- 239000011362 coarse particle Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/26—Cements from oil shales, residues or waste other than slag from raw materials containing flue dust, i.e. fly ash
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
- C04B7/153—Mixtures thereof with other inorganic cementitious materials or other activators
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses an auxiliary cementing material utilizing circulating fluidized bed fly ash and a preparation method thereof, wherein the auxiliary cementing material comprises 60-80% of superfine circulating fluidized bed fly ash, the particle size of the superfine circulating fluidized bed fly ash is less than 17 mu m, and the median particle size D50 is 5 +/-1 mu m; 5-20% of water demand optimizing component, wherein the particle size of the water demand optimizing component is less than 10 mu m, and the median particle size D50 is 4 +/-1 mu m; 10-25% of a volume stability optimizing component, wherein the median particle diameter D50 of the volume stability optimizing component is 15-20 μm; and 0-0.5% of chemical regulation and control component, wherein the chemical regulation and control component is a liquid additive with solid content of 30-50%; specifically, the invention can promote the utilization rate of the building material resource of the circulating fluidized bed fly ash, improve the application effect of the circulating fluidized bed fly ash as an auxiliary cementing material in cement concrete, and practically solve the problem that the circulating fluidized bed fly ash is difficult to be effectively utilized in the prior art.
Description
Technical Field
The invention relates to the field of auxiliary cementing materials, in particular to an auxiliary cementing material utilizing circulating fluidized bed fly ash and a preparation method thereof.
Background
The circulating fluidized bed combustion technology is a new high-efficiency, low-pollution and clean coal-fired technology which is rapidly developed in the last two decades, and is rapidly popularized and applied in China at present. With the popularization and large-scale development of CFB coal burning technology in China, the emission of combustion products is increasing day by day. Because the combustion temperature (850 ℃ -950 ℃) of the circulating fluidized bed boiler is obviously lower than that (the highest temperature of 1500 ℃) of a common pulverized coal furnace boiler, fundamental difference exists between the circulating fluidized bed fly ash and the common pulverized coal furnace fly ash in a forming mechanism, and the physical and chemical properties (including chemical components, mineral compositions, particle composition, morphology, activity and the like) of the circulating fluidized bed fly ash and the common fly ash have larger difference. From a great deal of research literature, circulating fluidized bed fly ash not only has similar pozzolanic activity to common fly ash, but also has self-hardening performance, and both the pozzolanic activity and the self-hardening performance of the circulating fluidized bed fly ash are stronger than those of the fly ash, which indicates that the circulating fluidized bed fly ash has great potential as an auxiliary cementing material for cement concrete.
However, compared with ordinary pulverized coal furnace fly ash, the circulating fluidized bed fly ash has poorer particle surface physical properties (coarse particles, uneven and porous structure) and higher CaSO content4And f-CaO and the like, so that when the circulating fluidized bed fly ash is used for a cement-based material, people generally worry that the workability, the volume stability, the strength development and the like of cement concrete of the circulating fluidized bed fly ash can be greatly influenced, the application of the circulating fluidized bed fly ash in the cement concrete material is limited, the resource utilization rate is low, the circulating fluidized bed fly ash is accumulated year by year, a large amount of land is occupied, and the environment is polluted.
Therefore, the physicochemical properties of the fly ash of the circulating fluidized bed need to be optimized and modified so as to promote the resource utilization level of the fly ash, and particularly improve the resource application effect of the fly ash as a building material of an auxiliary cementing material.
Disclosure of Invention
The invention aims to provide an auxiliary cementing material utilizing circulating fluidized bed fly ash and a preparation method thereof, and aims to solve the problem that the circulating fluidized bed fly ash is difficult to effectively utilize in the prior art.
In order to solve the technical problems, the invention provides an auxiliary cementing material utilizing circulating fluidized bed fly ash, which comprises 60-80% of superfine circulating fluidized bed fly ash, wherein the particle size of the superfine circulating fluidized bed fly ash is less than 17 mu m, and the median particle size D50 is 5 +/-1 mu m; 5-20% of a water demand optimizing component, wherein the particle size of the water demand optimizing component is less than 10 microns, and the median particle size D50 is 4 +/-1 microns; 10-25% of a volume stability optimizing component, wherein the median particle diameter D50 of the volume stability optimizing component is 15-20 μm; and 0-0.5% of a chemical regulation component, wherein the chemical regulation component is a liquid additive with solid content of 30-50%.
In one embodiment, the water demand optimizing component is composed of one or more of ultrafine slag powder, ultrafine coal furnace fly ash and fly ash microbeads.
In one embodiment, the volume stability optimizing component is comprised of one or more of blast furnace slag powder, limestone powder, and tailings powder.
In one embodiment, the chemical regulation and control component comprises 5-15% of triethanolamine acetate, 5-10% of triethylene glycol, 0-5% of diethanol monoisopropanolamine, 5-15% of calcium nitrate, 0-5% of molasses and 50-70% of water.
In order to solve the technical problems, the invention also provides a preparation method of the auxiliary cementing material, which comprises the following steps:
step S1, grinding or sorting out corresponding superfine circulating fluidized bed fly ash, water demand optimizing component and volume stability optimizing component by adopting a grinding process; the particle size of the superfine circulating fluidized bed fly ash is less than 17 mu m, and the median particle size D50 is 5 +/-1 mu m; the particle size of the water demand optimizing component is less than 10 mu m, and the median particle size D50 is 4 +/-1 mu m; the volume stability optimizing component has a median particle diameter D50 of 15-20 μm;
step S2, preparing a chemical regulation component, wherein the chemical regulation component is a liquid additive with solid content of 30-50%;
step S3, uniformly mixing the superfine circulating fluidized bed fly ash, the water demand optimizing component, the volume stability optimizing component and the chemical regulation and control component according to the composition proportion to prepare the auxiliary cementing material; the coal ash content of the superfine circulating fluidized bed is 60-80%, the water demand optimization component is 5-20%, the volume stability optimization component is 10-25%, and the chemical regulation component is 0-0.5%.
In one embodiment, in step S1, one or more of the ultrafine slag powder, the ultrafine coal furnace fly ash, and the fly ash micro-beads are ground or sorted by a grinding process to obtain the water demand optimizing component.
In one embodiment, in step S1, one or more of the blast furnace slag powder, limestone powder, and tailings powder are ground or sorted using a grinding process to obtain the volume stability optimizing component.
In one embodiment, in step S2, calcium nitrate is dissolved in water according to the composition ratio, then triethanolamine acetate, triethylene glycol, diethanol monoisopropanolamine and molasses are sequentially added, and the chemical regulation component is prepared after uniform mixing; the water content is 50-70%, the calcium nitrate content is 5-15%, the triethanolamine acetate content is 5-15%, the triethylene glycol content is 5-10%, the diethanol monoisopropanolamine content is 0-5%, and the molasses content is 0-5%.
In one embodiment, in step S3, the chemical conditioning component is sprayed on the surface of the ultrafine powder particles formed by mixing the ultrafine circulating fluidized bed fly ash, the water demand optimizing component and the volume stability optimizing component.
The invention has the following beneficial effects:
1. the invention not only makes use of a large amount of solid wastes which are difficult to treat, such as fly ash of the circulating fluidized bed, but also the prepared auxiliary cementing material has the excellent characteristics of low water demand, high activity and good volume stability.
2. In order to solve the problems of water demand increase, fluidity reduction and the like caused by the porous structure of the fly ash particles of the circulating fluidized bed and the like, on one hand, the invention preferably selects the superfine fly ash of the circulating fluidized bed with the particle size less than 17 mu m, and the particle appearance and the pore structure of the superfine fly ash are greatly improved; on the other hand, water demand optimizing components are introduced, and the adverse effects of the circulating fluidized bed fly ash on the water demand and the workability of the auxiliary cementing material are further eliminated by utilizing the morphological effect, the micro-aggregate effect and the like of the superfine powder less than 10 mu m.
3. The volume stability optimizing component of the invention is one or more of blast furnace slag powder, limestone powder and tailing powder, wherein the contractibility of the slag powder in hydration hardening can partially offset the hydration expansibility of high-sulfur and high-calcium phases in the fly ash of the circulating fluidized bed; the limestone powder and the tailing powder contain a large amount of CaCO3Minerals that form a carbonate ettringite phase by combining with the hydration products of the high sulfur phase in the circulating fluidized bed fly ashCO3AFt, which acts as a volume stability of ettringite.
4. The chemical regulation and control component is prepared from triethanolamine acetate, triethylene glycol, diethanol monoisopropanolamine, calcium nitrate, molasses and water, and has low doping amount and obvious effect. The expression is as follows: firstly, triethanolamine acetate, triethylene glycol and diethanol monoisopropanolamine can disperse and prevent the ultrafine powder in the invention from agglomerating; secondly, the amino functional groups in the molecules of the triethanolamine acetate and the diethanol monoisopropanolamine have the complexing solubilization function on calcium ions, so that the hydration activity is improved, the dissolution of high calcium phases such as free calcium, anhydrite and the like in the circulating fluidized bed fly ash can be improved, and the occurrence of later-stage volume expansion is eliminated; thirdly, the hydration rate of the auxiliary cementing material can be properly adjusted by the components of calcium nitrate and molasses, so that the auxiliary cementing material can be prevented from generating great influence on the setting and hardening time of cement concrete, and in addition, the early and later period activity of the auxiliary cementing material can be respectively improved; fourthly, the chemical regulation and control component can improve the application effect and adaptability of the auxiliary cementing material in cement concrete materials on the whole, and is beneficial to popularization and application in different types of cement concrete.
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 the preparation of supplementary cementitious materials in accordance with 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 an auxiliary cementing material utilizing circulating fluidized bed fly ash, which comprises 60-80% of superfine circulating fluidized bed fly ash, wherein the particle size of the superfine circulating fluidized bed fly ash is less than 17 mu m, and the median particle size D50 is 5 +/-1 mu m; 5-20% of water demand optimizing component, wherein the particle size of the water demand optimizing component is less than 10 mu m, and the median particle size D50 is 4 +/-1 mu m; 10-25% of a volume stability optimizing component, wherein the median particle diameter D50 of the volume stability optimizing component is 15-20 μm; and 0-0.5% of chemical regulation and control component, wherein the chemical regulation and control component is a liquid additive with solid content of 30-50%.
Wherein, the water demand optimizing component consists of one or more of superfine slag powder, superfine coal powder furnace fly ash and fly ash micro-beads; the volume stability optimizing component is composed of one or more of blast furnace slag powder, limestone powder and tailing powder; the chemical regulation and control component comprises 5-15% of triethanolamine acetate, 5-10% of triethylene glycol, 0-5% of diethanol monoisopropanolamine, 5-15% of calcium nitrate, 0-5% of molasses and 50-70% of water.
In order to prepare the auxiliary cementing material, the invention also provides a preparation method of the auxiliary cementing material, as shown in figure 1, which comprises the following steps:
step S1, grinding or sorting out corresponding superfine circulating fluidized bed fly ash, water demand optimizing component and volume stability optimizing component by adopting a grinding process; the particle size of the superfine circulating fluidized bed fly ash is less than 17 mu m, and the median particle size D50 is 5 +/-1 mu m; the particle size of the water demand optimizing component is less than 10 mu m, and the median particle size D50 is 4 +/-1 mu m; the median particle size D50 of the volume stability optimizing component is 15-20 mu m;
step S2, preparing a chemical regulation component which is a liquid additive with solid content of 30-50%;
step S3, uniformly mixing the superfine fly ash of the circulating fluidized bed, the water demand optimizing component, the volume stability optimizing component and the chemical regulation component according to the composition proportion to prepare an auxiliary cementing material; wherein the content of the superfine circulating fluidized bed fly ash is 60-80%, the water demand optimization component is 5-20%, the volume stability optimization component is 10-25%, and the chemical regulation component is 0-0.5%.
Specifically, in step S1, one or more of ultrafine slag powder, ultrafine coal-powder furnace fly ash, and fly ash microbeads are ground or sorted by a grinding process to obtain water demand optimizing components; and one or more of blast furnace slag powder, limestone powder and tailing powder are ground or sorted by a grinding process to obtain a volume stability optimized component.
In step S2, calcium nitrate is dissolved in water according to the composition proportion, then triethanolamine acetate, triethylene glycol, diethanol monoisopropanolamine and molasses are sequentially added, and the chemical regulation and control component is prepared after uniform mixing; wherein, the water accounts for 50-70%, the calcium nitrate accounts for 5-15%, the triethanolamine acetate accounts for 5-15%, the triethylene glycol accounts for 5-10%, the diethanol monoisopropanolamine accounts for 0-5%, and the molasses accounts for 0-5%.
In step S3, the chemical conditioning component is sprayed onto the surface of the ultrafine powder particles in a spray pattern, and the ultrafine powder particles are formed by mixing the ultrafine circulating fluidized bed fly ash, the water demand optimizing component, and the volume stability optimizing component.
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 auxiliary binding material can be prepared by the method, and the auxiliary binding material has at least the following beneficial effects:
1. the invention not only makes use of a large amount of solid wastes which are difficult to treat, such as fly ash of the circulating fluidized bed, but also the prepared auxiliary cementing material has the excellent characteristics of low water demand, high activity and good volume stability.
2. In order to solve the problems of water demand increase, fluidity reduction and the like caused by the porous structure of the fly ash particles of the circulating fluidized bed and the like, on one hand, the invention preferably selects the superfine fly ash of the circulating fluidized bed with the particle size less than 17 mu m, and the particle appearance and the pore structure of the superfine fly ash are greatly improved; on the other hand, water demand optimizing components are introduced, and the adverse effects of the circulating fluidized bed fly ash on the water demand and the workability of the auxiliary cementing material are further eliminated by utilizing the morphological effect, the micro-aggregate effect and the like of the superfine powder less than 10 mu m.
3. The volume stability optimizing component of the invention is one or more of blast furnace slag powder, limestone powder and tailing powder, wherein the contractibility of the slag powder in hydration hardening can partially offset the hydration expansibility of high-sulfur and high-calcium phases in the fly ash of the circulating fluidized bed; the limestone powder and the tailing powder contain a large amount of CaCO3Minerals that form carbonate ettringite phase CO by combining with the hydration products of the high sulfur phase in circulating fluidized bed fly ash3AFt, which acts as a volume stability of ettringite.
4. The chemical regulation and control component is prepared from triethanolamine acetate, triethylene glycol, diethanol monoisopropanolamine, calcium nitrate, molasses and water, and has low doping amount and obvious effect. The expression is as follows: firstly, triethanolamine acetate, triethylene glycol and diethanol monoisopropanolamine can disperse and prevent the ultrafine powder in the invention from agglomerating; secondly, the amino functional groups in the molecules of the triethanolamine acetate and the diethanol monoisopropanolamine have the complexing solubilization function on calcium ions, so that the hydration activity is improved, the dissolution of high calcium phases such as free calcium, anhydrite and the like in the circulating fluidized bed fly ash can be improved, and the occurrence of later-stage volume expansion is eliminated; thirdly, the hydration rate of the auxiliary cementing material can be properly adjusted by the components of calcium nitrate and molasses, so that the auxiliary cementing material can be prevented from generating great influence on the setting and hardening time of cement concrete, and in addition, the early and later period activity of the auxiliary cementing material can be respectively improved; fourthly, the chemical regulation and control component can improve the application effect and adaptability of the auxiliary cementing material in cement concrete materials on the whole, and is beneficial to popularization and application in different types of cement concrete.
To facilitate this detailed description, a number of specific examples are provided below.
Example 1
Firstly, adopting a grinding process to grind or sort superfine circulating fluidized bed fly ash with the grain diameter of less than 17 mu m and the median grain diameter D50 of 5 +/-1 mu m, superfine slag powder with the grain diameter of less than 10 mu m and the median grain diameter D50 of 4 +/-1 mu m, limestone powder with the median grain diameter D50 of 15-20 mu m and tailing slag powder; secondly, mixing 65% of water, 10% of triethanolamine acetate, 5% of triethylene glycol, 15% of calcium nitrate and 5% of molasses uniformly in sequence to prepare a chemical regulation component; finally, while 70% of the ultrafine circulating fluidized bed fly ash, 15% of the ultrafine slag powder, 5% of the limestone powder and 10% of the tailing powder are uniformly mixed, 0.15% of the chemical conditioning additive is sprayed on the surfaces of the particles in a spraying manner, so that the auxiliary cementing material utilizing the circulating fluidized bed fly ash is obtained.
Example 2
Firstly, adopting a grinding process to grind or sort superfine circulating fluidized bed fly ash with the particle size of less than 17 mu m and the median particle size D50 of 5 +/-1 mu m, superfine pulverized coal furnace fly ash with the particle size of less than 10 mu m and the median particle size D50 of 4 +/-1 mu m, and tailing slag powder with the median particle size D50 of 15-20 mu m; secondly, uniformly mixing 70% of water, 10% of calcium nitrate, 5% of triethanolamine acetate, 10% of triethylene glycol and 5% of diethanol monoisopropanolamine in sequence to prepare a chemical regulation component; finally, while 75% of the ultrafine circulating fluidized bed fly ash, 15% of the ultrafine pulverized coal furnace fly ash and 10% of the tailings powder are uniformly mixed, 0.15% of the chemical conditioning additive is sprayed on the surfaces of the particles in a spraying manner, so that the auxiliary cementing material utilizing the circulating fluidized bed fly ash is obtained.
Example 3
Firstly, adopting a grinding process to grind or sort superfine circulating fluidized bed fly ash with the grain diameter of less than 17 mu m and the median grain diameter D50 of 5 +/-1 mu m, superfine pulverized coal furnace fly ash with the grain diameter of less than 10 mu m and the median grain diameter D50 of 4 +/-1 mu m, fly ash microbeads and slag powder with the median grain diameter D50 of 15-20 mu m; secondly, uniformly mixing 60% of water, 15% of calcium nitrate, 5% of triethanolamine acetate, 10% of triethylene glycol, 5% of diethanol monoisopropanolamine and 5% of molasses in sequence to prepare a chemical regulation component; finally, while 65% of the ultrafine circulating fluidized bed fly ash, 10% of the ultrafine pulverized coal furnace fly ash, 5% of the fly ash microbeads and 20% of the slag powder are uniformly mixed, 0.1% of the chemical conditioning additive is sprayed on the surfaces of the particles in a spraying manner, so that the auxiliary cementing material utilizing the circulating fluidized bed fly ash is obtained.
Related experiments and results
The cement performance comparison tests of different auxiliary cementing materials obtained in examples 1 to 3 are carried out, 95-grade mineral powder and I-grade fly ash are respectively selected as a control group, the test formula is shown in table 1, and the test results are shown in table 2.
TABLE 1 proportion/kg for comparative tests of Cement Properties
TABLE 2 Cement Performance test results
As can be seen from Table 2, when the auxiliary cementing material provided by the embodiment of the invention is used in cement, the mortar fluidity is not much different from that of a control group, the strength and the volume stability are both superior to those of the control group, and a good application effect is shown.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (5)
1. An auxiliary cementing material utilizing fly ash of a circulating fluidized bed is characterized by comprising the following components,
60-80% of superfine circulating fluidized bed fly ash, wherein the particle size of the superfine circulating fluidized bed fly ash is less than 17 microns, and the median particle size D50=5 +/-1 microns;
5-20% of a water demand optimizing component, wherein the particle size of the water demand optimizing component is less than 10 μm, and the median particle size D50=4 +/-1 μm;
10-25% of a volume stability optimizing component, wherein the volume stability optimizing component has a median particle diameter D50= 15-20 μm;
and 0-0.5% of a chemical regulation component, wherein the chemical regulation component is a liquid additive with solid content of 30-50%; the chemical regulation and control component comprises 5-15% of triethanolamine acetate, 5-10% of triethylene glycol, 0-5% of diethanol monoisopropanolamine, 5-15% of calcium nitrate, 0-5% of molasses and 50-70% of water;
the water demand optimizing component consists of one or more of superfine slag powder, superfine coal powder furnace fly ash and fly ash microbeads;
the volume stability optimizing component is composed of one or more of blast furnace slag powder, limestone powder and tailing powder.
2. A method of making a supplementary cementitious material, for use in making a supplementary cementitious material according to claim 1, comprising the steps of:
step S1, grinding or sorting out corresponding superfine circulating fluidized bed fly ash, water demand optimizing component and volume stability optimizing component by adopting a grinding process; the particle size of the superfine circulating fluidized bed fly ash is less than 17 mu m, and the median particle size D50=5 +/-1 mu m; the particle size of the water demand optimizing component is less than 10 mu m, and the median particle size D50=4 +/-1 mu m; the volume stability optimizing component has a median particle diameter D50= 15-20 μm;
step S2, preparing a chemical regulation component, wherein the chemical regulation component is a liquid additive with solid content of 30-50%; dissolving calcium nitrate in water according to the composition proportion, then sequentially adding triethanolamine acetate, triethylene glycol, diethanol monoisopropanolamine and molasses, and uniformly mixing to prepare the chemical regulation and control component; wherein the water accounts for 50-70%, the calcium nitrate accounts for 5-15%, the triethanolamine acetate accounts for 5-15%, the triethylene glycol accounts for 5-10%, the diethanol monoisopropanolamine accounts for 0-5%, and the molasses accounts for 0-5%;
step S3, uniformly mixing the superfine circulating fluidized bed fly ash, the water demand optimizing component, the volume stability optimizing component and the chemical regulation and control component according to the composition proportion to prepare the auxiliary cementing material; the coal ash content of the superfine circulating fluidized bed is 60-80%, the water demand optimization component is 5-20%, the volume stability optimization component is 10-25%, and the chemical regulation component is 0-0.5%.
3. The method of claim 2, wherein in step S1, one or more of the ultrafine slag powder, the ultrafine coal furnace fly ash, and the fly ash micro beads are ground or sorted by a grinding process to obtain the water demand optimizing component.
4. The method of claim 2, wherein in step S1, one or more of blast furnace slag powder, limestone powder and tailings powder are ground or sorted by a grinding process to obtain the volume stability optimizing component.
5. The method of claim 2, wherein the chemical conditioning component is sprayed in a spray manner on the surface of the ultrafine pulverized particles mixed by the ultrafine circulating fluidized bed fly ash, the water demand optimizing component and the volume stability optimizing component in step S3.
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| CN101367631A (en) * | 2008-09-27 | 2009-02-18 | 天津水泥工业设计研究院有限公司 | Ultra-fine coal ash based composite mineral blending material and manufacturing method thereof |
| CN109336444A (en) * | 2018-12-12 | 2019-02-15 | 盐城市国泰混凝土有限公司 | Slag processing agent mixes steel slag ready-mixed concrete and preparation method thereof |
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| CN110282888A (en) * | 2019-07-04 | 2019-09-27 | 山西平朔煤矸石发电有限责任公司 | A kind of circulating fluid bed coal ash base supplementary cementitious material and its preparation method and application |
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| CN109336444A (en) * | 2018-12-12 | 2019-02-15 | 盐城市国泰混凝土有限公司 | Slag processing agent mixes steel slag ready-mixed concrete and preparation method thereof |
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