CN117361917A - Lithium slag composite admixture, preparation method thereof and sprayed concrete - Google Patents
Lithium slag composite admixture, preparation method thereof and sprayed concrete Download PDFInfo
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- CN117361917A CN117361917A CN202311423439.0A CN202311423439A CN117361917A CN 117361917 A CN117361917 A CN 117361917A CN 202311423439 A CN202311423439 A CN 202311423439A CN 117361917 A CN117361917 A CN 117361917A
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- lithium slag
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- composite admixture
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- cement
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 85
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 85
- 239000002893 slag Substances 0.000 title claims abstract description 85
- 239000002131 composite material Substances 0.000 title claims abstract description 49
- 239000011378 shotcrete Substances 0.000 title claims abstract description 40
- 238000002360 preparation method Methods 0.000 title claims abstract description 25
- 238000003756 stirring Methods 0.000 claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000004568 cement Substances 0.000 claims abstract description 26
- 239000000843 powder Substances 0.000 claims abstract description 26
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 13
- 239000011324 bead Substances 0.000 claims abstract description 11
- 239000002245 particle Substances 0.000 claims abstract description 11
- 239000012615 aggregate Substances 0.000 claims abstract description 3
- 239000004115 Sodium Silicate Substances 0.000 claims description 12
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 12
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 9
- 238000001354 calcination Methods 0.000 claims description 9
- 239000004576 sand Substances 0.000 claims description 9
- 239000011398 Portland cement Substances 0.000 claims description 8
- 229910021487 silica fume Inorganic materials 0.000 claims description 8
- 239000004575 stone Substances 0.000 claims description 8
- 239000002994 raw material Substances 0.000 claims description 5
- 238000006467 substitution reaction Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 1
- 239000004567 concrete Substances 0.000 abstract description 55
- 230000000694 effects Effects 0.000 abstract description 13
- 239000003513 alkali Substances 0.000 abstract description 7
- 238000002156 mixing Methods 0.000 abstract description 7
- 239000011521 glass Substances 0.000 abstract description 6
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 abstract description 3
- 230000003628 erosive effect Effects 0.000 abstract description 3
- 230000005284 excitation Effects 0.000 abstract description 3
- 238000011049 filling Methods 0.000 abstract description 3
- 230000002528 anti-freeze Effects 0.000 abstract description 2
- 238000011161 development Methods 0.000 abstract description 2
- 238000012545 processing Methods 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 17
- 239000000203 mixture Substances 0.000 description 16
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 13
- 239000002253 acid Substances 0.000 description 7
- 238000000227 grinding Methods 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 150000001875 compounds Chemical class 0.000 description 4
- 229910001653 ettringite Inorganic materials 0.000 description 4
- 238000006703 hydration reaction Methods 0.000 description 4
- 238000010257 thawing Methods 0.000 description 4
- 230000006872 improvement Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000011863 silicon-based powder Substances 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 238000003837 high-temperature calcination Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 238000007655 standard test method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/0427—Dry materials
-
- 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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00146—Sprayable or pumpable mixtures
- C04B2111/00155—Sprayable, i.e. concrete-like, materials able to be shaped by spraying instead of by casting, e.g. gunite
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/2015—Sulfate resistance
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/2023—Resistance against alkali-aggregate reaction
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
Abstract
The invention discloses a lithium slag composite admixture, a preparation method thereof and sprayed concrete, which belong to the technical field of concrete processing. Mixing and stirring cement, aggregate, water and the composite admixture, adding a water reducing agent, adding an accelerator after stirring, and uniformly stirring to prepare the sprayed concrete. The invention improves the early strength of concrete by filling effect and alkali excitation principle, does not reduce the later strength, can effectively inhibit sulfate erosion and alkali aggregate reaction of the concrete, enhances the impermeability of the concrete and improves the durability. Particularly, the concrete can replace antifreeze under the condition of low temperature in winter, and the development of the concrete strength is ensured. The balling rate of the ground lithium slag powder is more than 70%, and the sinking beads are round particles, so that the fluidity of the concrete is increased through the glass body effect.
Description
Technical Field
The invention belongs to the technical field of concrete processing, and particularly relates to a lithium slag composite admixture, a preparation method thereof and sprayed concrete.
Background
The lithium slag contains more SiO 2 、Al 2 O 3 And the chemical substances have higher pozzolanic activity and can be used as mineral admixture for cement concrete. However, the lithium slag is directly pulverized and added into the concrete, the activity of the lithium slag is often not fully excited, and the prepared concrete has low strength in 7 days and 28 days. In addition, the existing lithium slag powder is of a porous structure and has a larger specific surface area, so that the water demand is large, and the fluidity of the concrete is reduced.
In order to fully exert the activity of the lithium slag, the lithium slag is ground into powder, and the activity of the lithium slag is further promoted by an alkali excitant, so that the compressive strength of the concrete is improved, and the impermeability, frost resistance and the like of the concrete can be enhanced. Based on the principle, naOH is adopted as an alkali-exciting agent in alkali-excited lithium slag concrete test research in the prior art, the strength of the concrete tends to be increased and then reduced along with the increase of the doping amount of the NaOH, and meanwhile, the increase of the using amount of the NaOH leads to the improvement of the alkalinity of the concrete, the alkali-aggregate reaction is easy to occur, the aggregate and the NaOH are subjected to chemical reaction, the expansion, cracking and even damage of the concrete structure are caused, and the concrete structure is seriously crashed. In addition, in the prior art, in order to improve the early strength of the concrete, an accelerator is generally added when preparing the sprayed concrete, but the early strength of the prepared concrete still needs to be improved.
Therefore, there is a need in the art for a lithium slag composite admixture that can further improve the flowability, early strength, barrier grade and freeze resistance of concrete.
Disclosure of Invention
The invention aims to provide a lithium slag composite admixture, a preparation method thereof and sprayed concrete, so as to solve the problems in the prior art.
One of the technical schemes provided by the invention is as follows:
the preparation method of the lithium slag composite admixture comprises the steps of calcining and grinding lithium slag to obtain lithium slag powder, mixing the lithium slag powder, deposited beads, silica fume and sodium silicate, and uniformly stirring to obtain the lithium slag composite admixture.
Preferably, the temperature of the calcination is 900 ℃.
The particle shape with too low calcination temperature is mostly amorphous, and the particle shape is defective and is mostly incomplete sphere; too high a calcination temperature may result in further improvement in crystallinity, increase in particle size, and decrease in the number of crystals.
Preferably, the specific surface area of the ground lithium slag powder is 800+/-50 square meters/, and the balling rate of the ground lithium slag powder is not less than 70%.
The spherical crystal is reduced due to the excessively small specific surface area, the glass body effect is reduced, the particle agglomeration phenomenon can occur due to the excessively high specific surface area, the dispersibility is poor in the subsequent use process, and the glass body effect is also reduced.
Preferably, the mass ratio of the lithium slag powder to the precipitated beads to the silica fume to the sodium silicate is (3-4) to (2-3) to (0.5-1) to (0.1-0.5).
The second technical scheme provided by the invention is as follows:
the lithium slag composite admixture prepared by the preparation method.
The third technical scheme provided by the invention is as follows:
the application of the lithium slag composite admixture in sprayed concrete is that the lithium slag composite admixture is used for partially replacing cement in sprayed concrete raw materials; wherein the substitution rate of the composite admixture to the cement is 14-40%.
The invention provides a technical scheme that:
the sprayed concrete comprises the following raw materials in parts by mass: 3-20 parts of the composite admixture, 10-30 parts of cement, 40-75 parts of aggregate, 0.08-0.6 part of water reducer and 1.0-3.0 parts of accelerator, wherein the water cement ratio of the sprayed concrete is 0.36-0.42.
In the preparation of sprayed concrete, the larger the amount of accelerator is, the better the early strength is, and the optimal value exists for the amount of accelerator. The setting time of the accelerator can be shortened, and the early strength can be improved, because a large amount of ettringite can be quickly generated after the accelerator is added, and the accelerator has a space network structure. With the progress of cement hydration reaction, the hydration products gradually fill the space formed by ettringite, so that the ettringite is compact. When ettringite is too much, the cement stone structure has larger defects, but the problem of low early and later strength can occur. The addition of a large amount of accelerator is avoided, and the lithium slag composite admixture is added on the basis of the conventional addition amount of the accelerator, so that the sprayed concrete with good early strength can be obtained.
Preferably, the cement is ordinary Portland cement; the aggregate comprises fine aggregate and coarse aggregate; the accelerator is an alkali-free accelerator; the alkali water agent is a polycarboxylic acid high-performance water reducer.
More preferably, the fine aggregate is artificial sand or natural sand with the particle size smaller than 4.75mm, and the coarse aggregate is stone with the particle size of 5-10 mm.
The technical scheme provided by the invention is as follows:
the preparation method of the sprayed concrete comprises the steps of mixing and stirring cement, aggregate, water and the composite admixture, adding a water reducing agent in the stirring process, adding an accelerator after stirring, and continuously and uniformly stirring to prepare the sprayed concrete.
Preferably, the stirring time is 2min, and the stirring continuing time is 15s.
The invention has the beneficial effects that:
the invention is to compound the lithium slag into a new lithium slag compound admixture with deposited beads, silicon powder and sodium silicate after high-temperature calcination and grinding, the quality of the obtained compound admixture is added into concrete instead of cement, the silicon powder has a filling effect, the total volume and the total quality of the compound admixture can be improved, the concrete is convenient to add, the sodium silicate can excite the volcanic ash activity of the lithium slag powder, the hydration reaction of the lithium slag powder is improved, the early strength of the concrete is improved, the later strength is not reduced by the filling effect and the alkali excitation principle, the sulfate erosion and alkali aggregate reaction of the concrete can be effectively inhibited, the impermeability of the concrete is enhanced, and the durability is improved. Particularly, the concrete can replace antifreeze under the condition of low temperature in winter, and the development of the concrete strength is ensured. The balling rate of the ground lithium slag powder is not less than 70%, and the sinking beads are round particles, so that the fluidity of the concrete is increased through the glass body effect.
The sprayed concrete provided by the invention comprises 3-20 parts of composite admixture, 10-30 parts of cement, 40-75 parts of aggregate, 0.08-0.6 part of water reducer, 1.0-3.0 parts of accelerator and the water cement ratio of the sprayed concrete is controlled to be 0.36-0.42. The sprayed concrete adopts a small amount of accelerator, and the lithium slag powder with volcanic ash activity in the composite admixture and cement are subjected to hydration reaction in the early stage of the concrete under the excitation of sodium silicate, so that cement paste is quickly coagulated and loses plasticity, aggregate is bonded, the early strength of the concrete is improved, the later strength is not reduced, sulfate erosion and alkali aggregate reaction of the concrete can be effectively inhibited, the impermeability of the concrete is enhanced, and the durability is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a SEM image of the lithium slag powder prepared in example 1.
Detailed Description
Various exemplary embodiments of the invention will now be described in detail, which should not be considered as limiting the invention, but rather as more detailed descriptions of certain aspects, features and embodiments of the invention.
It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In addition, for numerical ranges in this disclosure, it is understood that each intermediate value between the upper and lower limits of the ranges is also specifically disclosed. Every smaller range between any stated value or stated range, and any other stated value or intermediate value within the stated range, is also encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.
Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated by reference for the purpose of disclosing and describing the methods and/or materials associated with the documents. In case of conflict with any incorporated document, the present specification will control.
It will be apparent to those skilled in the art that various modifications and variations can be made in the specific embodiments of the invention described herein without departing from the scope or spirit of the invention. Other embodiments will be apparent to those skilled in the art from consideration of the specification of the present invention. The specification and examples are exemplary only.
As used herein, the terms "comprising," "including," "having," "containing," and the like are intended to be inclusive and mean an inclusion, but not limited to.
The raw materials used in the examples of the present invention were all purchased from sources shown in Table 1.
TABLE 1
Example 1 preparation method of lithium slag composite admixture
S1, calcining lithium slag at 900 ℃ for 5 hours, and grinding the lithium slag into 800+/-50 square meters per kg of fineness through an ultrafine pulverizer to prepare lithium slag powder; the surface of the ball was observed to be smooth under a scanning electron microscope, and as shown in fig. 1, the ball forming rate was 75%, and the ball forming rate was measured by: placing a sample to be detected on glass, then placing the glass on an observation table of a microscope for observation, amplifying by 500-800 times, and observing round particles with different sizes in the field of view, wherein the balling rate of the sample to be detected is 75%.
S2, uniformly mixing the lithium slag powder, the precipitated beads, the silica fume and the sodium silicate according to the mass ratio of 4:2:1:0.3, and uniformly stirring to prepare the lithium slag composite admixture.
Example 2 preparation method of lithium slag composite admixture
S1, calcining lithium slag at 900 ℃ for 5 hours, and grinding the lithium slag into 800+/-50 square meters per kg of fineness by a superfine pulverizer, wherein the balling rate is 75%, so as to prepare lithium slag powder;
s2, uniformly mixing the lithium slag powder, the precipitated beads, the silica fume and the sodium silicate according to the mass ratio of 3:3:1:0.2, and uniformly stirring to prepare the lithium slag composite admixture.
Example 3 preparation method of lithium slag composite admixture
S1, calcining lithium slag at 900 ℃ for 5 hours, and grinding the lithium slag into 800+/-50 square meters per kg of fineness by a superfine pulverizer, wherein the balling rate is 75%, so as to prepare lithium slag powder;
s2, uniformly mixing the lithium slag powder, the precipitated beads, the silica fume and the sodium silicate according to the mass ratio of 4:2:0.5:0.2, and uniformly stirring to prepare the lithium slag composite admixture.
Example 4
S1, calcining lithium slag at 900 ℃ for 5 hours, and grinding the lithium slag into 800+/-50 m by using an ultrafine pulverizer 2 The fineness of the powder is/Kg, the balling rate is 75%, and the lithium slag powder is prepared;
s2, uniformly mixing the lithium slag powder, the precipitated beads, the silica fume and the sodium silicate according to the mass ratio of 3.5:2.5:0.7:0.5, and uniformly stirring to prepare the lithium slag composite admixture.
Comparative example 1
The difference from example 3 is that S1 is that after the lithium slag is calcined at 1100℃for 5 hours, it is ground into 800.+ -.50 square meters per kg of fineness by an ultrafine grinder, and the balling rate is 63%.
Comparative example 2
The difference from example 3 is that S1 is that after the lithium slag is calcined at 700 ℃ for 5 hours, the lithium slag is ground into 800+/-50 square meters per kilogram of fineness by an ultrafine grinder, and the balling rate is 55%.
Comparative example 3
The difference from example 3 is only that the mass of sodium silicate in S2 is replaced by sodium hydroxide in the form of a sheet.
Comparative example 4
The difference from example 3 is only that it is ground by means of a micronizer to a fineness of 930 square meters/-kg, the ball forming rate being 60%.
Comparative example 5
The difference from example 3 is only that it is ground to a fineness of 630 square meters per kg by means of a superfine grinding machine, and the rate of granulation is 65%.
Example 5 preparation method of shotcrete
3 parts of the lithium slag composite admixture prepared in the example 1, 17 parts of P.O 42.5.5-grade ordinary Portland cement, 30 parts of artificial sand, 35 parts of stone and water are added, the water-cement ratio is controlled to be 0.38, the mixture is stirred in a concrete mixer for 2 minutes until the mixture is uniform, 0.3 part of the polycarboxylic acid high-performance water reducer is slowly added during stirring, 1.6 parts of the alkali-free accelerator is added after stirring is finished, and the mixture is stirred for 15 seconds, so that the sprayed concrete is prepared.
Example 6 preparation method of shotcrete
3 parts of the lithium slag composite admixture prepared in the example 2, 17 parts of P.O 42.5.5-grade ordinary Portland cement, 30 parts of artificial sand, 35 parts of stone and water are added, the water-cement ratio is controlled to be 0.38, the mixture is stirred in a concrete mixer for 2 minutes until the mixture is uniform, 0.3 part of the polycarboxylic acid high-performance water reducer is slowly added during stirring, 1.6 parts of the alkali-free accelerator is added after stirring is finished, and the mixture is stirred for 15 seconds, so that the sprayed concrete is prepared.
Example 7 preparation method of shotcrete
3 parts of the lithium slag composite admixture prepared in the example 3, 17 parts of P.O 42.5.5-grade ordinary Portland cement, 30 parts of artificial sand, 35 parts of stone and water are added, the water-cement ratio is controlled to be 0.38, the mixture is stirred in a concrete mixer for 2 minutes until the mixture is uniform, 0.3 part of the polycarboxylic acid high-performance water reducer is slowly added during stirring, 1.6 parts of the alkali-free accelerator is added after stirring is finished, and the mixture is stirred for 15 seconds, so that the sprayed concrete is prepared.
Example 8 preparation method of shotcrete
15 parts of the lithium slag composite admixture prepared in the example 3, 20 parts of P.O 42.5.5-grade ordinary Portland cement, 25 parts of artificial sand, 30 parts of cobble and water are added, the water-cement ratio is controlled to be 0.38, the mixture is stirred in a concrete mixer for 2 minutes until the mixture is uniform, 0.53 part of the polycarboxylic acid high-performance water reducer is slowly added during stirring, 2.8 parts of the alkali-free accelerator is added after stirring is finished, and the mixture is stirred for 15 seconds, so that the sprayed concrete is prepared.
Example 9 preparation method of shotcrete
10 parts of the lithium slag composite admixture prepared in the example 3, 15 parts of P.O 42.5.5-grade ordinary Portland cement, 25 parts of artificial sand, 35 parts of stone and water are added, the water-cement ratio is controlled to be 0.38, the mixture is stirred in a concrete mixer for 2 minutes until the mixture is uniform, 0.3 part of the polycarboxylic acid high-performance water reducer is slowly added during stirring, 1.6 parts of the alkali-free accelerator is added after stirring is finished, and the mixture is stirred for 15 seconds, so that the sprayed concrete is prepared.
Comparative example 6 preparation of a general concrete
20 parts of P.O 42.5.5-grade ordinary Portland cement, 30 parts of artificial sand, 35 parts of stones and a controlled water-cement ratio of 0.38 are stirred in a concrete stirrer for 2 minutes until the mixture is uniform, 0.3 part of polycarboxylic acid high-performance water reducer is slowly added during stirring, 1.6 parts of alkali-free accelerator is added after stirring is finished, and stirring is carried out for 15 seconds, so that ordinary concrete is prepared.
Comparative example 7 preparation method of shotcrete
The same as in example 7 was conducted except that the lithium slag composite admixture prepared in example 3 was replaced with the lithium slag composite admixture prepared in comparative example 1.
Comparative example 8 preparation method of shotcrete
The same as in example 7 was conducted except that the lithium slag composite admixture prepared in example 3 was replaced with the lithium slag composite admixture prepared in comparative example 2.
Comparative example 9 preparation method of shotcrete
The same as in example 7 was conducted except that the lithium slag composite admixture prepared in example 3 was replaced with the lithium slag composite admixture prepared in comparative example 3.
Comparative example 10 preparation method of shotcrete
The same as in example 7 was conducted except that the lithium slag composite admixture prepared in example 3 was replaced with the lithium slag composite admixture prepared in comparative example 4.
Comparative example 11 preparation method of shotcrete
The same as in example 7 was conducted except that the lithium slag composite admixture prepared in example 3 was replaced with the lithium slag composite admixture prepared in comparative example 5.
The concrete prepared in examples 5 to 7 and comparative examples 6 to 11 was cured at a constant temperature and humidity (temperature: 20 ℃ C., humidity: 95%) for 28 days, and the compressive strength and the permeation resistance were measured, respectively.
The method for measuring the compressive strength comprises the following steps: the measurement results are shown in Table 2 according to GB/T50081 Standard of test method for mechanical Properties of ordinary concrete.
The impermeability of the concrete is marked by an impermeability grade, which is a standard impermeability reagent in 28d age, is tested according to a specified method, is expressed by the maximum water pressure which can be born when the concrete is impermeable, is divided into P4, P6, P8, P10, P12 and the like, and can resist water pressure of 0.4, 0.6, 0.8, 1.0 and 1.2Mpa respectively for impermeability; the greater the rating, the better the barrier performance. The invention adopts a method for measuring the impervious grade: the test results are shown in Table 2 according to GB/T50082 Standard for test methods for ordinary concrete Long-term Property and durability.
TABLE 2
The frost resistance level of concrete is an important index for measuring the durability of concrete, the frost resistance of concrete is expressed as the frost resistance level, the frost resistance level is determined by adopting a standard test piece of 28d age, after water absorption saturation, the concrete is subjected to repeated freeze thawing cycles, the compression strength is reduced by not more than 25 percent, and the maximum number of freeze thawing cycles which can be born when the mass loss is not more than 5 percent, and GBJ50164-92 divides the concrete into the following frost resistance levels: the nine grades F10, F15, F25, F50, F100, F150, F200, F250, F300, respectively, represent that the concrete can withstand repeated freeze-thaw cycles 10, 15, 25, 50, 100, 150, 200, 250, and 300 times.
Repeated freeze thawing test is carried out by using a standard test piece maintained for 28 days, the frost resistance of the concrete is inspected, and the repeated freeze thawing test method is as follows: the test results are shown in Table 3, as measured in accordance with GB/T50082 Standard test method for the longevity and durability of ordinary concrete.
TABLE 3 Table 3
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (10)
1. The preparation method of the lithium slag composite admixture is characterized in that lithium slag is calcined and ground to obtain lithium slag powder, and the lithium slag powder, the precipitated beads, the silica fume and the sodium silicate are mixed and uniformly stirred to obtain the lithium slag composite admixture.
2. The method of claim 1, wherein the calcination temperature is 900 ℃.
3. The method according to claim 1, wherein the balling rate of the ground lithium slag powder is not less than 70%.
4. The preparation method according to claim 1, wherein the mass ratio of the lithium slag powder, the precipitated beads, the silica fume and the sodium silicate is (3-4) to (2-3) to (0.5-1) to (0.1-0.5).
5. A lithium slag composite admixture produced by the production process of any one of claims 1 to 4.
6. The use of the lithium slag composite admixture according to claim 5 in sprayed concrete, wherein the lithium slag composite admixture is used for partially replacing cement in sprayed concrete raw materials; wherein the substitution rate of the composite admixture to the cement is 14-40%.
7. The sprayed concrete is characterized by comprising the following raw materials in parts by mass: the composite admixture of claim 5, wherein the composite admixture comprises 3-20 parts of cement, 10-30 parts of aggregate, 40-75 parts of water reducer, 0.08-0.6 part of accelerator and 1.0-3.0 parts of accelerator.
8. A shotcrete according to claim 7, wherein said cement is Portland cement; the aggregate comprises fine aggregate and coarse aggregate; the accelerator is an alkali-free accelerator.
9. A shotcrete according to claim 7, wherein said fine aggregate is artificial or natural sand having a particle size of < 4.75mm and said coarse aggregate is stone having a particle size of 5-10 mm.
10. A method for preparing sprayed concrete according to any one of claims 7 to 9, characterized in that cement, aggregate, water and the composite admixture according to claim 5 are mixed and stirred, a water reducing agent is added during stirring, an accelerator is added after stirring is finished, and stirring is continued to be uniform, so as to prepare the sprayed concrete.
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| CN105819727A (en) * | 2016-03-15 | 2016-08-03 | 东南大学 | Composite mineral admixture for concrete |
| KR102037396B1 (en) * | 2019-04-16 | 2019-10-29 | 주식회사 옳담 | Eco-friendly mortar composition for repair comprising multidirectional basalt fiber, kaolin and additive, and method of repairing concrete structures using the same |
| CN111302708A (en) * | 2020-02-27 | 2020-06-19 | 深圳大学 | Comprehensive utilization technology of large-volume lithium slag waste and implementation method thereof |
| CN111732358A (en) * | 2020-06-04 | 2020-10-02 | 淮阴工学院 | Lithium slag-based concrete mineral admixture |
| CN114671644A (en) * | 2022-03-24 | 2022-06-28 | 江苏奥莱特新材料股份有限公司 | High-early-strength low-resilience high-performance shotcrete and preparation method thereof |
| WO2023080428A1 (en) * | 2021-11-08 | 2023-05-11 | 주식회사 실크로드시앤티 | Nanoparticles for early strength development of concrete, composition for forming concrete comprising same, and method for preparing same |
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| CN105819727A (en) * | 2016-03-15 | 2016-08-03 | 东南大学 | Composite mineral admixture for concrete |
| KR102037396B1 (en) * | 2019-04-16 | 2019-10-29 | 주식회사 옳담 | Eco-friendly mortar composition for repair comprising multidirectional basalt fiber, kaolin and additive, and method of repairing concrete structures using the same |
| CN111302708A (en) * | 2020-02-27 | 2020-06-19 | 深圳大学 | Comprehensive utilization technology of large-volume lithium slag waste and implementation method thereof |
| CN111732358A (en) * | 2020-06-04 | 2020-10-02 | 淮阴工学院 | Lithium slag-based concrete mineral admixture |
| WO2023080428A1 (en) * | 2021-11-08 | 2023-05-11 | 주식회사 실크로드시앤티 | Nanoparticles for early strength development of concrete, composition for forming concrete comprising same, and method for preparing same |
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