CN116444189A - Cement ecological high-activity low-carbon admixture and preparation method thereof - Google Patents
Cement ecological high-activity low-carbon admixture and preparation method thereof Download PDFInfo
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- 239000004568 cement Substances 0.000 title claims abstract description 102
- 230000000694 effects Effects 0.000 title claims abstract description 74
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 51
- 238000002360 preparation method Methods 0.000 title abstract description 11
- 239000011083 cement mortar Substances 0.000 claims abstract description 34
- 239000002893 slag Substances 0.000 claims abstract description 23
- 229910052629 lepidolite Inorganic materials 0.000 claims abstract description 18
- 239000002994 raw material Substances 0.000 claims abstract description 15
- 239000010881 fly ash Substances 0.000 claims abstract description 11
- 239000007788 liquid Substances 0.000 claims abstract description 11
- 238000002156 mixing Methods 0.000 claims description 15
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- 239000002440 industrial waste Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- HXKKHQJGJAFBHI-UHFFFAOYSA-N 1-aminopropan-2-ol Chemical compound CC(O)CN HXKKHQJGJAFBHI-UHFFFAOYSA-N 0.000 claims description 3
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 3
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 3
- -1 alcohol amine Chemical class 0.000 claims description 3
- 235000011187 glycerol Nutrition 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 235000013379 molasses Nutrition 0.000 claims description 3
- 238000007873 sieving Methods 0.000 claims description 3
- 239000004567 concrete Substances 0.000 abstract description 10
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 239000000843 powder Substances 0.000 abstract description 6
- 239000004570 mortar (masonry) Substances 0.000 abstract description 4
- 230000002829 reductive effect Effects 0.000 abstract description 4
- 238000012360 testing method Methods 0.000 abstract description 3
- 239000002910 solid waste Substances 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 9
- 238000005034 decoration Methods 0.000 description 7
- 230000036571 hydration Effects 0.000 description 6
- 238000006703 hydration reaction Methods 0.000 description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 5
- 229910052744 lithium Inorganic materials 0.000 description 5
- 239000000523 sample Substances 0.000 description 5
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 description 3
- 238000002441 X-ray diffraction Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000003673 groundwater Substances 0.000 description 2
- 239000005995 Aluminium silicate Substances 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- HCWPIIXVSYCSAN-IGMARMGPSA-N Radium-226 Chemical compound [226Ra] HCWPIIXVSYCSAN-IGMARMGPSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 150000004645 aluminates Chemical class 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033558 biomineral tissue development Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 229910001648 diaspore Inorganic materials 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 229910001653 ettringite Inorganic materials 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 description 1
- 229910052808 lithium carbonate Inorganic materials 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- GCICAPWZNUIIDV-UHFFFAOYSA-N lithium magnesium Chemical compound [Li].[Mg] GCICAPWZNUIIDV-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- ZLMJMSJWJFRBEC-OUBTZVSYSA-N potassium-40 Chemical compound [40K] ZLMJMSJWJFRBEC-OUBTZVSYSA-N 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000013074 reference sample Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000004626 scanning electron microscopy Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- ZSLUVFAKFWKJRC-UHFFFAOYSA-N thorium Chemical compound [Th] ZSLUVFAKFWKJRC-UHFFFAOYSA-N 0.000 description 1
Classifications
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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
- 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
- C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
- C04B18/08—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
- 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
- C04B18/12—Waste materials; Refuse from quarries, mining or the like
-
- 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
- C04B2111/00017—Aspects relating to the protection of the environment
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mining & Mineral Resources (AREA)
- Combustion & Propulsion (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a cement ecological high-activity low-carbon admixture and a preparation method thereof, wherein solid wastes such as fly ash, lepidolite slag and the like are taken as basic raw materials, and a special liquid activity excitant is added. The activity of the cement mortar test block 28d prepared by doping the cement ecological high-activity low-carbon admixture is improved by 7-10% compared with the activity of the standard cement mortar, the compressive strength is excellent, the cement consumption can be reduced, the production cost is obviously reduced, the product performance is improved, and the standard of GB/T18046-2017 granulated blast furnace slag powder for cement, mortar and concrete is met.
Description
The application is a divisional application of 2022, 01 and 18 days, 202210052731.5 and entitled "ecological cement high-activity low-carbon admixture and preparation method thereof".
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a cement ecological high-activity low-carbon admixture and a preparation method thereof.
Background
Lithium and its compounds are widely used in the fields of new energy automobiles, electronic products, energy storage systems, nuclear energy and the like. In recent years, along with the rapid increase of the dosage of lithium ion batteries in electronic equipment and electric automobiles, the capacity of lithium is greatly increased, and the total yield of lithium carbonate in China is about 1.56 ten thousand tons and the total yield of lithium hydroxide is about 8.39 ten thousand tons only from 1 month to 9 months in 2020, and the same ratio is increased by more than 31%. The magnesium-lithium ratio of the salt lake brine in China is extremely high, the natural condition is bad, and the lithium extraction of the salt lake is limited, so that the sources of the lithium are mainly lepidolite and diaspore. The lepidolite ore associated with silver ore suitable for spring is the largest lepidolite ore resource in the world, li 2 The O can be extracted for 110 ten thousand tons and accounts for 30 percent of the national ore reserves, and is an important lithium resource production base in China. SiO in lepidolite slag 2 And Al 2 O 3 The content reaches 70%, and a certain amount of sodium salt and alkali are remained, so that the safety of surrounding environment and groundwater resources is threatened when the environment and the groundwater resources are piled up and buried in the open air, and the method has the significance of protecting the environment and saving the resources for comprehensively utilizing lepidolite slag.
Meanwhile, the cement industry is now the third largest pollution source after the tail gas emission of electric power and motor vehicles in China. In recent years, the haze weather and the cement industry puzzled to our people have certain responsibility, and the cement needs to consume a large amount of fuel and electric energy in the production process, and simultaneously release pollutants such as particles. Therefore, how to reduce the cement consumption to realize carbon emission reduction is also a hot point for future development.
Disclosure of Invention
Based on the problems of the prior art, the invention provides a cement ecological high-activity low-carbon admixture, which is widely applied to P.C32.5-grade cement, improves the workability, the durability and the erosion resistance, reduces the consumption of cement and reduces the production cost.
In order to achieve the purpose, the invention adopts the following technical scheme:
a cement ecological high-activity low-carbon admixture is characterized in that: the admixture is used for replacing part of cement raw materials in cement mortar; the raw materials of the admixture comprise lepidolite slag and fly ash with the mass ratio of 9:1, and the admixture also comprises a liquid activity excitant accounting for 0.1% of the total mass of the cement raw materials and the admixture in the cement mortar; the liquid activity excitant comprises the following raw materials in parts by weight:
further, the cement raw material is P.C32.5 grade cement.
Further, the specific surface areas of the lepidolite slag and the fly ash are not lower than 450m 2 /kg。
Further, the particle size of both the lepidolite residue and the fly ash is not greater than 45 μm.
Further, the blending amount of the admixture accounts for 5-10% of the mass of the cement mortar cement raw material, and is optimally 10%.
The preparation method of the cement ecological high-activity low-carbon admixture comprises the following steps: uniformly mixing water, triethanolamine, diethanol monoisopropanolamine, mixed alcohol amine, molasses and glycerin according to a ratio to obtain a liquid activity excitant; and respectively grinding and sieving lepidolite slag and fly ash, mixing according to a proportion, adding a liquid activity excitant, and uniformly mixing to obtain the cement ecological high-activity low-carbon admixture.
The cement of the invention is ecological, high in activity and low in carbonLepidolite slag in the admixture is industrial waste slag, and the main component SiO in the slag is calcined at 950-1000 DEG C 2 Al and Al 2 O 3 The isolattice is changed from a crystal compact state to an amorphous active state, which is similar to the calcined kaolin, so that the lepidolite slag is an active material and can be used for cement mixed materials, and during the hydration process, the active SiO 2 And Al 2 O 3 Ca (OH) which can be rapidly and precipitated 2 And (3) compounding to generate calcium silicate hydrate and calcium aluminate hydrate cementing materials, so as to accelerate hydration hardening of cement and improve the cement strength. The pulverized fuel ash is finely ground, so that the consumption of cement can be saved, the production cost can be reduced, and the durability of the cement can be improved. The cement ecological high-activity low-carbon admixture meets the GB/T18046-2017 standard of granulated blast furnace slag powder for cement, mortar and concrete, and the invention greatly utilizes industrial waste residues, reduces the cement consumption and achieves the aims of energy conservation and emission reduction.
The invention also discloses cement mortar doped with the cement ecological high-activity low-carbon admixture, which comprises the following preparation method:
uniformly mixing the cement ecological high-activity low-carbon admixture with mixing water and cement to obtain a combined material A; and adding the standard sand into the composite material A and uniformly mixing to obtain the cement mortar of the externally doped cement ecological active low-carbon admixture.
The beneficial effects of the invention are as follows:
1. the preparation method of the cement ecological high-activity low-carbon admixture is simple, easy to operate and simple and cheap in production equipment.
2. The cement ecological high-activity low-carbon admixture is used for replacing cement in cement mortar, can improve the workability of concrete and cement, has the advantages of good fluidity, good water retention, no bleeding, no segregation, small slump loss with time, good pumpability and the like, improves the folding resistance of the cement and the concrete and the wear resistance of the concrete, improves the strength grade of the cement and the concrete, and reduces the dosage of mixing concrete cement.
3. The cement ecological high-activity low-carbon admixture is used for replacing cement in cement mortar, improves the bonding degree of a slurry and an aggregate interface, reduces the pores of hardened cement mortar, improves the structural compactness and the overall stability of the cement ecological high-activity low-carbon admixture, enhances the capability of concrete in resisting various chemical attack and inhibiting alkali aggregate reaction, and remarkably improves the durability of cement stones.
4. The cement ecological high-activity low-carbon admixture can reduce the cement consumption, saves a large amount of cost and has good economic benefit. Meanwhile, the invention recycles solid wastes, has positive promotion effects on protecting environment and saving resources, and has good environmental benefit.
5. The cement ecological high-activity low-carbon admixture of the invention does not cause secondary pollution to the external environment in the preparation process, and accords with the A-class decoration material standard.
6. The cement ecological high-activity low-carbon admixture can also play a role in mineralization, replace partial calcium carbonate, reduce the calcination temperature of cement raw materials, further reduce energy consumption and carbon emission, and realize the aims of low carbon, energy conservation and emission reduction.
Drawings
FIG. 1 is a flow chart of a preparation process of cement mortar of the externally doped cement ecological high-activity low-carbon admixture;
fig. 2 is an SEM picture of cement mortar of the externally doped cement ecological high activity low carbon admixture of the present invention, wherein: (a) cement mortar containing externally doped cement ecological high-activity low-carbon admixture for 3 days of curing, (b) cement mortar without cement ecological high-activity low-carbon admixture for 3 days of curing, (c) cement mortar with cement ecological high-activity low-carbon admixture for 28 days of curing, and (d) cement mortar without cement ecological high-activity low-carbon admixture for 28 days of curing;
FIG. 3 shows XRD patterns of a cement mortar sample with the admixture for cement and a cement mortar sample without the admixture for cement.
Detailed Description
The invention is further described below with reference to the accompanying drawings and examples, which are given for illustrative purposes only and are not intended to limit the invention in any way.
Example 1
The cement ecological high-activity low-carbon admixture is prepared according to the following steps:
uniformly mixing water, triethanolamine, diethanol monoisopropanolamine, mixed alcohol amine, molasses and glycerin according to a mass ratio of 55:5:10:15:5:10 to obtain a liquid activity excitant; respectively grinding and sieving lepidolite slag and fly ash (the specific surface area of the lepidolite slag and the fly ash is 450-500 m) 2 And (3) mixing the materials according to the mass ratio of 9:1, adding a liquid activity excitant, and uniformly mixing to obtain the cement ecological high-activity low-carbon admixture.
The performance index of the admixture used in this example is as follows:
1. fineness of product
Specific surface area of 450-500 m 2 The fineness (45 μm) of the powder is less than 1 percent.
2. Water demand
Because of the filling and dispersing effects of the superfine powder admixture, the porosity of the cementing material system is greatly reduced, and therefore, the water demand of the system is not increased due to the increase of the specific surface area.
3. Analysis of chemical composition
The main chemical components of the cement ecological high-activity low-carbon admixture obtained in the embodiment are shown in the following table:
TABLE 1 major chemical Components of Cement ecological high Activity Low carbon Admixture
The cement ecological high activity low carbon admixture of this example was blended into p.c32.5 grade cement in an amount of 5% of cement, and the activity index of the admixture was measured with reference to the standard of GB/T18046-2017 "granulated blast furnace slag powder for cement, mortar and concrete", and the results are shown in table 2. As can be seen from Table 2, the 3d activity index of the sample doped with the cement ecological high-activity low-carbon admixture is improved by 3%, the 28d activity index is improved by 7%, and the fluidity is also improved by 3mm.
TABLE 2 comparative test of cement mortar doped with cement ecological high activity low carbon admixture and P.C32.5 cement mortar
Example 2
The preparation method of the cement ecological high-activity low-carbon admixture of the embodiment is the same as that of the embodiment 1.
The cement ecological high activity low carbon admixture of this example was blended into p.c32.5 grade cement in an amount of 10% of cement, and the activity index of the admixture was measured with reference to the standard of GB/T18046-2017 "granulated blast furnace slag powder for cement, mortar and concrete", and the results are shown in table 3. As can be seen from Table 3, the 3d activity index of the sample doped with the cement ecological high-activity low-carbon admixture is improved by 5%, the 28d activity index is improved by 10% and the fluidity is also improved by 7mm compared with the reference sample.
TABLE 3 comparative test of cement mortar and P.C32.5 Cement mortar of ecological high-activity low-carbon admixture externally doped with cement
Characterization of the properties:
1. radioactivity research of cement ecological high-activity low-carbon admixture
According to the building material radionuclide limit, GB6556-2010 requires: the specific activity of the radioactivity of natural radionuclides radium-226, thorium-232 and potassium-40 in the A-type decoration material simultaneously satisfies IRa less than or equal to 1.0 and Ir less than or equal to 1.3. The production and marketing and application range of the A-type decorative material are not limited. The material does not meet the requirements of A-type decorative materials but meets the requirements of IRa less than or equal to 1.3 and Ir less than or equal to 1.9 at the same time. The B-type decorative material can not be used for the inner decoration surface of the I-type civil building, but can be used for the inner decoration surface of the II-type civil building, the inner decoration surface of the industrial building and the outer decoration surface of all other buildings. The C-type decorative material does not meet the requirements of A, B-type decorative materials but meets the requirements of Ir which is less than or equal to 2.8. Class C decorative finishing materials are only useful for exterior surfaces of buildings and other outdoor applications.
As shown in table 4, the radioactivity detection result of the cement ecological high-activity low-carbon admixture of the present example satisfies the a-class decoration material.
TABLE 4 radioactivity of cement ecological high activity low carbon admixture compared with GB6556-2010
2. SEM (scanning electron microscope) picture analysis of cement mortar of externally doped cement ecological high-activity low-carbon admixture
SEM analysis was performed on hydration products of samples taken of cement mortar samples of 3d and 28d ages containing 10% admixture and cement mortar samples of 3d and 28d ages without admixture, and the scales of (a), (c) and (d) in fig. 2 were all 2 μm and the scale of (b) was 10 μm as shown in fig. 2.
From fig. 2 (a), it is clearly seen that the uniformly distributed needle-like ettringite develops well and is embedded in the interstices of the set cement, which is a major factor in the early strength of the cement sample. The distribution of the C-S-H gel in FIG. 2 (b) is not apparent, but only a small amount of the network (type II) hydrated C-S-H gel, ca (OH) 2 The shape of the leaf-like C is clear in a flake shape, the number of the leaf-like C is less, the structure is loose, and a large number of unreacted leaf-like C can be seen from the figure 2 S and a small amount of C 3 S is plate-shaped.
It is evident from FIG. 2 (C) that a large number of network-like particles, called type II C-S-H, are in a network structure which is interlocked with each other and develop substantially completely, forming set cement as the main framework, and that hydrated aluminates are seen distributed in the C-S-H gel, and that 28d active substance is fully reacted. In FIG. 2 (d), there is unreacted Ca (OH) 2 And C 2 S, S. The cement ecological high-activity low-carbon admixture has the effect of promoting cement hydration, thereby improving the comprehensive performance of cement-based materials.
3. X-ray diffraction analysis of cement mortar externally doped with cement ecological high-activity low-carbon admixture
Samples of cement mortar at 28d age containing 10% admixture and cement mortar at 28d age without admixture were taken and subjected to X-ray diffraction analysis, and the results are shown in fig. 3. It can be seen that the cement hydration products are composed of CH, C-S-H, AFt and the like, wherein the absorption peaks of CH and C-S-H, AFt in the cement mortar doped with the cement ecological high-activity admixture are stronger, so that the cement ecological high-activity admixture has a promotion effect on cement hydration.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (3)
1. A cement ecological high-activity low-carbon admixture is characterized in that: the admixture is used for replacing part of cement raw materials in cement mortar; the raw materials of the admixture comprise lepidolite slag and fly ash with the mass ratio of 9:1, and the admixture also comprises a liquid activity excitant accounting for 0.1% of the total mass of the cement raw materials and the admixture in the cement mortar; the liquid activity excitant comprises the following raw materials in parts by weight:
the specific surface areas of the lepidolite slag and the fly ash are not less than 450m 2 /kg；
The particle sizes of the lepidolite slag and the fly ash are not more than 45 mu m;
the lepidolite slag is industrial waste slag, and the industrial waste slag comprises SiO 2 And Al 2 O 3 The SiO is 2 And Al 2 O 3 Is in an amorphous state;
the main chemical components and the proportion of the admixture are as follows: caO 15.84%, al 2 O 3 23.07％，SiO 2 40.21％，Fe 2 O 3 2.38％，Cl - 0.030% and SO 3 2.43％。
2. A method for preparing the cement ecological high-activity low-carbon admixture according to claim 1, which is characterized in that: uniformly mixing water, triethanolamine, diethanol monoisopropanolamine, mixed alcohol amine, molasses and glycerin according to a ratio to obtain a liquid activity excitant; and respectively grinding and sieving lepidolite slag and fly ash, mixing according to a proportion, adding a liquid activity excitant, and uniformly mixing to obtain the cement ecological high-activity low-carbon admixture.
3.A cement mortar, characterized in that: the cement mortar is doped with the cement ecological high-activity low-carbon admixture of claim 1 to replace cement raw materials partially; the mixing amount of the admixture accounts for 5-10% of the mass of the cement mortar cement raw material; the cement raw material is P.C32.5 grade cement.
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| CN1226530A (en) * | 1999-03-05 | 1999-08-25 | 张文权 | Lithium dreg concrete |
| CN105439485A (en) * | 2015-12-15 | 2016-03-30 | 华东交通大学 | Lithionite slag admixture and its preparation method and use |
| CN109970369A (en) * | 2019-03-26 | 2019-07-05 | 程菲 | Modified mixed Portland cement of one kind 32.5 and preparation method thereof |
| CN112079589A (en) * | 2020-09-15 | 2020-12-15 | 中建西部建设西南有限公司 | Modified lithium slag complex mineral admixture and preparation and application thereof |
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| CN105271908A (en) * | 2015-09-18 | 2016-01-27 | 广西路佳道桥勘察设计有限公司 | Cement grinding aid and cement |
| CN107188498A (en) * | 2017-07-23 | 2017-09-22 | 四川华西绿舍建材有限公司 | A kind of high-performance lithium slag pump concrete |
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| CN1226530A (en) * | 1999-03-05 | 1999-08-25 | 张文权 | Lithium dreg concrete |
| CN105439485A (en) * | 2015-12-15 | 2016-03-30 | 华东交通大学 | Lithionite slag admixture and its preparation method and use |
| CN109970369A (en) * | 2019-03-26 | 2019-07-05 | 程菲 | Modified mixed Portland cement of one kind 32.5 and preparation method thereof |
| CN112079589A (en) * | 2020-09-15 | 2020-12-15 | 中建西部建设西南有限公司 | Modified lithium slag complex mineral admixture and preparation and application thereof |
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