CN117285273A - Soybean wax coated carbide slag micro-expanding agent and preparation method and application thereof - Google Patents
Soybean wax coated carbide slag micro-expanding agent and preparation method and application thereof Download PDFInfo
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- CN117285273A CN117285273A CN202311587105.7A CN202311587105A CN117285273A CN 117285273 A CN117285273 A CN 117285273A CN 202311587105 A CN202311587105 A CN 202311587105A CN 117285273 A CN117285273 A CN 117285273A
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- carbide slag
- soybean wax
- expanding agent
- soybean
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- 244000068988 Glycine max Species 0.000 title claims abstract description 106
- 239000002893 slag Substances 0.000 title claims abstract description 106
- 235000010469 Glycine max Nutrition 0.000 title claims abstract description 105
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 64
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims abstract description 16
- 238000001354 calcination Methods 0.000 claims abstract description 14
- 238000009833 condensation Methods 0.000 claims abstract description 10
- 230000005494 condensation Effects 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 9
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 238000012216 screening Methods 0.000 claims abstract description 6
- 238000000227 grinding Methods 0.000 claims abstract description 5
- 238000003756 stirring Methods 0.000 claims description 33
- 239000000292 calcium oxide Substances 0.000 claims description 22
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 22
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 20
- 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 8
- 239000002245 particle Substances 0.000 claims description 7
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 6
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims description 6
- 229910001948 sodium oxide Inorganic materials 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 230000005484 gravity Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 27
- 239000004568 cement Substances 0.000 abstract description 23
- 230000000694 effects Effects 0.000 abstract description 13
- 239000001993 wax Substances 0.000 description 78
- 238000012360 testing method Methods 0.000 description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 238000005336 cracking Methods 0.000 description 9
- 239000005997 Calcium carbide Substances 0.000 description 8
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 239000002910 solid waste Substances 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 5
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 4
- 239000000920 calcium hydroxide Substances 0.000 description 4
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 4
- 229910052749 magnesium Inorganic materials 0.000 description 4
- 239000011777 magnesium Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000395 magnesium oxide Substances 0.000 description 3
- 239000012188 paraffin wax Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 238000007873 sieving Methods 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical group [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000012782 phase change material Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000012180 soy wax Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 206010053567 Coagulopathies Diseases 0.000 description 1
- 229920000858 Cyclodextrin Polymers 0.000 description 1
- 239000001116 FEMA 4028 Substances 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000002742 anti-folding effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- WHGYBXFWUBPSRW-FOUAGVGXSA-N beta-cyclodextrin Chemical compound OC[C@H]([C@H]([C@@H]([C@H]1O)O)O[C@H]2O[C@@H]([C@@H](O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O3)[C@H](O)[C@H]2O)CO)O[C@@H]1O[C@H]1[C@H](O)[C@@H](O)[C@@H]3O[C@@H]1CO WHGYBXFWUBPSRW-FOUAGVGXSA-N 0.000 description 1
- 235000011175 beta-cyclodextrine Nutrition 0.000 description 1
- 229960004853 betadex Drugs 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 239000013064 chemical raw material Substances 0.000 description 1
- 230000035602 clotting Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229910021389 graphene Inorganic materials 0.000 description 1
- 238000009775 high-speed stirring Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- 239000012074 organic phase Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000005191 phase separation Methods 0.000 description 1
- 239000012165 plant wax Substances 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 230000002335 preservative effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000010942 self-nucleation Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 150000003626 triacylglycerols Chemical group 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000005303 weighing Methods 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
- C04B40/0046—Premixtures of ingredients characterised by their processing, e.g. sequence of mixing the ingredients when preparing the premixtures
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention belongs to the technical field of civil engineering materials, and provides a soybean wax coated carbide slag micro-expanding agent, and a preparation method and application thereof. The soybean wax coated carbide slag micro-expanding agent is prepared from the following raw materials in parts by weight: 30-50 parts of carbide slag and 50-70 parts of soybean wax. The preparation method of the soybean wax coated carbide slag micro-expanding agent comprises the following steps: calcining carbide slag; heating the soybean wax to obtain modified soybean wax; mixing carbide slag and modified soybean wax, and then performing condensation treatment to obtain a carbide slag-molten soybean wax mixed system; and (3) sequentially carrying out standing treatment, crushing grinding and screening treatment on the carbide slag-molten soybean wax mixed system to obtain the carbide slag micro-swelling agent coated with the soybean wax. The soybean wax coated carbide slag micro-expanding agent prepared by the invention has good slow release effect and expansion performance, and can greatly improve the limited expansion rate and the free expansion rate of cement-based materials.
Description
Technical Field
The invention relates to the technical field of civil engineering materials, in particular to a soybean wax coated carbide slag micro-expanding agent, a preparation method and application thereof.
Background
The cement-based material is easy to shrink, so that cracking phenomenon of concrete is caused, the generated cracks can not only cause serious negative influence on the bearing capacity of the concrete structure, but also reduce the durability of the concrete structure, so that the concrete structure enters a maintenance and reinforcement stage prematurely, and even the service life is ended in advance. The expanding agent can effectively solve the problem of shrinkage cracking of concrete in engineering, and the expanding agent is divided into a sulfoaluminate expanding agent, a calcium oxide expanding agent and a magnesium oxide expanding agent in the prior art. Among them, the calcium oxide expanding agent has the advantages of excellent early expansion performance, less water consumption, wide raw material sources and the like, and is most widely applied to concrete, but the calcium oxide expanding agent has high activity, and can generate hydration reaction when contacted with water, and is often consumed in a large amount before the cement is hardened, so the existing calcium oxide expanding agent still has the defects of over-high expansion rate and low effective expansion rate.
In addition, the Chinese patent application with the patent number of CN 116693228A discloses a magnesium slag-based expansion material, a preparation method and application thereof, wherein magnesium slag, metal solid waste, coal-based solid waste, a dispersing agent and an excitation accelerator are respectively activated and uniformly mixed in proportion to obtain the magnesium slag-based expansion material, and the magnesium slag-based expansion material can be used for the construction processes of shrinkage offset, seepage prevention and leakage stoppage and sealing and isolation engineering of concrete, so that the problem of volume shrinkage of a cementing material is solved. However, when the metal solid waste is subjected to activation treatment, the temperature reaches 980 ℃, and harmful gas is generated in the treatment process, so that the environment is polluted.
Chinese patent No. CN 106587714A discloses a concrete anti-cracking impervious agent and a preparation method thereof. The concrete anti-cracking impervious agent disclosed by the invention can improve the anti-folding, tensile and anti-cracking performances of concrete. However, the technology adopts graphene as a raw material, so that the preparation cost of the anti-cracking agent is high, and the technology is not suitable for large-scale application.
Chinese patent application CN 116514444A discloses a micro-expansive agent for concrete and its preparation method. The micro-expansion anti-cracking agent for the concrete comprises fluorogypsum powder, magnesia powder, talcum powder and beta-cyclodextrin, is favorable for improving the anti-cracking performance and the compressive strength of the concrete, but has lower expansion rate and poorer expansion effect after 21 days.
The main component of the calcium carbide is calcium carbide, which is an important chemical raw material and is mainly used for producing acetylene gas. The calcium carbide slag is waste slag which is produced by hydrolyzing calcium carbide by acetylene and takes calcium hydroxide as a main component, and the large-scale accumulation of the calcium carbide slag not only occupies land but also can pollute farmland and water resources, so that the environmental pressure can be effectively relieved when the calcium carbide slag is applied to the field of construction. The main component of the carbide slag is calcium hydroxide, and the carbide slag can be decomposed into calcium oxide at high temperature, so that the preparation of the calcium oxide expanding agent by calcining the carbide slag is feasible. Soy wax is an organic mixture whose main component is triacylglycerides composed of stearic acid. The novel organic phase change material similar to paraffin has the advantages of no toxicity, high phase change latent heat, low melting point, chemical inertness, excellent cycle performance, thermodynamic stability, self-nucleation, no supercooling and phase separation phenomena, and the like, is wide in source and low in price, and is generally applied to the field of wrapping and phase change materials. Based on the background, the soybean wax is used for coating the calcium oxide, so that the hydration of the calcium oxide is delayed, and the economic and environmental benefits are good. Therefore, how to prepare the expanding agent by using the soybean wax becomes a problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the invention provides a soybean wax coated carbide slag micro-expanding agent, and a preparation method and application thereof. The purpose is to solve the problems of the existing calcium oxide expanding agent that the expanding rate is too high and the expanding effect is poor.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the invention provides a soybean wax coated carbide slag micro-expanding agent which is prepared from the following raw materials in parts by weight: 30-50 parts of carbide slag and 50-70 parts of soybean wax;
the carbide slag comprises, by mass, 80-90% of calcium oxide, 5-15% of silicon oxide and 3-7% of sodium oxide.
Further, the particle size of the calcium carbide slag micro-expanding agent wrapped by the soybean wax is 35-100 meshes.
Further, the grain size of the carbide slag is more than or equal to 200 meshes.
Further, the melting point of the soybean wax is 55-62 ℃, and the specific gravity is 0.90-0.99.
The invention provides a preparation method of the soybean wax coated carbide slag micro-expanding agent, which comprises the following steps:
s1, calcining carbide slag;
s2, heating the soybean wax to obtain modified soybean wax;
s3, mixing the carbide slag obtained in the step S1 with the modified soybean wax obtained in the step S2, and then performing condensation treatment to obtain a carbide slag-molten soybean wax mixed system;
s4, sequentially carrying out standing treatment, crushing grinding and screening treatment on the carbide slag-molten soybean wax mixed system to obtain the carbide slag micro-expanding agent coated with the soybean wax;
the step S1 and the step S2 are not limited in sequence.
In the step S1, the temperature of the calcination treatment is 780-1000 ℃, and the time of the calcination treatment is 2-5 hours.
Further, in the step S2, the heating treatment is carried out along with stirring, the stirring is divided into two stages, the rotating speed of the first stage is 300-500 r/min, and the stirring time of the first stage is 50-80S; the rotating speed of the second stage is 600-800 r/min, and the stirring time of the second stage is 100-150 s; the temperature of the heating treatment is 100-150 ℃, and the time of the heating treatment is 10-30 min.
In the step S3, the mixing is performed in a stirring manner, wherein the stirring is divided into two stages, the rotating speed of the first stage is 300-500 r/min, and the stirring time of the first stage is 100-150S; the rotating speed of the second stage is 600-800 r/min, and the stirring time of the second stage is 100-150 s;
the temperature of the condensation treatment is minus 35 to minus 20 ℃, and the time of the condensation treatment is 1 to 2 hours.
Further, in the step S4, the standing treatment is performed for 6-8 hours.
The invention also provides application of the soybean wax coated carbide slag micro-expanding agent in a concrete structure.
Compared with the prior art, the invention has the following beneficial effects:
1. carbide slag as Ca (OH) 2 The calcium oxide is prepared by high-temperature decomposition of industrial byproducts with high content, so that the calcium oxide is used as a raw material of the calcium carbide slag micro-expanding agent wrapped by the soybean wax, the solid waste can be eliminated, the problems of land occupation, environmental pollution and the like of the solid waste can be solved, and the calcium oxide has important significance for recycling the solid waste.
2. The soybean wax is a plant wax extracted from natural plant soybean, is a novel organic phase-change material similar to paraffin, is mainly prepared from petroleum in comparison with paraffin and the like, has the advantages of no pollution, wide source and sustainable development, is more suitable for practical application, and is a novel way for developing and utilizing the soybean wax by applying the soybean wax to the carbide slag micro-expanding agent.
3. The invention uses the carbide slag and the soybean wax to prepare the soybean wax coated carbide slag micro-expanding agent, which can consume solid waste resources and reduce the cost of producing the soybean wax coated carbide slag micro-expanding agent.
4. In the process of preparing the soybean wax coated carbide slag micro-expanding agent, the coating effect of the soybean wax can be improved by improving the technical scheme and the technical parameters, so that the slow release performance of the soybean wax coated carbide slag micro-expanding agent is improved, the time for releasing calcium oxide in the soybean wax coated carbide slag micro-expanding agent is delayed, the cement-based material has good expansion effect in the later period, and the influence of shrinkage cracking in the cement-based material curing process is compensated.
Detailed Description
The invention provides a soybean wax coated carbide slag micro-expanding agent which is prepared from the following raw materials in parts by weight: 30-50 parts of carbide slag and 50-70 parts of soybean wax;
the carbide slag comprises, by mass, 80-90% of calcium oxide, 5-15% of silicon oxide and 3-7% of sodium oxide.
In the present invention, the amount of carbide slag is preferably 35 to 45 parts, more preferably 40 parts.
In the present invention, the amount of soybean wax is 55 to 65 parts, more preferably 60 parts.
In the invention, the content of calcium oxide in carbide slag is preferably 82-88%, the content of silicon oxide is preferably 7-13%, and the content of sodium oxide is preferably 4-6% by mass; the calcium oxide content in the carbide slag is more preferably 84 to 86%, the silicon oxide content is more preferably 9 to 11%, and the sodium oxide content is more preferably 5%.
In the invention, the particle size of the soybean wax coated carbide slag micro-expanding agent is 35-100 meshes, preferably 40-80 meshes, and more preferably 50-70 meshes.
In the invention, the particle size of the carbide slag is not less than 200 meshes, preferably not less than 250 meshes, and more preferably not less than 300 meshes.
In the invention, the melting point of the soybean wax is 55-62 ℃, preferably 56-61 ℃, and more preferably 58-60 ℃; the specific gravity is 0.90 to 0.99, preferably 0.92 to 0.98, and more preferably 0.94 to 0.96.
The invention provides a preparation method of the soybean wax coated carbide slag micro-expanding agent, which comprises the following steps:
s1, calcining carbide slag;
s2, heating the soybean wax to obtain modified soybean wax;
s3, mixing the carbide slag obtained in the step S1 with the modified soybean wax obtained in the step S2, and then performing condensation treatment to obtain a carbide slag-molten soybean wax mixed system;
and S4, sequentially carrying out standing treatment, crushing grinding and screening treatment on the carbide slag-molten soybean wax mixed system to obtain the carbide slag micro-expanding agent coated with the soybean wax.
In the present invention, the step S1 and the step S2 are not limited in sequence.
In the present invention, in the step S1, the temperature of the calcination treatment is 780 to 1000 ℃, preferably 800 to 950 ℃, and more preferably 850 to 900 ℃; the calcination treatment time is 2 to 5 hours, preferably 3 to 4 hours, and more preferably 3.5 hours.
In the present invention, the decomposition of carbide slag is divided into three stages, and the chemically bound water in carbide slag is evaporated before the calcining temperature reaches 430 DEG CThe method comprises the steps of carrying out a first treatment on the surface of the When the calcination temperature reaches 430-520 ℃, decomposing calcium hydroxide in the carbide slag, wherein the reaction equation is as follows: ca (OH) 2 →CaO+H 2 O; when the calcination temperature is 520 ℃ to the final temperature, the decomposition of calcium carbonate in the carbide slag is mainly performed, and the reaction equation is as follows: caCO (CaCO) 3 →CaO+CO 2 。
In the present invention, in the step S2, the heating treatment is performed with stirring, and the stirring is divided into two stages, wherein the rotation speed of the first stage is 300 to 500r/min, preferably 350 to 450r/min, and more preferably 400r/min; the stirring time in the first stage is 50-80 s, preferably 55-70 s, and more preferably 60s; the rotating speed of the second stage is 600-800 r/min, preferably 650-750 r/min, and more preferably 700r/min; the stirring time in the second stage is 100-150 s, preferably 110-140 s, and more preferably 120-130 s; the temperature of the heating treatment is 100-150 ℃, preferably 110-140 ℃, more preferably 120-130 ℃, and the time of the heating treatment is 10-30 min, preferably 15-25 min, more preferably 20min.
In the invention, in the step S3, the mixing is performed in a stirring manner, the stirring is divided into two stages, and the rotation speed of the first stage is 300-500 r/min, preferably 350-450 r/min, and more preferably 400r/min; the stirring time in the first stage is 100-150 s, preferably 110-140 s, and more preferably 120-130 s; the rotating speed of the second stage is 600-800 r/min, preferably 650-750 r/min, and more preferably 700r/min; the stirring time in the second stage is 100 to 150 seconds, preferably 110 to 140 seconds, and more preferably 120 to 130 seconds.
The temperature of the condensation treatment is-35 to-20 ℃, preferably-32 to-25 ℃, and further preferably-30 to-28 ℃; the condensing treatment time is 1-2 h, preferably 1.5h.
In the present invention, in the step S4, the time of the standing treatment is 6 to 8 hours, preferably 6.5 to 7.5 hours, and more preferably 7 hours.
The invention also provides application of the soybean wax coated carbide slag micro-expanding agent in a concrete structure.
The technical solutions provided by the present invention are described in detail below with reference to examples, but they should not be construed as limiting the scope of the present invention.
Example 1
The carbide slag used in this example comprises, by mass, 85% of calcium oxide, 10% of silicon oxide and 5% of sodium oxide.
40 parts of carbide slag and 60 parts of soybean wax are used in the embodiment, and the preparation method comprises the following specific steps:
s1, sieving carbide slag with a 200-mesh square hole sieve, placing the carbide slag in a 105 ℃ oven for drying to constant weight, placing the carbide slag in an aluminum crucible, placing the aluminum crucible in a muffle furnace for heating to 800 ℃ and calcining for 2 hours;
s2, placing the soybean wax in a beaker, opening a constant-temperature water bath kettle, adjusting the temperature to 120 ℃, placing the beaker containing the soybean wax in the constant-temperature water bath kettle, heating for 20min, and carrying out stirring treatment in the heating process until the soybean wax is completely melted;
s3, weighing the carbide slag according to the proportion, slowly adding the carbide slag into the obtained soybean wax, and stirring the mixture by using a handheld stirrer until the carbide slag is uniformly dispersed in the molten soybean wax; then taking out the beaker containing the carbide slag-molten soybean wax mixed system from the constant-temperature water bath, and rapidly sealing the beaker with a preservative film; the temperature of the high-low temperature alternating box is regulated to minus 30 ℃, and then the carbide slag-molten soybean wax mixed system is placed in the high-low temperature alternating box to be condensed for 2 hours;
s4, taking out the condensed carbide slag-molten soybean wax mixed system, standing for 6 hours, and cooling to room temperature; fully grinding and crushing the cooled carbide slag-molten soybean wax mixed system by using a crusher; and (3) screening the crushed solid, and screening powder with the particle size of 35-100 meshes to obtain the soybean wax coated carbide slag micro-expanding agent.
Wherein, the stirring process of the soybean wax in the step S2 comprises two stages: the first stage is low-speed stirring, the rotating speed of the handheld stirrer is adjusted to 400r/min, the stirring time is 60s, the second stage is high-speed stirring, the rotating speed of the handheld stirrer is adjusted to 600r/min, and the stirring time is 120s;
in the step S3, the stirring process of mixing the carbide slag and the soybean wax is divided into two stages, wherein the first stage is to adjust the rotation speed of the handheld stirrer to 400r/min, the stirring time is 120S, and the second stage is to adjust the rotation speed of the handheld stirrer to 600r/min, and the stirring time is 120S.
Example 2
This embodiment differs from embodiment 1 in that: the amount of the carbide slag is 30 parts, the amount of the soybean wax is 70 parts, and the condensing time of the carbide slag-molten soybean wax mixed system in the high-low temperature alternating box is 1h. The remaining steps and parameters were the same as in example 1.
Example 3
This embodiment differs from embodiment 1 in that: the amount of the carbide slag is 30 parts, the amount of the soybean wax is 70 parts, and the sieving particle size of the crushed carbide slag-molten soybean wax mixed system is 50-100 meshes. The remaining steps and parameters were the same as in example 1.
Example 4
This embodiment differs from embodiment 1 in that: the amount of the carbide slag is 50 parts, the amount of the soybean wax is 50 parts, and the condensing time of the carbide slag-molten soybean wax mixed system in the high-low temperature alternating box is 1h. The remaining steps and parameters were the same as in example 1.
Comparative example 1
This embodiment differs from embodiment 1 in that: the carbide slag is 60 parts and the soybean wax is 40 parts. The remaining steps and parameters were the same as in example 1.
Comparative example 2
This embodiment differs from embodiment 1 in that: the amount of carbide slag is 30 parts, the amount of soybean wax is 70 parts, and no condensation treatment is carried out. The remaining steps and parameters were the same as in example 1.
Comparative example 3
This embodiment differs from embodiment 1 in that: the amount of carbide slag is 30 parts, the amount of soybean wax is 70 parts, and the sieving particle size of the crushed carbide slag-molten soybean wax mixed system is more than 100 meshes. The remaining steps and parameters were the same as in example 1.
The time required to reach the peak of the heat release rate, i.e., the peak time, was used to characterize the slow release effect of the soy wax-coated carbide slag micro-expander, and the results are shown in table 1.
Table 1 peak time of arrival of examples 1 to 4 and comparative examples 1 to 3
As can be obtained from table 1, the slow release effect of the soybean wax-coated carbide slag micro-expanding agent prepared within the technical parameter range defined by the invention is better, and the condensing treatment has an accelerating effect on the slow release effect of the soybean wax-coated carbide slag micro-expanding agent.
The soybean wax-coated carbide slag micro-expander of example 4 was applied to cement-based materials, and the mixing ratio design was performed on the expansion test of the soybean wax-coated carbide slag micro-expander cement-based materials according to the test requirements of the concrete expander (GB/T23439-2017) on the expansion test, as shown in Table 2:
TABLE 2 expansion test mix design
Wherein, the cement is P.O42.5 ordinary Portland cement, the initial setting time is 1.77h, the final setting time is 3.77h, and the chemical composition is as follows: caO content 43.89%, siO 2 The content of Al is 28.84 percent 2 O 3 Content of 12.58%, fe 2 O 3 Content of 5.06% SO 3 3.59 percent of MgO, 2.18 percent of Na 2 O content 1.28%, K 2 O content 1.16%, other oxide content 1.42%;
the carbide slag used in the test is sieved by a 200-mesh square hole sieve and is dried to constant weight in a drying oven at 105 ℃; the sand used in the test is ISO standard sand; the water used in the test was laboratory tap water.
The setting time of the cement-based material of the soybean wax-coated carbide slag micro-expander was measured according to the method for testing water consumption, setting time and stability of Cement standard consistence (GB/T1346-2011), and the test results are shown in Table 3.
TABLE 3 clotting time measurement results
Application examples 1-3 are the products of the invention example 4 used as the micro-expanding agent in the cement-based material, and comparative application examples 1-3 are the carbide slag used as the micro-expanding agent in the cement-based material, and the reference group does not add the micro-expanding agent. As can be seen from table 3, according to application examples 1 to 3 and the reference group: the incorporation of the soybean wax-coated carbide slag micro-expanding agent results in a reduction of the initial setting time and the final setting time of the cement-based material, because calcium oxide in the expanding agent reacts with water rapidly to form calcium hydroxide, accelerating the setting of the cement-based material.
According to application examples 1-3 and comparative application examples 1-3, the initial setting time and the final setting time of the cement-based material of the soybean wax-coated carbide slag micro-expanding agent are longer than those of the cement-based material of the carbide slag, which shows that the soybean wax-coated carbide slag micro-expanding agent can delay the setting time of the cement-based material more than that of the carbide slag, and proves that the soybean wax-coated carbide slag micro-expanding agent prepared by the soybean wax has good slow release effect.
The expansion rate of the application example samples was tested according to the cement mortar dry shrinkage test method (JC/T603-2004), and the test results are shown in Table 4:
TABLE 4 expansion ratio test results of Cement-based materials
As can be seen from table 4, according to application examples 1 to 3 and the reference group, the soybean wax-coated carbide slag micro-expanding agent prepared by the invention is doped into the cement-based material, so that the limited expansion rate and the free expansion rate of the cement-based material are greatly improved, and the soybean wax-coated carbide slag micro-expanding agent prepared by the invention has good expansion performance.
According to application examples 1-3 and comparative application examples 1-3, the expansion effect of the cement-based material doped with the soybean wax coated carbide slag micro-expansion agent is better than that of the cement-based material doped with carbide slag, and the improvement of the soybean wax coating technology on the expansion effect of the cement-based material is proved.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (10)
1. The soybean wax coated carbide slag micro-expanding agent is characterized by being prepared from the following raw materials in parts by weight: 30-50 parts of carbide slag and 50-70 parts of soybean wax;
the carbide slag comprises, by mass, 80-90% of calcium oxide, 5-15% of silicon oxide and 3-7% of sodium oxide.
2. The soybean wax-coated carbide slag micro-expanding agent according to claim 1, wherein the particle size of the soybean wax-coated carbide slag micro-expanding agent is 35-100 meshes.
3. The soybean wax coated carbide slag micro-expanding agent according to claim 2, wherein the grain size of the carbide slag is more than or equal to 200 meshes.
4. The soybean wax-coated carbide slag micro-expanding agent according to claim 2 or 3, wherein the soybean wax has a melting point of 55-62 ℃ and a specific gravity of 0.90-0.99.
5. The method for preparing the soybean wax-coated carbide slag micro-expanding agent according to any one of claims 1 to 4, which is characterized by comprising the following steps:
s1, calcining carbide slag;
s2, heating the soybean wax to obtain modified soybean wax;
s3, mixing the carbide slag obtained in the step S1 with the modified soybean wax obtained in the step S2, and then performing condensation treatment to obtain a carbide slag-molten soybean wax mixed system;
s4, sequentially carrying out standing treatment, crushing grinding and screening treatment on the carbide slag-molten soybean wax mixed system to obtain the carbide slag micro-expanding agent coated with the soybean wax;
the step S1 and the step S2 are not limited in sequence.
6. The method according to claim 5, wherein in the step S1, the calcination treatment is performed at 780-1000 ℃ for 2-5 hours.
7. The method according to claim 6, wherein in the step S2, the heating treatment is performed with stirring, the stirring is divided into two stages, the rotation speed of the first stage is 300-500 r/min, and the stirring time of the first stage is 50-80S; the rotating speed of the second stage is 600-800 r/min, and the stirring time of the second stage is 100-150 s; the temperature of the heating treatment is 100-150 ℃, and the time of the heating treatment is 10-30 min.
8. The preparation method according to claim 5, wherein in the step S3, the mixing is performed in a stirring manner, the stirring is divided into two stages, the rotation speed of the first stage is 300-500 r/min, and the stirring time of the first stage is 100-150S; the rotating speed of the second stage is 600-800 r/min, and the stirring time of the second stage is 100-150 s;
the temperature of the condensation treatment is minus 35 to minus 20 ℃, and the time of the condensation treatment is 1 to 2 hours.
9. The preparation method according to claim 8, wherein in the step S4, the time of the standing treatment is 6 to 8 hours.
10. The use of the soybean wax-coated carbide slag micro-expanding agent according to any one of claims 1-4 in concrete structures.
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