CN110950553A - Retarded cement and preparation method thereof - Google Patents
Retarded cement and preparation method thereof Download PDFInfo
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- CN110950553A CN110950553A CN201911200982.8A CN201911200982A CN110950553A CN 110950553 A CN110950553 A CN 110950553A CN 201911200982 A CN201911200982 A CN 201911200982A CN 110950553 A CN110950553 A CN 110950553A
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- 239000004568 cement Substances 0.000 title claims abstract description 34
- 238000002360 preparation method Methods 0.000 title abstract description 9
- 239000000843 powder Substances 0.000 claims abstract description 75
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical class O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 claims abstract description 42
- 239000002994 raw material Substances 0.000 claims abstract description 35
- 238000002156 mixing Methods 0.000 claims abstract description 23
- 238000004537 pulping Methods 0.000 claims abstract description 22
- 230000004913 activation Effects 0.000 claims abstract description 20
- 235000019738 Limestone Nutrition 0.000 claims abstract description 19
- 239000003245 coal Substances 0.000 claims abstract description 19
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 19
- 239000006028 limestone Substances 0.000 claims abstract description 19
- 239000011707 mineral Substances 0.000 claims abstract description 19
- 238000007873 sieving Methods 0.000 claims abstract description 18
- 230000000979 retarding effect Effects 0.000 claims abstract description 16
- 238000000227 grinding Methods 0.000 claims abstract description 12
- 239000002002 slurry Substances 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000006243 chemical reaction Methods 0.000 claims abstract description 8
- HCIQUGMKXQZZMG-UHFFFAOYSA-N ethyl hexyl hydrogen phosphate Chemical compound CCCCCCOP(O)(=O)OCC HCIQUGMKXQZZMG-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000012752 auxiliary agent Substances 0.000 claims description 35
- 230000004048 modification Effects 0.000 claims description 19
- 238000012986 modification Methods 0.000 claims description 19
- 150000003863 ammonium salts Chemical class 0.000 claims description 14
- 229920005552 sodium lignosulfonate Polymers 0.000 claims description 14
- WBIQQQGBSDOWNP-UHFFFAOYSA-N 2-dodecylbenzenesulfonic acid Chemical compound CCCCCCCCCCCCC1=CC=CC=C1S(O)(=O)=O WBIQQQGBSDOWNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 238000003672 processing method Methods 0.000 claims description 7
- LMDZBCPBFSXMTL-UHFFFAOYSA-N 1-Ethyl-3-(3-dimethylaminopropyl)carbodiimide Substances CCN=C=NCCCN(C)C LMDZBCPBFSXMTL-UHFFFAOYSA-N 0.000 claims description 6
- FPQQSJJWHUJYPU-UHFFFAOYSA-N 3-(dimethylamino)propyliminomethylidene-ethylazanium;chloride Chemical group Cl.CCN=C=NCCCN(C)C FPQQSJJWHUJYPU-UHFFFAOYSA-N 0.000 claims description 6
- 229940060296 dodecylbenzenesulfonic acid Drugs 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- BTMZHHCFEOXAAN-UHFFFAOYSA-N 2-[bis(2-hydroxyethyl)amino]ethanol;2-dodecylbenzenesulfonic acid Chemical compound OCCN(CCO)CCO.CCCCCCCCCCCCC1=CC=CC=C1S(O)(=O)=O BTMZHHCFEOXAAN-UHFFFAOYSA-N 0.000 claims description 3
- VHGFAEBHLBZCIX-UHFFFAOYSA-N 2-dodecylbenzenesulfonate;2-hydroxyethylazanium Chemical compound NCCO.CCCCCCCCCCCCC1=CC=CC=C1S(O)(=O)=O VHGFAEBHLBZCIX-UHFFFAOYSA-N 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- 239000003973 paint Substances 0.000 claims 2
- YRIUSKIDOIARQF-UHFFFAOYSA-N dodecyl benzenesulfonate Chemical compound CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 YRIUSKIDOIARQF-UHFFFAOYSA-N 0.000 claims 1
- 229940071161 dodecylbenzenesulfonate Drugs 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 7
- 230000003213 activating effect Effects 0.000 abstract description 2
- 238000010276 construction Methods 0.000 description 11
- 239000004567 concrete Substances 0.000 description 9
- 230000036571 hydration Effects 0.000 description 4
- 238000006703 hydration reaction Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000011372 high-strength concrete Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- -1 modified phosphorus compound Chemical class 0.000 description 1
- 239000011178 precast concrete Substances 0.000 description 1
- 239000011513 prestressed concrete Substances 0.000 description 1
- 229940105956 tea-dodecylbenzenesulfonate Drugs 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
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
-
- 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
- C04B7/00—Hydraulic cements
- C04B7/02—Portland cement
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
-
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/20—Retarders
- C04B2103/22—Set retarders
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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 relates to retarding cement and a preparation method thereof, wherein the retarding cement is prepared from the following components in parts by weight: 65-72 parts of clinker aggregate, 8.5-9.2 parts of limestone, 3.5-4.5 parts of coal gangue, 2.5-3.5 parts of sandstone, 8-12 parts of mineral powder, 0-2.4 parts of modified fluorgypsum powder and 2.4-5.5 parts of modified phosphogypsum powder, mixing, grinding and sieving, adding a retarder, and uniformly mixing, wherein the addition amount of the retarder is 0.07-0.09% of the total mass of the raw materials. The inventor of the application finds that the modified fluorgypsum and phosphogypsum have good slow setting effect, particularly, the modified fluorgypsum and phosphogypsum can obviously improve the dispersibility of the slurry, and the ethylhexyl phosphoric acid can improve the wettability of the raw material, promote the raw material to be well mixed with the water for pulping, indirectly improve the viscosity of the slurry, have uniform viscosity and improve the subsequent organic activation efficiency and effect. The activating assistant is added to promote the organic activation reaction, accelerate the organic activation efficiency and improve the organic activation effect.
Description
Technical Field
The invention relates to retarded cement and a preparation method thereof, belonging to the technical field of cement processing.
Background
Because the process time of mixing, paving, compacting and the like in road construction is longer, the initial setting time of cement is generally more than 4 hours and the final setting time is not less than 6 hours according to the construction requirement, the setting time of concrete is delayed according to the construction requirement of a highway base layer, and the construction operation is facilitated and the quality of the base layer is ensured. In addition, in construction seasons usually in spring and summer, the temperature is high, the cement hydration speed is accelerated, the water evaporation is rapid, the concrete slump loss is accelerated, the fluidity is lost rapidly, the construction is difficult or the construction quality of a base layer is influenced, so that the concrete construction is required to have longer working time, and meanwhile, the early cracks of the base layer due to the temperature difference effect can be effectively reduced due to the extension of the concrete setting time.
The in-situ produced ordinary portland cement has the advantages of high setting and hardening speed, high early strength and high later strength, is mainly suitable for in-situ concrete engineering, precast concrete engineering, winter construction concrete engineering, prestressed concrete engineering, high-strength concrete engineering and the like, has high hydration heat, high heat release speed and large heat release amount, and is not suitable for large-volume concrete engineering. Therefore, the setting time of the concrete is delayed through formula adjustment, and the road construction requirement is met.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provide retarded cement.
The invention also aims to solve the defects of the prior art and provide a processing method of retarded cement.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the slow setting cement is prepared from the following components in parts by weight:
65-72 parts of clinker aggregate, 8.5-9.2 parts of limestone, 3.5-4.5 parts of coal gangue, 2.5-3.5 parts of sandstone, 8-12 parts of mineral powder, 0-2.4 parts of modified fluorgypsum powder and 2.4-5.5 parts of modified phosphogypsum powder, mixing, grinding and sieving, adding a retarder, and uniformly mixing, wherein the addition amount of the retarder is 0.07-0.09% of the total mass of the raw materials.
Preferably, the composition is prepared from the following components in parts by weight:
69 parts of clinker, 9.0 parts of limestone, 4.0 parts of coal gangue, 3 parts of sandstone, 10 parts of mineral powder, 2.4 parts of modified fluorgypsum powder, 2.4 parts of modified phosphogypsum powder and 0.08% of retarder by mass of the raw materials.
Preferably, the processing method of the modified fluorgypsum powder and the modified phosphogypsum comprises the following steps:
step S1, crushing the raw materials of fluorgypsum and phosphogypsum to a certain particle size, and respectively adding a certain amount of water and a pulping auxiliary agent to prepare slurry, wherein the pulping auxiliary agent consists of ethylhexyl phosphoric acid and sodium lignosulphonate;
step S2: organic activation, namely respectively adding a certain amount of organic ammonium salt and a certain amount of modification auxiliary agent, and carrying out activation reaction for a certain time, wherein the modification auxiliary agent is 1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride;
step S3: filtering, drying, crushing and sieving to respectively obtain modified fluorgypsum powder and modified phosphogypsum powder.
Preferably, in step S1, the addition amount of the pulping assistant is 3-5% of the mass of the raw material, wherein the content of the sodium lignosulfonate is 35-40%.
Preferably, the addition amount of the pulping auxiliary agent is 4% of the mass of the raw materials, wherein the content of the sodium lignosulfonate is 40%.
Preferably, the organic ammonium salt is any one of the series of organic ammonium salts of dodecylbenzene sulfonic acid.
Preferably, any one or a combination of several of dodecylbenzene sulfonic acid ethanolamine salt, dodecylbenzene sulfonic acid triethanolamine salt, dodecylbenzene sulfonic acid salt and dodecylbenzene sulfonic acid disalt.
Preferably, the addition amount of the modification auxiliary agent is 3-6% of the mass of the raw materials.
Preferably, the addition amount of the modification auxiliary agent is 4% of the mass of the raw materials.
A preparation method of retarded cement comprises the following steps: mixing, grinding and sieving clinker, limestone, coal gangue, sandstone, mineral powder, modified fluorgypsum powder and modified phosphogypsum powder according to the formula ratio, then adding retarder, uniformly mixing, and controlling the specific surface area to be 350 +/-10 m20.08 sieve residue is less than 4.0 per kg.
The invention has the beneficial effects that:
the inventor of the application finds that the modified fluorgypsum and phosphogypsum have good slow setting effect, particularly, the modified fluorgypsum and phosphogypsum can obviously improve the dispersibility of the slurry, and the ethylhexyl phosphoric acid can improve the wettability of the raw material, promote the raw material to be well mixed with the water for pulping, indirectly improve the viscosity of the slurry, have uniform viscosity and improve the subsequent organic activation efficiency and effect. The activating assistant is added to promote the organic activation reaction, accelerate the organic activation efficiency and improve the organic activation effect.
Detailed Description
The technical solution of the present invention will be further specifically described below by way of specific examples.
Example 1:
the slow setting cement is prepared from the following components in parts by weight:
65 parts of clinker, 8.5 parts of limestone, 3.5 parts of coal gangue, 2.5 parts of sandstone, 8 parts of mineral powder, 0 part of modified fluorgypsum powder and 2.4 parts of modified phosphogypsum powder, mixing, grinding and sieving, adding a retarder, and uniformly mixing, wherein the addition amount of the retarder is 0.07 percent of the total mass of the raw materials.
The processing method of the modified fluorgypsum powder and the modified phosphogypsum comprises the following steps:
step S1, crushing the raw materials of fluorgypsum and phosphogypsum to a certain particle size, and respectively adding a certain amount of water and a pulping auxiliary agent to prepare slurry, wherein the pulping auxiliary agent consists of ethylhexyl phosphoric acid and sodium lignosulphonate;
step S2: organic activation, namely respectively adding a certain amount of organic ammonium salt and a certain amount of modification auxiliary agent, and carrying out activation reaction for a certain time, wherein the modification auxiliary agent is 1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride;
step S3: filtering, drying, crushing and sieving to respectively obtain modified fluorgypsum powder and modified phosphogypsum powder, wherein in step S1, the addition amount of the pulping auxiliary agent is 3% of the mass of the raw materials, the content of the sodium lignosulphonate is 30%, the organic ammonium salt is dodecylbenzene sulfonic acid ethanolamine salt, and the addition amount of the modifying auxiliary agent is 3% of the mass of the raw materials.
Example 1 method of preparation of set retarding cement: mixing, grinding and sieving clinker, limestone, coal gangue, sandstone, mineral powder, modified fluorgypsum powder and modified phosphogypsum powder according to the formula ratio, then adding retarder, uniformly mixing, and controlling the specific surface area to be 350 +/-10 m20.08 sieve residue is less than 4.0 per kg.
Example 2
The slow setting cement is prepared from the following components in parts by weight:
72 parts of clinker aggregate, 9.2 parts of limestone, 4.5 parts of coal gangue, 3.5 parts of sandstone, 12 parts of mineral powder, 2.4 parts of modified fluorgypsum powder and 5.5 parts of modified phosphogypsum powder, mixing, grinding and sieving, adding a retarder, and uniformly mixing, wherein the addition amount of the retarder is 0.09 percent of the total mass of the raw materials.
The processing method of the modified fluorgypsum powder and the modified phosphogypsum comprises the following steps:
step S1, crushing the raw materials of fluorgypsum and phosphogypsum to a certain particle size, and respectively adding a certain amount of water and a pulping auxiliary agent to prepare slurry, wherein the pulping auxiliary agent consists of ethylhexyl phosphoric acid and sodium lignosulphonate;
step S2: organic activation, namely respectively adding a certain amount of organic ammonium salt and a certain amount of modification auxiliary agent, and carrying out activation reaction for a certain time, wherein the modification auxiliary agent is 1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride;
step S3: filtering, drying, crushing and sieving to respectively obtain modified fluorgypsum powder and modified phosphogypsum powder, wherein in step S1, the addition amount of the pulping auxiliary agent is 5% of the mass of the raw materials, the content of the sodium lignosulfonate is 35%, the organic ammonium salt is triethanolamine dodecylbenzene sulfonate, and the addition amount of the modifying auxiliary agent is 6% of the mass of the raw materials.
Example 2 method of preparation of set retarding cement: mixing, grinding and sieving clinker, limestone, coal gangue, sandstone, mineral powder, modified fluorgypsum powder and modified phosphogypsum powder according to the formula ratio, then adding retarder, uniformly mixing, and controlling the specific surface area to be 350 +/-10 m20.08 sieve residue is less than 4.0 per kg.
Example 3
The slow setting cement is prepared from the following components in parts by weight:
69 parts of clinker, 9.0 parts of limestone, 4.0 parts of coal gangue, 3 parts of sandstone, 10 parts of mineral powder, 2.4 parts of modified fluorgypsum powder, 2.4 parts of modified phosphogypsum powder and 0.08% of retarder by mass of the raw materials.
The processing method of the modified fluorgypsum powder and the modified phosphogypsum comprises the following steps:
step S1, crushing the raw materials of fluorgypsum and phosphogypsum to a certain particle size, and respectively adding a certain amount of water and a pulping auxiliary agent to prepare slurry, wherein the pulping auxiliary agent consists of ethylhexyl phosphoric acid and sodium lignosulphonate;
step S2: organic activation, namely respectively adding a certain amount of organic ammonium salt and a certain amount of modification auxiliary agent, and carrying out activation reaction for a certain time, wherein the modification auxiliary agent is 1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride;
step S3: filtering, drying, crushing and sieving to respectively obtain modified fluorgypsum powder and modified phosphogypsum powder.
In step S1, the addition amount of the pulping aid is 4% by mass of the raw material, wherein the content of the sodium lignosulfonate is 40%, the organic ammonium salt is dodecyl benzene sulfonic acid disalt, and the addition amount of the modification aid is 4% by mass of the raw material.
Example 3 method of preparation of set retarding cement: mixing, grinding and sieving clinker, limestone, coal gangue, sandstone, mineral powder, modified fluorgypsum powder and modified phosphogypsum powder according to the formula ratio, then adding retarder, uniformly mixing, and controlling the specific surface area to be 350 +/-10 m20.08 sieve residue is less than 4.0 per kg.
Comparative example 1
The cement is prepared from the following components in parts by weight:
69 parts of clinker, 9.0 parts of limestone, 4.0 parts of coal gangue, 3 parts of sandstone, 10 parts of mineral powder, 2.4 parts of fluorgypsum powder and 2.4 parts of phosphogypsum powder, and after being uniformly mixed, a retarder is added, wherein the addition amount of the retarder is 0.08 percent of the total mass of the raw materials.
Mixing the clinker, limestone, coal gangue, sandstone, mineral powder, fluorgypsum powder and phosphogypsum according to the formula ratioMixing, grinding and sieving the powder, adding a retarder, uniformly mixing, and controlling the specific surface area to be 350 +/-10 m20.08 sieve residue is less than 4.0 per kg.
Comparative example 2
The slow setting cement is prepared from the following components in parts by weight:
69 parts of clinker, 9.0 parts of limestone, 4.0 parts of coal gangue, 3 parts of sandstone, 10 parts of mineral powder, 2.4 parts of modified fluorgypsum powder and 2.4 parts of modified phosphogypsum powder.
The processing method of the modified fluorgypsum powder and the modified phosphogypsum comprises the following steps:
step S1, crushing the raw materials of fluorgypsum and phosphogypsum to a certain particle size, and respectively adding a certain amount of water and a pulping auxiliary agent to prepare slurry, wherein the pulping auxiliary agent consists of ethylhexyl phosphoric acid and sodium lignosulphonate;
step S2: organic activation, namely respectively adding a certain amount of organic ammonium salt and a certain amount of modification auxiliary agent, and carrying out activation reaction for a certain time, wherein the modification auxiliary agent is 1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride;
step S3: filtering, drying, crushing and sieving to respectively obtain modified fluorgypsum powder and modified phosphogypsum powder.
In step S1, the addition amount of the pulping aid is 4% by mass of the raw material, wherein the content of the sodium lignosulfonate is 40%, the organic ammonium salt is dodecyl benzene sulfonic acid disalt, and the addition amount of the modification aid is 4% by mass of the raw material.
Example 3 method of preparation of set retarding cement: mixing, grinding and sieving clinker, limestone, coal gangue, sandstone, mineral powder, modified fluorgypsum powder and modified phosphogypsum powder according to the formula ratio, and controlling the specific surface area to be 350 +/-10 m20.08 sieve residue is less than 4.0 per kg.
Comparative example 3
The cement is prepared from the following components in parts by weight:
69 parts of clinker, 9.0 parts of limestone, 4.0 parts of coal gangue, 3 parts of sandstone, 10 parts of mineral powder, 2.4 parts of fluorgypsum powder and 2.4 parts of phosphogypsum powder.
Mixing the clinker, limestone, coal gangue, sandstone, mineral powder, fluorgypsum powder and the like according to the formula ratioMixing, grinding and sieving the phosphogypsum powder, and controlling the specific surface area to be 350 +/-10 m20.08 sieve residue is less than 4.0 per kg.
And (3) test results:
the invention is based on the property that the modified phosphorus compound hinders the hydration and hardening speed of the cement so as to achieve the retarding effect, the modified fluorgypsum, the phosphogypsum and the retarder are added in the production process to prolong the setting time of the cement, thereby being beneficial to construction operation, effectively reducing the early cracks generated by large hydration heat and ensuring the quality of the concrete.
The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit of the invention as set forth in the claims.
Claims (10)
1. The slow setting cement is characterized in that: the paint is prepared from the following components in parts by weight:
65-72 parts of clinker aggregate, 8.5-9.2 parts of limestone, 3.5-4.5 parts of coal gangue, 2.5-3.5 parts of sandstone, 8-12 parts of mineral powder, 0-2.4 parts of modified fluorgypsum powder and 2.4-5.5 parts of modified phosphogypsum powder, mixing, grinding and sieving, adding a retarder, and uniformly mixing, wherein the addition amount of the retarder is 0.07-0.09% of the total mass of the raw materials.
2. The set retarding cement of claim 1, characterized in that: the paint is prepared from the following components in parts by weight:
69 parts of clinker, 9.0 parts of limestone, 4.0 parts of coal gangue, 3 parts of sandstone, 10 parts of mineral powder, 2.4 parts of modified fluorgypsum powder, 2.4 parts of modified phosphogypsum powder and 0.08% of retarder by mass of the raw materials.
3. The set retarding cement of claim 1, characterized in that: the processing method of the modified fluorgypsum powder and the modified phosphogypsum comprises the following steps:
step S1, crushing the raw materials of fluorgypsum and phosphogypsum to a certain particle size, and respectively adding a certain amount of water and a pulping auxiliary agent to prepare slurry, wherein the pulping auxiliary agent consists of ethylhexyl phosphoric acid and sodium lignosulphonate;
step S2: organic activation, namely respectively adding a certain amount of organic ammonium salt and a certain amount of modification auxiliary agent, and carrying out activation reaction for a certain time, wherein the modification auxiliary agent is 1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride;
step S3: filtering, drying, crushing and sieving to respectively obtain modified fluorgypsum powder and modified phosphogypsum powder.
4. The set retarding cement of claim 1, characterized in that: in step S1, the addition amount of the pulping auxiliary agent is 3-5% of the mass of the raw material, wherein the content of the sodium lignosulfonate is 35-40%.
5. The set retarding cement of claim 4, characterized in that: the addition amount of the pulping auxiliary agent is 4% of the mass of the raw materials, wherein the content of the sodium lignosulphonate is 40%.
6. The set retarding cement of claim 1, characterized in that: the organic ammonium salt is any one of dodecyl benzene sulfonic acid organic ammonium salt series.
7. The set retarding cement of claim 6, characterized in that: any one or combination of several of dodecylbenzene sulfonic acid ethanolamine salt, dodecylbenzene sulfonic acid triethanolamine salt, dodecylbenzene sulfonate and dodecylbenzene sulfonic acid disalt.
8. The set retarding cement of claim 1, characterized in that: the addition amount of the modification auxiliary agent is 3-6% of the mass of the raw materials.
9. The set retarding cement of claim 8, characterized in that: the addition amount of the modification auxiliary agent is 4% of the mass of the raw materials.
10. A method of preparing the set retarding cement of any one of claims 1 to 9: the method is characterized in that clinker, limestone, coal gangue, sandstone, mineral powder, modified fluorgypsum powder and modified phosphogypsum powder with formula amount are mixed, milled and sieved, then retarder is added, and the mixture is uniformly mixed, and the specific surface area is controlled to be 350 +/-10 m20.08 sieve residue is less than 4.0 per kg.
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| CN201911200982.8A CN110950553A (en) | 2019-11-29 | 2019-11-29 | Retarded cement and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911200982.8A CN110950553A (en) | 2019-11-29 | 2019-11-29 | Retarded cement and preparation method thereof |
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| CN110950553A true CN110950553A (en) | 2020-04-03 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112194390A (en) * | 2020-09-07 | 2021-01-08 | 黄山精强建材股份有限公司 | Production method of retarded cement |
| CN112456827A (en) * | 2020-11-30 | 2021-03-09 | 中国葛洲坝集团水泥有限公司 | Road base retarding cement and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101164954A (en) * | 2007-09-25 | 2008-04-23 | 中国水利水电第十四工程局 | Method for preparing phosphogypsum retardation setting high efficiency water reducing agent |
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| CN112456827A (en) * | 2020-11-30 | 2021-03-09 | 中国葛洲坝集团水泥有限公司 | Road base retarding cement and preparation method thereof |
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