CN113173732A - Anti-segregation agent for concrete and preparation method and application thereof - Google Patents
Anti-segregation agent for concrete and preparation method and application thereof Download PDFInfo
- Publication number
- CN113173732A CN113173732A CN202110279265.XA CN202110279265A CN113173732A CN 113173732 A CN113173732 A CN 113173732A CN 202110279265 A CN202110279265 A CN 202110279265A CN 113173732 A CN113173732 A CN 113173732A
- Authority
- CN
- China
- Prior art keywords
- concrete
- segregation
- parts
- calcium aluminate
- aminopropylmethyldiethoxysilane
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005204 segregation Methods 0.000 title claims abstract description 39
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- HXLAEGYMDGUSBD-UHFFFAOYSA-N 3-[diethoxy(methyl)silyl]propan-1-amine Chemical compound CCO[Si](C)(OCC)CCCN HXLAEGYMDGUSBD-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 25
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 22
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims abstract description 21
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims abstract description 13
- 239000001768 carboxy methyl cellulose Substances 0.000 claims abstract description 13
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims abstract description 13
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims abstract description 13
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 claims abstract description 13
- 229910052808 lithium carbonate Inorganic materials 0.000 claims abstract description 13
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims abstract description 13
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims abstract description 13
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 239000002202 Polyethylene glycol Substances 0.000 claims description 15
- 229920001223 polyethylene glycol Polymers 0.000 claims description 15
- 238000006243 chemical reaction Methods 0.000 claims description 14
- 239000000843 powder Substances 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 13
- 238000002156 mixing Methods 0.000 claims description 12
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- KKEYFWRCBNTPAC-UHFFFAOYSA-L terephthalate(2-) Chemical compound [O-]C(=O)C1=CC=C(C([O-])=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-L 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- FRIBMENBGGCKPD-UHFFFAOYSA-N 3-(2,3-dimethoxyphenyl)prop-2-enal Chemical compound COC1=CC=CC(C=CC=O)=C1OC FRIBMENBGGCKPD-UHFFFAOYSA-N 0.000 claims description 6
- LGRFSURHDFAFJT-UHFFFAOYSA-N Phthalic anhydride Natural products C1=CC=C2C(=O)OC(=O)C2=C1 LGRFSURHDFAFJT-UHFFFAOYSA-N 0.000 claims description 6
- ZCKPFAYILJKXAT-UHFFFAOYSA-N benzyl benzenecarbodithioate Chemical compound C=1C=CC=CC=1C(=S)SCC1=CC=CC=C1 ZCKPFAYILJKXAT-UHFFFAOYSA-N 0.000 claims description 6
- JHIWVOJDXOSYLW-UHFFFAOYSA-N butyl 2,2-difluorocyclopropane-1-carboxylate Chemical compound CCCCOC(=O)C1CC1(F)F JHIWVOJDXOSYLW-UHFFFAOYSA-N 0.000 claims description 6
- 239000003638 chemical reducing agent Substances 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 238000010992 reflux Methods 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 5
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 claims description 5
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 5
- 235000010265 sodium sulphite Nutrition 0.000 claims description 5
- 239000012295 chemical reaction liquid Substances 0.000 claims description 4
- 239000003999 initiator Substances 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
- 238000000498 ball milling Methods 0.000 claims description 3
- 239000011268 mixed slurry Substances 0.000 claims description 3
- 239000002904 solvent Substances 0.000 claims description 3
- 238000001354 calcination Methods 0.000 claims description 2
- 239000004568 cement Substances 0.000 abstract description 4
- -1 polyethylene terephthalate Polymers 0.000 abstract description 4
- 229920000139 polyethylene terephthalate Polymers 0.000 abstract description 4
- 239000005020 polyethylene terephthalate Substances 0.000 abstract description 4
- 230000000740 bleeding effect Effects 0.000 abstract description 2
- 230000014759 maintenance of location Effects 0.000 abstract description 2
- 238000005086 pumping Methods 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 239000011083 cement mortar Substances 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 241000264877 Hippospongia communis Species 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000002195 synergetic effect Effects 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
-
- 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/2641—Polyacrylates; Polymethacrylates
-
- 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/40—Compounds containing silicon, titanium or zirconium or other organo-metallic compounds; Organo-clays; Organo-inorganic complexes
- C04B24/42—Organo-silicon compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
- C08F283/02—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polycarbonates or saturated polyesters
-
- 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
- C04B2103/0068—Ingredients with a function or property not provided for elsewhere in C04B2103/00
- C04B2103/0082—Segregation-preventing agents; Sedimentation-preventing agents
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention belongs to the technical field of concrete admixtures, and particularly relates to an anti-segregation agent for concrete, and a preparation method and application thereof. The segregation agent is prepared from the following raw materials: acrylic acid, polyethylene terephthalate, hybrid 3-aminopropyl methyl diethoxy silane, carboxymethyl cellulose, polyvinylpyrrolidone, calcium aluminate and lithium carbonate. The segregation-resistant agent provided by the invention is small in addition amount, and the prepared concrete is free from segregation and bleeding and keeps good fluidity, so that the slump retention of the concrete is good, the compressive strength is improved, and the setting time is short; according to the invention, by adding the hybrid 3-aminopropyl methyl diethoxysilane, the compatibility among the raw materials is good, the high temperature resistance of the concrete is improved, meanwhile, the adaptability to the cement is good, and the requirements of the concrete under the conditions of super high-rise pumping, long-distance transportation and high-temperature operation are met.
Description
Technical Field
The invention belongs to the technical field of concrete admixtures, and particularly relates to an anti-segregation agent for concrete, and a preparation method and application thereof.
Background
The concrete segregation is a phenomenon that cohesive force among concrete mixture components is not enough to resist aggregate settlement, and mainly shows that concrete aggregate separation and layered bottom grabbing workability are poor, and the segregation of concrete has multiple hazards: (1) the construction performance is influenced, the phenomena of tank sticking, pipe blockage, guide pipe floating and the like are caused, the construction period is influenced, and the economic benefit is reduced; (2) the phenomena of sand lines, honeycombs, exposed aggregates and the like of the concrete structure are caused, and the apparent image of the concrete structure is influenced; (3) the homogeneity of concrete is poor, and shrinkage cracks are easy to generate; (4) the strength of the concrete is greatly reduced, the performances of impermeability, frost resistance and the like of the concrete are also greatly reduced, rework is easy to cause great economic and reputation losses.
At present, in order to reduce the segregation of concrete to the maximum extent, an anti-segregation agent is added in many cases. The anti-segregation agent has excellent performances of reducing the slump of concrete, improving the anti-segregation performance and the like, but the existing anti-segregation agent on the market can greatly increase the viscosity of the concrete, influence the fluidity of the concrete and prolong the setting time of the concrete.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the segregation-resisting agent for the concrete, which solves the problem of concrete segregation without influencing the concrete performance while not influencing the concrete fluidity.
The invention also provides a preparation method of the anti-segregation agent for concrete.
The invention also provides an application of the anti-segregation agent.
The technical scheme adopted by the invention for realizing the purpose is as follows:
the invention provides an anti-segregation agent for concrete, which is prepared from the following raw materials in parts by weight: 20-30 parts of acrylic acid, 5-8 parts of polyethylene glycol terephthalate, 30-35 parts of hybrid 3-aminopropyl methyl diethoxy silane, 15-18 parts of carboxymethyl cellulose, 0.3-0.5 part of polyvinylpyrrolidone, 0.9-1.2 parts of calcium aluminate and 0.2-0.3 part of lithium carbonate.
The hybrid 3-aminopropyl methyl diethoxy silane used in the invention is prepared by the following method: mixing 3-aminopropyl methyl diethoxy silane and ethylene carbonate, adding phthalic anhydride, heating to 70 ℃, carrying out reflux reaction for 20h, then adding ammonia water and sodium sulfite, heating to 100-120 ℃, carrying out reflux reaction for 40h, then carrying out reduced pressure rotation to remove the solvent, adding clear water, standing, centrifuging, and drying.
Further, the concentration of the 3-aminopropylmethyldiethoxysilane in the ethylene carbonate is 25 mg/mL; the molar ratio of phthalic anhydride to 3-aminopropylmethyldiethoxysilane is 2: 1
Further, the ratio of the ammonia water to the 3-aminopropylmethyldiethoxysilane is 3: 5 (mL/mg); the mass ratio of the sodium sulfite to the 3-aminopropylmethyldiethoxysilane is 0.01: 1.
the invention also provides a preparation method of the anti-segregation agent for concrete, which comprises the following steps:
(1) calcining calcium aluminate, and then grinding by a ball mill to obtain fine powder for later use;
(2) uniformly mixing acrylic acid and polyethylene glycol terephthalate, adding initiators of cumene hydroperoxide and benzyl dithiobenzoate, replacing 2 times with nitrogen, heating to 60 ℃, keeping constant temperature for reaction for 15 hours, and obtaining reaction liquid for later use after the temperature is reduced to normal temperature;
(3) and adding hybrid 3-aminopropyl methyl diethoxy silane, carboxymethyl cellulose, polyethylene glycol and polyvinylpyrrolidone into the reaction solution, uniformly mixing, adding calcined calcium aluminate fine powder and lithium carbonate, and continuously stirring until uniform.
Further, the specific process of the step (1) is as follows: firstly grinding and crushing calcium aluminate, then adding absolute ethyl alcohol accounting for 25% of the mass of the calcium aluminate, adding polyethylene glycol accounting for 0.8% of the total weight of the slurry into the mixed slurry for ball milling for 8 hours, then drying the slurry to obtain powder, and heating the powder to 800-.
Further, in the step (2), the addition amount of the cumene hydroperoxide accounts for 0.08 percent of the weight of the acrylic acid; the benzyl dithiobenzoate was added in an amount of 0.02% by weight based on the weight of acrylic acid.
The invention also provides an application of the segregation-resistant agent in preparation of segregation-resistant concrete.
After the acrylic monomer and the polyethylene glycol terephthalate are subjected to copolymerization reaction, the prepared polymer has acid resistance and alkali resistance and is improved in ageing resistance, the concrete segregation phenomenon is improved under the synergistic effect of the raw materials such as hybridized 3-aminopropyl methyl diethoxy silane, the fluidity and the setting time of the concrete are not influenced, and after the raw materials are compounded, the compatibility is good, and the construction performance and the strength of the concrete are improved.
The invention has the beneficial effects that:
(1) the segregation-resistant agent provided by the invention is small in addition amount, and the prepared concrete is free from segregation and bleeding and keeps good fluidity, so that the slump retention of the concrete is good, the compressive strength is improved, and the setting time is short;
(2) according to the invention, by adding the hybrid 3-aminopropyl methyl diethoxysilane, the compatibility among the raw materials is good, the high temperature resistance of the concrete is improved, meanwhile, the adaptability to the cement is good, and the requirements of the concrete under the conditions of super high-rise pumping, long-distance transportation and high-temperature operation are met.
Detailed Description
The technical solution of the present invention is further explained and illustrated by the following specific examples.
Example 1
An anti-segregation agent for concrete, which comprises the following components in percentage by weight: 28 parts of acrylic acid, 5 parts of polyethylene glycol terephthalate, 35 parts of hybrid 3-aminopropyl methyl diethoxy silane, 16 parts of carboxymethyl cellulose, 0.3 part of polyvinylpyrrolidone, 1 part of calcium aluminate and 0.3 part of lithium carbonate.
The preparation method comprises the following steps:
(1) preparation of hybrid 3-aminopropylmethyldiethoxysilane: 3-aminopropylmethyldiethoxysilane and ethylene carbonate were mixed to form a 25mg/mL mixture, then the ratio of phthalic anhydride: the molar ratio of the 3-aminopropylmethyldiethoxysilane is 2: 1, adding phthalic anhydride, heating to 70 ℃, carrying out reflux reaction for 20h, then adding 3mL of ammonia water and sodium sulfite accounting for 1 percent of the mass of the 3-aminopropylmethyldiethoxysilane into every 5mg of 3-aminopropylmethyldiethoxysilane, heating to 100 ℃ and 120 ℃, carrying out reflux reaction for 40h, then carrying out reduced pressure rotation to remove the solvent, adding clear water, standing, centrifuging and drying;
(2) firstly, grinding and crushing calcium aluminate, adding absolute ethyl alcohol accounting for 25% of the mass of the calcium aluminate, adding polyethylene glycol accounting for 0.8% of the total weight of the slurry into the mixed slurry, carrying out ball milling for 8 hours, then drying the slurry to obtain powder, and heating the powder to 800-;
(3) uniformly mixing acrylic acid and polyethylene glycol terephthalate, adding an initiator cumene hydroperoxide accounting for 0.08 percent of the weight of the acrylic acid and benzyl dithiobenzoate accounting for 0.02 percent of the weight of the acrylic acid, replacing 2 times with nitrogen, then heating to 60 ℃, keeping constant temperature for reaction for 15 hours, and obtaining reaction liquid for later use after the temperature is reduced to the normal temperature;
(3) and adding hybrid 3-aminopropyl methyl diethoxy silane, carboxymethyl cellulose, polyethylene glycol and polyvinylpyrrolidone into the reaction solution, uniformly mixing, adding calcined calcium aluminate fine powder and lithium carbonate, and continuously stirring until uniform.
Example 2
An anti-segregation agent for concrete, which comprises the following components in percentage by weight: 20 parts of acrylic acid, 7 parts of polyethylene terephthalate, 33 parts of hybrid 3-aminopropylmethyldiethoxysilane, 18 parts of carboxymethyl cellulose, 0.4 part of polyvinylpyrrolidone, 0.9 part of calcium aluminate and 0.2 part of lithium carbonate.
The preparation method is the same as example 1.
Example 3
An anti-segregation agent for concrete, which comprises the following components in percentage by weight: 30 parts of acrylic acid, 8 parts of polyethylene terephthalate, 32 parts of hybrid 3-aminopropylmethyldiethoxysilane, 18 parts of carboxymethyl cellulose, 0.5 part of polyvinylpyrrolidone, 1.2 parts of calcium aluminate and 0.3 part of lithium carbonate.
The preparation method is the same as example 1.
Comparative example 1
An anti-segregation agent for concrete, which comprises the following components in percentage by weight: 28 parts of acrylic acid, 5 parts of polyethylene terephthalate, 35 parts of 3-aminopropylmethyldiethoxysilane, 16 parts of carboxymethyl cellulose, 0.3 part of polyvinylpyrrolidone, 1 part of calcium aluminate and 0.3 part of lithium carbonate.
The procedure is essentially the same as in example 1, except that 3-aminopropylmethyldiethoxysilane is not hybridized.
Comparative example 2
An anti-segregation agent for concrete, which comprises the following components in percentage by weight: 30 parts of acrylic acid, 32 parts of hybrid 3-aminopropyl methyl diethoxysilane, 18 parts of carboxymethyl cellulose, 0.5 part of polyvinylpyrrolidone, 1.2 parts of calcium aluminate and 0.3 part of lithium carbonate.
The preparation method comprises the following steps:
steps (1) to (2) were the same as in example 1;
(3) uniformly mixing acrylic acid, adding an initiator cumene hydroperoxide accounting for 0.08 percent of the weight of the acrylic acid and benzyl dithiobenzoate accounting for 0.02 percent of the weight of the acrylic acid, replacing for 2 times by nitrogen, then heating to 60 ℃, keeping constant temperature for reaction for 15 hours, and obtaining reaction liquid for later use after the temperature is reduced to normal temperature;
(3) and adding hybrid 3-aminopropyl methyl diethoxy silane, carboxymethyl cellulose, polyethylene glycol and polyvinylpyrrolidone into the reaction solution, uniformly mixing, adding calcined calcium aluminate fine powder and lithium carbonate, and continuously stirring until uniform.
Comparative example 3
An anti-segregation agent for concrete, which comprises the following components in percentage by weight: 28 parts of acrylic acid, 5 parts of polyethylene glycol terephthalate, 35 parts of hybrid 3-aminopropylmethyldiethoxysilane, 0.3 part of polyvinylpyrrolidone, 1 part of calcium aluminate and 0.3 part of lithium carbonate.
The preparation method is basically the same as that of example 1, and no carboxymethyl cellulose is added in the preparation process.
Effects of the embodiment
The cement mortar test: adding a commercial polycarboxylic acid water reducing agent, wherein the anchoring mixing amount is 0.16 percent, moistening P.O42.5 cement, respectively adding 0.004 percent of the segregation resisting agent prepared in the embodiment and the comparative example, and detecting the fluidity and the workability of the prepared cement mortar under the same condition mixing amount, wherein the specific results are shown in Table 1.
TABLE 1
And (II) concrete labeled by C30 is pumped, cement 235, coal ash 65, mineral powder 35, sand 895, 5-20 stones 965, water 155, segregation agent doping amount per unit volume of broken solid doping amount of 0.004, limestone machine-made sand, fineness modulus of 3.0, mud content of 0.5%, coarse aggregate of 10-15mm continuous graded crushed stone, admixture of mineral powder and polycarboxylic acid water reducer broken solid doping amount of 0.16% are detected according to GB/T50080-2002 and GB/T50081-2002 relevant standards, and specific results are shown in Table 2.
TABLE 2
Claims (8)
1. The anti-segregation agent for concrete is characterized by being prepared from the following raw materials in parts by weight: 20-30 parts of acrylic acid, 5-8 parts of polyethylene glycol terephthalate, 30-35 parts of hybrid 3-aminopropyl methyl diethoxy silane, 15-18 parts of carboxymethyl cellulose, 0.3-0.5 part of polyvinylpyrrolidone, 0.9-1.2 parts of calcium aluminate and 0.2-0.3 part of lithium carbonate.
2. The segregation reducing agent for concrete according to claim 1, wherein the hybrid 3-aminopropylmethyldiethoxysilane is prepared by the following method: mixing 3-aminopropyl methyl diethoxy silane and ethylene carbonate, adding phthalic anhydride, heating to 70 ℃, carrying out reflux reaction for 20h, then adding ammonia water and sodium sulfite, heating to 100-120 ℃, carrying out reflux reaction for 40h, then carrying out reduced pressure rotation to remove the solvent, adding clear water, standing, centrifuging, and drying.
3. The segregation reducing agent for concrete according to claim 2, wherein the concentration of the 3-aminopropylmethyldiethoxysilane in ethylene carbonate is 25 mg/mL; the molar ratio of phthalic anhydride to 3-aminopropylmethyldiethoxysilane is 2: 1.
4. the segregation reducing agent for concrete according to claim 2 or 3, wherein the ratio of the ammonia water to the 3-aminopropylmethyldiethoxysilane is 3: 5 (mL/mg); the mass ratio of the sodium sulfite to the 3-aminopropylmethyldiethoxysilane is 0.01: 1.
5. a method for preparing an anti-segregation agent for concrete according to any one of claims 1 to 4, comprising the steps of:
(1) calcining calcium aluminate, and then grinding by a ball mill to obtain fine powder for later use;
(2) uniformly mixing acrylic acid and polyethylene glycol terephthalate, adding initiators of cumene hydroperoxide and benzyl dithiobenzoate, replacing 2 times with nitrogen, heating to 60 ℃, keeping constant temperature for reaction for 15 hours, and obtaining reaction liquid for later use after the temperature is reduced to normal temperature;
(3) and adding hybrid 3-aminopropyl methyl diethoxy silane, carboxymethyl cellulose, polyethylene glycol and polyvinylpyrrolidone into the reaction solution, uniformly mixing, adding calcined calcium aluminate fine powder and lithium carbonate, and continuously stirring until uniform.
6. The preparation method according to claim 5, wherein the step (1) comprises the following specific steps: firstly grinding and crushing calcium aluminate, then adding absolute ethyl alcohol accounting for 25% of the mass of the calcium aluminate, adding polyethylene glycol accounting for 0.8% of the total weight of the slurry into the mixed slurry for ball milling for 8 hours, then drying the slurry to obtain powder, and heating the powder to 800-.
7. The method according to claim 5, wherein in the step (2), cumene hydroperoxide is added in an amount of 0.08% by weight based on acrylic acid; the benzyl dithiobenzoate was added in an amount of 0.02% by weight based on the weight of acrylic acid.
8. Use of the segregation reducing agent prepared by the method of any one of claims 5 to 7 for preparing segregation-resistant concrete.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110279265.XA CN113173732A (en) | 2021-03-16 | 2021-03-16 | Anti-segregation agent for concrete and preparation method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110279265.XA CN113173732A (en) | 2021-03-16 | 2021-03-16 | Anti-segregation agent for concrete and preparation method and application thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113173732A true CN113173732A (en) | 2021-07-27 |
Family
ID=76922028
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110279265.XA Pending CN113173732A (en) | 2021-03-16 | 2021-03-16 | Anti-segregation agent for concrete and preparation method and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113173732A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113912320A (en) * | 2021-11-30 | 2022-01-11 | 西安同成建筑科技有限责任公司 | Preparation method and application of anti-segregation agent for concrete |
-
2021
- 2021-03-16 CN CN202110279265.XA patent/CN113173732A/en active Pending
Non-Patent Citations (2)
| Title |
|---|
| 韩哲文: "《高分子科学教程 第2版》", 28 February 2011, 华东理工大学出版社 * |
| 黎四芳: "《从乙炔制取精细化学品》", 31 March 2016, 厦门大学出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113912320A (en) * | 2021-11-30 | 2022-01-11 | 西安同成建筑科技有限责任公司 | Preparation method and application of anti-segregation agent for concrete |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109678433B (en) | Ultrahigh-strength self-compacting micro-expansion steel pipe concrete and preparation method thereof | |
| CN108840608B (en) | Anti-freezing concrete and preparation method thereof | |
| CN101830664B (en) | Prestressing anchoring and grouting material additive, as well as preparation method and application thereof | |
| CN103553454A (en) | High performance concrete with steel slag as admixture and aggregate and preparation method thereof | |
| CN111825406A (en) | Phosphogypsum-based self-leveling mortar | |
| CN107793098B (en) | High-fluidity rapid repair mortar | |
| CN107651893B (en) | Radiation-proof decorative cement | |
| CN112341104B (en) | High-performance road rubber concrete and preparation method thereof | |
| CN112194432B (en) | High-dispersion high-adhesion shield grouting material | |
| CN112745464A (en) | Phosphate-containing high-adaptability early-strength polycarboxylate superplasticizer and preparation method and application thereof | |
| KR20220016637A (en) | Concrete composition for revealing early strength | |
| CN113831077B (en) | Adhesive for water-permeable paving material and application thereof | |
| CN113717313B (en) | Carboxylic acid copolymer and preparation method and application thereof | |
| CN113173732A (en) | Anti-segregation agent for concrete and preparation method and application thereof | |
| CN111470812B (en) | C50P10 large-volume concrete for construction of small-inclination elephant trunk of deep foundation pit | |
| CN107628790B (en) | Decorative cement | |
| CN107285718B (en) | Lime-based micro-shrinkage grouting material composition and preparation method thereof | |
| CN110981271B (en) | Special composite anti-cracking agent for ultra-high performance concrete | |
| CN108191346A (en) | A kind of assembled architecture sleeve grouting material | |
| CN116425449A (en) | Mortar additive and application thereof | |
| CN114907089B (en) | Anti-cracking self-leveling material containing silica sol | |
| CN110550883A (en) | Anti-segregation agent for concrete doped with naphthalene water reducer and pumping agent thereof, and preparation method and application thereof | |
| CN111908822B (en) | Slump-retaining concrete synergist and preparation method thereof | |
| CN110922106B (en) | Building waste recycled aggregate masonry mortar and preparation method thereof | |
| CN114804789A (en) | Quick-setting type cement roll anchoring agent and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210727 |
|
| RJ01 | Rejection of invention patent application after publication |