CN112876168A - Thin-wall high-pier concrete and preparation method thereof - Google Patents
Thin-wall high-pier concrete and preparation method thereof Download PDFInfo
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- CN112876168A CN112876168A CN202110176407.XA CN202110176407A CN112876168A CN 112876168 A CN112876168 A CN 112876168A CN 202110176407 A CN202110176407 A CN 202110176407A CN 112876168 A CN112876168 A CN 112876168A
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/28—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/32—Polyethers, e.g. alkylphenol polyglycolether
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- 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
- C08F283/06—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals
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- 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
- C08F283/06—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals
- C08F283/065—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals on to unsaturated polyethers, polyoxymethylenes or polyacetals
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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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
- C04B2103/302—Water reducers
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention discloses thin-wall high pier concrete and a preparation method thereof, wherein the thin-wall high pier concrete comprises the following components in parts by weight: cement 320-380 parts; 50-70 parts of fly ash; 1100-1300 parts of coarse aggregate; 700 portions and 730 portions of fine aggregate; 150 portions and 160 portions of water; 2-3 parts of an A-type water reducing agent; 2-3 parts of a B-type water reducing agent; 1-2 parts of a slump retaining agent; 3-5 parts of a polymer A; 4-6 parts of a polymer B. According to the invention, the cement, the fly ash, the coarse aggregate and the fine aggregate are uniformly stirred and mixed according to the above component proportion to obtain a dry material; and then adding water in corresponding parts by weight into the dry materials, stirring and mixing uniformly, then adding an A-type water reducing agent, a B-type water reducing agent, a slump retaining agent, a polymer A and a polymer B in corresponding parts by weight, and continuously mixing uniformly to obtain the thin-wall high-pier concrete. The thin-wall high-pier concrete has good mechanical property, excellent anti-permeability performance and comprehensive crack resistance, and excellent overall performance.
Description
Technical Field
The invention belongs to the technical field of silicate, relates to a concrete preparation technology, and particularly relates to thin-wall high-pier concrete and a preparation method thereof.
Background
Thin-walled high pier concrete bridge structures are often used in plateau areas. In addition, the special high-altitude area has strong sunlight radiation and frequent alternation of dry and wet, and also provides higher requirements and challenges for the design, construction and later maintenance of thin-wall high-pier concrete. In particular, when the extreme low temperature of the plateau area is below-40 ℃, the expansion stress and osmotic pressure are generated in the microstructure in the concrete, and the micro-cracks are generated and developed to crack the concrete structure. Under the environment of humidity with alternate dry and wet, the drying shrinkage deformation of the concrete is large; under the temperature environments of hydration heat effect, solar radiation and strong cooling, the temperature stress of the concrete is large, and in a thin-wall high pier structure, due to the large specific surface area, when the deformation and the stress are restrained, the concrete can generate more and obvious shrinkage cracks and temperature cracks. In addition, the long-term action of the vertical load and the possible vertical uneven settlement of the bridge abutment foundation of the bridge pier can generate additional stress in the structure, and when the ultimate tensile value of the concrete structure is exceeded, the structure can crack; once the thin-wall pier cracks seriously, the durability of the whole bridge and even the running safety are greatly influenced. Therefore, the research on the thin-wall high-pier concrete is very important.
At present, the invention patents related to thin-wall high pier concrete mainly focus on the aspects of construction, maintenance and high pier structure. There is no disclosure of patent for the time being to significantly improve the comprehensive crack resistance of thin-walled high pier concrete from the material preparation perspective. The invention enhances the comprehensive anti-cracking performance of the thin-wall high pier from the material preparation angle, and has certain reference value for the research of the thin-wall high pier in high-cold high-altitude areas and special climatic environments.
Disclosure of Invention
Aiming at the defects of the existing thin-wall high-pier concrete, the invention provides the thin-wall high-pier concrete and the preparation method thereof, and the prepared thin-wall high-pier concrete has good mechanical property, excellent anti-permeability performance and comprehensive crack resistance performance and more excellent overall performance.
In order to solve the above problems, the technical scheme of the invention is as follows:
the thin-wall high-pier concrete is formed by polymerizing the following components in parts by mass:
cement 320-380 parts; 50-70 parts of fly ash; 1100-1300 parts of coarse aggregate; 700 portions and 730 portions of fine aggregate; 150 portions and 160 portions of water; 2-3 parts of an A-type water reducing agent; 2-3 parts of a B-type water reducing agent; 1-2 parts of a slump retaining agent; 3-5 parts of a polymer A; 4-6 parts of a polymer B.
Further, the cement is PO42.5 ordinary portland cement; the fly ash is I-grade fly ash; the coarse aggregate is limestone macadam; the fine aggregate is river sand.
Furthermore, the nominal size fraction of the limestone macadam is 5-25 mm, the particle size of small stones is 5-10 mm, the particle size of large stones is 10-25 mm, and the proportion of the large stones to the small stones is 60:40 by adopting a continuous grading design method.
Furthermore, the fine aggregate is river sand, and the particle grading meets the standard of the I-grade distribution section in the building sand (GB/T14684-.
Further, the preparation method of the A-type water reducing agent comprises the following steps:
(1): adding 16.80 parts of phenolic alcohol head and 0.8 part of boron trifluoride and lithium aluminum hydride with the mass ratio of 1:2.3 into a 5L high-pressure reaction kettle provided with a stirrer and a temperature control device, performing nitrogen replacement for 3 times, vacuumizing to gauge pressure of-0.09 MPa, heating to 125 ℃, dehydrating for 1h, continuing nitrogen replacement, measuring oxygen content, stopping nitrogen replacement after the oxygen content is qualified, cooling to 115 ℃, continuously introducing 61.0 parts of ethylene oxide and 242.1 parts of propylene oxide, controlling the pressure to be less than 0.4MPa, keeping the temperature at 120 ℃ after the nitrogen replacement is finished, aging to negative pressure for 1.8h, cooling, and discharging to obtain finished polyether;
(2): adding the prepared finished polyether into a reaction kettle, heating to 45 ℃ by adopting water bath, and then preserving heat for 0.5 hour. Mixing 6.7 parts by mass of a mixture of 2: 1, ammonium persulfate and azobisisobutyronitrile, wherein the mass ratio of 3.2 parts is 2: 1.3, preparing a solution A from thioglycolic acid, mercaptoethanol and water, preparing a solution B from 5.6 parts by mass of ascorbic acid, sodium formaldehyde sulfoxylate, 33.0 parts of acrylic acid and 0.7 part of phenol alcohol head, and respectively adding the solution A and the solution B into a reaction kettle by using a dropping pump, wherein the solution A is added for 2 hours, and the solution B is added for 1.5 hours; preparing a polyether water reducer, adding 7.3 parts by mass of sodium bicarbonate and triisopropanolamine into the prepared polyether water reducer, and supplementing water to the required solid content to obtain a polyether water reducer solution, namely the A-type water reducer.
Further, the preparation method of the B-type water reducing agent comprises the following steps:
(1): 99.22 parts of 2-methoxy-6-allylphenol and 1.2 parts of sodium hydroxide are added into a high-pressure reaction kettle provided with a stirrer and a temperature control device, after 3 times of nitrogen replacement, vacuumizing is started to gauge pressure of-0.098 MPa, then the temperature is increased to 120 ℃, vacuum dehydration is started for 1.5 hours, then nitrogen replacement is continued, the oxygen content is measured, after the oxygen content is qualified, nitrogen replacement is stopped, and the temperature is reduced to 115 ℃. Introducing a cyclic monomer into the reaction kettle, introducing 83.91 parts of ethylene oxide and 55.42 parts of propylene oxide into the reaction kettle, controlling the pressure to be less than 0.4MPa, carrying out heat preservation and aging at the temperature of 125-140 ℃ to negative pressure after the introduction is finished, cooling and discharging to obtain crude polyether; placing the crude polyether in a reaction kettle, performing nitrogen negative pressure displacement for 3 times, heating to 125 ℃, stirring for 1.7h, cooling to 90 ℃, adding distilled water, stirring for 1h, heating to 120 ℃ while vacuumizing, cooling, and discharging to obtain a finished polyether product;
(2): adding the prepared finished product polyether into a reaction kettle, and heating to 45 ℃ by adopting water bath; preparing a solution A from 5.9 parts of a composition of sodium hydrosulfite and sodium metabisulfite in a mass ratio of 1:1, 9.2 parts of a composition of ammonium persulfate and benzoyl peroxide in a mass ratio of 2:3, 4.3 parts of a composition of thioglycolic acid and mercaptoethanol in a mass ratio of 1:3 and water, preparing a solution B from 158.37 parts of vinylsulfonic acid, 1.0 part of 2-methoxy-6-allylphenol and water, and respectively dropping the solution A and the solution B into a reaction kettle by using a dropping pump, wherein the dropping of the solution A is 1.1 hour, and the dropping of the solution B is 1.7 hours; after the A, B liquid is dripped, preserving heat for 1 hour to prepare the polyether water reducer; and adding 7.8 parts of potassium hydroxide into the prepared polyether water reducer, and supplementing water to the required solid content to obtain a polyether water reducer solution, namely the B-type water reducer.
Further, the slump retaining agent is prepared by the following steps:
(1): adding 18.7-19.2 parts of alcohol head and 0.8-1.5 parts of catalyst into a high-pressure reaction kettle provided with a stirrer and a temperature control device, performing nitrogen replacement for 3 times, vacuumizing to gauge pressure of-0.15 MPa, heating to 130 ℃, and dehydrating for 1-2 hours; introducing 303.7-311.9 parts of cyclic monomer into the reaction kettle, controlling the pressure to be less than 0.5MPa, preserving the temperature and aging at the temperature of 135 plus 140 ℃ to negative pressure after the introduction, cooling and discharging to obtain polyether monomer with molecular weight of about 2000;
(2): adding the prepared finished product polyether into a reaction kettle, and heating to 55-60 ℃ by adopting water bath; preparing liquid A from 4.1-6.7 parts of initiator and water, preparing liquid B from 47.59-48.87 parts of ester, 0.5-1.0 part of alcohol head, 2.4-5.3 parts of reducing agent, 0.5-1.3 parts of chain transfer agent and water, respectively dripping the liquid A and the liquid B into a reaction kettle by using a dripping pump, wherein the liquid A is dripped for 2-3 hours, and the liquid B is dripped for 2-2.5 hours. And (3) after the A, B liquid is dripped, preserving heat for 1 hour to obtain a polyether slump retaining agent, adding 10.2-15.4 parts of neutralizing agent into the prepared polyether slump retaining agent, and replenishing water to the required solid content to obtain the slump retaining agent.
Further, the preparation method of the polymer A is as follows:
(1): adding 18 parts of 2-ethoxy-3-butene-1-ol and 0.8 part of lithium aluminum hydride into a high-pressure reaction kettle provided with a stirrer and a temperature control device, performing nitrogen replacement for 3 times, vacuumizing to gauge pressure of-0.15 MPa, heating to 130 ℃, and dehydrating for 1 h; then introducing 305 parts of propylene oxide into the reaction kettle, controlling the pressure to be less than 0.5MPa, preserving heat and aging at 140 ℃ to negative pressure after introducing, cooling and discharging to obtain polyether monomer with molecular weight of about 2000;
(2): adding the prepared finished product polyether into a reaction kettle, and heating to 55 ℃ by adopting water bath; preparing 3.4 parts of ammonium persulfate and water into solution A, preparing 46.0 parts of diethyl acrylate, 2 parts of 2-ethoxy-3-butene-1-ol, 4.6 parts of sodium bisulfite, 1.2 parts of mercaptopropionic acid and mercaptoacetic acid in a mass ratio of 1:4.2 and water into solution B, and dropwise adding A, B into a reaction kettle by using a dropwise adding pump, wherein the dropwise adding of the solution A is carried out for 3 hours, and the dropwise adding of the solution B is carried out for 2.5 hours; and after the A, B liquid is dripped, preserving the heat for 1 hour, adding 12.4 parts of sodium hydroxide into the prepared polyether slump retaining agent, and replenishing water to the required solid content to obtain the polymer A.
Further, the polymer B is prepared from the solution C and the solution D according to the proportion of 1:1-3:1, and the preparation methods of the two solutions are as follows:
solution C:
(1) adding 25 parts of cyclohexyl-1, 4-dimethanol monovinyl ether into a high-pressure reaction kettle with stirring and temperature control functions, adding 0.10 part of lithium aluminum hydride, then under the stirring, nitrogen is replaced for 4 times, heating is started, the temperature is raised to about 110 ℃, then 80 parts of ethylene oxide is slowly introduced into the reactor for induction reaction, the temperature is gradually raised to about 100-115 ℃ in the induction process, maintaining the constant temperature at 120 deg.C, maintaining the pressure at 0.25MPaG, maintaining the temperature for about 2 hr, when the pressure of the reactor is not reduced any more, adding 0.12 part of potassium hydroxide again, slowly introducing 240 parts of ethylene oxide and 13 parts of difluoromethanesulfonic acid into the container for induction reaction, maintaining the temperature at 125 ℃, when the pressure in the reactor is not reduced any more, reducing the temperature to 80 ℃, vacuumizing and degassing, and discharging to obtain an unsaturated intermediate with the molecular weight of about 400-;
(2) adding the unsaturated intermediate prepared in the step (1) and 350 parts of deionized water into a four-neck flask to serve as a bottom material, adding 120 parts of deionized water into 30 parts of acrylic acid to serve as a material A, adding 4.5 parts of sodium hypophosphite and 50 parts of deionized water into 1.2 parts of mercaptopropionic acid and thioglycollic acid in a mass ratio of 1:2 to prepare a material B, and adding 60 parts of deionized water into 1.2 parts of ammonium persulfate to prepare a material C; heating a water bath kettle to 35 ℃, placing a four-neck flask filled with bottom materials into the water bath kettle, adding 1/3C materials at one time, dropwise adding A materials and B materials at a constant speed, dropwise adding the A materials for 3 hours, dropwise adding the B materials for 3 hours and 10 minutes, adjusting the pH value in the reaction kettle to 5 by using dilute sulfuric acid after the reaction is carried out for 1.2 hours, then adding the rest C materials at one time, adding alkali for neutralization after the A materials and the B materials are dropwise added, supplementing water to the required solid content, curing for 1 hour, naturally cooling to room temperature, and synthesizing a dispersant solution with the mass fraction of about 40%, namely solution C;
solution D
(1) Adding 25 parts of poly (1, 2-propylene glycol) and 0.10 part of lithium aluminum hydride into a high-pressure reaction kettle with stirring and temperature control functions, then under the stirring, nitrogen is replaced for 4 times, heating is started, the temperature is raised to about 120 ℃, then 80 parts of propylene oxide is slowly introduced into the reactor for induction reaction, the temperature is gradually raised to about 110-150 ℃ in the induction process, maintaining the constant temperature at 130 deg.C, maintaining the pressure at 0.25MPaG, maintaining the temperature for about 2 hr, when the pressure of the reactor is not reduced any more, adding 0.12 part of potassium hydroxide again, slowly introducing 240 parts of propylene oxide and 15 parts of sodium 2-propanesulfonate into the container for induction reaction, maintaining the temperature at 135 ℃, when the pressure in the reactor is not reduced any more, reducing the temperature to 110 ℃, vacuumizing and degassing, and discharging to obtain an unsaturated intermediate with the molecular weight of about 400-;
(2) adding the prepared unsaturated intermediate and 220 parts of deionized water into a four-neck flask to serve as a bottom material, adding 50 parts of acrylic acid and 120 parts of deionized water to serve as a material A, adding 1.2 parts of mercaptopropionic acid and thioglycolic acid with the mass ratio of 1:2, 4.5 parts of sodium hypophosphite and 50 parts of deionized water to prepare a material B, and adding 1.2 parts of ammonium persulfate and 60 parts of deionized water to prepare a material C; heating a water bath kettle to 35 ℃, placing a four-neck flask filled with bottom materials into the water bath kettle, adding 1/3C materials at one time, dropwise adding A materials and B materials at a constant speed, dropwise adding the A materials for 3 hours, dropwise adding the B materials for 3 hours and 10 minutes, adjusting the pH value in the reaction kettle to 5 by using dilute sulfuric acid after the reaction is carried out for 1.2 hours, then adding the rest C materials at one time, adding alkali for neutralization after the A materials and the B materials are dropwise added, supplementing water to the required solid content, curing for 1 hour, naturally cooling to room temperature, and synthesizing a polymer solution with the mass fraction of about 40%, namely solution D.
By adopting the technical scheme, the thin-wall high-pier concrete prepared from the cement, the aggregate and the additive has good mechanical property, excellent anti-permeability performance and comprehensive crack resistance, and more excellent overall performance.
The invention also provides a preparation method of the thin-wall high pier concrete, which comprises the following operation steps in sequence:
the method comprises the following steps: uniformly stirring and mixing the cement, the fly ash, the coarse aggregate and the fine aggregate according to the proportion of the components to obtain a dry material;
step two: and adding water in corresponding weight parts into the dry materials, stirring and mixing uniformly, then adding an A-type water reducing agent, a B-type water reducing agent, a slump retaining agent, a polymer A and a polymer B in corresponding weight parts, and continuously mixing uniformly to obtain the thin-wall high-pier concrete.
Compared with the prior art, the invention has the advantages and beneficial effects that:
1. according to the invention, a concrete water reducing agent with high water-retaining property and a polyether water reducing agent with high adaptability are added when the thin-wall high-pier concrete is prepared, so that free water in mortar is retained, the fluidity of the mortar is increased, the hydration process of cement can be delayed, the drying shrinkage of the cement is reduced, and the crack resistance and the working performance of the cement are improved.
2. According to the invention, the super slump retaining post-reinforcing slump retaining agent with short main chain is added during the preparation of the thin-wall high-pier concrete, so that the slump retaining effect is good, and the later strength of the concrete can be improved.
3. The thin-wall high-pier concrete prepared by using the water reducing agent and the slump retaining agent and two polymers with narrow molecular weight distribution ranges has good mechanical properties, excellent anti-permeability performance and comprehensive crack resistance, and relatively excellent overall performance.
Detailed Description
The applicant will further describe the technical solutions and advantages of the present invention in detail with reference to specific examples, but it should be understood that the following examples should not be construed as limiting the scope of the claims of the present application in any way.
The invention provides a formula of thin-wall high-pier concrete, which comprises the following components in parts by mass:
cement 320-380 parts; 50-70 parts of fly ash; 1100-1300 parts of coarse aggregate; 700 portions and 730 portions of fine aggregate; 150 portions and 160 portions of water; 2-3 parts of an A-type water reducing agent; 2-3 parts of a B-type water reducing agent; 1-2 parts of a slump retaining agent; 3-5 parts of a polymer A; 4-6 parts of a polymer B.
The cement is PO42.5 ordinary portland cement; the fly ash is I-grade fly ash; the coarse aggregate is limestone broken stone, the nominal size fraction of the coarse aggregate is 5-25 mm, the particle size of small stones is 5-10 mm, the particle size of large stones is 10-25 mm, a design method of continuous grading is adopted, and the proportion of large stones to small stones is 60: 40; the fine aggregate is river sand, and the particle grading meets the standard of grade I interval in building sand (GB/T14684-2011).
The preparation method of the A-type water reducing agent comprises the following steps:
(1): adding 16.80 parts of phenolic alcohol head and 0.8 part of boron trifluoride and lithium aluminum hydride with the mass ratio of 1:2.3 into a 5L high-pressure reaction kettle provided with a stirrer and a temperature control device, performing nitrogen replacement for 3 times, vacuumizing to gauge pressure of-0.09 MPa, heating to 125 ℃, dehydrating for 1h, continuing nitrogen replacement, measuring oxygen content, stopping nitrogen replacement after the oxygen content is qualified, cooling to 115 ℃, continuously introducing 61.0 parts of ethylene oxide and 242.1 parts of propylene oxide, controlling the pressure to be less than 0.4MPa, keeping the temperature at 120 ℃ after the nitrogen replacement is finished, aging to negative pressure for 1.8h, cooling, and discharging to obtain finished polyether;
(2): adding the prepared finished polyether into a reaction kettle, heating to 45 ℃ by adopting water bath, and then preserving heat for 0.5 hour. Mixing 6.7 parts by mass of a mixture of 2: 1, ammonium persulfate and azobisisobutyronitrile, wherein the mass ratio of 3.2 parts is 2: 1.3, preparing a solution A from thioglycolic acid, mercaptoethanol and water, preparing a solution B from 5.6 parts by mass of ascorbic acid, sodium formaldehyde sulfoxylate, 33.0 parts of acrylic acid and 0.7 part of phenol alcohol head, and respectively adding the solution A and the solution B into a reaction kettle by using a dropping pump, wherein the solution A is added for 2 hours, and the solution B is added for 1.5 hours; preparing a polyether water reducer, adding 7.3 parts by mass of sodium bicarbonate and triisopropanolamine into the prepared polyether water reducer, and supplementing water until the total mass part is 1000 to obtain a polyether water reducer solution, namely the A-type water reducer.
The preparation method of the B-type water reducing agent comprises the following steps:
(1): 99.22 parts of 2-methoxy-6-allylphenol and 1.2 parts of sodium hydroxide are added into a high-pressure reaction kettle provided with a stirrer and a temperature control device, after 3 times of nitrogen replacement, vacuumizing is started to gauge pressure of-0.098 MPa, then the temperature is increased to 120 ℃, vacuum dehydration is started for 1.5 hours, then nitrogen replacement is continued, the oxygen content is measured, after the oxygen content is qualified, nitrogen replacement is stopped, and the temperature is reduced to 115 ℃. Introducing a cyclic monomer into the reaction kettle, introducing 83.91 parts of ethylene oxide and 55.42 parts of propylene oxide into the reaction kettle, controlling the pressure to be less than 0.4MPa, carrying out heat preservation and aging at the temperature of 125-140 ℃ to negative pressure after the introduction is finished, cooling and discharging to obtain crude polyether; placing the crude polyether in a reaction kettle, performing nitrogen negative pressure displacement for 3 times, heating to 125 ℃, stirring for 1.7h, cooling to 90 ℃, adding distilled water, stirring for 1h, heating to 120 ℃ while vacuumizing, cooling, and discharging to obtain a finished polyether product;
(2): adding the prepared finished product polyether into a reaction kettle, and heating to 45 ℃ by adopting water bath; preparing a solution A from 5.9 parts of a composition of sodium hydrosulfite and sodium metabisulfite in a mass ratio of 1:1, 9.2 parts of a composition of ammonium persulfate and benzoyl peroxide in a mass ratio of 2:3, 4.3 parts of a composition of thioglycolic acid and mercaptoethanol in a mass ratio of 1:3 and water, preparing a solution B from 158.37 parts of vinylsulfonic acid, 1.0 part of 2-methoxy-6-allylphenol and water, and respectively dropping the solution A and the solution B into a reaction kettle by using a dropping pump, wherein the dropping of the solution A is 1.1 hour, and the dropping of the solution B is 1.7 hours; after the A, B liquid is dripped, preserving heat for 1 hour to prepare the polyether water reducer; and adding 7.8 parts of potassium hydroxide into the prepared polyether water reducer, and supplementing water until the total mass part is 1000 to obtain a polyether water reducer solution, namely the B-type water reducer.
The slump retaining agent is prepared by the following steps:
1): adding 18.7-19.2 parts of alcohol head and 0.8-1.5 parts of catalyst into a high-pressure reaction kettle provided with a stirrer and a temperature control device, performing nitrogen replacement for 3 times, vacuumizing to gauge pressure of-0.15 MPa, heating to 130 ℃, and dehydrating for 1-2 hours; introducing 303.7-311.9 parts of cyclic monomer into the reaction kettle, controlling the pressure to be less than 0.5MPa, preserving the temperature and aging at the temperature of 135 plus 140 ℃ to negative pressure after the introduction, cooling and discharging to obtain polyether monomer with molecular weight of about 2000;
2): adding the prepared finished product polyether into a reaction kettle, and heating to 55-60 ℃ by adopting water bath; preparing liquid A from 4.1-6.7 parts of initiator and water, preparing liquid B from 47.59-48.87 parts of ester, 0.5-1.0 part of alcohol head, 2.4-5.3 parts of reducing agent, 0.5-1.3 parts of chain transfer agent and water, respectively dripping the liquid A and the liquid B into a reaction kettle by using a dripping pump, wherein the liquid A is dripped for 2-3 hours, and the liquid B is dripped for 2-2.5 hours. And (3) after the A, B liquid is dripped, preserving heat for 1 hour to obtain a polyether slump retaining agent, adding 10.2-15.4 parts of neutralizing agent into the prepared polyether slump retaining agent, and supplementing water until the total mass part is 1000 to obtain the slump retaining agent.
The preparation method of the polymer A is as follows
(1): adding 18 parts of 2-ethoxy-3-butene-1-ol and 0.8 part of lithium aluminum hydride into a high-pressure reaction kettle provided with a stirrer and a temperature control device, performing nitrogen replacement for 3 times, vacuumizing to gauge pressure of-0.15 MPa, heating to 130 ℃, and dehydrating for 1 h; then introducing 305 parts of propylene oxide into the reaction kettle, controlling the pressure to be less than 0.5MPa, preserving heat and aging at 140 ℃ to negative pressure after introducing, cooling and discharging to obtain polyether monomer with molecular weight of about 2000;
(2): adding the prepared finished product polyether into a reaction kettle, and heating to 55 ℃ by adopting water bath; preparing 3.4 parts of ammonium persulfate and water into solution A, preparing 46.0 parts of diethyl acrylate, 2 parts of 2-ethoxy-3-butene-1-ol, 4.6 parts of sodium bisulfite, 1.2 parts of mercaptopropionic acid and mercaptoacetic acid in a mass ratio of 1:4.2 and water into solution B, and dropwise adding A, B into a reaction kettle by using a dropwise adding pump, wherein the dropwise adding of the solution A is carried out for 3 hours, and the dropwise adding of the solution B is carried out for 2.5 hours; and (3) after A, B liquid is dripped, preserving heat for 1 hour, adding 12.4 parts of sodium hydroxide into the prepared polyether slump retaining agent, and supplementing water to 1000 parts by mass to obtain the polymer A.
The polymer B is prepared from a solution C and a solution D according to the proportion of 1:1-3:1, and the preparation methods of the two solutions are as follows:
solution C:
(1) adding 25 parts of cyclohexyl-1, 4-dimethanol monovinyl ether into a high-pressure reaction kettle with stirring and temperature control functions, adding 0.10 part of lithium aluminum hydride, then under the stirring, nitrogen is replaced for 4 times, heating is started, the temperature is raised to about 110 ℃, then 80 parts of ethylene oxide is slowly introduced into the reactor for induction reaction, the temperature is gradually raised to about 100-115 ℃ in the induction process, maintaining the constant temperature at 120 deg.C, maintaining the pressure at 0.25MPaG, maintaining the temperature for about 2 hr, when the pressure of the reactor is not reduced any more, adding 0.12 part of potassium hydroxide again, slowly introducing 240 parts of ethylene oxide and 13 parts of difluoromethanesulfonic acid into the container for induction reaction, maintaining the temperature at 125 ℃, when the pressure in the reactor is not reduced any more, reducing the temperature to 80 ℃, vacuumizing and degassing, and discharging to obtain an unsaturated intermediate with the molecular weight of about 400-;
(2) adding the unsaturated intermediate prepared in the step (1) and 350 parts of deionized water into a four-neck flask to serve as a bottom material, adding 120 parts of deionized water into 30 parts of acrylic acid to serve as a material A, adding 4.5 parts of sodium hypophosphite and 50 parts of deionized water into 1.2 parts of mercaptopropionic acid and thioglycollic acid in a mass ratio of 1:2 to prepare a material B, and adding 60 parts of deionized water into 1.2 parts of ammonium persulfate to prepare a material C; heating a water bath kettle to 35 ℃, placing a four-neck flask filled with bottom materials into the water bath kettle, adding 1/3C materials at one time, dropwise adding A materials and B materials at a constant speed, dropwise adding the A materials for 3 hours, dropwise adding the B materials for 3 hours and 10 minutes, adjusting the pH value in the reaction kettle to 5 by using dilute sulfuric acid after the reaction is carried out for 1.2 hours, then adding the rest C materials at one time, adding alkali for neutralization after the A materials and the B materials are dropwise added, supplementing water to the total mass fraction of 1000, curing for 1 hour, naturally cooling to room temperature, and synthesizing a dispersant solution with the mass fraction of about 40%, namely solution C;
solution D
(1) Adding 25 parts of poly (1, 2-propylene glycol) and 0.10 part of lithium aluminum hydride into a high-pressure reaction kettle with stirring and temperature control functions, then under the stirring, nitrogen is replaced for 4 times, heating is started, the temperature is raised to about 120 ℃, then 80 parts of propylene oxide is slowly introduced into the reactor for induction reaction, the temperature is gradually raised to about 110-150 ℃ in the induction process, maintaining the constant temperature at 130 deg.C, maintaining the pressure at 0.25MPaG, maintaining the temperature for about 2 hr, when the pressure of the reactor is not reduced any more, adding 0.12 part of potassium hydroxide again, slowly introducing 240 parts of propylene oxide and 15 parts of sodium 2-propanesulfonate into the container for induction reaction, maintaining the temperature at 135 ℃, when the pressure in the reactor is not reduced any more, reducing the temperature to 110 ℃, vacuumizing and degassing, and discharging to obtain an unsaturated intermediate with the molecular weight of about 400-;
(2) adding the prepared unsaturated intermediate and 220 parts of deionized water into a four-neck flask to serve as a bottom material, adding 50 parts of acrylic acid and 120 parts of deionized water to serve as a material A, adding 1.2 parts of mercaptopropionic acid and thioglycolic acid with the mass ratio of 1:2, 4.5 parts of sodium hypophosphite and 50 parts of deionized water to prepare a material B, and adding 1.2 parts of ammonium persulfate and 60 parts of deionized water to prepare a material C; heating a water bath kettle to 35 ℃, placing a four-neck flask filled with base materials into the water bath kettle, adding 1/3C materials at one time, dropwise adding A materials and B materials at a constant speed, dropwise adding the A materials for 3 hours, dropwise adding the B materials for 3 hours and 10 minutes, adjusting the pH value in the reaction kettle to 5 by using dilute sulfuric acid after the reaction is carried out for 1.2 hours, then adding the rest C materials at one time, adding alkali for neutralization after the A materials and the B materials are dropwise added, supplementing water to the total mass fraction of 1000, curing for 1 hour, naturally cooling to room temperature, and synthesizing a polymer solution with the mass fraction of about 40%, namely solution D.
Example 1
The thin-wall high-pier concrete comprises the following components in parts by weight as shown in Table 1 and is prepared by the following steps:
the method comprises the following steps: uniformly stirring and mixing the cement, the fly ash, the coarse aggregate and the fine aggregate according to the proportion of the components to obtain a dry material;
step two: adding water in corresponding weight parts into the dry materials, stirring and mixing uniformly, then adding an A-type water reducing agent, a B-type water reducing agent, a slump retaining agent, a polymer A and a polymer B in corresponding weight parts, continuously mixing uniformly to obtain thin-wall high-pier concrete, and pouring and curing the thin-wall high-pier concrete to obtain the thin-wall high-pier concrete member.
Table 1 is a comparative table of the formulation components of examples 1-6 of the present invention
The following table is obtained by detecting the performance of the thin-wall high pier concrete. (28d chloride ion diffusion coefficient is detected according to the standard of GB/T50082-2009, and crack resistance is detected according to the standard of dynamic crack resistance in the JG/T157-2004 industry standard.)
Table 2 shows the concrete properties of the thin-walled high pier of examples 1 to 6 of the present invention
As can be seen from the table, the thin-wall high-pier concrete has good mechanical properties, excellent anti-permeability performance and comprehensive crack resistance, and relatively excellent overall performance.
The above embodiments are merely illustrative of the present invention and are not to be construed as limiting the invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications or equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and the technical solution of the present invention is covered by the claims of the present invention.
Claims (9)
1. The thin-wall high-pier concrete is formed by polymerizing the following components in parts by mass:
cement 320-380 parts; 50-70 parts of fly ash; 1100-1300 parts of coarse aggregate; 700 portions and 730 portions of fine aggregate; 150 portions and 160 portions of water; 2-3 parts of an A-type water reducing agent; 2-3 parts of a B-type water reducing agent; 1-2 parts of a slump retaining agent; 3-5 parts of a polymer A; 4-6 parts of a polymer B.
2. The thin-walled high pier concrete of claim 1, wherein: the cement is PO42.5 ordinary portland cement; the fly ash is I-grade fly ash; the coarse aggregate is limestone macadam; the fine aggregate is river sand.
3. The thin-walled high pier concrete of claim 2, wherein: the nominal size fraction of the limestone macadam is 5-25 mm, the particle size of small stones is 5-10 mm, the particle size of large stones is 10-25 mm, and the proportion of the large stones to the small stones is 60:40 by adopting a continuous grading design method.
4. The thin-walled high pier concrete of claim 1, wherein: the preparation method of the A-type water reducing agent comprises the following steps:
(1): adding 16.80 parts of phenolic alcohol head and 0.8 part of boron trifluoride and lithium aluminum hydride with the mass ratio of 1:2.3 into a 5L high-pressure reaction kettle provided with a stirrer and a temperature control device, performing nitrogen replacement for 3 times, vacuumizing to gauge pressure of-0.09 MPa, heating to 125 ℃, dehydrating for 1h, continuing nitrogen replacement, measuring oxygen content, stopping nitrogen replacement after the oxygen content is qualified, cooling to 115 ℃, continuously introducing 61.0 parts of ethylene oxide and 242.1 parts of propylene oxide, controlling the pressure to be less than 0.4MPa, keeping the temperature at 120 ℃ after the nitrogen replacement is finished, aging to negative pressure for 1.8h, cooling, and discharging to obtain finished polyether;
(2): adding the prepared finished polyether into a reaction kettle, heating to 45 ℃ by adopting water bath, and then preserving heat for 0.5 hour; mixing 6.7 parts by mass of a mixture of 2: 1, ammonium persulfate and azobisisobutyronitrile, wherein the mass ratio of 3.2 parts is 2: 1.3, preparing a solution A from thioglycolic acid, mercaptoethanol and water, preparing a solution B from 5.6 parts by mass of ascorbic acid, sodium formaldehyde sulfoxylate, 33.0 parts of acrylic acid and 0.7 part of phenol alcohol head, and respectively adding the solution A and the solution B into a reaction kettle by using a dropping pump, wherein the solution A is added for 2 hours, and the solution B is added for 1.5 hours; preparing a polyether water reducer, adding 7.3 parts by mass of sodium bicarbonate and triisopropanolamine into the prepared polyether water reducer, and supplementing water to the required solid content to obtain a polyether water reducer solution, namely the A-type water reducer.
5. The thin-walled high pier concrete of claim 1, wherein: the preparation method of the B-type water reducing agent comprises the following steps:
(1): 99.22 parts of 2-methoxy-6-allylphenol and 1.2 parts of sodium hydroxide are added into a high-pressure reaction kettle provided with a stirrer and a temperature control device, after 3 times of nitrogen replacement, vacuumizing is started to gauge pressure of-0.098 MPa, then the temperature is increased to 120 ℃, vacuum dehydration is started for 1.5 hours, then nitrogen replacement is continued, the oxygen content is measured, after the oxygen content is qualified, nitrogen replacement is stopped, and the temperature is reduced to 115 ℃; introducing a cyclic monomer into the reaction kettle, introducing 83.91 parts of ethylene oxide and 55.42 parts of propylene oxide into the reaction kettle, controlling the pressure to be less than 0.4MPa, carrying out heat preservation and aging at the temperature of 125-140 ℃ to negative pressure after the introduction is finished, cooling and discharging to obtain crude polyether; placing the crude polyether in a reaction kettle, performing nitrogen negative pressure displacement for 3 times, heating to 125 ℃, stirring for 1.7h, cooling to 90 ℃, adding distilled water, stirring for 1h, heating to 120 ℃ while vacuumizing, cooling, and discharging to obtain a finished polyether product;
(2): adding the prepared finished product polyether into a reaction kettle, and heating to 45 ℃ by adopting water bath; preparing a solution A from 5.9 parts of a composition of sodium hydrosulfite and sodium metabisulfite in a mass ratio of 1:1, 9.2 parts of a composition of ammonium persulfate and benzoyl peroxide in a mass ratio of 2:3, 4.3 parts of a composition of thioglycolic acid and mercaptoethanol in a mass ratio of 1:3 and water, preparing a solution B from 158.37 parts of vinylsulfonic acid, 1.0 part of 2-methoxy-6-allylphenol and water, and respectively dropping the solution A and the solution B into a reaction kettle by using a dropping pump, wherein the dropping of the solution A is 1.1 hour, and the dropping of the solution B is 1.7 hours; after the A, B liquid is dripped, preserving heat for 1 hour to prepare the polyether water reducer; and adding 7.8 parts of potassium hydroxide into the prepared polyether water reducer, and supplementing water to the required solid content to obtain a polyether water reducer solution, namely the B-type water reducer.
6. The thin-walled high pier concrete of claim 1, wherein: the slump retaining agent is prepared by the following steps:
(1): adding 18.7-19.2 parts of alcohol head and 0.8-1.5 parts of catalyst into a high-pressure reaction kettle provided with a stirrer and a temperature control device, performing nitrogen replacement for 3 times, vacuumizing to gauge pressure of-0.15 MPa, heating to 130 ℃, and dehydrating for 1-2 hours; introducing 303.7-311.9 parts of cyclic monomer into the reaction kettle, controlling the pressure to be less than 0.5MPa, preserving the temperature and aging at the temperature of 135 plus 140 ℃ to negative pressure after the introduction, cooling and discharging to obtain polyether monomer with molecular weight of about 2000;
(2): adding the prepared finished product polyether into a reaction kettle, and heating to 55-60 ℃ by adopting water bath; preparing 4.1-6.7 parts of initiator and water into solution A, preparing 47.59-48.87 parts of ester substances, 0.5-1.0 part of alcohol head, 2.4-5.3 parts of reducing agent, 0.5-1.3 parts of chain transfer agent and water into solution B, respectively dripping solution A and solution B into a reaction kettle by using a dripping pump, wherein the dripping of solution A is carried out for 2-3 hours, and the dripping of solution B is carried out for 2-2.5 hours; and (3) after the A, B liquid is dripped, preserving heat for 1 hour to obtain a polyether slump retaining agent, adding 10.2-15.4 parts of neutralizing agent into the prepared polyether slump retaining agent, and replenishing water to the required solid content to obtain the slump retaining agent.
7. The thin-walled high pier concrete of claim 1, wherein: the preparation method of the polymer A is as follows
(1): adding 18 parts of 2-ethoxy-3-butene-1-ol and 0.8 part of lithium aluminum hydride into a high-pressure reaction kettle provided with a stirrer and a temperature control device, performing nitrogen replacement for 3 times, vacuumizing to gauge pressure of-0.15 MPa, heating to 130 ℃, and dehydrating for 1 h; then introducing 305 parts of propylene oxide into the reaction kettle, controlling the pressure to be less than 0.5MPa, preserving heat and aging at 140 ℃ to negative pressure after introducing, cooling and discharging to obtain polyether monomer with molecular weight of about 2000;
(2): adding the prepared finished product polyether into a reaction kettle, and heating to 55 ℃ by adopting water bath; preparing 3.4 parts of ammonium persulfate and water into solution A, preparing 46.0 parts of diethyl acrylate, 2 parts of 2-ethoxy-3-butene-1-ol, 4.6 parts of sodium bisulfite, 1.2 parts of mercaptopropionic acid and mercaptoacetic acid in a mass ratio of 1:4.2 and water into solution B, and dropwise adding A, B into a reaction kettle by using a dropwise adding pump, wherein the dropwise adding of the solution A is carried out for 3 hours, and the dropwise adding of the solution B is carried out for 2.5 hours; and after the A, B liquid is dripped, preserving the heat for 1 hour, adding 12.4 parts of sodium hydroxide into the prepared polyether slump retaining agent, and replenishing water to the required solid content to obtain the polymer A.
8. The thin-walled high pier concrete of claim 1, wherein: the polymer B is prepared from a solution C and a solution D according to the proportion of 1:1-3:1, and the preparation methods of the two solutions are as follows:
solution C:
(1) adding 25 parts of cyclohexyl-1, 4-dimethanol monovinyl ether into a high-pressure reaction kettle with stirring and temperature control functions, adding 0.10 part of lithium aluminum hydride, then under the stirring, nitrogen is replaced for 4 times, heating is started, the temperature is raised to about 110 ℃, then 80 parts of ethylene oxide is slowly introduced into the reactor for induction reaction, the temperature is gradually raised to about 100-115 ℃ in the induction process, maintaining the constant temperature at 120 deg.C, maintaining the pressure at 0.25MPaG, maintaining the temperature for about 2 hr, when the pressure of the reactor is not reduced any more, adding 0.12 part of potassium hydroxide again, slowly introducing 240 parts of ethylene oxide and 13 parts of difluoromethanesulfonic acid into the container for induction reaction, maintaining the temperature at 125 ℃, when the pressure in the reactor is not reduced any more, reducing the temperature to 80 ℃, vacuumizing and degassing, and discharging to obtain an unsaturated intermediate with the molecular weight of about 400-;
(2) adding the unsaturated intermediate prepared in the step (1) and 350 parts of deionized water into a four-neck flask to serve as a bottom material, adding 120 parts of deionized water into 30 parts of acrylic acid to serve as a material A, adding 4.5 parts of sodium hypophosphite and 50 parts of deionized water into 1.2 parts of mercaptopropionic acid and thioglycollic acid in a mass ratio of 1:2 to prepare a material B, and adding 60 parts of deionized water into 1.2 parts of ammonium persulfate to prepare a material C; heating a water bath kettle to 35 ℃, placing a four-neck flask filled with bottom materials into the water bath kettle, adding 1/3C materials at one time, dropwise adding A materials and B materials at a constant speed, dropwise adding the A materials for 3 hours, dropwise adding the B materials for 3 hours and 10 minutes, adjusting the pH value in the reaction kettle to 5 by using dilute sulfuric acid after the reaction is carried out for 1.2 hours, then adding the rest C materials at one time, adding alkali for neutralization after the A materials and the B materials are dropwise added, supplementing water to the required solid content, curing for 1 hour, naturally cooling to room temperature, and synthesizing a dispersant solution with the mass fraction of about 40%, namely solution C;
solution D
(1) Adding 25 parts of poly (1, 2-propylene glycol) and 0.10 part of lithium aluminum hydride into a high-pressure reaction kettle with stirring and temperature control functions, then under the stirring, nitrogen is replaced for 4 times, heating is started, the temperature is raised to about 120 ℃, then 80 parts of propylene oxide is slowly introduced into the reactor for induction reaction, the temperature is gradually raised to about 110-150 ℃ in the induction process, maintaining the constant temperature at 130 deg.C, maintaining the pressure at 0.25MPaG, maintaining the temperature for about 2 hr, when the pressure of the reactor is not reduced any more, adding 0.12 part of potassium hydroxide again, slowly introducing 240 parts of propylene oxide and 15 parts of sodium 2-propanesulfonate into the container for induction reaction, maintaining the temperature at 135 ℃, when the pressure in the reactor is not reduced any more, reducing the temperature to 110 ℃, vacuumizing and degassing, and discharging to obtain an unsaturated intermediate with the molecular weight of about 400-;
(2) adding the prepared unsaturated intermediate and 220 parts of deionized water into a four-neck flask to serve as a bottom material, adding 50 parts of acrylic acid and 120 parts of deionized water to serve as a material A, adding 1.2 parts of mercaptopropionic acid and thioglycolic acid with the mass ratio of 1:2, 4.5 parts of sodium hypophosphite and 50 parts of deionized water to prepare a material B, and adding 1.2 parts of ammonium persulfate and 60 parts of deionized water to prepare a material C; heating a water bath kettle to 35 ℃, placing a four-neck flask filled with bottom materials into the water bath kettle, adding 1/3C materials at one time, dropwise adding A materials and B materials at a constant speed, dropwise adding the A materials for 3 hours, dropwise adding the B materials for 3 hours and 10 minutes, adjusting the pH value in the reaction kettle to 5 by using dilute sulfuric acid after the reaction is carried out for 1.2 hours, then adding the rest C materials at one time, adding alkali for neutralization after the A materials and the B materials are dropwise added, supplementing water to the required solid content, curing for 1 hour, naturally cooling to room temperature, and synthesizing a polymer solution with the mass fraction of about 40%, namely solution D.
9. A method for preparing the thin-walled high pier concrete according to claim 1, which comprises the following steps in sequence:
the method comprises the following steps: uniformly stirring and mixing the cement, the fly ash, the coarse aggregate and the fine aggregate according to the proportion of the components to obtain a dry material;
step two: and adding water in corresponding weight parts into the dry materials, stirring and mixing uniformly, then adding an A-type water reducing agent, a B-type water reducing agent, a slump retaining agent, a polymer A and a polymer B in corresponding weight parts, and continuously mixing uniformly to obtain the thin-wall high-pier concrete.
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