CN108675672B - Concrete applied to alpine and high-altitude areas, air entraining agent and preparation method - Google Patents
Concrete applied to alpine and high-altitude areas, air entraining agent and preparation method Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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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
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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
- C04B2103/304—Air-entrainers
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/76—Use at unusual temperatures, e.g. sub-zero
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Abstract
The invention provides concrete and an air entraining agent applied to alpine and high-altitude areas and a preparation method thereof, wherein the concrete and the air entraining agent are prepared from the following raw materials: the triterpenoid saponin solution accounts for 92-95 percent, the modified polybutadiene resin accounts for 1.8-2.8 percent, the modified polyacrylamide accounts for 0.7-0.95 percent, the sodium carbonate accounts for 2.5-4.25 percent, and the sum of the weight parts of the raw materials is 100 percent. Compared with the conventional triterpenoid saponin air entraining agent, the air entraining agent disclosed by the invention is added with water-soluble resin modified polybutadiene resin and water-soluble ionic polymer modified polyacrylamide. The triterpenoid saponin has carbohydrate chains with strong hydrophilicity which can be combined with the modified polyacrylamide, so that the strength of the bubble wall is improved, the functions of stabilizing bubbles and reducing the pore diameter of bubbles are realized, the viscosity and the strength of the bubble film are increased, and the liquid film formed by the bubbles has sufficient continuity and elasticity.
Description
Technical Field
The invention belongs to the field of building materials, relates to a concrete air entraining agent, and particularly relates to concrete applied to alpine and high-altitude areas, an air entraining agent and a preparation method.
Background
The air entraining agent can make concrete generate a large amount of uniform, stable and closed micro-bubbles in the stirring process, improve the construction workability of the concrete, and still retain the micro-bubbles after the concrete is hardened, and has the main function of improving the impermeability, frost resistance, salt-frost-erosion resistance and durability of the concrete.
Under the climatic conditions of high cold and high altitude, the temperature difference between day and night is large, the air pressure is low, the freezing and thawing damage of the concrete is more serious compared with that in other areas, and the introduction of micro closed bubbles into the concrete by doping the air entraining agent is a common measure for improving the frost resistance of the concrete. However, under the low air pressure condition, the air content of fresh concrete is linearly reduced along with the ambient air pressure, and when the ambient air pressure is reduced to 50kPa, the air content of the concrete is reduced by about 40%. Meanwhile, the structural parameters of the newly-mixed hardened concrete pore under the low-pressure condition are integrally inferior to those under the normal-pressure condition, and the bubble stability is also poor. Further, the air entraining capability of the common air entraining agent is obviously reduced under the conditions of high cold and high altitude, the air content of the fresh concrete can not meet the use requirement, and the problems of large bubbles, short defoaming time and poor bubble stability exist.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a concrete air entraining agent applied to high-cold high-altitude areas and a preparation method thereof, and solve the technical problem that the air entraining agent in the prior art cannot be applied to the high-cold high-altitude areas.
In order to solve the technical problem, the application adopts the following technical scheme:
a concrete air entraining agent applied to alpine and high-altitude areas is prepared from the following raw materials: triterpenoid saponin solution, water-soluble resin, water-soluble ionic polymer and modifier;
the water-soluble resin is modified polybutadiene resin;
the water-soluble ionic polymer is modified polyacrylamide;
the modifier is sodium carbonate.
The invention also has the following technical characteristics:
specifically, the feed is prepared from the following raw materials in parts by weight: the triterpenoid saponin solution accounts for 92-95 percent, the modified polybutadiene resin accounts for 1.8-2.8 percent, the modified polyacrylamide accounts for 0.7-0.95 percent, the sodium carbonate accounts for 2.5-4.25 percent, and the sum of the weight parts of the raw materials is 100 percent.
Preferably, the feed is prepared from the following raw materials in parts by weight: the triterpenoid saponin solution is 93 percent, the modified polybutadiene resin is 2.2 percent, the modified polyacrylamide is 0.85 percent, and the sodium carbonate is 3.95 percent.
Specifically, the number average molecular weight of the modified polybutadiene resin is 1000-30000; the number average molecular weight of the modified polyacrylamide is 10000-40000.
The invention also discloses a preparation method of the concrete air entraining agent applied to the alpine and high-altitude areas, which adopts the formula of the concrete air entraining agent applied to the alpine and high-altitude areas and specifically comprises the following steps:
step one, preparing a triterpenoid saponin solution:
weighing the gleditsia sinensis, removing dirt on the surface of the gleditsia sinensis by using cleaning liquid, exposing the cleaned gleditsia sinensis in the sun for 3-5 days, and crushing the dried gleditsia sinensis by using a crusher to obtain gleditsia sinensis powder; extracting the gleditsia sinensis powder in a mixture of ethanol and acetone at normal temperature for 2-4 hours, and filtering residues to obtain a triterpenoid saponin solution;
the volume ratio of the ethanol to the acetone is 1: 2;
adding 15-25 kg of a mixture of ethanol and acetone into each 1000g of the Chinese honeylocust correspondingly;
step two, preparing modified polybutadiene resin:
firstly, adding a butadiene monomer and an acid catalyst acetic acid into a reaction kettle for addition polymerization reaction, heating for 2-3 hours at 200-300 ℃ to obtain a polybutadiene solution, then adding rosin, hydrogen peroxide and lignin, and heating at 150-200 ℃ for 1-2 hours to obtain modified polybutadiene resin;
the weight portion is: 30 parts of butadiene monomer, 3-5 parts of acetic acid, 50-60 parts of rosin and 8-10 parts of lignin.
Step three, preparing modified polyacrylamide:
adding acrylonitrile, butanediol and water into a polymerization tank, adding an initiator potassium persulfate, and carrying out polymerization reaction by light irradiation. Irradiating at the temperature of 75-100 ℃ for 3-4 hours, and polymerizing to generate modified polyacrylamide;
the weight portion is: 10 parts of acrylonitrile, 3-5 parts of butanediol and 80-100 parts of water.
Step four, mixing the triterpenoid saponin solution and the modified polybutadiene resin uniformly, then putting the mixture into a high-pressure reaction kettle, heating the mixture for 1-2 hours, keeping the temperature at 95-100 ℃, pumping air in the reaction kettle to the pressure of 1-10 Pa, and removing the air and low-boiling components in the reaction kettle in vacuum to obtain a mixed solution A;
step five, adding modified polyacrylamide into the mixed solution A, and stirring for 20-30 min in a constant-temperature water bath at 40-50 ℃ to obtain a mixed solution B;
and step six, adding sodium carbonate into the mixed solution B at normal temperature and normal pressure, and mixing for 15-35 min to obtain the concrete air entraining agent.
The invention also discloses concrete applied to the alpine and high-altitude areas, which comprises a concrete main body and an air entraining agent in parts by weight, wherein the addition amount of the air entraining agent is 0.01 percent of that of the concrete main body;
specifically, the air entraining agent is the concrete air entraining agent applied to the alpine and high-altitude areas.
Specifically, the concrete main body comprises the following raw materials in parts by weight: 360 parts of cement, 160 parts of water, 725 parts of sand, 1135 parts of broken stone and 2.16 parts of water reducing agent.
Compared with the prior art, the invention has the beneficial technical effects that:
the air entraining agent disclosed by the invention can reduce the surface tension of a solution, generates closed and independent micro bubbles, is long in foam stabilizing time, high in foaming multiple and small in spacing, and has good working performance under the conditions of high cold and high altitude.
Compared with the conventional triterpenoid saponin air entraining agent, the air entraining agent disclosed by the invention is added with water-soluble resin modified polybutadiene resin and water-soluble ionic polymer modified polyacrylamide. The triterpenoid saponin has carbohydrate chains with strong hydrophilicity which can be combined with the modified polyacrylamide, so that the strength of the bubble wall is improved, the functions of stabilizing bubbles and reducing the pore diameter of bubbles are realized, the viscosity and the strength of the bubble film are increased, and the liquid film formed by the bubbles has sufficient continuity and elasticity. The modified polybutadiene resin can be combined with aglycone in the triterpenoid saponin, so that the surface tension of the liquid can be obviously reduced, and the air entraining agent can be ensured to generate enough bubbles.
(III) the tiny bubbles introduced by the air entraining agent can cut off a capillary passage and reduce the capillary action, thereby improving the impermeability of concrete. The micro pores can release the expansion pressure of ice crystals in the capillary during freezing, thereby avoiding the generation of destructive pressure, reducing and preventing the destructive effect of freeze thawing, and improving the frost resistance and durability of concrete when working under the conditions of high cold and high altitude.
(V) the air entraining agent of the invention takes the natural plant gleditsia sinensis as the main raw material, the material acquisition cost is lower, and the preparation process is simpler than the traditional preparation method.
The present invention will be explained in further detail with reference to examples.
Detailed Description
The following embodiments of the present invention are provided, and it should be noted that the present invention is not limited to the following embodiments, and all equivalent changes based on the technical solutions of the present invention are within the protection scope of the present invention.
Example 1:
the embodiment provides a concrete air entraining agent applied to alpine and high-altitude areas, which is prepared from the following raw materials in parts by weight: the triterpenoid saponin solution is 93 percent, the modified polybutadiene resin is 2.2 percent, the modified polyacrylamide is 0.85 percent, and the sodium carbonate is 3.95 percent.
The number average molecular weight of the modified polybutadiene resin is 1000-30000; the number average molecular weight of the modified polyacrylamide is 10000-40000.
The preparation method of the concrete air entraining agent applied to the alpine and high-altitude areas comprises the following steps:
step one, preparing a triterpenoid saponin solution:
weighing the gleditsia sinensis, removing dirt on the surface of the gleditsia sinensis by using cleaning liquid, exposing the cleaned gleditsia sinensis in the sun for 3-5 days, and crushing the dried gleditsia sinensis by using a crusher to obtain gleditsia sinensis powder; extracting the gleditsia sinensis powder in a mixture of ethanol and acetone at normal temperature for 2-4 hours, and filtering residues to obtain a triterpenoid saponin solution;
the volume ratio of the ethanol to the acetone is 1: 2;
adding 15-25 kg of a mixture of ethanol and acetone into each 1000g of the Chinese honeylocust correspondingly;
step two, preparing modified polybutadiene resin:
firstly, adding a butadiene monomer and an acid catalyst acetic acid into a reaction kettle for addition polymerization reaction, heating for 2-3 hours at 200-300 ℃ to obtain a polybutadiene solution, then adding rosin, hydrogen peroxide and lignin, and heating at 150-200 ℃ for 1-2 hours to obtain modified polybutadiene resin;
the weight portion is: 30 parts of butadiene monomer, 3-5 parts of acetic acid, 50-60 parts of rosin and 8-10 parts of lignin.
Step three, preparing modified polyacrylamide:
adding acrylonitrile, butanediol and water into a polymerization tank, adding an initiator potassium persulfate, and carrying out polymerization reaction by light irradiation. Irradiating at the temperature of 75-100 ℃ for 3-4 hours, and polymerizing to generate modified polyacrylamide;
the weight portion is: 10 parts of acrylonitrile, 3-5 parts of butanediol and 80-100 parts of water.
Step four, mixing the triterpenoid saponin solution and the modified polybutadiene resin uniformly, then putting the mixture into a high-pressure reaction kettle, heating the mixture for 1-2 hours, keeping the temperature at 95-100 ℃, pumping air in the reaction kettle to the pressure of 1-10 Pa, and removing the air and low-boiling components in the reaction kettle in vacuum to obtain a mixed solution A;
step five, adding modified polyacrylamide into the mixed solution A, and stirring for 20-30 min in a constant-temperature water bath at 40-50 ℃ to obtain a mixed solution B;
and step six, adding sodium carbonate into the mixed solution B at normal temperature and normal pressure, and mixing for 15-35 min to obtain the concrete air entraining agent.
The application effect of the concrete air entraining agent prepared in the embodiment is shown in an application example.
Example 2:
the embodiment provides a concrete air entraining agent applied to alpine and high-altitude areas, which is prepared from the following raw materials in parts by weight: the triterpenoid saponin solution accounts for 92-95 percent, the modified polybutadiene resin accounts for 1.8-2.8 percent, the modified polyacrylamide accounts for 0.7-0.95 percent, the sodium carbonate accounts for 2.5-4.5 percent, and the sum of the weight parts of the raw materials is 100 percent.
The embodiment provides a concrete air entraining agent applied to alpine and high-altitude areas, which is prepared from the following raw materials in parts by weight: the triterpenoid saponin solution is 92 percent, the modified polybutadiene resin is 2.8 percent, the modified polyacrylamide is 0.95 percent, and the sodium carbonate is 4.25 percent.
The modified polybutadiene resin was the same as in example 1.
The modified polyacrylamide was the same as in example 1.
The preparation method of this example is substantially the same as that of example 1.
The application effect of the concrete air entraining agent prepared by the embodiment is basically the same as that of the embodiment 1.
Example 3:
the embodiment provides a concrete air entraining agent applied to alpine and high-altitude areas, which is prepared from the following raw materials in parts by weight: the triterpenoid saponin solution is 95 percent, the modified polybutadiene resin is 1.8 percent, the modified polyacrylamide is 0.7 percent, and the sodium carbonate is 2.5 percent.
The modified polybutadiene resin was the same as in example 1.
The modified polyacrylamide was the same as in example 1.
The preparation method of this example is substantially the same as that of example 1.
The application effect of the concrete air entraining agent prepared by the embodiment is basically the same as that of the embodiment 1.
Example 4:
the embodiment provides concrete applied to alpine and high-altitude areas, which comprises a concrete main body and an air entraining agent in parts by weight, wherein the addition amount of the air entraining agent is 0.01 percent of that of the concrete main body;
the concrete main body comprises the following raw materials in parts by weight: 360 parts of cement, 160 parts of water, 725 parts of sand, 1135 parts of broken stone and 2.16 parts of water reducing agent.
Wherein:
the air entraining agent used in the concrete applied to the alpine and high-altitude area in the embodiment 1 is adopted.
The water reducing agent is a conventional water reducing agent in the field.
The concrete of the embodiment is prepared by adopting a conventional concrete preparation method.
The concrete performance test results of this example are shown in the application examples.
Application example:
the cement selected in the test is P.O 42.5.5; the sand is medium sand, the fineness modulus is 2.6, and the mud content is 1.1%; the stones are limestone broken stones with the particle size of 5-20 mm, and the mass fraction of mud is 0.7%; the water is common drinking water. Concrete mixing is completed in a low-pressure simulation box, and the air pressure is set to be 50 kpa.
The concrete formulations are shown in table 1 below in parts by weight.
TABLE 1 concrete mix proportion
Control group 1: adopting the concrete without adding the air entraining agent according to the mixing ratio;
control group 2: the concrete with the proportion added with 0.01 percent of rosin thermopolymer air entraining agent is adopted;
control group 3: adopting the concrete added with 0.01 percent of polyether air entraining agent according to the mixing ratio;
control group 4: adopting the concrete added with 0.01 percent of the conventional triterpenoid saponin air entraining agent according to the mixing proportion;
application example: the concrete of the air entraining agent for alpine and high altitude of the invention embodiment 1 is added by 0.01 percent of the mixing ratio.
The fresh concrete in the above experiment was subjected to air content test and 300 freeze-thaw cycle test, and the concrete test method for measuring dynamic elastic modulus and mass loss was referred to "concrete test protocol", and the results are shown in table 2 below.
TABLE 2 test results
As can be seen from table 2, under the low-pressure condition simulated by the test chamber, the air content of the concrete added with the air-entraining agent in the alpine and high-altitude area in the control group is obviously improved compared with the air content of the concrete added with other air-entraining agents, which indicates that the air-entraining agent in the alpine and high-altitude area has good air-entraining capability under the low-pressure condition. The results of freeze-thaw cycle tests show that the relative dynamic elastic modulus of the first three groups of concrete without or with other air entraining agents is reduced to about 60% after the concrete undergoes 300 freeze-thaw cycles, and the mass loss is close to 5%, which indicates that the internal structure of the concrete is damaged. In contrast 4, the relative dynamic elastic modulus and the mass loss were slightly better than those of the first three groups, but the dynamic elastic modulus was reduced to about 80%, and the mass loss was close to 2%, indicating that the concrete structure of the contrast 4 was also significantly damaged. The loss of the dynamic elastic modulus and the mass of the concrete added with the alpine high-altitude air entraining agent is small after the concrete undergoes freeze-thaw cycle for 300 times, the relative dynamic elastic modulus can be kept at about 90%, the mass loss is about 1%, the function of the concrete is not damaged basically, and the frost resistance of the concrete doped with the alpine high-altitude air entraining agent is obviously better than that of other types of air entraining agents.
In conclusion, the liquid air entraining agent applied to the alpine and high-altitude areas, which is prepared by the invention, can generate a large amount of uniform and stable bubbles and improve the internal structure of concrete, so that the durability and the service life of the concrete are improved, and the liquid air entraining agent has great economic benefit and strategic significance.
Claims (6)
1. A concrete air entraining agent applied to alpine and high-altitude areas is prepared from the following raw materials in parts by weight: the triterpenoid saponin solution accounts for 92-95 percent, the modified polybutadiene resin accounts for 1.8-2.8 percent, the modified polyacrylamide accounts for 0.7-0.95 percent, the sodium carbonate accounts for 2.5-4.25 percent, and the sum of the weight parts of the raw materials is 100 percent;
the preparation method of the concrete air entraining agent applied to the alpine and high-altitude areas comprises the following steps:
step one, preparing a triterpenoid saponin solution:
weighing the gleditsia sinensis, removing dirt on the surface of the gleditsia sinensis by using cleaning liquid, exposing the cleaned gleditsia sinensis in the sun for 3-5 days, and crushing the dried gleditsia sinensis by using a crusher to obtain gleditsia sinensis powder; extracting the gleditsia sinensis powder in a mixture of ethanol and acetone at normal temperature for 2-4 hours, and filtering residues to obtain a triterpenoid saponin solution;
the volume ratio of the ethanol to the acetone is 1: 2;
adding 15-25 kg of a mixture of ethanol and acetone into each 1000g of the Chinese honeylocust correspondingly;
step two, preparing modified polybutadiene resin:
firstly, adding a butadiene monomer and an acid catalyst acetic acid into a reaction kettle for addition polymerization reaction, heating for 2-3 hours at 200-300 ℃ to obtain a polybutadiene solution, then adding rosin, hydrogen peroxide and lignin, and heating at 150-200 ℃ for 1-2 hours to obtain modified polybutadiene resin;
the weight portion is: 30 parts of butadiene monomer, 3-5 parts of acetic acid, 50-60 parts of rosin and 8-10 parts of lignin;
step three, preparing modified polyacrylamide:
adding acrylonitrile, butanediol and water into a polymerization tank, adding an initiator potassium persulfate, and performing polymerization reaction by light irradiation; irradiating at the temperature of 75-100 ℃ for 3-4 hours, and polymerizing to generate modified polyacrylamide;
the weight portion is: 10 parts of acrylonitrile, 3-5 parts of butanediol and 80-100 parts of water;
step four, mixing the triterpenoid saponin solution and the modified polybutadiene resin uniformly, then putting the mixture into a high-pressure reaction kettle, heating the mixture for 1-2 hours, keeping the temperature at 95-100 ℃, pumping air in the reaction kettle to the pressure of 1-10 Pa, and removing the air and low-boiling components in the reaction kettle in vacuum to obtain a mixed solution A;
step five, adding modified polyacrylamide into the mixed solution A, and stirring for 20-30 min in a constant-temperature water bath at 40-50 ℃ to obtain a mixed solution B;
and step six, adding sodium carbonate into the mixed solution B at normal temperature and normal pressure, and mixing for 15-35 min to obtain the concrete air entraining agent.
2. The concrete air entraining agent applied to the alpine and high-altitude areas as claimed in claim 1, which is prepared from the following raw materials in parts by weight: the triterpenoid saponin solution is 93 percent, the modified polybutadiene resin is 2.2 percent, the modified polyacrylamide is 0.85 percent, and the sodium carbonate is 3.95 percent.
3. The concrete air entraining agent applied to the alpine and high-altitude areas as claimed in claim 1, wherein the number average molecular weight of the modified polybutadiene resin is 1000-30000; the number average molecular weight of the modified polyacrylamide is 10000-40000.
4. A method for preparing a concrete air entraining agent applied to alpine and high-altitude areas, which is characterized by adopting the formula of the concrete air entraining agent applied to the alpine and high-altitude areas as claimed in any one of claims 2 to 3, and specifically comprising the following steps:
step one, preparing a triterpenoid saponin solution:
weighing the gleditsia sinensis, removing dirt on the surface of the gleditsia sinensis by using cleaning liquid, exposing the cleaned gleditsia sinensis in the sun for 3-5 days, and crushing the dried gleditsia sinensis by using a crusher to obtain gleditsia sinensis powder; extracting the gleditsia sinensis powder in a mixture of ethanol and acetone at normal temperature for 2-4 hours, and filtering residues to obtain a triterpenoid saponin solution;
the volume ratio of the ethanol to the acetone is 1: 2;
adding 15-25 kg of a mixture of ethanol and acetone into each 1000g of the Chinese honeylocust correspondingly;
step two, preparing modified polybutadiene resin:
firstly, adding a butadiene monomer and an acid catalyst acetic acid into a reaction kettle for addition polymerization reaction, heating for 2-3 hours at 200-300 ℃ to obtain a polybutadiene solution, then adding rosin, hydrogen peroxide and lignin, and heating at 150-200 ℃ for 1-2 hours to obtain modified polybutadiene resin;
the weight portion is: 30 parts of butadiene monomer, 3-5 parts of acetic acid, 50-60 parts of rosin and 8-10 parts of lignin;
step three, preparing modified polyacrylamide:
adding acrylonitrile, butanediol and water into a polymerization tank, adding an initiator potassium persulfate, and performing polymerization reaction by light irradiation; irradiating at the temperature of 75-100 ℃ for 3-4 hours, and polymerizing to generate modified polyacrylamide;
the weight portion is: 10 parts of acrylonitrile, 3-5 parts of butanediol and 80-100 parts of water;
step four, mixing the triterpenoid saponin solution and the modified polybutadiene resin uniformly, then putting the mixture into a high-pressure reaction kettle, heating the mixture for 1-2 hours, keeping the temperature at 95-100 ℃, pumping air in the reaction kettle to the pressure of 1-10 Pa, and removing the air and low-boiling components in the reaction kettle in vacuum to obtain a mixed solution A;
step five, adding modified polyacrylamide into the mixed solution A, and stirring for 20-30 min in a constant-temperature water bath at 40-50 ℃ to obtain a mixed solution B;
and step six, adding sodium carbonate into the mixed solution B at normal temperature and normal pressure, and mixing for 15-35 min to obtain the concrete air entraining agent.
5. The concrete applied to the alpine and high-altitude areas comprises a concrete main body and an air entraining agent in parts by weight, and is characterized in that the addition amount of the air entraining agent is 0.01 percent of that of the concrete main body;
the air entraining agent is the concrete air entraining agent applied to the alpine and high-altitude area according to any one of claims 1 to 3.
6. The concrete applied to the alpine and high-altitude areas as claimed in claim 5, wherein the concrete body is composed of the following raw materials in parts by weight: 360 parts of cement, 160 parts of water, 725 parts of sand, 1135 parts of broken stone and 2.16 parts of water reducing agent.
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| CN105330196A (en) * | 2015-11-12 | 2016-02-17 | 天元建设集团有限公司 | Foam concrete foaming agent and application thereof |
| CN106082764A (en) * | 2016-05-30 | 2016-11-09 | 西藏育才五色石能源科技有限公司 | A kind of water-soluble high-efficient concrete Colophonium air entraining agent and preparation method thereof |
| CN107473619A (en) * | 2017-08-18 | 2017-12-15 | 杨小英 | Concrete antifreezing water reducer |
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|---|---|
| CN108675672A (en) | 2018-10-19 |
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