CN113929348B - Concrete performance improving agent and preparation method thereof - Google Patents
Concrete performance improving agent and preparation method thereof Download PDFInfo
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- CN113929348B CN113929348B CN202111317135.7A CN202111317135A CN113929348B CN 113929348 B CN113929348 B CN 113929348B CN 202111317135 A CN202111317135 A CN 202111317135A CN 113929348 B CN113929348 B CN 113929348B
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a concrete performance improver and a preparation method thereof, belonging to the technical field of concrete admixtures. The contradiction between concrete fluidity, fluidity maintenance, concrete segregation and bleeding is effectively solved, and the concrete performance improver comprises the following raw materials in parts by weight: 1-3 parts of triethylene glycol, 1-3 parts of diethylene glycol, 5-8 parts of inorganic dispersion component, 0.1-1 part of ethylene diamine tetramethylene phosphonic acid sodium, 3-8 parts of modified starch, 0.1-0.5 part of diethanol monoisopropanolamine, 0.001-0.01 part of air entraining agent, 1-2 parts of manganese pyrophosphate and 80-100 parts of zeolite powder. The invention can be used for improving the performance of concrete.
Description
Technical Field
The invention belongs to the technical field of concrete admixtures, and particularly relates to a concrete performance improver and a preparation method thereof.
Background
Concrete is one of the most important civil engineering materials in the present day, and with the development of construction engineering, more and more concrete is utilized in a large amount. The fluidity of the concrete is a necessary condition for realizing the performance of the concrete, and the insufficient fluidity can cause the uneven, non-compact and cellular pitted surface of the concrete, thereby seriously affecting the quality of the concrete and reducing the service life of a concrete structure.
At present, the core component of concrete, namely cement, is thinner and thinner, the components are more and more complex, and the water-cement ratio is lower and lower. Some cement has fineness as high as 420m 2 The slump loss is increased rapidly when the hydration speed is increased. The wide application of bulk industrial solid wastes such as fly ash, slag powder, coal gangue, industrial waste gypsum and the like makes the components of the cementing material more complex; particularly, the resources of high-quality sand and stone are increasingly deficient, and the water absorption rate and the mud content of the aggregate are increased, so that the initial fluidity of the concrete is greatly reduced, and the fluidity is more difficult to maintain. The concrete with fluidity and slow-setting performance is easy to separate and bleed only by increasing the dosage of the water reducing agent and the slow-setting agent, and the working and pumping performance of the concrete are influenced.
Disclosure of Invention
The invention aims to overcome the defects and provide a concrete performance improver, which effectively solves the contradiction between concrete fluidity and fluidity maintenance and concrete segregation and bleeding and improves the working performance of concrete.
The invention also provides a preparation method of the concrete performance improver.
The concrete performance improver comprises the following raw materials in parts by weight: 1-3 parts of triethylene glycol, 1-3 parts of diethylene glycol, 5-8 parts of inorganic dispersion component, 0.1-1 part of ethylene diamine tetramethylene phosphonic acid sodium, 3-8 parts of modified starch, 0.1-0.5 part of diethanol monoisopropanolamine, 0.001-0.01 part of air entraining agent, 1-2 parts of manganese pyrophosphate and 80-100 parts of zeolite powder.
The inorganic dispersion component is aluminum silicate or ammonium polyphosphate.
Preferably, the ammonium polyphosphate is ammonium tripolyphosphate.
Preferably, the aluminum silicate particle size is 900 mesh.
The air entraining agent is triterpenoid saponin air entraining agent or sodium dodecyl sulfate.
The preparation method of the concrete performance improver comprises the following steps:
(1) Uniformly mixing triethylene glycol, diethylene glycol, ethylene diamine tetramethylene phosphonate and air entraining agent, spraying the mixture on the surface of zeolite powder, uniformly mixing, and aging for 12-24 hours to ensure that the zeolite powder fully absorbs the triethylene glycol, the diethylene glycol, the ethylene diamine tetramethylene phosphonate and the air entraining agent to obtain modified zeolite powder;
(2) And (2) uniformly mixing diethanol monoisopropanolamine, manganese pyrophosphate and modified zeolite powder, adding modified starch, stirring and drying, then crushing, and sieving with a 200-mesh sieve to obtain the concrete performance improver.
The modified starch is obtained by hydrolyzing and modifying starch;
the preparation method comprises the following steps:
uniformly mixing water and starch to prepare starch slurry with the mass content of 10-30%, and heating to 30-45 ℃;
adding maleic anhydride, ethylene sulfite, vinyl phosphonic acid, sulfamic acid and thioglycollic acid, uniformly mixing, heating to 50-60 ℃, reacting for 2-3h, cooling to room temperature, and adjusting the pH value to 6-8 to obtain the modified starch.
The addition amounts of the maleic anhydride, the ethylene sulfite, the vinylphosphonic acid, the sulfamic acid and the thioglycolic acid respectively account for 5-10%, 3-5%, 1-3%, 0.1-0.5% and 0.01-0.1% of the mass of the starch.
The widely used polycarboxylic acid water reducing agent has larger molecular weight at present, and can not disperse small-particle gelled materials which are easy to aggregate, but triethylene glycol and diethylene glycol in the invention can be adsorbed on the small particles to fully disperse the small particles, so that water wrapped in the small particles is released, the dispersing effect of the water reducing agent is improved, and concrete has better fluidity;
the inorganic dispersant can provide electrostatic repulsion, and the particles are much smaller than the gelled material particles in the concrete, so that gaps among the particles can be filled, friction is reduced, the suspension stability of the gelled material in the concrete is improved, the rheological property of the concrete can be improved, the concrete can be more compact, and the strength of the concrete is improved;
the modified starch can effectively improve the viscosity of concrete slurry, improve the slurry wrapping capacity of an aggregate interface, obviously enhance the bonding property of the aggregate and the slurry, and ensure that phosphate radical has certain retarding effect;
the diethanol monoisopropanolamine plays a role in dispersing in the slurry and can improve the strength of the slurry in the early stage, the middle stage and the later stage;
the addition of manganese pyrophosphate can improve the viscosity and early strength of the system.
Compared with the prior art, the invention has the beneficial effects that:
the components of the invention are effectively cooperated, the contradiction between the fluidity and the fluidity maintenance of the concrete and the segregation and bleeding of the concrete can be effectively solved, the working performance of the concrete is improved, and the effective components are uniformly distributed in the zeolite powder particles and slowly released along with the time, so that the fluidity of the concrete is stable and controllable in the whole conveying and construction process. The dispersant and the modified starch have synergistic effect in the transportation process, so that the mortar hanging performance of the aggregate is better improved, and the problem of slurry sinking is avoided.
Detailed Description
The present invention is further illustrated by the following specific examples.
Example 1
The raw material composition of the concrete performance improver is shown in table 1.
The modified starch is obtained by hydrolyzing and modifying starch, and the preparation method comprises the following steps: (1) Uniformly mixing water and starch to prepare 10% starch slurry, and heating to 45 ℃; (2) Adding maleic anhydride accounting for 5% of the mass of the starch, ethylene sulfite accounting for 5% of the mass of the starch, vinyl phosphonic acid accounting for 1% of the mass of the starch, sulfamic acid accounting for 0.5% of the mass of the starch and thioglycolic acid accounting for 0.01% of the mass of the starch, uniformly mixing, heating to 60 ℃, reacting for 2 hours, cooling to room temperature, and adjusting the pH value to 8 to obtain the modified starch.
The preparation method of the concrete performance improver comprises the following steps:
(1) Mixing triethylene glycol, diethylene glycol, sodium ethylene diamine tetramethylene phosphonate and an air entraining agent, uniformly spraying the mixture on the surface of zeolite powder, uniformly mixing, and aging to ensure that the zeolite powder fully absorbs the triethylene glycol, the diethylene glycol, the sodium ethylene diamine tetramethylene phosphonate and the air entraining agent to obtain modified zeolite powder;
(2) And (2) uniformly mixing diethanolisopropanolamine and manganese pyrophosphate with the modified zeolite powder obtained in the step (1), adding modified starch, stirring and drying. Then crushing, grinding and sieving with a 200-mesh sieve to obtain the concrete performance improver.
Example 2
The raw material composition of the concrete performance improver is shown in table 1.
The modified starch is obtained by hydrolyzing and modifying starch, and the preparation method comprises the following steps: (1) Uniformly mixing water and starch to prepare 30% starch slurry, and heating to 30 ℃; (2) Adding vinyl sulfate accounting for 10% of the mass of the starch, vinyl sulfite accounting for 3% of the mass of the starch, vinyl phosphonic acid accounting for 3% of the mass of the starch, sulfamic acid accounting for 0.1% of the mass of the starch and thioglycolic acid accounting for 0.1% of the mass of the starch, uniformly mixing, heating to 50 ℃, reacting for 3 hours, cooling to room temperature, and adjusting the pH value to 6 to obtain the modified starch.
The preparation method of the concrete performance improver is the same as that of the example 1.
Example 3
The raw material composition of the concrete performance improver is shown in table 1.
The modified starch is obtained by hydrolyzing and modifying starch, and the preparation method comprises the following steps: (1) Uniformly mixing water and starch to prepare 21% starch slurry, and heating to 38 ℃; (2) Adding vinyl sulfate accounting for 8% of the mass of the starch, vinyl sulfite accounting for 4% of the mass of the starch, vinyl phosphonic acid accounting for 2% of the mass of the starch, sulfamic acid accounting for 0.4% of the mass of the starch and thioglycolic acid accounting for 0.07% of the mass of the starch, uniformly mixing, heating to 57 ℃, reacting for 2.5 hours, cooling to room temperature, and adjusting the pH value to 7 to obtain the modified starch.
The preparation method of the concrete performance improver is the same as that of the example 1.
Example 4
The raw material composition of the concrete performance improver is shown in table 1.
The modified starch was prepared as in example 3.
The preparation method of the concrete performance improver is the same as that of the example 1.
Comparative example 1
The raw material composition of the concrete performance improver is shown in table 1.
The preparation method of the concrete performance improver is the same as that of example 1.
Comparative examples 2 to 3
The raw material composition of the concrete performance improver is shown in table 1.
The modified starch was prepared as in example 3.
The preparation method of the concrete performance improver is the same as that of example 1.
TABLE 1 raw Material composition of concrete Performance improver
Performance test
The examples 1 to 4 and comparative examples 1 to 3 were subjected to performance tests.
The slump, bleeding rate and compressive strength of the concrete are all carried out according to GB/T50080-2016 Standard test method for Performance of common concrete mixture, and the mixing proportion of the concrete is as follows: fly ash: and (3) machining sand: breaking stone: water: water reducing agent: performance improver =350: 2, the test results are shown in table 2.
Wherein, the blank test is not added with the concrete performance improving agent.
Table 2 results of performance testing
As can be seen from Table 1, the unmodified starch was used in comparative example 1, and the other raw materials and amounts were the same as those in example 3, and from Table 2, it can be seen that the concrete of comparative example 1 had a small initial and 2h slump, a small spreading, an increased bleeding rate, and a small strength. The modified starch can effectively improve the viscosity of concrete slurry, improve the slurry wrapping capacity of an aggregate interface and obviously enhance the bonding property of the aggregate and the slurry.
Comparative example 2 No diethanolisopropanolamine was added, and the other raw materials and amounts were the same as those in example 3, and it can be seen from Table 2 that the strength of the concrete of comparative example 2 was reduced in 7d and 28d, indicating that diethanolisopropanolamine can improve the early, middle and late strengths.
Comparative example 3 manganese pyrophosphate is not added, other raw materials and the quantity are the same as those in example 3, and table 2 shows that the compressive strength of the concrete of the comparative example 3 is reduced, the bleeding rate is increased, and the fact that the addition of manganese pyrophosphate can improve the viscosity and early strength of a system is shown.
Claims (5)
1. The concrete performance improver is characterized by comprising the following raw materials in parts by weight: 1-3 parts of triethylene glycol, 1-3 parts of diethylene glycol, 5-8 parts of inorganic dispersion component, 0.1-1 part of sodium ethylene diamine tetramethylene phosphonate, 3-8 parts of modified starch, 0.1-0.5 part of diethanol monoisopropanolamine, 0.001-0.01 part of air entraining agent, 1-2 parts of manganese pyrophosphate and 80-100 parts of zeolite powder; the inorganic dispersion component is aluminum silicate or ammonium polyphosphate;
the modified starch is obtained by hydrolyzing and modifying starch, and the specific preparation method comprises the following steps:
uniformly mixing water and starch to prepare starch slurry with the mass content of 10-30%, and heating to 30-45 ℃;
adding maleic anhydride, ethylene sulfite, vinyl phosphonic acid, sulfamic acid and thioglycollic acid, uniformly mixing, heating to 50-60 ℃, reacting for 2-3h, cooling to room temperature, and adjusting the pH value to 6-8 to obtain the modified starch.
2. The concrete property improving agent according to claim 1, wherein: the ammonium polyphosphate is ammonium tripolyphosphate.
3. The concrete property improving agent according to claim 1, wherein: the granularity of the aluminum silicate is 900 meshes.
4. The concrete property improving agent according to claim 1, wherein: the air entraining agent is triterpenoid saponin air entraining agent or sodium dodecyl sulfate.
5. The concrete property improving agent according to claim 1, wherein: the addition amounts of the maleic anhydride, the ethylene sulfite, the vinyl phosphonic acid, the sulfamic acid and the thioglycolic acid respectively account for 5-10%, 3-5%, 1-3%, 0.1-0.5% and 0.01-0.1% of the mass of the starch.
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| CN113929348B true CN113929348B (en) | 2022-11-25 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103723946B (en) * | 2013-12-26 | 2015-09-02 | 广州市文建高新材料科技有限公司 | A kind of energy saving and environment friendly fresh concrete activator |
| CN105731856B (en) * | 2016-03-30 | 2018-01-19 | 河海大学 | A kind of preparation method of starch base cement water reducing agent |
| KR101732895B1 (en) * | 2016-07-14 | 2017-05-08 | 일우토건(주) | polymer mortar compositon and repairing method of water permeable concrete road surface using the same |
| CN109942219B (en) * | 2019-04-26 | 2021-08-31 | 山西格瑞特建筑科技股份有限公司 | Concrete glue reducing agent with slump retaining effect |
| CN111925149A (en) * | 2020-08-31 | 2020-11-13 | 杭州中奥工业设计有限公司 | Composite additive for sprayed concrete |
| CN112521046A (en) * | 2020-12-31 | 2021-03-19 | 杭州佳恒建筑科技有限公司 | Slow-release concrete performance improver and preparation method thereof |
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Address after: 241000 No. 1-301, Area G, Construction Headquarters, Jiangbei New Area, Wuhu City, 150 meters south of Tongjiang Avenue, Jiangbei New Area, Wanjiang New Industry Cluster (except the trusteeship area), Wuhu City Patentee after: Anhui Conch Material Technology Co.,Ltd. Patentee after: Linyi conch New Material Technology Co.,Ltd. Address before: Room 208, No. 1 Building, No. 9 Wanjiang Avenue, Jiangbei Industrial Concentration Area, Wuhu City, Anhui Province Patentee before: Anhui Conch New Materials Technology Co.,Ltd. Patentee before: Linyi conch New Material Technology Co.,Ltd. |