CN111732365A - Concrete composite admixture and preparation method thereof - Google Patents
Concrete composite admixture and preparation method thereof Download PDFInfo
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- CN111732365A CN111732365A CN202010711301.0A CN202010711301A CN111732365A CN 111732365 A CN111732365 A CN 111732365A CN 202010711301 A CN202010711301 A CN 202010711301A CN 111732365 A CN111732365 A CN 111732365A
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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
- C04B40/0046—Premixtures of ingredients characterised by their processing, e.g. sequence of mixing the ingredients when preparing the premixtures
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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
Abstract
The invention discloses a concrete composite admixture which comprises the following raw materials in parts by mass: 50-60 parts of silicon micropowder, 15-30 parts of fly ash, 15-30 parts of limestone powder, 10-20 parts of steel slag powder, 8-20 parts of tuff powder and 5-15 parts of activating agent; the technical scheme of the invention is that the activating agent is prepared and then added into the mixer together with other crushed raw materials for stirring, so that the concrete can be fully and uniformly stirred, and through the addition of the activating agent, the composite admixture has higher activity, the compressive strength of the concrete is further improved after 28 days, various performances of the concrete are greatly improved, and the performances of the mineral admixture are fully excited.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to a concrete composite admixture and a preparation method thereof.
Background
The concrete is a mixture prepared by mixing a cementing material (organic, inorganic or organic-inorganic composite), granular aggregate, water, a chemical additive and a mineral admixture which need to be added according to a proper proportion, or a composite material (generally a cementing material, water, fine aggregate and coarse aggregate which need to be added with the additive and the mineral admixture according to a proper proportion) with an aggregate structure after hardening.
The concrete has the characteristics of rich raw materials, low price and simple production process, so that the consumption of the concrete is increased more and more. Meanwhile, the concrete also has the characteristics of high compressive strength, good durability, wide strength grade range and the like. These characteristics make it very widely used, not only in various civil engineering, that is shipbuilding, machinery industry, ocean development, geothermal engineering, etc., but also concrete is an important material.
Concrete is a vital building material. With the continuous development of concrete composition materials, people continuously improve the understanding of material compounding technology. The performance requirements on the concrete are not limited to compressive strength, but the balance and coordination of comprehensive indexes such as durability, deformation performance and the like of the heavy concrete are added on the basis of the standing strength. The requirements of various performance indexes of the concrete are more definite, detailed and concrete than before. Meanwhile, the horizontal lifting of the construction equipment and the continuous emergence and popularization of a novel construction process enable the concrete technology to adapt to different design, construction and use requirements, and the development is fast.
Concrete is not a single material that exists in isolation. It is not necessary to develop raw materials for concrete, and not necessary to change the development of engineering application objects of concrete. Concrete should be treated seriously from the viewpoint of the general discipline of civil engineering. The concrete mix proportion design also comprises the steps of firstly analyzing the structure, member characteristics and design requirements of engineering projects, estimating possible adverse conditions and risks, and sufficiently determining local raw materials. The high-quality concrete meeting the design requirements, the construction process requirements and the use requirements is prepared.
With the development of modern concrete application technology, mineral admixtures have become one of the essential important components of concrete. However, with the high-speed progress of the infrastructure of our country, the high-quality mineral admixtures such as mineral powder and fly ash face the problems of resource shortage and uneven distribution in the area, which leads to the gradual increase of the production cost of concrete production enterprises. The concrete admixture is used for improving the performance of concrete, saving water, adjusting the strength grade of the concrete and adding natural or artificial substances capable of improving the performance of the concrete during the mixing of the concrete. Along with the continuous increase of the concrete industry and the restriction of the country on resource development, mineral admixtures are in more and more shortage, and the price is higher and higher, so that the production cost of concrete is higher and higher. Many mixing stations are therefore beginning to wish to find a better way to replace mineral admixtures, and to wish to reduce the energy consumption of the minerals through the use of complex admixtures.
The conventional composite admixture uses a large amount of inactive mixed materials such as limestone and the like, and the composite admixture has low later activity, so that compared with the conventional active mineral admixture, the working performance of the concrete is greatly reduced by adopting the admixture with the same amount to produce the concrete with the same grade, and particularly the performance is greatly reduced after 28 days. The 28-day activity index of the limestone powder is usually only 60-70 percent, and the requirement of concrete on the activity of the composite admixture is difficult to meet.
Disclosure of Invention
The invention aims to provide a concrete composite admixture and a preparation method thereof, which solve the problems that the working performance of concrete is greatly reduced, and particularly the performance is greatly reduced after 28 days when the same amount of admixture is used for producing the concrete with the same grade compared with the conventional active mineral admixture because the conventional composite admixture uses a large amount of inactive mixed materials such as limestone and the like and the activity of the composite admixture in the later period is low.
The invention is realized in such a way that the concrete composite admixture comprises the following raw materials in parts by mass:
50-60 parts of silicon micropowder, 15-30 parts of fly ash, 15-30 parts of limestone powder, 10-20 parts of steel slag powder, 8-20 parts of tuff powder and 5-15 parts of activating agent;
the activating agent comprises the following raw materials in parts by mass: 2-10 parts of hydrated lime, 1-5 parts of sodium sulfate, 4-10 parts of sodium silicate, 10-30 parts of calcium sulfate, 0.5-2 parts of amide mixture, 0.2-0.8 part of cellulose ether, 0.5-1.5 parts of acrylic acid, 1-3 parts of epoxy resin, 0.2-1.5 parts of dispersant and 15-30 parts of water.
The further technical scheme of the invention is as follows: the concrete composite admixture comprises the following raw materials in parts by mass:
58 parts of silicon micropowder, 20 parts of fly ash, 20 parts of limestone powder, 15 parts of steel slag powder, 12 parts of tuff powder and 8 parts of activating agent.
The further technical scheme of the invention is as follows: the silicon micropowder is prepared from quartzite through crushing, grinding and other processes, and SiO2The content is more than 90 percent.
The further technical scheme of the invention is as follows: the amide mixture consists of polyacrylamide, N-N dimethylacetamide and polymethacrylamide, and the mass parts of the amide mixture are as follows: 1-3:1: 1-2.
The further technical scheme of the invention is as follows: the cellulose ether is hydroxypropyl methyl cellulose ether.
The further technical scheme of the invention is as follows: the dispersant is one of methanol, ethanol, isopropanol, ethylene glycol and propylene glycol.
A preparation method of a concrete composite admixture comprises the following steps:
firstly, drying silicon micropowder, fly ash, limestone powder, steel slag powder and tuff powder for later use;
adding the amide mixture, the cellulose ether, the acrylic acid, the epoxy resin and the dispersing agent into a reaction kettle according to a ratio, stirring, and reacting for 1.5 hours under the conditions that the pressure is 4MPa and the temperature is 60 ℃;
step three, placing the mixture after the reaction in an ultrasonic generator, and treating the mixture for 30-60min by using 200-500W ultrasonic waves;
adding slaked lime, sodium sulfate, sodium silicate and calcium sulfate into water according to a proportion, and mixing and stirring the mixture and the mixture obtained in the second step for 30min to obtain an activator precursor;
placing the prepared activator precursor under strong ultraviolet light with the power of 80W-100W and the wavelength of 100-200nm for treatment for 30 min;
step six, adding the materials in the step one into a ball mill according to a proportion for grinding, wherein the grinding fineness reaches Bosch specific surface area not less than 400m2Kg, or the screen allowance of a 0.08mm square-hole screen is not more than 2 percent, or the screen allowance of a 0.045mm square-hole screen is not more than 20 percent;
and step seven, putting the mixed material obtained in the step three and the activating agent in the step five into a stirrer together, stirring at the rotating speed of 45-50r/min for 5-10min, and obtaining the concrete composite admixture.
The invention has the beneficial effects that:
1. the technical scheme of the invention is that the activating agent is prepared and then added into the mixer together with other crushed raw materials for stirring, so that the concrete can be fully and uniformly stirred, and through the addition of the activating agent, the composite admixture has higher activity, the compressive strength of the concrete is further improved after 28 days, various performances of the concrete are greatly improved, and the performances of the mineral admixture are fully excited;
2. in the activator aspect, the invention incorporates an ultrasonic treatment process to treat the activator produced by the reaction. The ultrasonic treatment method has two effects of heating molecules and vibrating at high frequency. By raising the temperature, small molecules such as acrylic acid, which have not sufficiently reacted in the second step, can be sufficiently reacted with the epoxy resin. And through the high-frequency vibration of molecules, the macromolecules (cellulose ether) can be fully crosslinked, and small molecules are wrapped, so that the activating agent can be fully dispersed, and the release of the small molecules is delayed by wrapping the small molecules. The micromolecules are delayed to release, so that the defect that the strength of concrete is influenced due to the fact that the traditional activator is rapidly hydrated in the early stage and high in hydration heat is overcome, and the later-stage compressive strength of the concrete is fully improved. Then, a small amount of residual unsaturated bonds in the activating agent are broken through ultraviolet light treatment, free radicals are generated, bonding with concrete components is enhanced in the cement hydration process, the tightness of the combination of the activating agent and the cement is increased, and the activity index of the admixture can be greatly improved;
3. the activator component selected by the invention has strong pertinence. Wherein, the calcium sulfate supplements sulfate radicals in the composite admixture in a targeted manner, and the setting time and the workability of the composite admixture are adjusted to ensure the construction performance of the concrete. The hydrated lime keeps the whole composite admixture in an alkaline environment so as to be convenient for storage and adapt to the alkaline environment of concrete. Sodium silicate is grinding aid, promotes the grinding efficiency of overall process. The amide mixture is a rust inhibitor and can delay the corrosion of the steel bar when being applied to reinforced concrete. The epoxy resin is a cohesive agent and a thickening agent, and keeps the cohesiveness of the concrete;
4. the invention adopts more silica powder to replace limestone powder and other materials with lower activity. The silica powder has a large amount of nano-scale particles with the particle size of 50-500nm, and the specific surface area of the silica powder is more than 30 times of that of the limestone powder. After macromolecules in the activating agent release small molecules, the silicon micro powder particles can be wrapped, and better dispersing and crosslinking effects are achieved. Meanwhile, tiny gaps in concrete can be filled by the extremely small particle size of the silicon micropowder, the compactness of the concrete is increased, and therefore the strength is improved.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Example 1:
the concrete composite admixture comprises the following raw materials in parts by mass:
50 parts of silicon micropowder, 15 parts of fly ash, 15 parts of limestone powder, 10 parts of steel slag powder, 8 parts of tuff powder and 5 parts of activating agent.
The silicon micropowder is prepared from quartzite through crushing, grinding and other processes, and SiO2The content is more than 90 percent.
The activating agent comprises the following raw materials in parts by mass: 2 parts of hydrated lime, 1 part of sodium sulfate, 4 parts of sodium silicate, 10 parts of calcium sulfate, 0.5 part of amide mixture, 0.2 part of cellulose ether, 0.5 part of acrylic acid, 1 part of epoxy resin, 0.2 part of dispersant and 15 parts of water.
The amide mixture consists of polyacrylamide, N-N dimethylacetamide and polymethacrylamide, and the mass parts of the amide mixture are as follows: 1-3:1: 1-2.
The cellulose ether is hydroxypropyl methyl cellulose ether.
The dispersant is methanol.
A preparation method of a concrete composite admixture comprises the following steps:
firstly, drying silicon micropowder, fly ash, limestone powder, steel slag powder and tuff powder for later use;
adding the amide mixture, the cellulose ether, the acrylic acid, the epoxy resin and the dispersing agent into a reaction kettle according to a ratio, stirring, and reacting for 1.5 hours under the conditions that the pressure is 4MPa and the temperature is 60 ℃;
step three, placing the mixture after the reaction in an ultrasonic generator, and treating the mixture for 30min by using 200W ultrasonic waves;
adding slaked lime, sodium sulfate, sodium silicate and calcium sulfate into water according to a proportion, and mixing and stirring the mixture and the mixture obtained in the second step for 30min to obtain an activator precursor;
placing the prepared activator precursor under strong ultraviolet light with the power of 80W and the wavelength of 100nm for treatment for 30 min;
step six, adding the materials in the step one into a ball mill according to a proportion for grinding, wherein the grinding fineness reaches Bosch specific surface area not less than 400m2Kg, or the screen allowance of a 0.08mm square-hole screen is not more than 2 percent, or the screen allowance of a 0.045mm square-hole screen is not more than 20 percent;
and step seven, putting the mixed material obtained in the step three and the activating agent in the step five into a stirrer together, stirring for 8min at the rotating speed of 48r/min, and obtaining the concrete composite admixture.
The performance of the concrete composite admixture is as follows: slump: 215mm, compressive strength 1 d: 20.3 MPa; 3 d: 22.7 MPa; 7 d: 28.6 MPa; 14 d: 35.7 MPa; 28 d: 48.1 MPa.
Example 2:
the concrete composite admixture comprises the following raw materials in parts by mass:
58 parts of silicon micropowder, 20 parts of fly ash, 20 parts of limestone powder, 15 parts of steel slag powder, 12 parts of tuff powder and 8 parts of activating agent.
The silicon micropowder is prepared from quartzite through crushing, grinding and other processes, and SiO2The content is more than 90 percent.
The activating agent comprises the following raw materials in parts by mass: 8 parts of hydrated lime, 3 parts of sodium sulfate, 8 parts of sodium silicate, 22 parts of calcium sulfate, 1 part of an amide mixture, 0.5 part of cellulose ether, 1.2 parts of acrylic acid, 2 parts of epoxy resin, 1.0 part of a dispersing agent and 26 parts of water.
The amide mixture consists of polyacrylamide, N-N dimethylacetamide and polymethacrylamide, and the mass parts of the amide mixture are as follows: 1-3:1: 1-2.
The cellulose ether is hydroxypropyl methyl cellulose ether.
The dispersing agent is ethanol.
A preparation method of a concrete composite admixture comprises the following steps:
firstly, drying silicon micropowder, fly ash, limestone powder, steel slag powder and tuff powder for later use;
adding the amide mixture, the cellulose ether, the acrylic acid, the epoxy resin and the dispersing agent into a reaction kettle according to a ratio, stirring, and reacting for 1.5 hours under the conditions that the pressure is 4MPa and the temperature is 60 ℃;
step three, placing the mixture after the reaction in an ultrasonic generator, and treating the mixture for 40min by using 300W ultrasonic waves;
adding slaked lime, sodium sulfate, sodium silicate and calcium sulfate into water according to a proportion, and mixing and stirring the mixture and the mixture obtained in the second step for 30min to obtain an activator precursor;
placing the prepared activator precursor under strong ultraviolet light with the power of 90W and the wavelength of 150nm for treatment for 30 min;
step six, adding the materials in the step one into a ball mill according to a proportion for grinding, wherein the grinding fineness reaches Bosch specific surface area not less than 400m2Kg, or the screen allowance of a 0.08mm square-hole screen is not more than 2 percent, or the screen allowance of a 0.045mm square-hole screen is not more than 20 percent;
and step seven, putting the mixed material obtained in the step three and the activating agent in the step five into a stirrer together, stirring for 8min at the rotating speed of 48r/min, and obtaining the concrete composite admixture.
The performance of the concrete composite admixture is as follows: slump: 220mm, compressive strength 1 d: 21.8 MPa; 3 d: 24.2 MPa; 7 d: 30.7 MPa; 14 d: 38.3 MPa; 28 d: 49.7 MPa.
Example 3:
the concrete composite admixture comprises the following raw materials in parts by mass:
60 parts of silicon micropowder, 30 parts of fly ash, 30 parts of limestone powder, 20 parts of steel slag powder, 20 parts of tuff powder and 15 parts of activating agent.
The silicon micropowder is prepared from quartzite through crushing, grinding and other processes, and SiO2The content is more than 90 percent.
The activating agent comprises the following raw materials in parts by mass: 10 parts of hydrated lime, 5 parts of sodium sulfate, 10 parts of sodium silicate, 28 parts of calcium sulfate, 2 parts of an amide mixture, 0.8 part of cellulose ether, 1.4 parts of acrylic acid, 3 parts of epoxy resin, 1.5 parts of a dispersing agent and 28 parts of water.
The amide mixture consists of polyacrylamide, N-N dimethylacetamide and polymethacrylamide, and the mass parts of the amide mixture are as follows: 1-3:1: 1-2.
The cellulose ether is hydroxypropyl methyl cellulose ether.
The dispersing agent is isopropanol.
A preparation method of a concrete composite admixture comprises the following steps:
firstly, drying silicon micropowder, fly ash, limestone powder, steel slag powder and tuff powder for later use;
adding the amide mixture, the cellulose ether, the acrylic acid, the epoxy resin and the dispersing agent into a reaction kettle according to a ratio, stirring, and reacting for 1.5 hours under the conditions that the pressure is 4MPa and the temperature is 60 ℃;
step three, placing the mixture after the reaction in an ultrasonic generator, and treating the mixture for 50min by using 400W ultrasonic waves;
adding slaked lime, sodium sulfate, sodium silicate and calcium sulfate into water according to a proportion, and mixing and stirring the mixture and the mixture obtained in the second step for 30min to obtain an activator precursor;
placing the prepared activator precursor under strong ultraviolet light with the power of 100W and the wavelength of 100-200nm for treatment for 30 min;
step six, adding the materials in the step one into a ball mill according to a proportion for grinding, wherein the grinding fineness reaches Bosch specific surface area not less than 400m2Kg, or 0.08mm square mesh sieve with the balance not more than 2%, or 0.045mm square mesh sieveThe balance is not more than 20%;
and step seven, putting the mixed material obtained in the step three and the activating agent in the step five into a stirrer together, stirring at the rotating speed of 50r/min for 10min, and obtaining the concrete composite admixture.
The performance of the concrete composite admixture is as follows: slump: 216mm, compressive strength 1 d: 20.8 MPa; 3 d: 23.9 MPa; 7 d: 29.4 MPa; 14 d: 36.5 MPa; 28 d: 49.7 MPa.
The concrete composite admixtures obtained in example 1, example 2 and example 3 were compared in terms of their activities, and the following results were obtained as shown in Table 1:
table 1 comparison of activity results
| Group of | Day 1 Activity | Day 3 Activity | Day 7 Activity | Activity at day 14 | Activity at day 28 |
| Example 1 | 97.2% | 96.8% | 96.5% | 102.8% | 115.2% |
| Example 2 | 98% | 97.8% | 97.3% | 105.6% | 118.5% |
| Example 3 | 97.5% | 97.2% | 96.6% | 103.4% | 116.4% |
The performance of the admixture is excellent, and the main reason is that the activator component has strong pertinence. Wherein, the calcium sulfate supplements sulfate radicals in the composite admixture in a targeted manner, and the setting time and the workability of the composite admixture are adjusted to ensure the construction performance of the concrete. The hydrated lime keeps the whole composite admixture in an alkaline environment so as to be convenient for storage and adapt to the alkaline environment of concrete. Sodium silicate is grinding aid, promotes the grinding efficiency of overall process. The amide mixture is a rust inhibitor and can delay the corrosion of the steel bar when being applied to reinforced concrete. The epoxy resin is a cohesive agent and a thickening agent, and keeps the cohesiveness of the concrete.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. The concrete composite admixture is characterized in that: the concrete composite admixture comprises the following raw materials in parts by mass:
50-60 parts of silicon micropowder, 15-30 parts of fly ash, 15-30 parts of limestone powder, 10-20 parts of steel slag powder, 8-20 parts of tuff powder and 5-15 parts of activating agent;
the activating agent comprises the following raw materials in parts by mass: 2-10 parts of hydrated lime, 1-5 parts of sodium sulfate, 4-10 parts of sodium silicate, 10-30 parts of calcium sulfate, 0.5-2 parts of amide mixture, 0.2-0.8 part of cellulose ether, 0.5-1.5 parts of acrylic acid, 1-3 parts of epoxy resin, 0.2-1.5 parts of dispersant and 15-30 parts of water.
2. The concrete admixture as set forth in claim 1, wherein: the concrete composite admixture comprises the following raw materials in parts by mass:
58 parts of silicon micropowder, 20 parts of fly ash, 20 parts of limestone powder, 15 parts of steel slag powder, 12 parts of tuff powder and 8 parts of activating agent.
3. The concrete admixture as set forth in claim 1, wherein: the silicon micropowder is prepared from quartzite through crushing, grinding and other processes, and SiO2The content is more than 90 percent.
4. The concrete admixture as set forth in claim 1, wherein: the amide mixture consists of polyacrylamide, N-N dimethylacetamide and polymethacrylamide, and the mass parts of the amide mixture are as follows: 1-3:1: 1-2.
5. The concrete admixture as set forth in claim 1, wherein: the cellulose ether is hydroxypropyl methyl cellulose ether.
6. The concrete admixture as set forth in claim 1, wherein: the dispersant is one of methanol, ethanol, isopropanol, ethylene glycol and propylene glycol.
7. The method for preparing a concrete composite admixture according to any one of claims 1 to 6, wherein: the preparation method comprises the following steps:
firstly, drying silicon micropowder, fly ash, limestone powder, steel slag powder and tuff powder for later use;
adding the amide mixture, the cellulose ether, the acrylic acid, the epoxy resin and the dispersing agent into a reaction kettle according to a ratio, stirring, and reacting for 1.5 hours under the conditions that the pressure is 4MPa and the temperature is 60 ℃;
step three, placing the mixture after the reaction in an ultrasonic generator, and treating the mixture for 30-60min by using 200-500W ultrasonic waves;
adding slaked lime, sodium sulfate, sodium silicate and calcium sulfate into water according to a proportion, and mixing and stirring the mixture and the mixture obtained in the second step for 30min to obtain an activator precursor;
placing the prepared activator precursor under strong ultraviolet light with the power of 80W-100W and the wavelength of 100-200nm for treatment for 30 min;
step six, adding the materials in the step one into a ball mill according to a proportion for grinding, wherein the grinding fineness reaches Bosch specific surface area not less than 400m2Kg, or the screen allowance of a 0.08mm square-hole screen is not more than 2 percent, or the screen allowance of a 0.045mm square-hole screen is not more than 20 percent;
and step seven, putting the mixed material obtained in the step three and the activating agent in the step five into a stirrer together, stirring at the rotating speed of 45-50r/min for 5-10min, and obtaining the concrete composite admixture.
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| CN115557765B (en) * | 2022-09-19 | 2023-09-12 | 江苏中建商品混凝土有限公司 | Limestone powder composite admixture and preparation method and application thereof |
| CN116924704A (en) * | 2023-07-19 | 2023-10-24 | 浙江福瑞再生资源开发股份有限公司 | Prefabricated stainless steel slag, cement setting material prepared from prefabricated stainless steel slag and lime plastic material |
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