CN112225503A - High-performance pre-dispersed silica mortar concrete and preparation method thereof - Google Patents
High-performance pre-dispersed silica mortar concrete and preparation method thereof Download PDFInfo
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- CN112225503A CN112225503A CN202011086031.5A CN202011086031A CN112225503A CN 112225503 A CN112225503 A CN 112225503A CN 202011086031 A CN202011086031 A CN 202011086031A CN 112225503 A CN112225503 A CN 112225503A
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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
- 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 a high-performance pre-dispersed silica mortar concrete and a preparation method thereof; the concrete comprises the following components: 60-760 parts of cement, 5-200 parts of silica mortar, 0-300 parts of other admixture, 0-150 parts of water, 1-30 parts of additive, 1000 parts of sand and 1600 parts of stone. The preparation method comprises the following steps: (1) preparing high-performance pre-dispersion silica mortar, (2) metering and adding sand, stone, cement and admixture and stirring for 0-30s, (3) metering and adding silica mortar and stirring for 5-90s, (4) adding water and admixture and stirring for 30-300s, and (5) obtaining the high-performance pre-dispersion silica mortar concrete. The method of the invention adopts the silica fume aggregate to be effectively dissociated into the dispersed slurry with smaller particles, and the prepared high-performance pre-dispersed silica fume concrete covers the concrete with various grades above C20, and has the characteristics of good workability, small loss of workability, low viscosity, good cohesiveness, no bleeding and bleeding, adjustable setting time, obviously reduced cement consumption under the same strength grade, greatly reduced cost and increased strength and durability.
Description
Technical Field
The invention belongs to the technical field of application of high-activity auxiliary cementing materials, namely silica fume, in building materials, and particularly relates to high-performance pre-dispersed silica fume slurry concrete applied to concrete, particularly early-strength and steam-cured concrete, and a preparation method thereof.
Background
The silicon ash is produced in the ore-smelting electric furnace when smelting ferrosilicon and industrial silicon (metallic silicon)2And Si gas, which is quickly oxidized, condensed and precipitated with air after being discharged. The silica fume is grey powder with fire resistance higher than 1600 deg.c, fine grain size of 0.1-1 micron, 1/50-1/100 of common cement grain, specific surface area of 15000-25000m2In terms of/kg. The main component of the silica fume is amorphous silica with the content of more than 85 percent, and the chemical components and the granularity of the silica fume determine that the silica fume is a high-activity pozzolanic admixture. The silica fume improves the macroscopic mechanical property and durability of cement mainly by promoting the hydration of cement and the filling effect of micro-aggregate, and has been widely researched and applied. The amorphous silicon dioxide particles in the silica fume consume a large amount of calcium hydroxide generated in the hydration process of the cement, and fill the microscopic pores of the concrete, thereby increasing the compactness of the concrete, improving the strength, impermeability, frost resistance and chemical corrosion resistance of the cement, and inhibiting or reducing the alkali-aggregate reaction.
However, silica fume has a problem in practical use, which is mainly manifested in that the bulk density of the non-encrypted raw silica fume subjected to dust collection is 100 to 200kg/m3The fly ash is in a loose powder state and is easy to fly, and the characteristic brings great difficulty to the transportation, storage and metering of the original-state silica fume. Therefore, most of the silica fume in the current engineering application is the silica fume which is formed by processing the original silica fume by special encryption equipment by using compressed air and is agglomerated particles at the micron level or even the millimeter level. The bulk density of the encrypted silica fume is about 400-900kg/m according to different encryption parameters3Within this range, the densified silica fume is substantially satisfactory for transportation and metering use.
The mean particle size of the densified silica fume particles is concentrated in the order of microns, even up to tens or even hundreds of microns. The problems of transportation and use caused by too low density of the original-state silica fume are solved by the encrypted silica fume, but the problem of higher agglomeration of the encrypted silica fume compared with the original-state silica fume is also caused, and the agglomerates are often difficult to effectively disperse in the conventional cement concrete preparation process. Silica fume agglomerates which are not sufficiently dispersed tend to adsorb water and additives, resulting in reduced workability and increased workability loss of concrete. After the concrete is hardened, the partially enriched coarse particle aggregate can gradually react with hydration products, such as calcium hydroxide, and the like to continuously react with alkali silicate, so that expansion cracking is caused, and the long-term strength and durability of the concrete are further influenced.
To solve the above problems, the invention "a method for producing a high fluidity silica mortar" (application No. 201510539060.5) employs a phosphoric acid-based dispersant; the invention relates to a silica fume slurry material, a preparation method and an application thereof (application No. 201310095399.1), wherein a retarder and an acidifier are adopted, wherein the acidifier is sulfuric acid or phosphoric acid; the invention relates to a post-tensioning prestressed concrete pore canal grouting agent, a preparation method thereof and a grouting material (application number 201210052813.6). The retarder is used as an essential component in the grouting material, and the anti-settling agent contains high-efficiency retarding substances such as polyether polysaccharide and the like. The dispersing agent used in the invention has obvious retardation effect, or the retardation component is directly added, so that the setting time of concrete is inevitably delayed, the early strength is influenced, and the requirements of steam-cured concrete and early-strength concrete on the setting time and the demolding strength cannot be met. On the other hand, the stirring dispersion method used in the first two inventions is only described as stirring, and no specific limitation or requirement is imposed on the mechanical stirring action, and the dispersion is achieved only by the dispersant and the conventional stirring. In the last invention, the requirements for the rotational speed of the blades are as follows: the linear velocity of the blades is limited within 20m/s, preferably controlled within 15-18 m/s, the stirring time is 10-15 min, the shearing speed is low, the effect of slurry cavitation caused by mechanical shearing cannot be achieved, only mechanical grinding and impact dispersion are taken as main points, so that the dispersion time is long, the dispersion effect is poor, the dispersion proportion of the aggregates is low, the dissociation degree of the dispersed aggregates is limited, the dispersion degree of silica fume particles in concrete is low, the negative influence caused by the aggregates is not fully avoided, and the beneficial effects of spherical submicron-grade high-activity admixture of silica fume on the aspects of workability, strength and durability cannot be fully exerted, wherein the beneficial effects comprise early strength, early steam curing and the like.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the high-performance pre-dispersed silica gel mortar concrete and the preparation method thereof, which can effectively solve the problems of poor workability, large workability loss, high viscosity, low steam-curing demolding strength, insufficient early strength and the like of the silica gel mortar concrete caused by the fact that the existing silica gel mortar dispersing agent has a retarding effect and the dispersion effect of silica gel in the mortar is poor. The cement mortar has the characteristics of adjustable setting time, obviously reduced cement consumption under the same strength grade, greatly reduced cost and increased strength and durability.
In order to achieve the purpose, the technical scheme adopted by the invention for solving the technical problems is as follows: the high-performance pre-dispersed silica mortar concrete is characterized in that: the concrete comprises the following components: 60-760 parts of cement, 5-200 parts of silica mortar, 0-300 parts of other admixture, 0-150 parts of water, 1-30 parts of additive, 1000 parts of sand and 1600 parts of stone; the mixing proportion parameter of the components is 0.16-0.5 of water-cement ratio, the consumption of the cement material is 200-800 kg/cubic meter of concrete, the folding and fixing mixing amount of the silica mortar is 2-10 percent, and the other mixing material is 0-80 percent. The preparation method comprises the following steps: (1) preparing high-performance pre-dispersion silica mortar, (2) metering and adding sand, stone, cement and admixture and stirring for 0-30s, (3) metering and adding silica mortar and stirring for 5-90s, (4) adding water and admixture and stirring for 30-300s, and (5) obtaining the high-performance pre-dispersion silica mortar concrete.
The high-performance pre-dispersed silica mortar concrete is characterized in that: the high-performance pre-dispersed silica mortar comprises the following components: 1 part of silica fume, 0.8-3 parts of water and 0-0.05 part of functional dispersant; the preparation method comprises the following steps: the preparation method comprises the steps of (1) measuring the functional dispersing agent and water according to the proportion, dissolving and preparing and measuring the functional dispersing liquid, and (2) adding the measured silica fume into the functional dispersing liquid; (3) dispersing the mixture of the silica fume and the functional dispersion liquid by high-speed mechanical cavitation; (4) and dispersing to obtain slurry, namely the high-performance pre-dispersed silica mortar.
The high-performance pre-dispersed silica mortar according to the present invention is characterized in that: the functional dispersant is composed of one or more of the following substances: comprises organic dispersing agents such as methyl amyl alcohol, lauryl sodium sulfate, dipropylene glycol methyl ether, diethylene glycol methyl ether, dipropylene glycol ethyl ether, diethylene glycol ethyl ether, dipropylene glycol propyl ether, diethylene glycol propyl ether, dipropylene glycol butyl ether, diethylene glycol butyl ether, polyethylene glycol with molecular weight of 200-2000, and the like, and the doping amount is 0-0.6 percent of the mass of the silica fume; 1-3.2 modulus of inorganic early strength dispersing agents such as potassium-sodium water glass, sodium hydroxide, potassium hydroxide, sodium thiosulfate, sodium carbonate, sodium bicarbonate, potassium carbonate, potassium bicarbonate and the like, and the mixing amount is 0-5% of the mass of the silica fume; the mixing amount of the interfacial tension regulator such as propylene glycol, triethylene glycol, fluorocarbon series, fluorine series and the like is 0-1% of the mass of the silica fume, and the mixing amount of the bubble inhibitor such as polyether, high-carbon alcohol, polysiloxane, modified polysiloxane and the like is 0-1% of the mass of the silica fume.
The high-performance pre-dispersed silica mortar according to the present invention is characterized in that: the high-speed mechanical cavitation dispersion is a high-speed dispersion machine with dispersion blades, and comprises a single-shaft dispersion machine, a multi-shaft dispersion machine, a single-blade dispersion machine and a multi-blade dispersion machine; the working parameters of the high-speed dispersion machine for carrying out high-speed cavitation dispersion are as follows: the linear velocity of the dispersing blade is higher than 20m/s, the relative shearing velocity with the slurry is not lower than 14m/s, and the dispersing time is 0.5-10 min.
The high-performance pre-dispersed silica mortar according to the present invention is characterized in that: the high-speed mechanical cavitation dispersion device also comprises a high-speed jet cavitation dispersion device, the maximum flow velocity of the slurry is not lower than 14m/s, a cavitation dispersion effect is formed, and dissociation and dispersion of the silica fume aggregate are realized.
The high-performance pre-dispersed silica mortar concrete is characterized in that: the silica fume comprises raw ash, semi-encrypted silica fume and highly encrypted silica fume; the silicon ash source comprises metal silicon smelting smoke dust and ferrosilicon smelting smoke dust.
The high-performance pre-dispersed silica mortar concrete is characterized in that: the cement is Portland cement, ordinary Portland cement or composite Portland cement.
The high-performance pre-dispersed silica mortar concrete is characterized in that: the admixture is active and inactive mineral admixture such as slag powder, phosphorous slag powder, steel slag powder, limestone powder, fly ash, composite mineral powder and the like.
The high-performance pre-dispersed silica mortar concrete is characterized in that: the admixture comprises: polycarboxylic acid series, naphthalene series, amino xanthate series and lignosulfonate series water reducing agents, wherein the folding and fixing mixing amount is 0-2 wt% of the cementing materials; sodium sulfate, sodium thiosulfate, potassium sulfate, sodium sulfite, sodium metabisulfite, zinc chloride, zinc sulfate, zinc nitrate and other viscosity and setting time regulators, wherein the solid content is 0-1% wt of the cementing material; coagulant such as sodium gluconate, phosphate, saccharide, etc., the mixing amount of the broken solid is 0 to 0.5 percent wt of the gelled material; and the folding and fixing amount of the water retention agents such as cellulose ether, polyacrylamide, gelatin and the like is 0 to 0.1 percent by weight of the cementing material.
A preparation method of high-performance pre-dispersed silica mortar concrete is characterized by comprising the following steps: the preparation method comprises the following steps: (1) preparing high-performance pre-dispersion silica mortar, (2) metering and adding sand, stone, cement and admixture and stirring for 0-30s, (3) metering and adding silica mortar and stirring for 5-90s, and (4) adding water and admixture and stirring for 30-300s to obtain the high-performance pre-dispersion silica mortar concrete.
The invention has the beneficial effects that:
1. the silica fume slurry has no obvious delayed coagulation component, has small influence on the setting time of silica fume concrete, has adjustable setting time, and particularly has the negative influences of delayed coagulation, low demolding strength and the like caused by steam curing of silica fume concrete.
2. The silica fume slurry for concrete is pre-dispersed by adopting high-speed mechanical cavitation, the dissociation and dispersion degree of silica fume aggregates is high, the dispersion time is greatly shortened, the activity of silica fume particles can be fully exerted, and the viscosity, the workability and the workability loss of concrete are improved.
3. The fully dispersed high-performance silica fume slurry is used as a high-activity admixture of the concrete to ensure that the concrete has enough strength in early, middle and later periods, and a large amount of inactive admixture is used as a filler to ensure that the concrete has enough slurry volume to ensure the workability of the concrete, so that the cement consumption in the high-performance silica fume slurry concrete is greatly reduced, the material cost and the energy consumption of the concrete are greatly saved, and the hydration heat of the concrete can be obviously reduced.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
The invention provides high-performance pre-dispersed silica mortar concrete and a preparation method thereof, which can effectively solve the problems of poor workability, large workability loss, high viscosity, low steam-curing demolding strength, insufficient early strength and the like of the silica mortar concrete caused by the fact that the conventional silica mortar dispersing agent has a retarding effect and the silica mortar has a poor dispersing effect in the mortar. The cement mortar has the characteristics of adjustable setting time, obviously reduced cement consumption under the same strength grade, greatly reduced cost and increased strength and durability. The implementation mode is as follows:
example 1:
the compounding ratio of the C20-C100 fluidized high-performance pre-dispersed silica mortar concrete is shown in Table 1, and the preparation method comprises the following steps:
a high performance pre-dispersed silica mortar with 50% solids content was prepared according to the following composition: 1 part of silica fume and 1 part of water; a high performance pre-dispersed silica mortar of 40% solids content was prepared according to the following composition: 1 part of silica fume and 1.5 parts of water. The composition of the functional dispersant of the two silicon mortar is as follows: 0.001 part of diethylene glycol butyl ether; 0.02 part of potash water glass with the modulus of 2.0; 0.000002 part of fluorocarbon interfacial tension regulator. Measuring the functional dispersant and water according to the proportion, dissolving to prepare and measure the functional dispersion liquid, and adding the silica fume into the functional dispersion liquid according to the proportion; and (3) performing mechanical cavitation dispersion on the mixture of the silica fume and the functional dispersion liquid by adopting a high-speed dispersion machine, wherein the linear velocity of a dispersion blade is 45m/s, and the dispersion time is 3min, so as to obtain the high-performance pre-dispersed silica mortar.
And (2) according to the mixing proportion shown in the table 1, adding sand, stone, cement and admixture, stirring for 10s, adding silica mortar, stirring for 10s, adding water and admixture, and stirring for 60s to obtain the C20-C100 fluidized high-performance pre-dispersed silica mortar concrete.
TABLE 1C 20-C100 fluidized high-performance predispersed silica mortar concrete mix ratio (kg/m)3)
Example 2
The formulation of C30-C80 semi-dry hard high performance pre-dispersed silica mortar concrete for prefabricated parts is shown in Table 2, and the preparation method comprises the following steps:
a high performance pre-dispersed silica mortar with 50% solids content was prepared according to the following composition: 1 part of silica fume and 1 part of water; a high performance pre-dispersed silica mortar of 40% solids content was prepared according to the following composition: 1 part of silica fume and 1.5 parts of water. The composition of the functional dispersant of the two silicon mortar is as follows: 0.001 part of dipropylene glycol methyl ether; 0.03 part of sodium bicarbonate; 0.000001 part of fluorocarbon interfacial tension regulator. Measuring the functional dispersant and water according to the proportion, dissolving to prepare and measure the functional dispersion liquid, and adding the silica fume into the functional dispersion liquid according to the proportion; and (3) performing mechanical cavitation dispersion on the mixture of the silica fume and the functional dispersion liquid by adopting a high-speed dispersion machine, wherein the linear velocity of a dispersion blade is 40m/s, and the dispersion time is 4min, so as to obtain the high-performance pre-dispersed silica mortar.
And (3) metering and adding sand, stone, cement and an admixture according to the mixing ratio in the table 2, stirring for 5s, metering and adding silica mortar, stirring for 15s, adding water and an admixture, and stirring for 90s to obtain the C30-C80 semi-dry hardness high-performance pre-dispersed silica mortar concrete.
TABLE 2C 30-C80 half dry hard silica mortar concrete mix ratio (kg/m) for prefabricated parts3)
Comparative example: c30 and C60 concrete prepared by stirring the dispersed silica mortar at a normal medium-low speed without adding a dispersant are respectively represented by 0-C30 and 0-C60; 0.001 part of sodium pyrophosphate dispersant is added to the concrete of C30 and C60 prepared by using conventional medium-low speed mechanically dispersed silica mortar, which are respectively represented by 00-C30 and 00-C60.
And (3) detection: the fluidized concrete curing system is standard curing; the workability of the semi-dry hard concrete is determined by adopting a compaction factor and referring to TB/T3275-2018 railway concrete, the steam curing system is to stand still for 1h, heat up for 1.5h, keep the temperature at 50 ℃ for 5h, cool down for 1h, and test the strength after the steam curing is finished or standard curing is carried out to a preset age.
TABLE 3C 20-C100 fluidized silica mortar concrete Properties
TABLE 4C 30-C80 half dry hard silica mortar concrete Properties for prefabricated units
| Numbering | Factor of increase in real estate | Steam curing demoulding strength | 28d strength | 60d strength |
| 9 | 1.19 | 26.2 | 49.4 | 53.1 |
| 10 | 1.21 | 31.2 | 52.9 | 56.6 |
| 11 | 1.29 | 42.1 | 68.9 | 85.1 |
| 12 | 1.28 | 53.9 | 97.2 | 104.0 |
| 13 | 1.35 | 67.9 | 111.8 | 119.6 |
| 0-C30 | 1.20 | 19.7 | 45.9 | 48.7 |
| 0-C60 | 1.27 | 38.1 | 84.5 | 87.2 |
| 00-C30 | 1.21 | 10.3 | 48.1 | 51.1 |
| 00-C60 | 1.29 | 21.9 | 82.8 | 88.3 |
The data in tables 3 and 4 show that the concrete prepared from the silica mortar obtained by high-speed cavitation dispersion has better initial workability and lower slump loss; meanwhile, the concrete has higher early strength and steam curing demolding strength, and the strength of standard curing 28d is also obviously higher than that of concrete prepared by mortar without high-speed cavitation dispersion.
According to the embodiment and the test result, the high-performance pre-dispersed silica mortar concrete prepared from the non-retarding high-performance pre-dispersed silica mortar obtained by high-speed mechanical cavitation dispersion and the preparation method thereof provided by the invention have the advantages that the viscosity, the workability and the workability loss of the concrete are improved by fully exerting the activity of silica fume, the concrete is ensured to have enough strength in early, middle and later stages, and the concrete has remarkable effects of early strength, steam curing early strength and the like in semi-dry hard concrete for products, so that the material cost and the energy consumption of the concrete can be greatly saved.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The high-performance pre-dispersed silica mortar concrete is characterized in that: the concrete comprises the following components: 60-760 parts of cement, 5-200 parts of silica mortar, 0-300 parts of other admixture, 0-150 parts of water, 1-30 parts of additive, 1000 parts of sand and 1600 parts of stone; the mixing proportion parameter of the components is 0.16-0.5 of water-cement ratio, the consumption of the cement material is 200-800 kg/cubic meter of concrete, the folding and fixing mixing amount of the silica mortar is 2-10 percent, and the other mixing material is 0-80 percent.
2. The high performance pre-dispersed silica mortar concrete according to claim 1, characterized in that: the high-performance pre-dispersed silica mortar comprises the following components: 1 part of silica fume, 0.8-3 parts of water and 0-0.05 part of functional dispersant; the preparation method comprises the steps of (1) measuring the functional dispersing agent and water according to the proportion, dissolving and preparing and measuring the functional dispersing liquid, and (2) adding the measured silica fume into the functional dispersing liquid; (3) dispersing the mixture of the silica fume and the functional dispersion liquid by high-speed mechanical cavitation; (4) and dispersing to obtain slurry, namely the high-performance pre-dispersed silica mortar.
3. The high performance pre-dispersed silica mortar of claim 2, wherein: the functional dispersant is composed of one or more of the following substances: comprises organic dispersing agents such as methyl amyl alcohol, lauryl sodium sulfate, dipropylene glycol methyl ether, diethylene glycol methyl ether, dipropylene glycol ethyl ether, diethylene glycol ethyl ether, dipropylene glycol propyl ether, diethylene glycol propyl ether, dipropylene glycol butyl ether, diethylene glycol butyl ether, polyethylene glycol with molecular weight of 200-2000, and the like, and the doping amount is 0-0.6 percent of the mass of the silica fume; 1-3.2 modulus of inorganic early strength dispersing agents such as potassium-sodium water glass, sodium hydroxide, potassium hydroxide, sodium thiosulfate, sodium carbonate, sodium bicarbonate, potassium carbonate, potassium bicarbonate and the like, and the mixing amount is 0-5% of the mass of the silica fume; the mixing amount of the interfacial tension regulator such as propylene glycol, triethylene glycol, fluorocarbon series, fluorine series and the like is 0-1% of the mass of the silica fume, and the mixing amount of the bubble inhibitor such as polyether, high-carbon alcohol, polysiloxane, modified polysiloxane and the like is 0-1% of the mass of the silica fume.
4. The high performance pre-dispersed silica mortar of claim 2, wherein: the high-speed mechanical cavitation dispersion is a high-speed dispersion machine with dispersion blades, and comprises a single-shaft dispersion machine, a multi-shaft dispersion machine, a single-blade dispersion machine and a multi-blade dispersion machine; the working parameters of the high-speed dispersion machine for carrying out high-speed cavitation dispersion are as follows: the linear velocity of the dispersing blade is higher than 20m/s, the relative shearing velocity with the slurry is not lower than 14m/s, and the dispersing time is 0.5-10 min.
5. The high performance pre-dispersed silica mortar of claim 2, wherein: the high-speed mechanical cavitation dispersion device also comprises a high-speed jet cavitation dispersion device, the maximum flow velocity of the slurry is not lower than 14m/s, a cavitation dispersion effect is formed, and dissociation and dispersion of the silica fume aggregate are realized.
6. The high performance pre-dispersed silica mortar of claim 2, wherein: the silica fume comprises raw ash, semi-encrypted silica fume and highly encrypted silica fume; the silicon ash source comprises metal silicon smelting smoke dust and ferrosilicon smelting smoke dust.
7. The high performance pre-dispersed silica mortar concrete according to claim 1, characterized in that: the cement is Portland cement, ordinary Portland cement or composite Portland cement.
8. The high performance pre-dispersed silica mortar concrete according to claim 1, characterized in that: the admixture is active and inactive mineral admixture such as slag powder, phosphorus slag powder, steel slag powder, limestone powder, fly ash, composite mineral powder and the like.
9. The high performance pre-dispersed silica mortar concrete according to claim 1, characterized in that: the admixture comprises: polycarboxylic acid series, naphthalene series, amino xanthate series and lignosulfonate series water reducing agents, wherein the folding and fixing mixing amount is 0-2 wt% of the cementing materials; sodium sulfate, sodium thiosulfate, potassium sulfate, sodium sulfite, sodium metabisulfite, zinc chloride, zinc sulfate, zinc nitrate and other viscosity and setting time regulators, wherein the solid content is 0-1% wt of the cementing material; coagulant such as sodium gluconate, phosphate, saccharide, etc., the mixing amount of the broken solid is 0 to 0.5 percent wt of the gelled material; and the folding and fixing amount of the water retention agents such as cellulose ether, polyacrylamide, gelatin and the like is 0 to 0.1 percent by weight of the cementing material.
10. A preparation method of high-performance pre-dispersed silica mortar concrete is characterized by comprising the following steps: the preparation method comprises the following steps: (1) preparing high-performance pre-dispersion silica mortar, (2) metering and adding sand, stone, cement and admixture and stirring for 0-30s, (3) metering and adding silica mortar and stirring for 5-90s, and (4) adding water and admixture and stirring for 30-300s to obtain the high-performance pre-dispersion silica mortar concrete.
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| CN116023098A (en) * | 2022-12-31 | 2023-04-28 | 四川省川铁枕梁工程有限公司 | Low-carbon high-durability concrete |
| CN117164276A (en) * | 2023-11-03 | 2023-12-05 | 四川蜀道建筑科技有限公司 | Dispersing agent for high-density silica fume, preparation method and silica fume slurry |
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