CN112209646A - High-performance pre-dispersed silica mortar and preparation method thereof - Google Patents
High-performance pre-dispersed silica mortar and preparation method thereof Download PDFInfo
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- CN112209646A CN112209646A CN202011086887.2A CN202011086887A CN112209646A CN 112209646 A CN112209646 A CN 112209646A CN 202011086887 A CN202011086887 A CN 202011086887A CN 112209646 A CN112209646 A CN 112209646A
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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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- 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 high-performance pre-dispersed silica fume slurry and a preparation method thereof; 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: (1) preparing a functional dispersion liquid; (2) weighing the silica fume and the dispersion liquid according to the proportion; (3) carrying out high-speed mechanical cavitation dispersion on the mixture of the silica fume and the dispersion liquid; (4) dispersing for a specified time to obtain the high-performance pre-dispersed silica mortar. According to the high-performance pre-dispersed silica mortar prepared by the method, silica fume aggregates are effectively dissociated into single particles or slight aggregates, so that the dispersibility and the pozzolanic activity of silica fume are greatly improved, and the concrete prepared from the silica fume mortar has the advantages of good workability, small workability loss and high strength. The silicon mortar has no delayed coagulation component, does not influence the coagulation hardening of concrete, has obvious early strength and steam curing early strength characteristics, is particularly suitable for preparing prefabricated parts, can greatly shorten the curing time, reduce the curing energy consumption, save the material cost and has better performance.
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 mortar applied to concrete, in particular to 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 processed by the compressed air through the special encryption equipmentTo form the agglomerated silica fume with micron-sized or even millimeter-sized particles. 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 slurry cavitation effect 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, the beneficial effects of spherical submicron-level high-activity admixture of silica fume on the aspects of workability, strength and durability cannot be fully exerted, the effects of early strength, early steam curing and the like are hardly achieved, and the performance of the prepared silica fume slurry is limited.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the high-performance pre-dispersed silica mortar and the preparation method thereof, which can effectively solve the problems of high silica mortar concrete viscosity, low initial workability, large workability loss, low steam-curing demolding strength, limited strength increase and the like 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.
In order to achieve the purpose, the technical scheme adopted by the invention for solving the technical problems is as follows:
a high-performance pre-dispersed silica mortar, which 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 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 is characterized in that the silica fume comprises raw ash, semi-dense silica fume and high-dense silica fume; the silicon ash source comprises metal silicon smelting smoke dust and ferrosilicon smelting smoke dust.
The high-performance pre-dispersed silica mortar according to the present invention is characterized in that: the preparation method of the concrete by using the high-performance pre-dispersed silica mortar 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.
A preparation method of high-performance pre-dispersed silica mortar is characterized by comprising 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 the slurry obtained after dispersion is the high-performance pre-dispersed silica mortar.
The invention has the beneficial effects that:
1. the silica fume slurry has no obvious delayed coagulation component, no delayed influence, low demolding strength, low early strength and other negative effect on the coagulation and hardening of silica fume concrete, especially steam cured silica fume concrete, and can fully utilize the early activity of silica fume, raise the silica fume activity exciting effect under the condition of steam curing and standard curing and raise the early and later strength.
2. The high-speed mechanical cavitation dispersion is adopted, the high-efficiency dissociation and dispersion of the silica fume aggregate are realized by the cavitation effect, the dispersion time is greatly shortened, the dissociation degree of the silica fume aggregate is high, the dispersion effect is good, meanwhile, the stability and the dispersibility of the dissociated and dispersed submicron silica fume particles in the silica fume slurry are maintained by the non-delayed functional dispersant, the volcanic ash activity of the silica fume at each age can be fully exerted, and the negative effects of poor concrete workability, large workability loss, high concrete viscosity, low strength and the like caused by the silica fume aggregate are reduced. The prepared silica-mortar concrete has the advantages of good initial workability, small time loss and low viscosity, and the early and later strength of the concrete is obviously increased.
Drawings
FIG. 1 shows the results of laser particle size distribution measurements of various silica fume slurries.
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.
Example 1: a high-performance pre-dispersed silica mortar comprises; 1 part of silica fume, 1 part of water and the composition of the functional dispersant 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.
And (3) mechanically cavitating and dispersing the mixture of the silica fume and the functional dispersion liquid by using a high-speed dispersion machine, wherein the linear velocity of a dispersion blade is 45m/s, and the dispersion time is 3min, so that the No. 1 high-performance pre-dispersed silica mortar is obtained.
Example 2: a high-performance pre-dispersed silica mortar comprises; 1 part of silica fume, 1.5 parts of water and the composition of the functional dispersant is as follows: 0.001 part of sodium dodecyl sulfate; 0.001 part of sodium thiosulfate; 0.00003 part of fluorine interfacial tension regulator and 0.001 part of modified polysiloxane.
And (3) mechanically cavitating and dispersing the mixture of the silica fume and the functional dispersion liquid by using a high-speed dispersion machine, wherein the linear velocity of a dispersion blade is 35m/s, and the dispersion time is 2min, so that the No. 2 high-performance pre-dispersed silica mortar is obtained.
Example 3: a high-performance pre-dispersed silica mortar comprises; 1 part of silica fume, 2 parts of water and the composition of the functional dispersant is as follows: 0.01 part of polyethylene glycol with the molecular weight of 200; 0.03 part of sodium bicarbonate; 0.01 part of propylene glycol.
And (3) mechanically cavitating and dispersing the mixture of the silica fume and the functional dispersion liquid by using a high-speed dispersion machine, wherein the linear velocity of a dispersion blade is 30m/s, and the dispersion time is 5min, so that the No. 3 high-performance pre-dispersed silica mortar is obtained.
Example 4: a high-performance pre-dispersed silica mortar comprises; 1 part of silica fume, 2.5 parts of water and the composition of the functional dispersant is as follows: 0.003 part of dipropylene glycol methyl ether; 0.01 part of potassium bicarbonate; the doping amount of the fluorine interfacial tension regulator is 0.00002 part of the mass of the silica fume.
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 25m/s, and the dispersion time is 8min, so as to obtain No. 4 high-performance pre-dispersed silica mortar.
Comparative example:
no. 0 of silica mortar which was dispersed by ordinary medium-low-speed stirring without adding a dispersant, and No. 00 of silica mortar which was dispersed by ordinary medium-low-speed mechanical stirring with adding 0.001 part of sodium pyrophosphate as a dispersant.
And (3) detection: the above samples were subjected to laser particle size testing, the results of which are shown in table 1 and fig. 1.
TABLE 1 laser particle size test results for different silica fume slurries
| Sample name | Dx(10)(μm) | Dx(50)(μm) | Dx(90)(μm) |
| 0# conventional stirred Dispersion | 0.31 | 53.9 | 224 |
| 00# conventional stirring dispersion plus dispersing agent | 0.252 | 13.6 | 125 |
| High speed cavitation dispersion of # 1 | 0.116 | 0.255 | 0.574 |
| 2# high speed cavitation dispersion | 0.149 | 0.349 | 7.89 |
| 3# high speed cavitation dispersion | 0.144 | 0.369 | 7.62 |
The data in Table 1 show that the silica fume slurry obtained by high-speed cavitation dispersion has a great reduction in the silica fume particle size in the dispersion, 53.9um when the slurry is stirred conventionally without dispersant, 13.6um when the slurry is stirred conventionally with dispersant, and less than 0.4um when the slurry is dispersed by high-speed cavitation with dispersant.
The particle size distribution curve of fig. 1 also shows that the high speed cavitation dispersed sample has a much higher proportion of particles with particle sizes below 1um than the conventional agitation dispersed sample and a much lower proportion of particles above 1um than the conventional agitation dispersed sample, indicating that the silica fume agglomerates are effectively dissociated into smaller agglomerates or single particles by the high speed cavitation dispersion.
The silica fume slurry is added into C30 and C60 concrete according to the mixing proportion shown in table 2, wherein the silica fume mixing amount after water is subtracted is 5%, the steam curing system is static for 1h, the temperature is increased for 1.5h, the constant temperature is 50 ℃ for 5h, and the temperature is reduced for 1 h. The concrete performance test results are as follows:
TABLE 2C 30, C60 concrete mixing ratio (kg/m)3)
TABLE 3C 30 concrete Properties of silica fume and silica mortar admixtures
| Sample numbering | Standard culture 18h strength MPa | Steam-curing strength demoulding MPa | Standard culture 28d strength MPa |
| Blending ofSilica fume | 11.3 | 18.2 | 43.8 |
| Slurry doped with No. 0 | 12.7 | 19.9 | 45.1 |
| Slurry mixed with No. 00 | 5.1 | 9.8 | 47.5 |
| Slurry doped with No. 1 | 19.8 | 26.2 | 49.4 |
| Slurry mixed with No. 2 | 18.4 | 24.0 | 48.9 |
| Slurry doped with No. 3 | 17.1 | 23.5 | 48.3 |
TABLE 4C 60 concrete Properties of silica fume and silica mortar admixtures
The data in tables 3 and 4 show that the concrete prepared from the silica mortar obtained by high-speed cavitation dispersion has lower and higher early strength and steam curing demolding strength, and the strength of standard curing 28d is also obviously higher than that of the concrete prepared from the mortar without high-speed cavitation dispersion. Among them, in C60 concrete doped with silica fume and silica mortar, the high-performance pre-dispersed silica mortar concrete with high speed dispersion has lower slump cone time, which shows that the concrete has lower viscosity.
The examples and test results prove that the method can more efficiently realize the dissociation and dispersion of the silica fume aggregate through high-speed mechanical cavitation dispersion, and has good dispersion effect; meanwhile, the adopted non-delayed coagulation functional dispersant ensures that the silica fume slurry has the characteristic of no delayed coagulation. Under the action of the two aspects, the early activity of the silica fume can be fully exerted, the excitation effect of the silica fume activity under the conditions of steam curing and standard curing is improved, and the early strength and the later strength are improved.
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 (7)
1. A high-performance pre-dispersed silica mortar, which 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.
2. The high performance pre-dispersed silica mortar of claim 1, 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.
3. The high performance pre-dispersed silica mortar of claim 1, 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.
4. The high performance pre-dispersed silica mortar of claim 1, 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.
5. The high performance pre-dispersed silica mortar of claim 1, wherein the silica fume comprises raw ash, semi-dense silica fume, high dense silica fume; the silicon ash source comprises metal silicon smelting smoke dust and ferrosilicon smelting smoke dust.
6. The high performance pre-dispersed silica mortar of claim 1, wherein: the preparation method of the concrete by using the high-performance pre-dispersed silica mortar 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.
7. A preparation method of high-performance pre-dispersed silica mortar is characterized by comprising 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.
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| 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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| 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 |
| CN117164276B (en) * | 2023-11-03 | 2024-01-05 | 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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Application publication date: 20210112 |