CN110563377B - Compound type wet-grinding concrete waste residue functional additive and application thereof - Google Patents
Compound type wet-grinding concrete waste residue functional additive and application thereof Download PDFInfo
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- CN110563377B CN110563377B CN201910935042.7A CN201910935042A CN110563377B CN 110563377 B CN110563377 B CN 110563377B CN 201910935042 A CN201910935042 A CN 201910935042A CN 110563377 B CN110563377 B CN 110563377B
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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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Abstract
The invention discloses a compound wet-grinding concrete waste residue functional additive and application thereof, wherein the compound wet-grinding concrete waste residue functional additive comprises the following components in parts by weight: 160 portions of grinding aid component 140, 160 portions of dispersing component 140, 60 to 80 portions of retarding component, 10 to 20 portions of early strength component and 180 portions of water. The functional assistant is specially designed for concrete waste residues, has multiple functions of grinding aid, dispersion, slump retention (slow setting), early strength and the like, is liquid at normal temperature, is low in mixing amount and is environment-friendly. When the additive is used for wet grinding of concrete waste residues, the wet grinding efficiency can be effectively improved, the obtained waste residue slurry is uniformly and stably dispersed, has high particle fineness, is easy to store and convey while having high activity, can effectively improve the early strength and the working performance of concrete after being used for producing the concrete instead of an admixture, and has high engineering application value.
Description
Technical Field
The invention belongs to the field of functional building material functional additives, and particularly relates to a compound wet-grinding concrete waste residue functional additive and application thereof.
Background
In the solid waste treatment process, a drying and grinding mode is generally used for treatment and reactivation, the defects of high energy consumption, low efficiency and the like exist in the traditional mechanical grinding, the high surface energy state easily causes particle agglomeration in the dry grinding process, the grinding limit is only 6-8 um, and the exertion of the admixture effect is limited. Compared with the traditional mechanical grinding, the stirring mill wet grinding mode does not need to dry the water in the industrial waste residue, the water in the waste residue can also play a role of grinding aid, and the surface energy of the blended material is reduced so as to improve the wet grinding efficiency. From the aspects of economy, energy conservation and particle effect, various scholars generally consider that the wet method is obviously superior to the dry method grinding process, and the wet method can reduce energy consumption while improving the activity of powder. However, in order to improve the activity of the slurry during wet grinding, a large amount of ultrafine particles are generated, which have extremely large specific surface area and surface energy, and such unstable particles are easy to agglomerate during processing and use to form secondary particles and settle, and the activity is reduced, thereby seriously affecting the subsequent use process.
At present, less functional auxiliary agents are used for wet grinding of concrete waste residues, more dispersing agents are used, and the wet grinding dispersing agents mainly have the problems that the inorganic dispersing agents are insufficient in space resistance and cannot form stable dispersing structures, and when the molecular weight of the high molecular polymer dispersing agents is too large, the high molecular polymer dispersing agents are poor in adsorption effect and easy to generate flocculation and agglomeration effects, so that the viscosity is increased, and the energy consumption in the wet grinding process is increased. In addition, the addition of a simple dispersant may also affect the performance of the concrete to some extent, such as setting time, early strength, slump, and slump loss. Therefore, the compound wet-grinding concrete waste residue functional additive with the functions of grinding aid, dispersion, slump retention (retardation), early strength and the like becomes one of essential components in the wet grinding process.
Patent CN107602774A discloses an ether amphoteric polycarboxylic acid dispersant for wet-milling wet fly ash and a preparation method thereof, which is characterized in that: the ether amphoteric polycarboxylic dispersant comprises the following components in parts by weight except water: polyether macromonomer: 330-350 parts of sodium methallyl sulfonate: 0.5-3.0 parts of hydrogen peroxide: 1.5-5.0 parts of ammonium persulfate: 0.5-1.5 parts of initiator: 100.8-153 parts, small monomer solution: 65.5-112 parts of sodium hypophosphite monohydrate: 0.5-2.0 parts of liquid alkali: 5-15 parts. The main anchoring groups of the dispersant in the patent are quaternary amine, quaternary phosphine, sulfonic group, phosphoric group and carboxylic group multi-element composite, when the dispersant is used for wet grinding and dispersing other material systems such as alkaline concrete waste residue, the anchoring structure is various but not strong in pertinence, and the inorganic salt ions brought along with the anchoring structure can influence the unfolding of a solvent chain and reduce the steric hindrance effect. In addition, a single dispersing agent has limited grinding aiding effect, cannot completely excite the activity of materials, cannot ensure the adaptability of the slurry after dispersion and wet grinding in the production of concrete, and has limited improvement of the use value of the wet grinding slurry due to the single function.
Disclosure of Invention
The invention mainly aims to provide a compound wet-grinding concrete waste residue functional auxiliary agent and application thereof, aiming at the defects in the prior art. The functional assistant is used for wet grinding of concrete waste residues, is in a liquid state at normal temperature, is low in doping amount and environment-friendly, can effectively improve the wet grinding efficiency, forms uniform and stable water dispersion activated waste residue slurry while reducing the fineness of the concrete waste residues, is high in activity of the waste residue slurry, is easy to produce, and can effectively improve the working performance of the concrete when being used for concrete.
In order to solve the technical problems, the invention adopts the following technical scheme:
a compound wet grinding concrete waste residue functional additive comprises the following raw materials in parts by weight: 155 portions of grinding aid component 145-155 portions, 155 portions of dispersing component 145-155 portions, 65-75 portions of retarding component, 12-18 portions of early strength component and 175 portions of water 165-155 portions; the grinding aid component is an alcamine substance, the dispersing component is one or two compositions of water-soluble nonionic waterborne polyurethane, and the molecular weight is 3000-5000; the retarding component is a saccharide retarder; the early strength component is an inorganic salt activity excitant.
The concrete waste residue is waste concrete, slurry for cleaning a pouring truck and slurry after aggregate such as sand and stone is removed from the waste residue, and has certain activity.
According to the scheme, the grinding aid component is one or a combination of two of diethanol monoisopropanolamine, triethanolamine and triisopropanolamine; the composition of the diethanol monoisopropanolamine and the triethanolamine is preferred, wherein the mass ratio of the diethanol monoisopropanolamine to the triethanolamine is 1 (1.5-2.5). The selected grinding aid component is an alcamine substance with grinding aid and early strength effects.
According to the scheme, the dispersing component is at least one of a single-ended bishydroxy polyethylene glycol-isophorone diisocyanate copolymer and a single-ended bishydroxy polyethylene glycol-isophorone diisocyanate-dimethylolpropionic acid copolymer, and the copolymer composition with the mass ratio of 1 (0.5-1.5) is preferred.
The preferable dispersing agent stabilizes the concrete waste residue through the anchoring effect of cyanate ester and carboxylate ionic groups, and stabilizes a slurry system through the steric hindrance effect of a solvation chain segment and an electric double layer generated after anchoring.
According to the scheme, the retarding component is one or two of glucose, sucrose and derivatives thereof, and molasses and derivatives thereof, and the molasses and the sucrose are preferably selected according to the mass ratio of 1 (0-0.5).
According to the scheme, the early strength component is at least one of nitrite and silicate, preferably a composition of calcium nitrate and sodium silicate, wherein the mass ratio of the calcium nitrate to the sodium silicate is 1 (1.5-2.5).
The preparation method of the compound wet-grinding concrete waste residue functional auxiliary agent comprises the steps of sequentially adding a grinding aid component, a dispersing component, a retarding component, an early strength component and water into a reaction kettle according to parts by mass, and uniformly mixing.
The application of the compound wet-grinding concrete waste residue functional auxiliary in concrete waste residue is provided, and specifically, the functional auxiliary is doped into the concrete waste residue in an amount of 1-2% in percentage by weight.
The compound wet grinding concrete waste residue functional additive obtained by the invention is activated together by a plurality of modes, such as: grinding refinement, alcohol amine substance activation, inorganic salt activation and the like, the activity of the concrete waste residue is activated to the utmost extent, and the applicability of the slurry after wet grinding in concrete reproduction is improved.
The invention has the beneficial effects that:
1. the compound wet-grinding concrete waste residue functional additive is specially designed for concrete waste residues, has multiple functions of grinding aid, dispersion, slump retaining (slow setting), early strength and the like, effectively improves the grinding aid efficiency and simultaneously reduces the viscosity of waste residue slurry; the potential activity of the concrete waste residue is comprehensively activated by using a grinding aid with an early strength effect, reducing the fineness, improving the surface energy, adding an early strength activator and the like; the retarding component can effectively ensure the adaptability of the waste residue slurry and the concrete admixture, and the stable, high-efficiency and high-applicability nonionic polymer dispersant is synchronously used to improve the working performance and the processing performance of the waste residue slurry.
2. The compound wet-grinding concrete waste residue functional auxiliary agent provided by the invention is strong in pertinence, is in a liquid state at normal temperature, is low in doping amount and is environment-friendly; when the slurry is used for wet grinding of concrete waste residues, the wet grinding efficiency can be effectively improved, the obtained waste residue slurry is uniformly and stably dispersed, has extremely high particle fineness, is easy to store and convey while having extremely high activity, can effectively improve the early strength and the working performance of concrete after being used for concrete production instead of admixture, and has high engineering application value.
3. The preparation method of the compound wet-milled concrete waste residue functional additive provided by the invention has the advantages that the whole production link is nontoxic and free of pungent smell, the preparation process only needs simple physical mixing, the preparation method is simple and efficient, the prepared functional additive can be suitable for various complex raw material conditions, the mixing amount is small, and the cost is low; in addition, the product types can be expanded by adjusting the formula, the raw material cost is controlled, and the method is mainly applied to different waste residue slurry production conditions.
Detailed Description
The following examples further illustrate the invention in order that it may be better understood. However, the present invention is not limited to the following examples.
Examples 1 to 3 and comparative examples 1 to 3
A compound wet grinding concrete waste residue functional auxiliary agent comprises the components and the mass parts of the components are referred to table 1, and the concrete preparation steps are as follows: adding a grinding aid component, a dispersing component, a retarding component, an early strength component and water into a reaction kettle in sequence according to parts by mass, and uniformly mixing.
The grinding aid component is a composition of diethanol monoisopropanolamine and triethanolamine in a mass ratio of 1: 2;
the dispersion components are a single-ended bishydroxy polyethylene glycol-isophorone diisocyanate copolymer and a single-ended bishydroxy polyethylene glycol-isophorone diisocyanate copolymer in a mass ratio of 1:1, and the molecular weights of the polymers are 3000-5000.
The retarding component is molasses;
the early strength component is a composition of calcium nitrate and sodium silicate with the mass ratio of 1: 2.
The specific performance test results of the obtained functional additive are shown in Table 2, and the performance test results of the wet-grinding waste residue slurry are shown in Table 3.
Comparative example 4
The inorganic salt dispersant is prepared from the following components in a mass ratio of 1:2 sodium tripolyphosphate and water glass mixture.
The specific performance test results of the obtained functional additive are shown in Table 2, and the performance test results of the wet-grinding waste residue slurry are shown in Table 3.
Comparative example 5
The polycarboxylic acid type dispersant is DCA-9490 high-molecular block copolymer.
The specific performance test results of the obtained functional additive are shown in Table 2, and the performance test results of the wet-grinding waste residue slurry are shown in Table 3.
TABLE 1 Components and parts by mass thereof in examples 1 to 3 and comparative examples 1 to 3
TABLE 2 Performance test of concrete slag after wet milling with the functional assistant obtained in examples 1 to 3 and comparative examples 1 to 5
Table 3 Performance test of the wet-milled sludge slurry obtained in correspondence with Table 2 in concrete
Specific performance test reference standards are as follows:
the fineness and the slurry viscosity of the concrete waste residue after wet grinding by using the functional additives obtained in the above examples 1-3 and comparative examples 1-5 are tested by adopting a method of standing and ageing a slurry viscosity measuring cylinder.
The concrete trial forming is operated according to the requirements of 'common concrete mix proportion design technical specification' JGJ/T55-2011. The wet-milled concrete waste slag slurry, the ordinary portland cement, the sand, the stone, the water and the additives are weighed according to the test mixture ratio, and the test mixture ratio is shown in the following table 4.
TABLE 4 test mix proportions
The 28d/56d compressive strength adopts GB/T50081-2002 Standard for testing mechanical properties of common concrete.
The slump adopts GB/T50080-2016 Standard test method for common concrete mixture Performance.
As can be seen from Table 2, the results of examples 1 to 3, compared with comparative examples 1 to 5, show that the fineness of the concrete waste after wet grinding is significantly reduced and the viscosity is significantly increased, indicating that the grinding aid components and the dispersing components effectively prevent the sedimentation and agglomeration of the waste particles during the wet grinding.
As can be seen from Table 3, compared with comparative examples 1 to 5, examples 1 to 3 show that after the compound wet-milled concrete waste residue functional additive obtained in examples 1 to 3 is subjected to wet milling, the concrete waste residue slurry has extremely high activity, which is obviously superior to the modes of simply adding a dispersing agent, simply adding a grinding aid and the like, and the synergistic effect is generated among the components to jointly improve the performance of concrete. In addition, the compound functional auxiliary agent also improves the adaptability of the concrete waste residue slurry and the additive to a certain extent, and effectively improves the slump of concrete.
It is apparent that the above embodiments are only examples for clearly illustrating and do not limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications are therefore intended to be included within the scope of the invention as claimed.
Claims (7)
1. The compound wet-grinding concrete waste residue functional additive is characterized by comprising the following components in parts by mass: 155 portions of grinding aid component 145-155 portions, 155 portions of dispersing component 145-155 portions, 65-75 portions of retarding component, 12-18 portions of early strength component and 175 portions of water 165-155 portions; the grinding aid component is a composition of diethanol monoisopropanolamine and triethanolamine, the dispersing component is a composition of a single-ended bishydroxy polyethylene glycol-isophorone diisocyanate copolymer and a single-ended bishydroxy polyethylene glycol-isophorone diisocyanate-dimethylolpropionic acid copolymer, and the molecular weight of the dispersing component is 3000-5000; the retarding component is a saccharide retarder; the early strength component is a composition of calcium nitrate and sodium silicate.
2. The compound wet-grinding concrete waste residue functional additive according to claim 1, wherein the mass ratio of diethanol monoisopropanolamine to triethanolamine in the grinding aid components is 1 (1.5-2.5).
3. The compound wet-grinding concrete waste residue functional additive according to claim 1, wherein the dispersing component is a composition of a single-ended bishydroxy polyethylene glycol-isophorone diisocyanate copolymer and a single-ended bishydroxy polyethylene glycol-isophorone diisocyanate-dimethylolpropionic acid copolymer, and the mass ratio of the two copolymers is 1 (0.5-1.5).
4. The compound wet-milled concrete slag functional additive according to claim 1, wherein the retarding component is one or two of glucose, sucrose and derivatives thereof, and molasses and derivatives thereof.
5. The compound wet-grinding concrete waste residue functional additive as claimed in claim 4, wherein the retarding component comprises molasses and cane sugar in a mass ratio of 1 (0-0.5).
6. The compound functional assistant for wet-milled concrete waste residue according to claim 1, wherein the mass ratio of calcium nitrate to sodium silicate in the early strength component is 1 (1.5-2.5).
7. The application of the compound wet-grinding concrete waste residue functional additive disclosed by any one of claims 1-6 in concrete waste residue is characterized in that the functional additive is doped into the concrete waste residue in an amount of 1-2% in percentage by weight.
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