CN115572097A - Method for preparing ultra-high performance concrete admixture by using concrete waste slurry - Google Patents
Method for preparing ultra-high performance concrete admixture by using concrete waste slurry Download PDFInfo
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- 239000004567 concrete Substances 0.000 title claims abstract description 130
- 239000002699 waste material Substances 0.000 title claims abstract description 50
- 239000002002 slurry Substances 0.000 title claims abstract description 38
- 239000011374 ultra-high-performance concrete Substances 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000000243 solution Substances 0.000 claims description 75
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 61
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 39
- 238000003756 stirring Methods 0.000 claims description 36
- 239000006185 dispersion Substances 0.000 claims description 30
- 239000002245 particle Substances 0.000 claims description 22
- 239000008367 deionised water Substances 0.000 claims description 20
- 229910021641 deionized water Inorganic materials 0.000 claims description 20
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 18
- 239000003638 chemical reducing agent Substances 0.000 claims description 18
- 239000012452 mother liquor Substances 0.000 claims description 18
- 239000004115 Sodium Silicate Substances 0.000 claims description 15
- 238000002156 mixing Methods 0.000 claims description 15
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 15
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 15
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 claims description 14
- 235000010413 sodium alginate Nutrition 0.000 claims description 14
- 229940005550 sodium alginate Drugs 0.000 claims description 14
- 239000000661 sodium alginate Substances 0.000 claims description 14
- VAPQAGMSICPBKJ-UHFFFAOYSA-N 2-nitroacridine Chemical compound C1=CC=CC2=CC3=CC([N+](=O)[O-])=CC=C3N=C21 VAPQAGMSICPBKJ-UHFFFAOYSA-N 0.000 claims description 12
- 229920001732 Lignosulfonate Polymers 0.000 claims description 12
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 11
- 239000002202 Polyethylene glycol Substances 0.000 claims description 11
- 229910017604 nitric acid Inorganic materials 0.000 claims description 11
- 229920001223 polyethylene glycol Polymers 0.000 claims description 11
- 238000001914 filtration Methods 0.000 claims description 10
- 239000012535 impurity Substances 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 10
- 239000004094 surface-active agent Substances 0.000 claims description 8
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims description 6
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims description 6
- 238000010790 dilution Methods 0.000 claims description 5
- 239000012895 dilution Substances 0.000 claims description 5
- 229940117841 methacrylic acid copolymer Drugs 0.000 claims description 5
- 229920003145 methacrylic acid copolymer Polymers 0.000 claims description 5
- 239000011259 mixed solution Substances 0.000 claims description 5
- 230000007935 neutral effect Effects 0.000 claims description 5
- 238000006386 neutralization reaction Methods 0.000 claims description 5
- 238000005303 weighing Methods 0.000 claims description 5
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 4
- 239000012752 auxiliary agent Substances 0.000 claims description 3
- 230000035484 reaction time Effects 0.000 claims description 3
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 2
- -1 alkyl glycoside Chemical class 0.000 claims description 2
- 239000002518 antifoaming agent Substances 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 229930182470 glycoside Natural products 0.000 claims description 2
- 230000007797 corrosion Effects 0.000 description 16
- 238000005260 corrosion Methods 0.000 description 16
- 239000002253 acid Substances 0.000 description 8
- 230000000740 bleeding effect Effects 0.000 description 8
- 230000008014 freezing Effects 0.000 description 8
- 238000007710 freezing Methods 0.000 description 8
- 230000009467 reduction Effects 0.000 description 6
- 239000011440 grout Substances 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 239000004568 cement Substances 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000004574 high-performance concrete Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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Classifications
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to the technical field of buildings, in particular to a method for preparing an ultra-high performance concrete admixture by using waste concrete slurry.
Description
Technical Field
The invention relates to the technical field of buildings, in particular to a method for preparing an ultra-high performance concrete admixture by utilizing concrete waste slurry.
Background
The commercial concrete production process can produce a large amount of discarded grout, it mainly includes in the production washes the mixer, a large amount of discarded grout water that produces behind the transport vechicle, contain cement in the mud, aggregate, additive etc., it is a concrete waste material, at present because the disappearance on the difference of technique and management, and manufacturing enterprise's environmental protection consciousness is not strong, lead to discarded grout to discharge the processing at will, it all occupies a large amount of lands to stack the burying, and the waste grout is the strong alkaline material, it is very big to destroy soil, so both destroyed the environment, the waste of a large amount of water resources has also been caused, the enterprise need undertake the refuse treatment expense in handling discarded grout simultaneously, lead to the cost greatly increased of concrete production.
At present, the utilization of the waste slurry is mainly to use the precipitated waste water for preparing concrete, and the waste slurry is also directly used for producing the concrete, so that the cost is saved, the waste utilization is realized, the utilization of wastes is realized to a certain extent, the discharge of the waste slurry is reduced, and certain economic, social and environmental benefits are achieved.
Disclosure of Invention
The invention aims to provide a method for preparing an ultra-high performance concrete admixture by using waste concrete slurry, and aims to solve the technical problems that in the prior art, in a mode of applying the waste concrete slurry after treatment as a mineral admixture to high-strength high-performance concrete, the early strength of the concrete is reduced after the waste concrete slurry is doped due to a certain retardation effect, and the overall strength of the concrete is also reduced.
In order to achieve the above object, the present invention provides a method for preparing an ultra-high performance concrete admixture using concrete waste slurry, comprising the steps of:
the method comprises the following steps: firstly, dissolving a methacrylic acid copolymer in water, dropwise adding sodium hydroxide to adjust the pH value of the solution to 11-12 to obtain a solution A for later use, then adding a surfactant into the concrete waste slurry, stirring and ultrasonically dispersing, dropwise adding a mixed solution of nitric acid and ferric chloride to perform a neutralization reaction until the solution is neutral, and then filtering to obtain an impurity I and a solution B;
step two: placing the impurity I in a closed container with a feeding pipe, adding a second batch of nitric acid solution, injecting hydrofluoric acid solution into the container, continuously and slowly stirring, slowly injecting sodium hydroxide solution into the closed container after reacting for a period of time, continuously stirring to adjust the pH value of the solution to 12-14, and filtering out particles to obtain a solution C;
step three: weighing 35-40 parts of water reducer mother liquor by weight, adding 22-26 parts of first deionized water for dilution, uniformly stirring to prepare a first dispersion, mixing 7-9 parts of sodium silicate, 3-5 parts of sodium alginate, 4-6 parts of lignosulfonate and 3-4 parts of potassium acrylate, adding 15-20 parts of second deionized water and polyethylene glycol, and uniformly stirring to prepare a second dispersion;
step four: and adding the solution A, the solution B, the solution C, the first dispersion liquid and the second dispersion liquid into a mixing device, uniformly mixing, adding other auxiliaries, and uniformly stirring to obtain the ultra-high performance concrete admixture.
Wherein the surfactant is any one of sodium dodecyl sulfate, polyethylene glycol and alkyl glycoside.
Wherein, in the step one, the time for stirring and ultrasonic dispersion is 1-2h.
Wherein, in the second step, hydrofluoric acid solution is injected into the container, and the reaction time after continuous slow stirring is 6-8h.
In the third step, the sum of the amount of the sodium silicate and the amount of the sodium alginate does not exceed 20-40% of the mother liquor of the water reducing agent.
Wherein, in the second step, the mass concentration of the sodium hydroxide solution is 20-45%.
And in the fifth step, the other auxiliary agents comprise a defoaming agent and an air entraining agent.
The invention relates to a method for preparing a super high performance concrete admixture by using waste concrete slurry, which not only reuses the waste concrete slurry, but also optimizes the dosage proportion of mother liquor of a water reducing agent, sodium alginate, lignosulfonate, potassium acrylate, polyethylene glycol, sodium silicate, first deionized water and other auxiliary agents, obviously reduces the bleeding rate of the concrete, further improves the workability, the strength and the durability of the concrete, ensures that the concrete has good performances of freezing resistance, cold resistance, water resistance and the like, improves the dispersion degree of the admixture to concrete particles, reduces the water consumption, further strengthens the performance of the concrete after the admixture is added, improves the performances of the concrete such as corrosion resistance, the workability and the like, and the prepared mother liquor of the water reducing agent can promote the dispersion of the concrete particles, enhances the strength and the workability of the concrete, the corrosion resistance, the acid resistance, the tax reducing performance and the like of the concrete are further improved, the waste slurry particles are uniformly dispersed by adding the surfactant into the waste concrete slurry and carrying out ultrasonic dispersion, the further hydration reaction of the waste slurry is prevented, the dissolution of substances can be accelerated and increased as much as possible by adding the ferric chloride solution into the nitric acid, the silicon dioxide in the waste concrete slurry and the residual substances such as C-S-H condensation can be dissolved by injecting hydrofluoric acid, the sodium fluosilicate and the sodium silicate can be generated in the solution by further adding the calcium hydroxide, and the prepared ultra-high performance concrete admixture solves the problem of the reduction of the concrete performance caused by the ultra-high performance concrete admixture after being mixed into the concrete, thereby not only ensuring the improvement of the early strength of the ultra-high performance concrete, but also realizing the reclamation, fine and high-end utilization of the waste concrete slurry, the bleeding rate of the concrete is obviously reduced, the workability, the strength and the durability of the concrete are further improved, the concrete has good freezing resistance, cold resistance, water resistance and other performances, the dispersion degree of the admixture to concrete particles is improved, the water consumption is reduced, and the performance of the concrete after the admixture is added is further enhanced, so that the corrosion resistance, the workability and other performances of the concrete are improved, the dispersion of the concrete particles can be promoted, the strength and the workability of the concrete are enhanced, and the corrosion resistance, the acid resistance, the tax reducing performance and other performances of the concrete are further improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of the steps of example 1 of the present invention.
Fig. 2 is a flowchart of the steps of embodiment 2 of the present invention.
Fig. 3 is a flowchart of the steps of embodiment 3 of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention. Further, in the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Example 1, referring to fig. 1, fig. 1 is a flowchart illustrating steps of example 1 of the present invention, and the present invention provides a method for preparing an ultra-high performance concrete admixture from waste concrete slurry, wherein the method for preparing the ultra-high performance concrete admixture from the waste concrete slurry comprises, by weight, 35 parts of a water reducing agent mother liquor, 26 parts of first deionized water, 9 parts of sodium silicate, 5 parts of sodium alginate, 6 parts of lignosulfonate, 4 parts of potassium acrylate, and 20 parts of second deionized water.
A method for preparing an ultra-high performance concrete admixture by using concrete waste slurry comprises the following steps:
s1: firstly, dissolving a methacrylic acid copolymer in water, dropwise adding sodium hydroxide to adjust the pH value of the solution to 11-12 to obtain a solution A for later use, adding a surfactant into the concrete waste slurry, stirring and ultrasonically dispersing, dropwise adding a mixed solution of nitric acid and ferric chloride to perform a neutralization reaction until the solution is neutral, and then filtering to obtain an impurity I and a solution B;
s2: placing the impurity I into a closed container with a feeding pipe, adding a second batch of nitric acid solution, injecting hydrofluoric acid solution into the container, continuously and slowly stirring, slowly injecting sodium hydroxide solution into the closed container after reacting for a period of time, continuously stirring to adjust the pH value of the solution to be 12-14, and filtering out particles to obtain a solution C;
s3: weighing 35 parts of water reducer mother liquor according to parts by weight, adding 26 parts of first deionized water for dilution, uniformly stirring to prepare a first dispersion solution, mixing 9 parts of sodium silicate, 5 parts of sodium alginate, 6 parts of lignosulfonate and 4 parts of potassium acrylate, adding 20 parts of second deionized water and polyethylene glycol, and uniformly stirring to prepare a second dispersion solution;
s4: and adding the solution A, the solution B, the solution C, the first dispersion liquid and the second dispersion liquid into a mixing device, uniformly mixing, adding other auxiliaries, and uniformly stirring to obtain the ultra-high performance concrete admixture.
In the first step, the time for stirring and ultrasonic dispersion was 1.5h.
The waste concrete pulp is recycled, the using amount ratio of the water reducing agent mother liquor, sodium alginate, lignosulfonate, potassium acrylate, polyethylene glycol, sodium silicate, first deionized water and other auxiliaries is optimized, the bleeding rate of the concrete is obviously reduced, the workability, the strength and the durability of the concrete are further improved, the concrete has good freezing resistance, cold resistance, water resistance and other performances, the dispersity of the admixture on concrete particles is improved, the water consumption is reduced, the performance of the concrete after the admixture is added is further enhanced, the corrosion resistance, the workability and other performances of the concrete are improved, the prepared water reducing agent mother liquor can promote the dispersion of the concrete particles, the strength and the workability of the concrete are enhanced, the corrosion resistance, the acid resistance, the tax reduction and other performances of the concrete are further improved, the concrete admixture with ultrahigh performance solves the problem of concrete performance reduction caused by the admixture of the concrete admixture with high performance, ensures the improvement of the early strength of the ultrahigh performance concrete, realizes the resource and fine high-end utilization of the waste cement paste of the concrete, obviously reduces the bleeding rate of the concrete, and further improves the workability of the concrete, the concrete has the advantages of high strength and durability, good freezing resistance, cold resistance, water resistance and other performances, improved dispersity of the admixture to concrete particles, reduced water consumption, and further enhanced performance of the concrete after the admixture is added, so that the corrosion resistance, the workability and other performances of the concrete are improved, the dispersion of the concrete particles can be promoted, the strength and the workability of the concrete are enhanced, and the corrosion resistance, the acid resistance, the tax reducing performance and other performances of the concrete are further improved.
Example 2, referring to fig. 2, fig. 2 is a flowchart illustrating steps of example 2 of the present invention, and the present invention provides a method for preparing an ultra-high performance concrete admixture using waste concrete slurry, wherein the method for preparing the ultra-high performance concrete admixture using the waste concrete slurry comprises, by weight, 37.5 parts of a water reducer mother liquor, 24 parts of first deionized water, 8 parts of sodium silicate, 4 parts of sodium alginate, 5 parts of lignosulfonate, 3.5 parts of potassium acrylate, and 17.5 parts of second deionized water.
A method for preparing an ultra-high performance concrete admixture by using concrete waste slurry comprises the following steps:
s1: firstly, dissolving a methacrylic acid copolymer in water, dropwise adding sodium hydroxide to adjust the pH value of the solution to 11-12 to obtain a solution A for later use, adding a surfactant into the concrete waste slurry, stirring and ultrasonically dispersing, dropwise adding a mixed solution of nitric acid and ferric chloride to perform a neutralization reaction until the solution is neutral, and then filtering to obtain an impurity I and a solution B;
s2: placing the impurity I into a closed container with a feeding pipe, adding a second batch of nitric acid solution, injecting hydrofluoric acid solution into the container, continuously and slowly stirring, slowly injecting sodium hydroxide solution into the closed container after reacting for a period of time, continuously stirring to adjust the pH value of the solution to be 12-14, and filtering out particles to obtain a solution C;
s3: weighing 37.5 parts of water reducer mother liquor according to parts by weight, adding 24 parts of first deionized water for dilution, uniformly stirring to prepare a first dispersion solution, mixing 8 parts of sodium silicate, 4 parts of sodium alginate, 5 parts of lignosulfonate and 3.5 parts of potassium acrylate, adding 17.5 parts of second deionized water and polyethylene glycol, and uniformly stirring to prepare a second dispersion solution;
s4: and adding the solution A, the solution B, the solution C, the first dispersion liquid and the second dispersion liquid into a mixing device, uniformly mixing, adding other auxiliaries, and uniformly stirring to obtain the ultra-high performance concrete admixture.
In the second step, the mass concentration of the sodium hydroxide solution is 30%.
The waste concrete pulp is recycled, the using amount ratio of the water reducing agent mother liquor, sodium alginate, lignosulfonate, potassium acrylate, polyethylene glycol, sodium silicate, first deionized water and other auxiliaries is optimized, the bleeding rate of the concrete is obviously reduced, the workability, the strength and the durability of the concrete are further improved, the concrete has good freezing resistance, cold resistance, water resistance and other performances, the dispersity of the admixture on concrete particles is improved, the water consumption is reduced, the performance of the concrete after the admixture is added is further enhanced, the corrosion resistance, the workability and other performances of the concrete are improved, the prepared water reducing agent mother liquor can promote the dispersion of the concrete particles, the strength and the workability of the concrete are enhanced, the corrosion resistance, the acid resistance, the tax reduction and other performances of the concrete are further improved, the concrete admixture with ultra-high performance solves the problem of concrete performance reduction caused by the admixture of the concrete admixture with high performance, ensures the improvement of the early strength of the ultra-high performance concrete, realizes the resource and fine high-end utilization of the waste cement paste of the concrete, obviously reduces the bleeding rate of the concrete, and further improves the workability of the concrete, the concrete has the advantages of high strength and durability, good freezing resistance, cold resistance, water resistance and other performances, improved dispersity of the admixture to concrete particles, reduced water consumption, and further enhanced performance of the concrete after the admixture is added, so that the corrosion resistance, the workability and other performances of the concrete are improved, the dispersion of the concrete particles can be promoted, the strength and the workability of the concrete are enhanced, and the corrosion resistance, the acid resistance, the tax reducing performance and other performances of the concrete are further improved.
Example 3, referring to fig. 3, fig. 3 is a flowchart illustrating steps of example 3 of the present invention, and the present invention provides a method for preparing an ultra-high performance concrete admixture from waste concrete pulp, wherein the method for preparing the ultra-high performance concrete admixture from the waste concrete pulp comprises, by weight, 40 parts of a water reducer mother liquor, 22 parts of first deionized water, 7 parts of sodium silicate, 3 parts of sodium alginate, 4 parts of lignosulfonate, 3 parts of potassium acrylate, and 15 parts of second deionized water.
A method for preparing an ultra-high performance concrete admixture by using concrete waste slurry comprises the following steps:
s1: firstly, dissolving a methacrylic acid copolymer in water, dropwise adding sodium hydroxide to adjust the pH value of the solution to 11-12 to obtain a solution A for later use, adding a surfactant into the concrete waste slurry, stirring and ultrasonically dispersing, dropwise adding a mixed solution of nitric acid and ferric chloride to perform a neutralization reaction until the solution is neutral, and then filtering to obtain an impurity I and a solution B;
s2: placing the impurity I into a closed container with a feeding pipe, adding a second batch of nitric acid solution, injecting hydrofluoric acid solution into the container, continuously and slowly stirring, slowly injecting sodium hydroxide solution into the closed container after reacting for a period of time, continuously stirring to adjust the pH value of the solution to be 12-14, and filtering out particles to obtain a solution C;
s3: weighing 40 parts of water reducing agent mother liquor according to parts by weight, adding 22 parts of first deionized water for dilution, uniformly stirring to prepare a first dispersion solution, mixing 7 parts of sodium silicate, 3 parts of sodium alginate, 4 parts of lignosulfonate and 3 parts of potassium acrylate, adding 15 parts of second deionized water and polyethylene glycol, and uniformly stirring to prepare a second dispersion solution;
s4: and adding the solution A, the solution B, the solution C, the first dispersion liquid and the second dispersion liquid into a mixing device, uniformly mixing, adding other auxiliaries, and uniformly stirring to obtain the ultra-high performance concrete admixture.
In the second step, hydrofluoric acid solution was injected into the vessel and the reaction time was 7 hours after continuous slow stirring.
The waste concrete slurry is recycled, the dosage proportion of the water reducer mother liquor, sodium alginate, lignosulfonate, potassium acrylate, polyethylene glycol, sodium silicate, first deionized water and other auxiliaries is optimized, the bleeding rate of the concrete is obviously reduced, the workability, the strength and the durability of the concrete are further improved, the concrete has good freezing resistance, cold resistance, water resistance and other performances, the dispersity of the admixture on concrete particles is improved, the water consumption is reduced, the performance of the concrete after the admixture is added is further enhanced, the corrosion resistance, the workability and other performances of the concrete are further improved, the prepared water reducer mother liquor can promote the dispersion of the concrete particles, the strength and the workability of the concrete are enhanced, the corrosion resistance, the acid resistance, the tax resistance and other performances of the concrete are further improved, the concrete admixture with ultra-high performance solves the problem of concrete performance reduction caused by the admixture of the concrete admixture with high performance, ensures the improvement of the early strength of the ultra-high performance concrete, realizes the resource and fine high-end utilization of the waste cement paste of the concrete, obviously reduces the bleeding rate of the concrete, and further improves the workability of the concrete, the concrete has the advantages of high strength and durability, good freezing resistance, cold resistance, water resistance and other performances, improved dispersity of the admixture to concrete particles, reduced water consumption, and further enhanced performance of the concrete after the admixture is added, so that the corrosion resistance, the workability and other performances of the concrete are improved, the dispersion of the concrete particles can be promoted, the strength and the workability of the concrete are enhanced, and the corrosion resistance, the acid resistance, the tax reducing performance and other performances of the concrete are further improved.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (7)
1. A method for preparing an ultra-high performance concrete admixture by using concrete waste slurry is characterized by comprising the following steps:
the method comprises the following steps: firstly, dissolving a methacrylic acid copolymer in water, dropwise adding sodium hydroxide to adjust the pH value of the solution to 11-12 to obtain a solution A for later use, then adding a surfactant into the concrete waste slurry, stirring and ultrasonically dispersing, dropwise adding a mixed solution of nitric acid and ferric chloride to perform a neutralization reaction until the solution is neutral, and then filtering to obtain an impurity I and a solution B;
step two: placing the impurity I into a closed container with a feeding pipe, adding a second batch of nitric acid solution, injecting hydrofluoric acid solution into the container, continuously and slowly stirring, slowly injecting sodium hydroxide solution into the closed container after reacting for a period of time, continuously stirring to adjust the pH value of the solution to be 12-14, and filtering out particles to obtain a solution C;
step three: weighing 35-40 parts of water reducer mother liquor by weight, adding 22-26 parts of first deionized water for dilution, uniformly stirring to prepare a first dispersion, mixing 7-9 parts of sodium silicate, 3-5 parts of sodium alginate, 4-6 parts of lignosulfonate and 3-4 parts of potassium acrylate, adding 15-20 parts of second deionized water and polyethylene glycol, and uniformly stirring to prepare a second dispersion;
step four: and adding the solution A, the solution B, the solution C, the first dispersion liquid and the second dispersion liquid into a mixing device, uniformly mixing, adding other auxiliaries, and uniformly stirring to obtain the ultra-high performance concrete admixture.
2. The method for preparing an ultra high performance concrete admixture using concrete waste slurry according to claim 1,
the surfactant is any one of sodium dodecyl sulfate, polyethylene glycol and alkyl glycoside.
3. The method for preparing an ultra high performance concrete admixture using concrete waste slurry according to claim 2,
in the first step, stirring and ultrasonic dispersion are carried out for 1-2h.
4. The method for preparing an ultra high performance concrete admixture using concrete waste slurry according to claim 3,
in the second step, hydrofluoric acid solution is injected into the container, and the reaction time is 6-8h after continuous slow stirring.
5. The method for preparing an ultra high performance concrete admixture using concrete waste slurry according to claim 4,
in the third step, the sum of the amount of the sodium silicate and the amount of the sodium alginate is not more than 20-40% of the mother liquor of the water reducing agent.
6. The method for preparing an ultra high performance concrete admixture using concrete waste slurry according to claim 5,
in the second step, the mass concentration of the sodium hydroxide solution is 20-45%.
7. The method for preparing an ultra high performance concrete admixture using concrete waste slurry according to claim 6,
in step five, the other auxiliary agents comprise a defoaming agent and an air entraining agent.
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|---|---|---|---|---|
| CN107522421A (en) * | 2017-08-16 | 2017-12-29 | 湖南兆丰混凝土有限公司 | A kind of concrete mineral additive, its preparation method and a kind of concrete |
| KR102172007B1 (en) * | 2020-02-12 | 2020-11-02 | 대로건설(주) | Polymer Cement Concrete Composition with Improved Performance and Road Pavement Method Using the Same |
| CN113402196A (en) * | 2021-06-23 | 2021-09-17 | 济南方圣混凝土构件有限公司 | Method for preparing ultra-high performance concrete admixture by using concrete waste slurry |
| CN114133163A (en) * | 2021-11-23 | 2022-03-04 | 东莞市金胜混凝土有限公司 | Concrete additive and preparation method thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107522421A (en) * | 2017-08-16 | 2017-12-29 | 湖南兆丰混凝土有限公司 | A kind of concrete mineral additive, its preparation method and a kind of concrete |
| KR102172007B1 (en) * | 2020-02-12 | 2020-11-02 | 대로건설(주) | Polymer Cement Concrete Composition with Improved Performance and Road Pavement Method Using the Same |
| CN113402196A (en) * | 2021-06-23 | 2021-09-17 | 济南方圣混凝土构件有限公司 | Method for preparing ultra-high performance concrete admixture by using concrete waste slurry |
| CN114133163A (en) * | 2021-11-23 | 2022-03-04 | 东莞市金胜混凝土有限公司 | Concrete additive and preparation method thereof |
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