CN114702285A - Multi-source waste residue-based concrete 3D printing material and preparation method thereof - Google Patents

Multi-source waste residue-based concrete 3D printing material and preparation method thereof Download PDF

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CN114702285A
CN114702285A CN202111648227.3A CN202111648227A CN114702285A CN 114702285 A CN114702285 A CN 114702285A CN 202111648227 A CN202111648227 A CN 202111648227A CN 114702285 A CN114702285 A CN 114702285A
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parts
printing material
agent
waste residue
natural river
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CN114702285B (en
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钱元弟
金仁才
唐刚
方圆
何兆芳
王新成
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China MCC17 Group Co Ltd
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China MCC17 Group Co Ltd
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Priority to PCT/CN2022/127571 priority patent/WO2023124471A1/en
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    • 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
    • C04B28/06—Aluminous cements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
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    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/14—Waste materials; Refuse from metallurgical processes
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    • C04B24/003—Phosphorus-containing compounds
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    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/12—Nitrogen containing compounds organic derivatives of hydrazine
    • C04B24/122—Hydroxy amines
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    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
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    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
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    • C04B24/24—Macromolecular compounds
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    • 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
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    • Y02W30/00—Technologies for solid waste management
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Abstract

The invention discloses a multi-source waste residue based concrete 3D printing material and a preparation method thereof, belonging to the field of concrete building materials, wherein the raw materials in parts by weight are as follows: 10-80 parts of Portland cement, 20-70 parts of aluminate cement, 500 parts of solid waste cementing material 300-containing materials, 500 parts of functional fine aggregate 200-containing materials, 0.2-0.5 part of water reducing agent, 0.1-0.5 part of water-retaining agent, 0.1-0.4 part of interface excitant, 0.4-0.8 part of complexing agent, 0.2-3.0 parts of surface film-forming agent, 0.2-0.6 part of fiber, 2-8 parts of latex powder and 200-880 parts of water. The metal ion complex is adopted to react with calcium hydroxide in cement and an interface activator to form a gelling component, simultaneously, a complexing agent is synchronously released for sustainable use, and the internal pore structure and the flow channel of the concrete are continuously repaired in a circulating way through the complexing agent → the metal ion complexing agent (metal ion complexing) → the complexing agent (metal ion releasing gelling material forming, complexing agent being repeatedly used), so that the printing material is endowed with continuous excellent late-stage strength and weather resistance, and the preparation method is simple in process and easy to operate and implement.

Description

Multi-source waste residue-based concrete 3D printing material and preparation method thereof
Technical Field
The invention belongs to the technical field of concrete building materials, and particularly relates to a multi-source waste residue based concrete 3D printing material and a preparation method thereof.
Background
With the rise of computer technology, 3D printing technology is developing vigorously in the fields of medical treatment, aerospace, architecture, electronics, clothing, intelligent manufacturing, etc. In the building industry, the 3D printing technology has the advantages of no model, refinement, editing and the like, has wide application prospect and promotes the building industry to develop to a higher dimension. In the production process of metallurgy and coal-electricity industry, a large amount of large solid waste slag such as steel slag, fly ash and the like is generated. The solid waste residues are relatively difficult to dispose at present and are mainly treated in an open-air stacking mode. On one hand, the disposal mode consumes a large amount of farmland resources, and on the other hand, the accumulation of waste residues easily causes air, water and soil pollution and negative effects on the environment. The steel slag, the slag and the fly ash are rich in potential gelled components such as calcium oxide, silicon oxide, aluminum oxide and the like, and have the potential of becoming building materials.
In general, 3D printed concrete materials usually require the introduction of a large amount of fine aggregate components, but the rigid fine aggregate particles have a large particle size and are not sufficiently compatible with other components in the concrete material. Meanwhile, the fine aggregate has high rigidity, effective buffer connection is lacked among fine aggregate particles, so that the prepared 3D printed concrete material has insufficient toughness, and the prepared 3D printed concrete material is often subjected to brittle fracture due to the defects.
In order to meet the requirement of 3D printing, concrete materials have high early strength, short setting time and proper aggregate particle size. Meanwhile, the 3D printed concrete usually does not allow the addition of reinforcing steel bars, so that the concrete material is required to have stronger toughness and deformability. In addition, in the printing process, the cohesiveness of the conventional 3D printed concrete is poor, so that the mechanical property and the weather resistance of the product are affected.
Disclosure of Invention
1. The technical problems to be solved by the invention are as follows:
aiming at the problems of large cement usage amount, low strength, poor toughness and insufficient cohesiveness of the existing concrete 3D printing material, the invention aims to provide a multisource waste residue-based concrete 3D printing material and a preparation method thereof. Various metallurgical and coal-electricity waste residues are introduced into the multi-source waste residue-based concrete 3D printing material, so that the use amount of cement is effectively reduced, the rigid fine aggregate is functionalized, and the excellent early strength and cohesiveness of the multi-source waste residue-based concrete 3D printing material are effectively improved through synergistic reaction of a waste residue cementing material, a surface activator and a complexing agent; the formed metal ion complex can synchronously release a complexing agent while forming a gelling component with calcium hydroxide in cement and an interface activator, and the internal pore structure and a flow channel of the concrete are repaired by the circulation of the complexing agent → the metal ion complexing agent (metal ion complexing) → the complexing agent (metal ion releasing, gelling material forming and complexing agent reusing), so that the 3D printing material for the multi-source waste residue-based concrete is endowed with continuously excellent late-stage strength and weather resistance; the method comprises the steps of introducing tough organic components such as polydopamine, polyurethane and melamine-formaldehyde resin into the surface of fine aggregate to prepare functional fine aggregate, introducing the functional fine aggregate and fibers into the concrete 3D printing material, and endowing the multisource waste residue based concrete 3D printing material with excellent toughness and deformability through the synergistic effect of the functional fine aggregate and the fibers, wherein the multisource waste residue based concrete 3D printing material meets the high-performance concrete standard and can meet the requirement of 3D printing on rapid solidification; by introducing a surface film-forming agent with a specific hydrophilic-lipophilic ratio, wherein the surface film-forming agent is an emulsion copolymerization system, the surface film-forming agent can be uniformly dispersed in concrete in the mixing process, and can migrate to the surface of a printed concrete member to form a film automatically through the action of the low surface energy of the lipophilic section after printing is finished, so that the 3D printing material of the multi-source waste residue-based concrete is endowed with the smooth characteristic, the toughness of the surface of the material is increased, and the surface of the member is prevented from cracking and falling off; the preparation method of the multi-source waste residue-based concrete 3D printing material is simple and easy to operate and implement.
2. Technical scheme
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention relates to a multi-source waste residue-based concrete 3D printing material and a preparation method thereof, wherein the multi-source waste residue-based concrete 3D printing material comprises the following raw materials in parts by weight:
Figure BDA0003445932070000031
preferably, the portland cement is one or more of p.o32.5 cement and p.o42.5 cement mixed in any proportion.
Preferably, the solid waste gel material is one or more of fly ash, steel slag and slag which are mixed according to any proportion, the specific surface area is 400-1000m2/kg, the residue of a 45 mu m square hole sieve is less than 1.5 percent,
preferably, the functional fine aggregate is one or more of polydopamine modified natural river sand, polyurethane modified natural river sand, melamine-formaldehyde resin modified natural river sand, polydopamine modified regeneration machine-made sand, polyurethane modified regeneration machine-made sand and melamine-formaldehyde resin modified regeneration machine-made sand which are mixed according to any proportion;
the preparation method of the polydopamine modified natural river sand or the polydopamine modified reclaimed machine-made sand comprises the following steps:
drying natural river sand or reclaimed machine-made sand, preparing 0.01-10g/L dopamine solution, adjusting the pH value to 7-11, dispersing natural river sand or reclaimed machine-made sand powder in the dopamine solution, stirring for 0.2-20h, filtering and drying a sample to obtain polydopamine modified natural river sand or polydopamine modified reclaimed machine-made sand;
the preparation method of the polyurethane modified natural river sand or polyurethane modified reclaimed machine-made sand comprises the following steps:
dissolving 2-10 parts of pentaerythritol in 3-150 parts of dimethyl sulfoxide, adding 5-25 parts of 2, 4-toluene-diisocyanate and 75-375 parts of 1,4 dioxane, uniformly stirring, adding 60-300 parts of fine aggregate of natural river sand or regenerative machine-made sand, 150-7501,4 dioxane, 0.6-3 parts of span-80 and 0.25-1.25 parts of triethylene diamine, heating for reaction for a certain time (80 ℃ for 2-15 hours), and filtering to obtain polyurethane modified natural river sand or polyurethane modified regenerative machine-made sand;
the preparation method of the melamine-formaldehyde resin modified natural river sand or the melamine-formaldehyde resin modified reclaimed machine-made sand comprises the following steps:
10-50 parts of melamine, 3-50 parts of formaldehyde and 50-250 parts of water, adjusting the pH value to be alkaline, and stirring for 3-250min at 35-90 ℃ to obtain a melamine-formaldehyde resin prepolymer;
dispersing 30-300 parts of natural river sand or reclaimed machine-made sand in 75-750 parts of alcohol solution, adding melamine-formaldehyde prepolymer under the condition that the pH value is acidic (1-6.9), heating and stirring at 35-95 ℃ for 15-300min, reducing the temperature to room temperature, and drying to obtain the melamine-formaldehyde resin modified natural river sand or melamine-formaldehyde resin modified reclaimed machine-made sand.
Preferably, the water reducing agent is one or more of a naphthalene water reducing agent, a sodium lignosulfonate water reducing agent and a polycarboxylic acid water reducing agent which are mixed according to any proportion.
Preferably, the interface activator is sodium silicate (Na)2SiO3) Potassium silicate (K)2SiO3) One or more of sodium hydroxide (NaOH) and potassium hydroxide are mixed according to any proportion.
Preferably, the complexing agent is one or more of sodium ethylene diamine tetracetate, triethanolamine, sodium ethylene diamine tetracomethyl phosphate and polyhydroxyacrylic acid which are mixed according to any proportion.
Preferably, the water retaining agent is one or more of hydroxymethyl propyl cellulose ether, hydroxyethyl propyl cellulose ether, hydroxymethyl propyl starch ether and hydroxyethyl propyl starch ether mixed in any proportion.
Preferably, the surface film-forming agent is an emulsion copolymerization system with certain hydrophilic-lipophilic characteristics, the solid content of the emulsion copolymer is 5-50%, the mass ratio of hydrophilic chain segments in the emulsion copolymer is 0.5-13.5%, the mass ratio of lipophilic chain segments in the emulsion copolymer is 86.5-99.5%, and the hydrophilic chain segments are one or more of acrylic acid, acrylamide, methacrylic acid and methacrylamide; the oleophilic chain segment is one or a combination of more of methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, amyl acrylate, hexyl acrylate, octyl acrylate, trifluoroethyl acrylate, pentafluoropropyl acrylate, octafluoropentyl acrylate, heptadecafluorononyl acrylate, heptadecafluorodecyl acrylate, trifluoroethyl methacrylate, pentafluoropropyl methacrylate, octafluoropentyl methacrylate, heptadecafluorononyl methacrylate and heptadecafluorodecyl methacrylate.
Preferably, the fiber is one or more of polyethylene fiber, polyvinyl alcohol fiber, polypropylene fiber, carbon fiber and Kevlar fiber which are mixed according to any proportion.
Preferably, the fibers are 2-15mm in length.
Preferably, the latex powder is one or more of styrene-butadiene copolymer, ethylene versatate copolymer and ethylene-vinyl acetate copolymer which are mixed according to any proportion.
A preparation method of a multi-source waste residue-based concrete 3D printing material comprises the following steps:
s1: stirring portland cement, aluminate cement, a solid waste cementing material, functional fine aggregate, a water reducing agent, a water-retaining agent, latex powder and fiber in a stirrer to obtain a solid powdery mixture;
s2, dissolving the interface activator in water, and stirring to obtain an interface activator solution;
s3: and adding the interface activator solution into the solid powdery mixture, and stirring to obtain the multi-source waste residue-based concrete 3D printing material.
Preferably: in step S1, the stirring speed is 200-300 rpm/min, and the stirring time is 5-10 min;
preferably: in step S2, the stirring speed is 100-300 rpm/min, and the stirring time is 5-8 min;
preferably: in step S3, the stirring speed is 300-500 rpm/min, and the stirring time is 5-15 min.
3. Advantageous effects
Compared with the prior art, the invention has the following beneficial effects:
(1) a large amount of solid waste residues (steel slag, fly ash and slag) in the industries of metallurgy, coal electricity and the like are used as cementing materials to replace cement and used for preparing a multi-source waste residue-based concrete 3D printing material, so that high-value utilization of the waste residues is realized.
(2) According to the multisource waste residue-based concrete 3D printing material provided by the invention, metal ions precipitated from cement and waste residue cementing materials are subjected to complexing enrichment through a complexing agent to form a metal ion complex, and the metal ion complex, a hydration product calcium hydroxide and an interface activator are subjected to a bonding reaction to form a cementing component taking hydrated calcium silicate, hydrated calcium aluminate and hydrated calcium aluminosilicate as main bodies, so that the prepared concrete micro pores and pores formed by printing are repaired, and the multisource waste residue-based concrete 3D printing material is endowed with excellent early strength and cohesiveness.
(3) According to the multisource waste residue based concrete 3D printing material provided by the invention, the metal ion complex can synchronously release the complexing agent while reacting with calcium hydroxide in cement and an interface activator to form a gelled component, and can be continuously used, and the internal pore structure and the flow channel of the concrete can be continuously repaired in a circulating manner through the complexing agent → the metal ion complexing agent (metal ion complexing) → the complexing agent (metal ion releasing, gelling material forming and complexing agent reusing), so that the multisource waste residue based concrete 3D printing material is endowed with excellent long-term strength and weather resistance.
(4) According to the multisource waste residue based concrete 3D printing material provided by the invention, the surface of rigid fine aggregate particles is functionalized, polydopamine, polyurethane and melamine-formaldehyde resin are introduced to prepare the functionalized fine aggregate, and the toughness and the deformability of the multisource waste residue based concrete 3D printing material are effectively improved through the synergistic effect between the functionalized fine aggregate and fibers.
(5) The surface film-forming agent with a specific hydrophilic-lipophilic ratio is introduced, the surface film-forming agent is an emulsion copolymerization system, the surface film-forming agent can be uniformly dispersed in concrete in the mixing process, and the surface film-forming agent can migrate to the surface of a printed concrete member to form a film automatically through the action of the low surface energy of the lipophilic section after printing is finished, so that the multisource waste residue based concrete 3D printing material is endowed with the smooth characteristic, the toughness of the surface of the material is increased, and the surface of the member is prevented from cracking and falling off.
(6) The preparation method of the multi-source waste residue-based concrete 3D printing material is simple and easy to operate and implement.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
Example 1
50 parts of portland cement (P.O 42.5.5 cement), 50 parts of aluminate cement, 300 parts of solid waste cementing material (100 parts of steel slag, 100 parts of fly ash and 100 parts of slag), 250 parts of functionalized fine aggregate (polydopamine modified natural river sand), 0.3 part of water reducing agent (naphthalene water reducing agent), 0.3 part of water retaining agent (hydroxyethyl propyl cellulose ether 0.3 part), 0.3 part of interface activator (sodium silicate 0.2 part and sodium hydroxide 0.1 part), 0.5 part of complexing agent (triethanolamine 0.3 part and sodium ethylene diamine tetracetate 0.2 part), 10 parts of surface film forming agent (15 percent, acrylic acid-trifluoroethyl acrylate copolymer, acrylic acid content 8.5 percent and trifluoroethyl acrylate content 91.5 percent), 0.5 part of fiber (polypropylene fiber 0.5 part and fiber length 6mm), 4 parts of latex powder (styrene-butadiene copolymer 2 parts, solid content, styrene-butadiene copolymer 2 parts, and styrene-butadiene copolymer 100 parts, Ethylene-tertbutyrate copolymer 2 parts), water 390 parts.
The preparation method of the polydopamine modified natural river sand comprises the following steps:
drying natural river sand, preparing 0.01-10g/L dopamine solution, adjusting the pH value to 7-11, dispersing natural river sand or regenerated machine-made sand powder into the dopamine solution, stirring for 5 hours, filtering and drying a sample to obtain the polydopamine modified natural river sand.
The preparation steps of the multi-source waste residue-based concrete 3D printing material are as follows:
s1: 50 parts of Portland cement (P.O 42.5.5 parts of cement), 50 parts of aluminate cement, 300 parts of solid waste cementing materials (100 parts of steel slag, 100 parts of fly ash and 100 parts of slag), 250 parts of fine aggregate (polydopamine modified natural river sand) and 0.3 part of water reducing agent (naphthalene water reducing agent), 0.3 part of water-retaining agent (hydroxyethyl propyl cellulose ether), 0.5 part of complexing agent (0.3 part of triethanolamine and 0.2 part of ethylene diamine tetraacetic acid), 4 parts of latex powder (2 parts of styrene-butadiene copolymer and 2 parts of ethylene versatate copolymer), 10 parts of surface film-forming agent (solid content 15%, acrylic acid-trifluoroethyl acrylate copolymer, acrylic acid content 8.5%, trifluoroethyl acrylate content 91.5%) and 0.5 part of fiber (polypropylene fiber, fiber length 6mm) are stirred in a stirrer at 250 rpm/min for 8 min to obtain a solid powdery mixture;
s2, dissolving the interface activator (0.2 part of sodium silicate and 0.1 part of sodium hydroxide) in 390 parts of water, and stirring at 100 rpm/min for 5 minutes to obtain an interface activator solution;
s3: and adding the interface activator solution into the solid powdery mixture, and stirring at 400 rpm/min for 10 minutes to obtain the multi-source waste residue-based concrete 3D printing material.
Example 2
A multisource waste residue based concrete 3D printing material comprises, by weight, 60 parts of portland cement (P.O 32.5.5 cement 30 parts and P.O 42.5.5 cement 30 parts), 40 parts of aluminate cement, 400 parts of solid waste cementing materials (steel slag 150 parts, coal ash 150 parts and slag 100 parts), 300 parts of functional fine aggregates (polydopamine modified reclaimed machine-made sand 100 parts and polyurethane modified natural river sand 200 parts), 0.4 part of water reducing agent (naphthalene water reducing agent 0.2 part and polycarboxylic acid water reducing agent 0.2 part), 0.4 part of water retaining agent (hydroxymethyl propyl cellulose ether 0.2 part and hydroxymethyl propyl starch ether 0.2 part), 0.3 part of interface activator (potassium silicate 0.15 part and sodium hydroxide 0.15 part), 0.6 part of complexing agent (sodium ethylene diamine tetracetate), 14 parts of surface film forming agent (solid content 25%, methacrylic acid-octyl acrylate copolymer, methacrylic acid content 5.0%, octyl acrylate content 95.0%), and, 0.4 part of fiber (0.2 part of polyvinyl alcohol fiber, the fiber length is 10 mm; 0.2 part of polypropylene fiber, the fiber length is 6mm), 5 parts of latex powder (3 parts of styrene-butadiene copolymer, 2 parts of ethylene-vinyl acetate copolymer) and 480 parts of water.
The preparation method of the polydopamine modified regeneration machine-made sand comprises the following steps:
drying the regenerated machine-made sand, preparing 0.01-10g/L dopamine solution, adjusting the pH value to 7-11, dispersing natural river sand or regenerated machine-made sand powder in the dopamine solution, stirring for 4 hours, filtering and drying a sample to obtain polydopamine modified regenerated machine-made sand;
the preparation method of the polyurethane modified natural river sand comprises the following steps:
2-10 parts of pentaerythritol are dissolved in 3-150 parts of dimethyl sulfoxide, 5-25 parts of 2, 4-toluene-diisocyanate and 75-375 parts of 1,4 dioxane are added, after uniform stirring, 60-300 parts of fine aggregate of natural river sand, 150-7501,4 dioxane, 0.6-3 parts of span-80 and 0.25-1.25 parts of triethylene diamine are added, and after heating reaction for a certain time (80 ℃ for 2-15 hours), filtration is carried out to obtain the polyurethane modified natural river sand.
The preparation steps of the multi-source waste residue-based concrete 3D printing material are as follows:
s1: 60 parts of portland cement (P.O 32.5.5 parts of cement 30, P.O 42.5.5 parts of cement 30), 40 parts of aluminate cement, 400 parts of solid-waste cementing material (steel slag 150, fly ash 150 and slag 100), 300 parts of functional fine aggregate (polydopamine modified regeneration machine sand 100 and polyurethane modified natural river sand 200), 0.4 part of water reducing agent (naphthalene water reducing agent 0.2 and polycarboxylic acid water reducing agent 0.2), 0.4 part of water retention agent (hydroxymethyl propyl cellulose ether 0.2 and hydroxymethyl propyl starch ether 0.2), 0.6 part of complexing agent (sodium ethylene diamine tetracetate), 5 parts of latex powder (styrene-butadiene copolymer 3 and ethylene-vinyl acetate copolymer 2), 14 parts of surface film forming agent (solid content 25%, methacrylic acid-octyl acrylate copolymer, methacrylic acid content 5.0% and octyl acrylate content 95.0%) 0.4 part of a fiber (0.2 part of a polyvinyl alcohol fiber, fiber length 10 mm; 0.2 part of a polypropylene fiber, fiber length 6mm) was stirred in a stirrer at 200 rpm/min for 6 minutes to obtain a solid powdery mixture;
s2, dissolving the interface activator (potassium silicate 0.15 parts, sodium hydroxide 0.15 parts) in 480 parts of water, and stirring at 150 rpm/min for 7 minutes to obtain an interface activator solution;
s3: and adding the interface activator solution into the solid powdery mixture, and stirring at 400 rpm/min for 10 minutes to obtain the multi-source waste residue-based concrete 3D printing material.
Example 3
30 parts of Portland cement (P.O 32.5.5 cement), 70 parts of aluminate cement, 300 parts of solid waste cementing material (150 parts of steel slag, 120 parts of fly ash and 30 parts of slag), 300 parts of functionalized fine aggregate (melamine-formaldehyde resin modified regeneration mechanism river sand), 0.4 part of water reducing agent (0.2 part of naphthalene water reducing agent, 0.2 part of sodium lignosulfonate water reducing agent), 0.3 part of water retention agent (0.15 part of hydroxyethyl propyl cellulose ether and 0.15 part of hydroxymethyl propyl starch ether), 0.3 part of interface activator (0.15 part of potassium silicate and 0.15 part of sodium hydroxide), 0.5 part of complexing agent (ethylene diamine tetramethylene sodium phosphate), 25 parts of surface film forming agent (20 percent of solid content), acrylamide-heptadecafluorodecyl acrylate copolymer, 13.5 percent of acrylamide, 86.5 percent of heptadecafluorodecyl acrylate and the like are calculated according to parts by weight, 0.4 part of fiber (0.4 part of polyvinyl alcohol fiber, the fiber length is 10mm), 6 parts of latex powder (3 parts of styrene-butadiene copolymer and 3 parts of ethylene-vinyl acetate copolymer) and 450 parts of water.
The preparation method of the melamine-formaldehyde resin modified reclaimed machine-made sand comprises the following steps:
10-50 parts of melamine, 3-50 parts of formaldehyde and 50-250 parts of water, adjusting the pH value to be alkaline, and stirring for 3-250min at 35-90 ℃ to obtain a melamine-formaldehyde resin prepolymer;
dispersing 30-300 parts of regenerated machine-made sand in 75-750 parts of alcohol solution, adding melamine-formaldehyde prepolymer, heating and stirring at 35-95 ℃ for 15-300min under the condition that the pH value is acidic (1-6.9), reducing the temperature to room temperature, and drying to obtain melamine-formaldehyde resin modified natural river sand or melamine-formaldehyde resin modified regenerated machine-made sand.
The preparation steps of the multi-source waste residue-based concrete 3D printing material are as follows:
s1: 30 parts of portland cement (P.O 32.5.5 parts of cement), 70 parts of aluminate cement, 300 parts of solid waste cementing material (150 parts of steel slag, 120 parts of fly ash and 30 parts of slag), 300 parts of functionalized fine aggregate (melamine-formaldehyde resin modified natural river sand), 0.4 part of water reducing agent (naphthalene water reducing agent 0.2 part, lignosulfonate sodium salt water reducing agent 0.2 part), 0.3 part of water retaining agent (hydroxyethyl propyl cellulose ether 0.15 part, hydroxymethyl propyl starch ether 0.15 part), 0.5 part of complexing agent (ethylene diamine tetra-methylene sodium phosphate), 6 parts of latex powder (styrene-butadiene copolymer 3 parts, ethylene-vinyl acetate copolymer 3 parts), 25 parts of surface film forming agent (solid content 20%, acrylamide-heptadecafluorodecyl acrylate copolymer, acrylamide content 13.5%, heptadecafluorodecyl acrylate content 86.5%), 0.4 part of fiber (polyvinyl alcohol fiber 0.4 part), fiber length 10mm) was stirred in a stirrer at 200 rpm/min for 5 minutes to obtain a solid powdery mixture;
s2, dissolving the interface activator (potassium silicate 0.15 parts, sodium hydroxide 0.15 parts) in 450 parts of water, and stirring at 100 rpm/min for 6 minutes to obtain an interface activator solution;
s3: and adding the interface activator solution into the solid powder mixture, and stirring at 350 rpm/min for 8 minutes to obtain the multi-source waste residue-based concrete 3D printing material.
Example 4
A multisource waste residue-based concrete 3D printing material comprises, by weight, 35 parts of Portland cement (P.O 42.5.5 cement), 65 parts of aluminate cement, 400 parts of solid waste cementing materials (150 parts of steel slag, 150 parts of fly ash and 100 parts of slag), 300 parts of functionalized fine aggregates (150 parts of polyurethane modified natural river sand and 150 parts of polydopamine modified regeneration machine sand), 0.4 part of water reducing agent (0.2 part of naphthalene water reducing agent, 0.1 part of sodium lignosulfonate water reducing agent and 0.1 part of polycarboxylic acid water reducing agent), 0.4 part of water retaining agent (0.2 part of hydroxymethyl propyl cellulose ether and 0.2 part of hydroxymethyl propyl starch ether), 0.4 part of interface excitant (0.2 part of sodium silicate and 0.2 part of sodium hydroxide), 0.4 part of complexing agent (triethanolamine), 15 parts of surface film forming agent (30% of solid content, 30% of methacrylamide-pentafluoropropyl methacrylate copolymer and 10.0% of methacrylamide content, 90.0 percent of pentafluoropropyl methacrylate), 0.4 part of fiber (0.2 part of polyvinyl alcohol fiber, the fiber length is 10 mm; 0.2 part of Kevlar fiber with the diameter of 6mm), 4 parts of latex powder (2 parts of styrene-butadiene copolymer and 2 parts of tertiary ethylene carbonate copolymer) and 540 parts of water.
The preparation method of the polydopamine modified regeneration machine-made sand comprises the following steps:
drying the regenerated machine-made sand, preparing 0.01-10g/L dopamine solution, adjusting the pH value to 7-11, dispersing the regenerated machine-made sand powder in the dopamine solution, stirring for 0.2-20h, filtering and drying a sample to obtain polydopamine modified natural river sand or polydopamine modified regenerated machine-made sand;
the preparation method of the polyurethane modified natural river sand comprises the following steps:
2-10 parts of pentaerythritol is dissolved in 3-150 parts of dimethyl sulfoxide, 5-25 parts of 2, 4-toluene-diisocyanate and 75-375 parts of 1,4 dioxane are added, 60-300 parts of fine aggregate of natural river sand, 150-7501,4 dioxane, 0.6-3 parts of span-80 and 0.25-1.25 parts of triethylene diamine are added after uniform stirring, and after heating reaction for a certain time (80 ℃ for 2-15 hours), filtration is carried out to obtain the polyurethane modified natural river sand.
The preparation steps of the multi-source waste residue-based concrete 3D printing material are as follows:
s1: 35 parts of portland cement (P.O 42.5.5 parts of cement), 65 parts of aluminate cement, 400 parts of solid waste cementing material (150 parts of steel slag, 150 parts of fly ash and 100 parts of slag), 300 parts of functionalized fine aggregate (150 parts of polyurethane modified natural river sand and 150 parts of polydopamine modified regeneration machine-made sand), 0.4 part of water reducing agent (0.2 part of naphthalene water reducing agent, 0.1 part of sodium lignosulfonate water reducing agent and 0.1 part of polycarboxylic acid water reducing agent), 0.4 part of water retaining agent (0.2 part of hydroxymethyl propyl cellulose ether and 0.2 part of hydroxymethyl propyl starch ether), 0.4 part of complexing agent (triethanolamine), 4 parts of latex powder (2 parts of styrene-butadiene copolymer and 2 parts of tertiary ethylene carbonate copolymer), 15 parts of surface film forming agent (30 percent of solid content, methacrylamide-pentafluoropropyl methacrylate copolymer, 10.0 percent of methacrylamide and 90.0 percent of pentafluoropropyl methacrylate), 0.4 part of a fiber (0.2 part of a polyvinyl alcohol fiber, a fiber length of 10 mm; 0.2 part of a Kevlar fiber, 6mm) was stirred in a stirrer at 150 rpm/min for 6 minutes to obtain a solid powdery mixture;
s2, dissolving the interface activator (sodium silicate 0.2 part, sodium hydroxide 0.2 part) in 540 parts of water, and stirring at 150 rpm/min for 6 minutes to obtain an interface activator solution;
s3: and adding the interface activator solution into the solid powder mixture, and stirring at 450 rpm/min for 9 minutes to obtain the multi-source waste residue-based concrete 3D printing material.
Example 5
30 parts of portland cement (P.O 42.5.5 cement), 70 parts of aluminate cement, 400 parts of solid waste cementing material (250 parts of steel slag and 150 parts of fly ash), 300 parts of functionalized fine aggregate (polyurethane modified recycled sand), 0.4 part of water reducing agent (0.2 part of naphthalene water reducing agent, 0.2 part of polycarboxylic acid water reducing agent), 0.4 part of water retaining agent (0.2 part of hydroxymethyl propyl cellulose ether, 0.1 part of hydroxymethyl propyl starch ether and 0.1 part of hydroxyethyl propyl starch ether), 0.4 part of interface activator (0.3 part of sodium silicate and 0.1 part of sodium hydroxide), 0.7 part of complexing agent (0.5 part of ethylene diamine tetramethylene sodium phosphate and 0.2 part of polyhydroxyacrylic acid), 28 parts of surface film forming agent (solid content 40 percent), and octafluoropentyl methacrylate copolymer, 8.0 percent of methacrylic acid and 92.0 percent of octafluoropentyl methacrylate by weight, 0.4 part of fiber (0.2 part of polyethylene fiber, the fiber length of which is 6 mm; 0.2 part of carbon fiber, which is 6mm), 5 parts of latex powder (2 parts of styrene-butadiene copolymer, 2 parts of ethylene versatate copolymer and 1 part of ethylene-vinyl acetate copolymer) and 580 parts of water.
The preparation method of the polydopamine modified natural river sand or the polydopamine modified reclaimed machine-made sand comprises the following steps:
drying natural river sand or reclaimed machine-made sand, preparing 0.01-10g/L dopamine solution, adjusting the pH value to 7-11, dispersing natural river sand or reclaimed machine-made sand powder in the dopamine solution, stirring for 0.2-20h, filtering and drying a sample to obtain polydopamine modified natural river sand or polydopamine modified reclaimed machine-made sand;
the preparation method of the polyurethane modified reclaimed machine-made sand comprises the following steps:
2-10 parts of pentaerythritol are dissolved in 3-150 parts of dimethyl sulfoxide, 5-25 parts of 2, 4-toluene-diisocyanate and 75-375 parts of 1,4 dioxane are added, after uniform stirring, 60-300 parts of fine aggregate of regenerative mechanism river sand, 150-7501,4 dioxane, 0.6-3 parts of span-80 and 0.25-1.25 parts of triethylene diamine are added, and after heating reaction for a certain time (80 ℃ for 2-15 hours), filtration is carried out, thus obtaining the polyurethane modified regenerative mechanism sand.
The preparation steps of the multi-source waste residue-based concrete 3D printing material are as follows:
s1: 30 parts of Portland cement (P.O 42.5.5 parts of cement), 75 parts of aluminate cement, 400 parts of solid waste cementing material (250 parts of steel slag and 150 parts of fly ash), 300 parts of functional fine aggregate (polyurethane modified regeneration machine sand), 0.4 part of water reducing agent (0.2 part of naphthalene water reducing agent and 0.2 part of polycarboxylic acid water reducing agent), 0.4 part of water retaining agent (0.2 part of hydroxymethyl propyl cellulose ether, 0.1 part of hydroxymethyl propyl starch ether and 0.1 part of hydroxyethyl propyl starch ether), 0.7 part of complexing agent (0.5 part of ethylene diamine tetra (methylene) sodium phosphate and 0.2 part of polyhydroxyacrylic acid), 5 parts of latex powder (2 parts of styrene-butadiene copolymer, 2 parts of tertiary ethylene carbonate copolymer and 1 part of ethylene-vinyl acetate copolymer), 28 parts of surface film forming agent (solid content 40%, methacrylic acid-octafluoropentyl methacrylate copolymer and 8.0% of methacrylic acid, 92.0 percent of octafluoropentyl methacrylate), 0.4 part of fiber (0.2 part of polyethylene fiber, the fiber length is 6 mm; 0.2 part of carbon fiber, 6mm) was stirred in a stirrer at 160 rpm/min for 7 minutes to obtain a solid powdery mixture;
s2, dissolving the interface activator (sodium silicate 0.3 part, sodium hydroxide 0.1 part) in 580 parts of water, and stirring at 180 rpm/min for 7 minutes to obtain an interface activator solution;
s3: and adding the interface activator solution into the solid powdery mixture, and stirring at 400 rpm/min for 12 minutes to obtain the multi-source waste residue-based concrete 3D printing material.
Test of
The parameters of the 3D printing multi-source waste residue-based concrete obtained in the embodiments 1 to 5, such as the setting time, the fluidity, the flexural strength and the compressive strength, are respectively tested, and the concrete steps are as follows:
preparation of a test piece: the size of the test piece is 40 x 160mm, the specific manufacturing method refers to GB/T17671-2020 cement mortar strength test method (ISO method), and the test piece is maintained to the test age under the conditions that the temperature is 20 +/-2 ℃ and the relative humidity is 95%.
Condensing the test piece: refer to the regulation in GB/T50080-2016 Standard test method for the Performance of common concrete mixtures.
Fluidity: refer to the regulation in GB/T50448-2015 technical Specification for application of cement-based grouting materials.
Flexural strength and compressive strength: refer to the regulation in GB/TGB/T17671-2000 method for testing the strength of cement mortar (ISO method).
And (3) test results: the results of setting time, fluidity, breaking strength, compressive strength, toughness measurement, and interlayer adhesion strength are shown in Table 1.
Table 1: results of Performance testing
Figure BDA0003445932070000131
Figure BDA0003445932070000141
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention and are intended to be equivalent substitutions are included in the scope of the present invention.

Claims (10)

1. The multi-source waste residue based concrete 3D printing material is characterized in that the multi-source waste residue based concrete 3D printing material comprises the following raw materials in parts by weight: 10-80 parts of Portland cement, 20-70 parts of aluminate cement, 500 parts of solid waste cementing material 300-containing materials, 500 parts of functional fine aggregate 200-containing materials, 0.2-0.5 part of water reducing agent, 0.1-0.5 part of water-retaining agent, 0.1-0.4 part of interface excitant, 0.4-0.8 part of complexing agent, 0.2-3.0 parts of surface film-forming agent, 0.2-0.6 part of fiber, 2-8 parts of latex powder and 200-880 parts of water.
2. The multi-source waste residue-based concrete 3D printing material as claimed in claim 1, wherein the portland cement is one or more of P.O32.5 cement and P.O42.5 cement mixed in any proportion.
3. The multi-source waste residue-based concrete 3D printing material as claimed in claim 1, wherein the solid waste gel material is one or more of fly ash, steel slag and slag mixed according to any proportion, the specific surface area is 400-1000m2/kg, and the screen residue of 45 μm square hole is less than 1.5%.
4. The multi-source waste residue-based concrete 3D printing material as claimed in claim 1, wherein the functionalized fine aggregate is one or more of polydopamine modified natural river sand, polyurethane modified natural river sand, melamine-formaldehyde resin modified natural river sand, polydopamine modified recycled machine-made sand, polyurethane modified recycled machine-made sand and melamine-formaldehyde resin modified recycled machine-made sand mixed in any proportion;
the preparation method of the polydopamine modified natural river sand or the polydopamine modified reclaimed machine-made sand comprises the following steps:
drying natural river sand or reclaimed machine-made sand, preparing 0.01-10g/L dopamine solution, adjusting the pH value to 7-11, dispersing natural river sand or reclaimed machine-made sand powder in the dopamine solution, stirring for 0.2-20h, filtering and drying a sample to obtain polydopamine modified natural river sand or polydopamine modified reclaimed machine-made sand;
the preparation method of the polyurethane modified natural river sand or polyurethane modified reclaimed machine-made sand comprises the following steps:
2-10 parts of pentaerythritol is dissolved in 3-150 parts of dimethyl sulfoxide, 5-25 parts of 2, 4-toluene-diisocyanate and 75-375 parts of 1, 4-dioxane are added, 60-300 parts of natural river sand or fine aggregate of reclaimed machine-made sand, 150-7501, 4-dioxane, 0.6-3 parts of span-80 and 0.25-1.25 parts of triethylene diamine are added after uniform stirring, and after heating reaction for a certain time (80 ℃ for 2-15 hours), filtration is carried out to obtain polyurethane modified natural river sand or polyurethane modified reclaimed machine-made sand;
the preparation method of the melamine-formaldehyde resin modified natural river sand or the melamine-formaldehyde resin modified reclaimed machine-made sand comprises the following steps:
10-50 parts of melamine, 3-50 parts of formaldehyde and 50-250 parts of water, adjusting the pH value to be alkaline, and stirring for 3-250min at 35-90 ℃ to obtain a melamine-formaldehyde resin prepolymer;
dispersing 30-300 parts of natural river sand or reclaimed machine-made sand in 75-750 parts of alcohol solution, adding melamine-formaldehyde prepolymer, heating and stirring at 35-95 ℃ for 15-300min under the condition that the pH value is acidic (1-6.9), reducing the temperature to room temperature, and drying to obtain the melamine-formaldehyde resin modified natural river sand or melamine-formaldehyde resin modified reclaimed machine-made sand.
5. The multi-source waste residue-based concrete 3D printing material of claim 1, wherein the water reducing agent is one or more of a naphthalene water reducing agent, a sodium lignosulfonate water reducing agent and a polycarboxylic acid water reducing agent which are mixed according to any proportion, and the complexing agent is one or more of sodium ethylene diamine tetracetate, triethanolamine, sodium ethylene diamine tetracarboxymethylidene phosphate and polyhydroxyacrylic acid which are mixed according to any proportion.
6. The multi-source waste based concrete 3D printing material as claimed in claim 1, wherein the interface activator is one or more of sodium silicate, potassium silicate, sodium hydroxide and potassium hydroxide mixed in any proportion, and the water retention agent is one or more of hydroxymethyl propyl cellulose ether, hydroxyethyl propyl cellulose ether, hydroxymethyl propyl starch ether and hydroxyethyl propyl starch ether mixed in any proportion.
7. The multisource slag-based concrete 3D printing material according to claim 1, wherein the surface film-forming agent is an emulsion copolymerization system with certain hydrophilic-lipophilic characteristics, the solid content of the emulsion copolymerization system is 5-50%, the mass ratio of hydrophilic chain segments in the emulsion copolymer is 0.5-13.5%, the mass ratio of lipophilic chain segments is 86.5-99.5%, and the hydrophilic chain segments are one or more of acrylic acid, acrylamide, methacrylic acid and methacrylamide; the oleophilic chain segment is one or a combination of more of methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, amyl acrylate, hexyl acrylate, octyl acrylate, trifluoroethyl acrylate, pentafluoropropyl acrylate, octafluoropentyl acrylate, heptadecafluorononyl acrylate, heptadecafluorodecyl acrylate, trifluoroethyl methacrylate, pentafluoropropyl methacrylate, octafluoropentyl methacrylate, heptadecafluorononyl methacrylate and heptadecafluorodecyl methacrylate.
8. The multi-source waste residue based concrete 3D printing material as claimed in claim 1, wherein the fiber is one or more of polyethylene fiber, polyvinyl alcohol fiber, polypropylene fiber, carbon fiber and Kevlar fiber mixed according to any proportion, and the fiber length is 2-15 mm.
9. The multi-source waste residue-based concrete 3D printing material of claim 1, wherein the latex powder is one or more of styrene-butadiene copolymer, ethylene versatate copolymer and ethylene-vinyl acetate copolymer which are mixed according to any proportion.
10. The preparation method of the multi-source waste residue-based concrete 3D printing material according to claims 1-9, characterized by comprising the following steps:
s1: stirring portland cement, aluminate cement, a solid waste cementing material, functional fine aggregate, a water reducing agent, a water retaining agent, latex powder, a complexing agent and fiber in a stirrer at 200-300 rpm/min for 5-10 minutes to obtain a solid powdery mixture;
s2, dissolving the interface activator in water, and stirring at 100-300 rpm/min for 5-8 min to obtain an interface activator solution;
s3: adding the interface activator solution into the solid powdery mixture, and stirring at 300-500 rpm/min for 5-15 minutes to obtain the multi-source waste residue-based concrete 3D printing material.
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