CN113277829A - Magnesium oxychloride cement-based material, sand prevention and fixation plate and preparation method thereof - Google Patents
Magnesium oxychloride cement-based material, sand prevention and fixation plate and preparation method thereof Download PDFInfo
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- CN113277829A CN113277829A CN202110750265.3A CN202110750265A CN113277829A CN 113277829 A CN113277829 A CN 113277829A CN 202110750265 A CN202110750265 A CN 202110750265A CN 113277829 A CN113277829 A CN 113277829A
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- oxychloride cement
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- 239000000463 material Substances 0.000 title claims abstract description 105
- 239000004568 cement Substances 0.000 title claims abstract description 100
- IQYKECCCHDLEPX-UHFFFAOYSA-N chloro hypochlorite;magnesium Chemical compound [Mg].ClOCl IQYKECCCHDLEPX-UHFFFAOYSA-N 0.000 title claims abstract description 88
- 230000002265 prevention Effects 0.000 title claims abstract description 46
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims abstract description 107
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 70
- 238000010146 3D printing Methods 0.000 claims abstract description 56
- 229910001629 magnesium chloride Inorganic materials 0.000 claims abstract description 53
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 32
- 239000000835 fiber Substances 0.000 claims abstract description 29
- 230000008719 thickening Effects 0.000 claims abstract description 23
- 239000013008 thixotropic agent Substances 0.000 claims abstract description 23
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 22
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 19
- DHRRIBDTHFBPNG-UHFFFAOYSA-L magnesium dichloride hexahydrate Chemical compound O.O.O.O.O.O.[Mg+2].[Cl-].[Cl-] DHRRIBDTHFBPNG-UHFFFAOYSA-L 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 17
- 238000010276 construction Methods 0.000 claims abstract description 14
- 238000003756 stirring Methods 0.000 claims description 21
- 238000002156 mixing Methods 0.000 claims description 13
- 238000009826 distribution Methods 0.000 claims description 9
- 239000002253 acid Substances 0.000 claims description 7
- 238000004140 cleaning Methods 0.000 claims description 7
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 7
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 7
- 239000012802 nanoclay Substances 0.000 claims description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 5
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 3
- 239000004743 Polypropylene Substances 0.000 claims description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 3
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 claims description 3
- 229920005551 calcium lignosulfonate Polymers 0.000 claims description 3
- 239000004917 carbon fiber Substances 0.000 claims description 3
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- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 3
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 3
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- -1 polypropylene Polymers 0.000 claims description 3
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- RYAGRZNBULDMBW-UHFFFAOYSA-L calcium;3-(2-hydroxy-3-methoxyphenyl)-2-[2-methoxy-4-(3-sulfonatopropyl)phenoxy]propane-1-sulfonate Chemical compound [Ca+2].COC1=CC=CC(CC(CS([O-])(=O)=O)OC=2C(=CC(CCCS([O-])(=O)=O)=CC=2)OC)=C1O RYAGRZNBULDMBW-UHFFFAOYSA-L 0.000 claims description 2
- 239000013530 defoamer Substances 0.000 claims description 2
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- 241000196324 Embryophyta Species 0.000 description 2
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- 235000007164 Oryza sativa Nutrition 0.000 description 2
- 241000209140 Triticum Species 0.000 description 2
- 235000021307 Triticum Nutrition 0.000 description 2
- 230000009471 action Effects 0.000 description 2
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- 230000003628 erosive effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
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- 238000010008 shearing Methods 0.000 description 2
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- 235000014676 Phragmites communis Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
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- 238000003475 lamination Methods 0.000 description 1
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- 230000001050 lubricating effect Effects 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- 235000014380 magnesium carbonate Nutrition 0.000 description 1
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Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/30—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 magnesium cements or similar cements
- C04B28/32—Magnesium oxychloride cements, e.g. Sorel cement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/001—Rapid manufacturing of 3D objects by additive depositing, agglomerating or laminating of material
-
- 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
- B33Y10/00—Processes of additive manufacturing
-
- 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
- B33Y70/00—Materials specially adapted for additive manufacturing
- B33Y70/10—Composites of different types of material, e.g. mixtures of ceramics and polymers or mixtures of metals and biomaterials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/30—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 magnesium cements or similar cements
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00732—Uses not provided for elsewhere in C04B2111/00 for soil stabilisation
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Composite Materials (AREA)
- Soil Sciences (AREA)
- Paleontology (AREA)
- Mechanical Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides a magnesium oxychloride cement-based material, a sand prevention and fixation plate and a preparation method thereof, wherein the magnesium oxychloride cement-based material comprises magnesium chloride, fine sand, bischofite, a water reducing agent, a thickening and water retaining agent, a thixotropic agent, a defoaming agent and fibers. The magnesium oxychloride cement-based material provided by the invention has the characteristics of high fluidity and adaptability to extrusion printing, high early strength of the material in the printing process, and good adhesion between printing layers, can be used for the construction operation of 3D printing sand-prevention and sand-fixation plates at room temperature of 15-45 ℃, and can achieve the purposes of waste utilization and ecological environment improvement.
Description
Technical Field
The invention relates to the technical field of 3D printing of sand prevention and fixation boards, in particular to a magnesium oxychloride cement-based material, a sand prevention and fixation board and a preparation method thereof.
Background
The key of desert control is sand prevention and fixation, and the main modes of desert control at home and abroad at present are physical sand fixation (such as stone grids and soil grids) and biological sand fixation (such as plant cultivation). Several common sand-fixing means are for example: the grass grid sand barrier is a wind-shield wall which is made of wheat straw, rice straw, reed and other materials and is bundled on a moving dune to form a grid shape so as to weaken the erosion of wind power. The grass grid sand barrier has low cost, simple construction and high sand prevention and fixation efficiency. However, most of the materials of the sand barrier are wheat straws or rice straws, the service life of the sand barrier for preventing wind and sand is generally about 3-4 years, and the frequent replacement of the grass grid sand barrier can also bring about the consumption of manpower, material resources and financial resources. The stone grid sand-fixing barrier is formed by piling pebbles on a sand dune into ridges with the height of 20-30 meters, the distance of 1-2 meters and the direction perpendicular to the wind direction, and has the advantages of simple sand-fixing construction, good sand-fixing effect, high cost and temporary sand prevention for desert areas requiring long-distance stone transportation and the like. The high molecular or chemical sand fixing method such as sand blocking net has good wind erosion resistance, water resistance and freeze thawing resistance, but part of high molecular sand fixing material is easy to decompose after being irradiated by strong ultraviolet rays and sunlight in desert areas, thereby causing secondary pollution.
Accordingly, the prior art is yet to be improved and developed.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a magnesium oxychloride cement-based material, a sand prevention and fixation plate and a preparation method thereof, and aims to solve the problems of short service life, high cost, poor effect, easiness in causing secondary pollution and the like of the sand prevention and fixation material in the prior art.
The technical scheme of the invention is as follows:
the magnesium oxychloride cement-based material comprises magnesium chloride, fine sand, bischofite, a water reducing agent, a thickening and water retaining agent, a thixotropic agent, a defoaming agent and fibers.
The magnesium oxychloride cement-based material comprises the following components in parts by weight: 5-40 parts of magnesium chloride, 30-85 parts of fine sand, 5-25 parts of bischofite, 0.1-1.5 parts of water reducing agent, 0.1-0.5 part of thickening and water retaining agent, 0.1-2.5 parts of thixotropic agent, 0.1-0.5 part of defoaming agent and 0.1-2.0 parts of fiber.
The magnesium oxychloride cement-based material is characterized in that the water reducing agent is one or two of a calcium lignosulphonate water reducing agent and a polycarboxylic acid high-efficiency water reducing agent.
The magnesium oxychloride cement-based material is characterized in that the thixotropic agent is one or more of nano clay, organic bentonite and magnesium aluminum silicate.
The magnesium oxychloride cement-based material is characterized in that the thickening and water retaining agent is one or more of carboxymethyl hydroxyethyl cellulose, polyacrylamide and hydroxypropyl methyl cellulose ether.
The magnesium oxychloride cement-based material is characterized in that the defoaming agent is one or two of polyethers and higher alcohols.
The magnesium oxychloride cement-based material is characterized in that the fibers are one or more of carbon fibers, polyvinyl alcohol fibers and polypropylene fibers.
The preparation method of the magnesium oxychloride cement-based material comprises the following steps:
mixing bischofite with water to prepare a magnesium chloride solution;
adding a water reducing agent, a thickening and water retaining agent, a defoaming agent and water into the magnesium chloride solution in sequence, and stirring and mixing uniformly by using a magnetic stirrer to obtain a mixed magnesium chloride solution;
uniformly stirring magnesium chloride, fine sand, a thixotropic agent and fibers in a forced paste-cleaning stirrer according to a certain proportion to prepare a powdery cement-based material;
and pouring the mixed magnesium chloride solution into the powdery cement-based material in batches, and stirring and mixing to obtain the magnesium oxychloride cement-based material.
The sand prevention and fixation plate is prepared by 3D printing of the magnesium oxychloride cement-based material.
A preparation method of a sand prevention and fixation plate comprises the following steps:
setting a sand fixing plate size drawing by using computer drawing software, and guiding the sand fixing plate size drawing into a printer by using slicing software;
the magnesium oxychloride cement-based material is conveyed to a 3D printer nozzle by a conveying pump, and is combined with intelligent material distribution of a 3D printer control system to carry out 3D printing construction of the sand prevention and fixation plate.
Has the advantages that: the magnesium oxychloride cement base material provided by the invention has wide source and low cost, and the main components of the magnesium oxychloride cement base material are magnesium chloride, fine sand and bischofite (MgCl)2·6H2O), the magnesium oxychloride cement has high setting and hardening speed, excellent binding property (good binding power with inorganic aggregate fine sand) and good wear resistance and corrosion resistance. The hydration of magnesium oxychloride cement can be divided into 3 processes of crystal nucleation, crystal growth, phase boundary reaction and diffusion. The hydration product is predominantly 5-phase, e.g. 2Mg (OH)2·MgCl2·4H2O、2Mg(OH)2·MgCl2·2H2O and 9Mg (OH)2·MgCl2·5H2O, also in small amounts Mg (OH)2. The magnesium oxychloride cement-based material can be used for preparing the sand prevention and fixation plate through a 3D printing process, the manufacturing time is short, manual reverse molding is not needed, the installation is convenient (installation hole sites can be reserved according to drawing design), the organic combination of building 3D printing and desert control is realized, and the mature advanced manufacturing technology of building 3D printing can be used for economically, conveniently, quickly and massively manufacturing the wind prevention and fixation plate; the magnesium oxychloride cement-based material sand prevention and fixation plate based on 3D printing is installed on the surface of a desert to form a cross grid, occupies a small area, does not influence the growth of plants in the desert, organically combines chemical sand fixation and physical sand fixation, plays a role in sand fixation, keeps the growth of plants, and improves the ecological environment.
Drawings
FIG. 1 is a flow chart of a preferred embodiment of a method for preparing a magnesium oxychloride cement-based material of the present invention.
FIG. 2 is a design diagram of a sand prevention and fixation plate based on 3D printing and made of magnesium oxychloride cement-based material.
Fig. 3 is a schematic view of the installation layout of the sand prevention and fixation plate based on 3D printing of the magnesium oxychloride cement-based material of the invention.
Detailed Description
The invention provides a magnesium oxychloride cement-based material, a sand prevention and fixation plate and a preparation method thereof, and the invention is further explained in detail below in order to make the purpose, technical scheme and effect of the invention clearer and more clear. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
3D printing is also called additive manufacturing, in the manufacturing process, a designed three-dimensional CAD mathematical model is applied, and a computer or a microprocessor controls a 3D printer to quickly and accurately stack parts with complex structures, parts with different finished products or complete finished products layer by layer. 3D printing can not be limited by the difficulty in processing or incapability of processing in the traditional process, and the processing period of a finished product with a complex structure is greatly shortened. The 3D printing of the building is the application of the 3D printing in the building field, and refers to the production and manufacture of building models, sand table models, whole houses, villas, building blocks, components and the like by the 3D printing technology. 3D prints the shower nozzle that has a bigger supply and extrude semifluid printing material in the architectural equipment, also called and beats the printer head. The 3D printing construction equipment nozzle prints and sprays semi-fluid construction materials layer by layer on a certain track path. The semi-fluid material can be a mixed material of different materials, and can also be special concrete, and common concrete is also commonly used as a printing material.
The invention provides a magnesium oxychloride cement-based material, which comprises magnesium chloride, fine sand, bischofite, a water reducing agent, a thickening and water retaining agent, a thixotropic agent, a defoaming agent and fibers.
The magnesium oxychloride cement-based material provided by the invention has the advantages of high setting and hardening speed, excellent bonding property (good bonding force with inorganic aggregate fine sand) and good wear resistance and corrosion resistance; the hydration of magnesium oxychloride cement can be divided into 3 processes of crystal nucleation, crystal growth, phase boundary reaction and diffusion. The hydration product is mainly phase 5, 2Mg (OH)2·MgCl2·4H2O、2Mg(OH)2·MgCl2·2H2O and 9Mg (OH)2·MgCl2·5H2O，Small amounts of Mg (OH) are also present2. The magnesium oxychloride cement-based material can be used for preparing the sand prevention and fixation plate through a 3D printing process, the manufacturing time is short, manual reverse molding is not needed, the installation is convenient (installation hole sites can be reserved according to drawing design), the organic combination of building 3D printing and desert control is realized, and the mature advanced manufacturing technology of building 3D printing can be used for economically, conveniently, quickly and massively manufacturing the wind prevention and fixation plate; the magnesium oxychloride cement-based material sand prevention and fixation plate based on 3D printing is installed on the surface of a desert to form a cross grid, occupies a small area, does not influence the growth of plants in the desert, organically combines chemical sand fixation and physical sand fixation, plays a role in sand fixation, keeps the growth of plants, and improves the ecological environment.
In some specific embodiments, the magnesium oxychloride cement-based material comprises, in parts by weight: 5-40 parts of magnesium chloride, 30-85 parts of fine sand, 5-25 parts of bischofite, 0.1-1.5 parts of water reducing agent, 0.1-0.5 part of thickening and water retaining agent, 0.1-2.5 parts of thixotropic agent, 0.1-0.5 part of defoaming agent and 0.1-2.0 parts of fiber.
In this embodiment, the water reducing agent added to the magnesium oxychloride cement-based material is one or two of a calcium lignosulfonate water reducing agent and a polycarboxylic acid high-efficiency water reducing agent, but is not limited thereto. The water reducing agent molecules can be adsorbed on the surfaces of cement particles in an oriented mode, so that the surfaces of the cement particles normally carry a negative charge to form an electrostatic repulsion effect, the cement particles are mutually dispersed, a flocculation structure is damaged, and wrapped part of water is released to participate in flowing. And the two additives have strong hydrophilicity, the formed adsorption film can form a stable intermolecular film with water molecules, the extrusion friction force is reduced, the fluidity and the workability are improved, the continuous extrusion performance is good, and the material feeding is continuous without material breaking.
In this embodiment, the thickening and water-retaining agent added to the magnesium oxychloride cement-based material is one or more of carboxymethyl hydroxyethyl cellulose, polyacrylamide and hydroxypropyl methyl cellulose ether, but is not limited thereto. The main action mechanism of the thickening and water-retaining agent is as follows: the hydrophobic main chain is associated with the surrounding water molecules through hydrogen bonds, so that the fluid volume of the polymer is increased, the free movement space of particles is reduced, and the viscosity of the system is increased. The increase in viscosity can also be achieved by entanglement of the molecular chains, as indicated by high viscosity at static and low shear, and low viscosity at high shear. The material has good plastic deformation resistance and bonding property, and the phenomena of lateral deformation and large gaps among layers cannot occur in the printing process, so that potential safety hazards for the sand-proof sand-fixing plate are avoided.
In this embodiment, the thixotropic agent added to the magnesium oxychloride cement-based material is one or more of nanoclay, organobentonite, and magnesium aluminum silicate, but is not limited thereto. The thixotropic agent can form a hydrogen bond or a large specific surface area of some other structure with a polymer, and is characterized in that the cement slurry becomes thin under the action of shearing force and becomes thick after standing without the shearing force. The lubricating agent has the functions of lubricating, reducing the relative viscosity, improving the rheological property of the system, improving the yield value of the system and having obvious thixotropic thickening effect. The thixotropic agent additive increases the pumpability and the constructability, prevents the slurry from deforming and collapsing after extrusion printing, and ensures the volume stability of the sand-proof sand-fixing plate product.
In this embodiment, the fibers added to the magnesium oxychloride cement-based material are one or more of carbon fibers, polyvinyl alcohol fibers and polypropylene fibers, but are not limited thereto. The fiber can wrap more aggregates, has tight binding force with a cement matrix, has a disorderly distribution form which is greatly beneficial to weakening the stress of the cement matrix during plastic shrinkage and freeze thawing, and the shrinkage energy is dispersed to the fiber monofilament with high tensile strength and relatively low elastic modulus, so that the generation and development of micro cracks are inhibited, and the toughness and the crack resistance of the neat paste are effectively enhanced.
In some embodiments, the defoamer is one or both of polyethers and higher alcohols, but is not limited thereto; the chloromagnesite is prepared by calcining magnesite or dolomite ore; the fine sand is obtained by sieving the fine sand with a 80-mesh sieve from desert.
In some embodiments, as shown in fig. 1, there is also provided a method of making a magnesium oxychloride cement-based material, comprising the steps of:
s10, mixing bischofite with water to prepare a magnesium chloride solution;
s20, sequentially adding a water reducing agent, a thickening and water retaining agent, a defoaming agent and water into the magnesium chloride solution, and uniformly stirring and mixing by using a magnetic stirrer to obtain a mixed magnesium chloride solution;
s30, uniformly stirring magnesium chloride, fine sand, a thixotropic agent and fibers in a forced pulp-cleaning stirrer according to a proportion to prepare a powdery cement-based material;
and S40, pouring the mixed magnesium chloride solution into the powdery cement-based material in batches, and stirring and mixing to obtain the magnesium oxychloride cement-based material.
Based on the magnesium oxychloride cement-based material, the invention also provides a sand prevention and fixation plate which is prepared by 3D printing of the magnesium oxychloride cement-based material.
Further, the invention also provides a preparation method of the sand prevention and fixation plate, which comprises the following steps: setting a sand fixing plate size drawing by using computer drawing software, and guiding the sand fixing plate size drawing into a printer by using slicing software; the magnesium oxychloride cement-based material is conveyed to a 3D printer nozzle by a conveying pump, and is combined with intelligent material distribution of a 3D printer control system to carry out 3D printing construction of the sand prevention and fixation plate.
Specifically, as shown in fig. 2, the sand control and fixation plate is designed by using computer drawing software to have the following dimensions: the length is multiplied by the width and multiplied by the height is 400mm multiplied by 40mm, and then the paper is guided into a printer by using special slicing software; and 3D printing clean slurry of the prepared magnesium oxychloride cement 3D is connected to a 3D printer nozzle by utilizing a conveying pump conveying pipeline, and 3D printing construction of a sand fixing plate made of a magnesium oxychloride cement-based material is carried out by combining intelligent material distribution of a 3D printer control system.
The magnesium oxychloride cement-based material sand fixing plate based on 3D printing provided by the invention has the advantages of simple manufacturing process, short manufacturing time, no need of manual reverse molding, convenience in installation (installation hole sites can be reserved according to drawing design), and realization of organic combination of building 3D printing and desert control, so that the mature advanced manufacturing technology of building 3D printing can be used for economically, conveniently, rapidly and massively manufacturing the wind-proof sand fixing plate. As shown in figure 3, the sand prevention and fixation plate based on the 3D printed magnesium oxychloride cement-based material is installed on the surface of a desert to form a cross grid, occupies a small area, does not influence the growth of plants inherent to the desert, organically combines chemical sand fixation and physical sand fixation, not only plays a role in sand fixation, but also keeps the growth of the plants and improves the ecological environment.
The sand-preventing and sand-fixing board and the preparation method and performance thereof of the present invention are further explained by the following specific examples:
example 1
Preparing the following substances in parts by weight: 8 parts of magnesium chloride, 80 parts of fine sand and bischofite (MgCl)2·6H2O)8 parts, water reducing agent 0.5 part, thickening and water retaining agent 0.2 part, thixotropic agent 1.0 part, defoaming agent 0.3 part, fiber 1.0 part and water 25 parts.
Adding bischofite (MgCl)2·6H2O) preparing a magnesium chloride solution with water;
sequentially adding a water reducing agent (polycarboxylic acid high-efficiency water reducing agent), a thickening and water retaining agent (hydroxypropyl methyl cellulose ether) and a defoaming agent (higher alcohol) into the prepared magnesium chloride solution, and stirring for 2min by using a magnetic stirrer to uniformly mix to obtain a mixed magnesium chloride solution for later use;
uniformly stirring magnesium chloride, fine sand, a thixotropic agent (nano clay) and fibers in a forced pulp-cleaning stirrer for 3min according to a proportion to obtain a powdery magnesium oxychloride cement-based material;
pouring the obtained mixed magnesium chloride solution into powdery magnesium oxychloride cement-based material in batches, stirring and mixing for 3min to prepare magnesium oxychloride cement 3D printing paste;
the manufacturing method of the sand prevention and sand fixation plate based on the 3D printing magnesium oxychloride cement-based material is characterized in that the sand prevention and sand fixation plate using computer drawing software has the following dimensions: the length × width × height is 400mm × 400mm × 40mm, and then the sheet is introduced into the printer by using dedicated cutting software.
And 3D printing the prepared magnesium oxychloride cement 3D printing paste to be connected to a 3D printer nozzle by using a conveying pump conveying pipeline, and performing 3D printing construction on the sand prevention and solidification board of the magnesium oxychloride cement-based material by combining intelligent material distribution of a 3D printer control system.
The sand prevention and fixation plate made by the method based on 3D printing is arranged on the sand surface in a ten-square-grid manner, and plays a role in sand prevention and fixation.
Example 2
Preparing the following substances in parts by weight: 38 portions of magnesium chloride, 38 portions of fine sand and bischofite (MgCl)2·6H2O)19 parts, water reducing agent 1.1 parts, thickening and water retaining agent 0.2 parts, thixotropic agent 1.5 parts, defoaming agent 0.2 parts, fiber 2.0 parts and water 35 parts.
Adding bischofite (MgCl)2·6H2O) preparing a magnesium chloride solution with water;
sequentially adding a water reducing agent (polycarboxylic acid high-efficiency water reducing agent), a thickening and water retaining agent (hydroxypropyl methyl cellulose ether) and a defoaming agent (higher alcohol) into the prepared magnesium chloride solution, and stirring for 2min by using a magnetic stirrer to uniformly mix to obtain a mixed magnesium chloride solution for later use;
uniformly stirring magnesium chloride, fine sand, a thixotropic agent (nano clay) and fibers in a forced pulp-cleaning stirrer for 3min according to a proportion to obtain a powdery magnesium oxychloride cement-based material;
pouring the obtained mixed magnesium chloride solution into powdery magnesium oxychloride cement-based material in batches, stirring and mixing for 3min to prepare magnesium oxychloride cement 3D printing paste;
and 3D printing the prepared magnesium oxychloride cement 3D printing paste to be connected to a 3D printer nozzle by using a conveying pump conveying pipeline, and performing 3D printing construction on the sand prevention and solidification board of the magnesium oxychloride cement-based material by combining intelligent material distribution of a 3D printer control system.
The manufacturing method of the sand prevention and fixation plate based on the 3D printing magnesium oxychloride cement-based material is characterized in that the sand fixation plate using computer drawing software has the following dimensions: the length × width × height is 400mm × 400mm × 40mm, and then the sheet is introduced into the printer by using dedicated cutting software.
The sand prevention and fixation plate made by the method based on 3D printing is arranged on the sand surface in a ten-square-grid manner, and plays a role in sand prevention and fixation.
Example 3
Preparing the following substances in parts by weight: 9 parts of magnesium chloride, 75 parts of fine sand and bischofite (MgCl)2·6H2O)12 parts, water reducing agent 1.2 parts, thickening and water retaining agent 0.3 part, thixotropic agent 1.2 parts, defoaming agent 0.3 part, fiber 1.0 part and water 28 parts.
Adding bischofite (MgCl)2·6H2O) preparing a magnesium chloride solution with water;
sequentially adding a water reducing agent (polycarboxylic acid high-efficiency water reducing agent), a thickening and water retaining agent (hydroxypropyl methyl cellulose ether) and a defoaming agent (higher alcohol) into the prepared magnesium chloride solution, and stirring for 2min by using a magnetic stirrer to uniformly mix to obtain a mixed magnesium chloride solution for later use;
uniformly stirring magnesium chloride, fine sand, a thixotropic agent (nano clay) and fibers in a forced pulp-cleaning stirrer for 3min according to a proportion to obtain a powdery magnesium oxychloride cement-based material;
pouring the obtained mixed magnesium chloride solution into powdery magnesium oxychloride cement-based material in batches, stirring and mixing for 3min to prepare magnesium oxychloride cement 3D printing paste;
the manufacturing method of the sand prevention and fixation plate based on the 3D printing magnesium oxychloride cement-based material is characterized in that the sand fixation plate using computer drawing software has the following dimensions: the length × width × height is 400mm × 400mm × 40mm, and then the sheet is introduced into the printer by using dedicated cutting software.
And 3D printing the prepared magnesium oxychloride cement 3D printing paste to be connected to a 3D printer nozzle by using a conveying pump conveying pipeline, and performing 3D printing construction on the sand prevention and solidification board of the magnesium oxychloride cement-based material by combining intelligent material distribution of a 3D printer control system.
The sand prevention and fixation plate made by the method based on 3D printing is arranged on the sand surface in a ten-square-grid manner, and plays a role in sand prevention and fixation.
Example 4
Preparing the following substances in parts by weight: 14 parts of magnesium chloride, 60 parts of fine sand and bischofite (MgCl)2·6H2O)21 parts, water reducing agent 1.0 part, thickening and water retaining agent 0.3 part, thixotropic agent 2.2 parts, defoaming agent 0.2 part, fiber 1.3 parts and water 30 parts.
Adding bischofite (MgCl)2·6H2O) preparing a magnesium chloride solution with water;
sequentially adding a water reducing agent (polycarboxylic acid high-efficiency water reducing agent), a thickening and water retaining agent (hydroxypropyl methyl cellulose ether) and a defoaming agent (higher alcohol) into the prepared magnesium chloride solution, and stirring for 2min by using a magnetic stirrer to uniformly mix to obtain a mixed magnesium chloride solution for later use;
uniformly stirring magnesium chloride, fine sand, a thixotropic agent (nano clay) and fibers in a forced pulp-cleaning stirrer for 3min according to a proportion to obtain a powdery magnesium oxychloride cement-based material;
pouring the obtained mixed magnesium chloride solution into powdery magnesium oxychloride cement-based material in batches, stirring and mixing for 3min to prepare magnesium oxychloride cement 3D printing paste;
the manufacturing method of the sand prevention and fixation plate based on the 3D printing magnesium oxychloride cement-based material is characterized in that the sand fixation plate using computer drawing software has the following dimensions: the length × width × height is 400mm × 400mm × 40mm, and then the sheet is introduced into the printer by using dedicated cutting software.
And 3D printing the prepared magnesium oxychloride cement 3D printing paste to be connected to a 3D printer nozzle by using a conveying pump conveying pipeline, and performing 3D printing construction on the sand prevention and solidification board of the magnesium oxychloride cement-based material by combining intelligent material distribution of a 3D printer control system.
The sand prevention and fixation plate made by the method based on 3D printing is arranged on the sand surface in a ten-square-grid manner, and plays a role in sand prevention and fixation.
The performance of the prepared magnesium oxychloride cement-based material based on 3D printing is detected, and the result is as follows:
as can be seen from the data in the table, the magnesium oxychloride cement-based material prepared by the method has better compressive strength by testing the compressive strength of the magnesium oxychloride cement-based material in each stage of curing for 3d, 7d and 28 d. The magnesium oxychloride cement-based material prepared by the method has the advantages of excellent operable time, good early strength, continuous, uniform and smooth extrusion, good construction performance of lamination, fine and smooth printing surface and no cracking, and can be used for the construction operation of 3D printing sand prevention and fixation plates at the room temperature of 15-45 ℃.
In conclusion, the magnesium oxychloride cement-based material based on 3D printing is prepared according to the proportion in the formula, the magnesium oxychloride cement-based material has the advantages that the fluidity is suitable for extrusion printing, the early strength of the material is high in the printing process, and the binding force between printing layers is good.
It is to be understood that the foregoing description of specific exemplary embodiments of the invention has been presented for the purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The example embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various example embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (10)
1. The magnesium oxychloride cement-based material is characterized by comprising magnesium chloride, fine sand, bischofite, a water reducing agent, a thickening and water retaining agent, a thixotropic agent, a defoaming agent and fibers.
2. The magnesium oxychloride cement-based material of claim 1, comprising in parts by weight: 5-40 parts of magnesium chloride, 30-85 parts of fine sand, 5-25 parts of bischofite, 0.1-1.5 parts of water reducing agent, 0.1-0.5 part of thickening and water retaining agent, 0.1-2.5 parts of thixotropic agent, 0.1-0.5 part of defoaming agent and 0.1-2.0 parts of fiber.
3. The magnesium oxychloride cement-based material of any one of claims 1 to 2, wherein the water reducing agent is one or both of a calcium lignosulfonate water reducing agent and a polycarboxylic acid high efficiency water reducing agent.
4. The magnesium oxychloride cement-based material of any one of claims 1 to 2, wherein the thixotropic agent is one or more of nanoclay, organobentonite and magnesium aluminum silicate.
5. The magnesium oxychloride cement-based material of any one of claims 1 to 2, wherein the thickening and water retaining agent is one or more of carboxymethyl hydroxyethyl cellulose, polyacrylamide and hydroxypropyl methyl cellulose ether.
6. The magnesium oxychloride cement-based material of any one of claims 1 to 2, wherein the defoamer is one or both of a polyether and a higher alcohol.
7. The magnesium oxychloride cement-based material of any one of claims 1 to 2, wherein the fibers are one or more of carbon fibers, polyvinyl alcohol fibers and polypropylene fibers.
8. A method of producing a magnesium oxychloride cement-based material as claimed in any one of claims 1 to 7, which comprises the steps of:
mixing bischofite with water to prepare a magnesium chloride solution;
adding a water reducing agent, a thickening and water retaining agent, a defoaming agent and water into the magnesium chloride solution in sequence, and stirring and mixing uniformly by using a magnetic stirrer to obtain a mixed magnesium chloride solution;
uniformly stirring magnesium chloride, fine sand, a thixotropic agent and fibers in a forced paste-cleaning stirrer according to a certain proportion to prepare a powdery cement-based material;
and pouring the mixed magnesium chloride solution into the powdery cement-based material in batches, and stirring and mixing to obtain the magnesium oxychloride cement-based material.
9. A sand control and fixing board, characterized in that it is made of the magnesium oxychloride cement-based material according to any one of claims 1 to 7 by 3D printing.
10. A preparation method of a sand prevention and fixation plate is characterized by comprising the following steps:
setting a sand fixing plate size drawing by using computer drawing software, and guiding the sand fixing plate size drawing into a printer by using slicing software;
conveying the magnesium oxychloride cement-based material as claimed in claims 1 to 7 to a 3D printer nozzle by using a conveying pump, and performing 3D printing construction of the sand prevention and fixation plate by combining with intelligent material distribution of a 3D printer control system.
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| CN106747244A (en) * | 2017-03-16 | 2017-05-31 | 中国科学院青海盐湖研究所 | A kind of magnesia oxychloride cement sill, preparation method and its application in preventing and fixing sand |
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| CN106747244A (en) * | 2017-03-16 | 2017-05-31 | 中国科学院青海盐湖研究所 | A kind of magnesia oxychloride cement sill, preparation method and its application in preventing and fixing sand |
| CN106747248A (en) * | 2017-03-16 | 2017-05-31 | 中国科学院青海盐湖研究所 | A kind of is the sand-fixation method of binding agent based on magnesia oxychloride cement |
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Application publication date: 20210820 |