CN111153646A - Seawater sea sand concrete material for 3D printing - Google Patents
Seawater sea sand concrete material for 3D printing Download PDFInfo
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- CN111153646A CN111153646A CN201911399177.2A CN201911399177A CN111153646A CN 111153646 A CN111153646 A CN 111153646A CN 201911399177 A CN201911399177 A CN 201911399177A CN 111153646 A CN111153646 A CN 111153646A
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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
- C04B28/02—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
- C04B28/04—Portland cements
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- 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
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00181—Mixtures specially adapted for three-dimensional printing (3DP), stereo-lithography or prototyping
Abstract
The invention provides a preparation method of a seawater sea sand concrete material for 3D printing. The invention also provides a seawater sea sand concrete product and a preparation method thereof. The invention fully utilizes abundant seawater and sea sand resources in coastal regions of China, researches a novel seawater and sea sand concrete material for 3D printing, and solves the problem of green construction and construction of a concrete structure in a severe marine environment. The 3D printing intelligent construction technology is combined with seawater and sea sand concrete, the seawater and sea sand concrete material meeting the 3D printing requirement is prepared through the optimized design of a formula of the seawater and sea sand concrete and based on the compounding of an auxiliary cementing material, the toughening of synthetic plastic fibers and the blending of additives, and the seawater and sea sand concrete material can be used for the development of the intelligent construction technology and the ocean engineering in the field of civil engineering in the future, so that the application of the invention has higher social benefit and practical significance, and the technology can be popularized to military engineering.
Description
Technical Field
The invention belongs to the technical field of civil engineering materials, and relates to a seawater and seawater sand concrete material for 3D printing and a preparation method of a seawater and seawater sand concrete product.
Background
With the rapid development of industrial technologies, 3D printing technology has been widely used in the fields of machine manufacturing and medical health. In recent years, 3D printing technology is also developed in the field of intelligent construction, concrete materials are mainly used as printing ink in the 3D printing construction technology, concrete products meeting requirements are printed according to program parameter setting, the 3D printing construction technology has remarkable advantages in the aspects of special-shaped member construction, unmanned construction in severe environments and the like, a large amount of labor cost is saved, and personal safety of construction workers is guaranteed. With the transformation and upgrading requirements of the building industry and the popularization of the industrialization technology, the 3D printing intelligent construction technology is an important development direction for the development of the building industry in the future. However, the 3D printing construction has some problems that must be solved, such as the mismatch of the properties of the concrete material for printing and the adhesion between different printing ink layers, which seriously affect the safety of the printed concrete member and limit the development of the 3D printing construction technology. Therefore, the concrete material suitable for 3D printing construction needs to be researched and developed urgently, so that the concrete material has working performance, mechanical property and durability meeting the intelligent construction requirements.
China is wide in territory, coastlines are long, and coastal areas have abundant seawater and sea sand resources. Meanwhile, because of the limited exploitation of natural resources and the shortage of the supply of natural sandstone aggregate, the seawater and the sea sand are taken as building materials and are safely applied to the building engineering, which is a hotspot and difficulty of the research of the building materials at the present stage; the seawater and sea sand concrete also has wide application prospect in the military industry fields of offshore protection and the like. Particularly, the seawater and the sea sand contain abundant chloride ions, so that the reinforcing steel bars in the prepared seawater and sea sand concrete are corroded, and the durability of the prepared seawater and sea sand concrete is rapidly degraded; however, the incorporation of chloride salts increases the early strength of the concrete and is beneficial to the concrete to some extent. How to overcome the defects of the seawater and sea sand concrete and fully utilize the beneficial influence of the seawater and sea sand concrete is a difficult point in the research and application of the seawater and sea sand concrete.
Disclosure of Invention
The invention focuses on the future development trend of civil engineering technology and materials, combines a 3D printing intelligent construction technology with a seawater sea sand concrete material, and discloses a seawater sea sand concrete material for 3D printing, a seawater sea sand concrete product and a production method thereof. According to the invention, the specificity and the use safety of different materials are fully considered, the seawater sea sand concrete meeting the 3D printing requirement is prepared through the optimized design of the mixing proportion, and the seawater sea sand concrete products (including test pieces, sectional materials and members) are further printed and molded, so that the seawater sea sand concrete has excellent durability, mechanical property and structural safety.
Specifically, the technical scheme of the invention is as follows:
the invention provides a seawater and sea sand concrete material for 3D printing, which comprises the following components in parts by weight:
cement: 100 parts of (A);
active coral powder: 10-100 parts;
sea water: 30-150 parts;
sea sand: 100 portions and 600 portions;
synthetic fibers: 0.5-20 parts;
redispersible latex powder: 1-20 parts;
cellulose: 0.1-4 parts;
polycarboxylic acid water reducing agent: 0.1-4 parts;
air entraining agent: 0.01-0.2 portion.
Further, the seawater sea sand concrete material for 3D printing comprises the following components in parts by weight:
cement: 100 parts of (A);
active coral powder: 20-50 parts;
sea water: 40-90 parts;
sea sand: 200-500 parts;
synthetic fibers: 1-5 parts;
redispersible latex powder: 3-12 parts;
cellulose ether: 0.5-3 parts;
polycarboxylic acid water reducing agent: 0.5-3 parts;
air entraining agent: 0.05 to 0.15 portion.
Furthermore, the seawater sea sand concrete material for 3D printing comprises the following components in parts by weight:
cement: 100 parts of (A);
active coral powder: 30-40 parts;
sea water: 60-80 parts;
sea sand: 300-400 parts;
synthetic fibers: 2-3 parts of a solvent;
redispersible latex powder: 5-10 parts;
cellulose ether: 1-2 parts;
polycarboxylic acid water reducing agent: 1-2 parts;
air entraining agent: 0.08-0.12 part.
Further, the cement is selected from portland cement or ordinary portland cement. The ordinary portland cement is a hydraulic cementing material prepared by grinding portland cement clinker, 5-20% of mixed materials and a proper amount of gypsum. Has the characteristics of high strength, large hydration heat, good freezing resistance, small dry shrinkage, good wear resistance, good carbonization resistance and the like.
Furthermore, the strength grade of the cement is more than or equal to 32.5 grade.
Preferably, the strength grade of the cement is selected from one of 42.5 grade or 52.5 grade.
Furthermore, the active coral powder is an auxiliary cementing material with a volcanic ash effect, which is prepared by drying and grinding coral.
Furthermore, the coral used by the active coral powder is derived from an island reef in the offshore area and is easy to obtain; the auxiliary cementing material with volcanic ash effect is prepared by drying and grinding coral, and the maximum grain size is less than or equal to 150 mu m.
Preferably, the maximum grain size of the active coral powder is less than or equal to 45 μm and is in continuous gradation.
Further, the seawater is from coastal sea area, and is rich in Na+，K+，Ca2+，Mg2+And Sr2+Cation, and Cl-And SO4 2-An anion.
Furthermore, the seawater is natural seawater from coastal areas in China.
Furthermore, special seawater drawing and storing equipment is required, the temperature of the obtained seawater is kept below 10 ℃, acid and odor caused by rapid proliferation of microorganisms are avoided, and the preparation time from the seawater to the concrete is not more than 5 days.
Preferably, the temperature of the obtained seawater is kept at 5 ℃, and the preparation time of the concrete obtained from the seawater is not more than 2 days.
Furthermore, the sea sand is directly obtained in coastal areas of China, and the particle size is below 4.75 mm.
Furthermore, the sea sand performance should meet the specification of sea sand physical performance indexes in the technical specification for sea sand concrete application (JGJ 206-2010).
Further, the synthetic fiber is plastic fiber, and further, the synthetic fiber is selected from polypropylene fiber, polyester fiber or polyamide fiber;
preferably, the synthetic fibers are high modulus polyethylene fibers, the modulus of elasticity ranges from 91 to 140N/tex, and the fiber length ranges from 1 to 5 mm.
Further, the cellulose ether and the redispersible latex powder are concrete admixture;
furthermore, the redispersible latex powder should meet the technical regulations of the national label "latex for mortar and concrete and redispersible latex powder" (GB T34557-2017).
Furthermore, the cellulose ether can be methyl cellulose ether, hydroxyethyl methyl cellulose ether or carboxymethyl cellulose ether, so that the prepared seawater and sea sand concrete material has good cohesiveness and working performance.
Further, the polycarboxylic acid water reducing agent and the air entraining agent are concrete admixtures.
Further, the polycarboxylate water reducer is a conventionally used polycarboxylate water reducer and is commercially available.
Preferably, the polycarboxylic acid water reducing agent is a naphthalene water reducing agent. Specifically, the polycarboxylate superplasticizer is produced by Jiangsu Subot new material Co
Naphthalene series high efficiency water reducing agent.
Furthermore, the air entraining agent is a powdery material, has good water solubility, and can be selected from rosin resins, alkyl benzene sulfonates and fatty alcohol sulfonates.
Preferably, the air entraining agent is a rosin resin additive.
The second aspect of the invention discloses a method for preparing the seawater sea sand concrete material for 3D printing, which comprises the following steps: weighing the components according to the weight parts of the components, uniformly stirring the components after weighing, and obtaining the seawater sea sand concrete material for 3D printing after metering and stirring the components.
Further, the method comprises the following steps:
1) respectively weighing cement, active coral powder, sea sand, redispersible latex powder and cellulose ether according to the weight part ratio, and stirring to obtain a ready-mixed compound;
2) respectively weighing seawater, a polycarboxylic acid water reducing agent, an air entraining agent and synthetic fibers according to the weight part ratio; adding water, a polycarboxylic acid water reducing agent and an air entraining agent into the premixed compound obtained in the step 1) for stirring, and adding synthetic fibers in batches in the stirring process to obtain a final mixture, namely the seawater sea sand concrete material for 3D printing.
Further, the stirring time in the step 1) is 1-3 minutes; preferably, the stirring time in step 1) is 2 minutes.
Furthermore, in the step 2), the time of the second stirring is more than or equal to 2 minutes. Preferably, the stirring time of the second stirring is 3 minutes.
Further, in the step 2), the synthetic fiber is fed in batches 3 to 5 times. The synthetic fibers are uniformly dispersed after being stirred and mixed.
Further, in step 2), the slump of the final blend is 30-180 mm. Preferably, the slump of the final blend is 50-100 mm. Most preferably, the slump of the final blend is 60. + -.5 mm.
The third aspect of the invention discloses the application of the seawater sea sand concrete material for 3D printing or the method in 3D printing construction. Specifically, the application of the seawater and sea sand concrete mixture is as follows: and 3D printing technology is combined, and based on an intelligent control system and parameter setting, the seawater sea sand concrete product meeting the requirements is printed.
The invention discloses a seawater sea sand concrete product formed by using a 3D printing technology, wherein the seawater sea sand concrete product is prepared by using the seawater sea sand concrete material for 3D printing as a raw material.
Further, the preparation method of the seawater sea sand concrete product comprises the following steps: based on the parameter setting of concrete member, combine 3D printing apparatus through intelligence control system, print out sea water sea sand concrete product.
Further, the maintenance method of the seawater sea sand concrete product is natural maintenance or standard maintenance.
Further, the curing is standard curing, the temperature of the standard curing is (20 +/-2) ° c, the humidity of the standard curing is (90 +/-5)%, and the curing age of the standard curing is 28 days.
The fifth aspect of the invention discloses the application of the seawater sea sand concrete product in the technical field of civil engineering materials.
On the basis of the common general knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily without departing from the concept and the protection scope of the invention.
According to the seawater and sea sand concrete material for 3D printing and the preparation method thereof, provided by the invention, cement, active coral powder, seawater, sea sand, synthetic fibers, re-dispersible latex powder, cellulose and an additive are used as main raw materials, seawater and sea sand concrete meeting the 3D printing construction requirement is prepared by mixing, and seawater and sea sand concrete products with different specifications are printed on the basis of a set program and target parameters, so that the seawater and sea sand concrete material has good durability, mechanical property and structural safety after being maintained.
Compared with the prior art, the invention has the following beneficial effects:
(1) the seawater sea sand concrete material for 3D printing and the preparation method thereof provided by the invention combine seawater sea sand which is difficult to utilize at the present stage and has huge storage with an intelligent construction technology. The seawater sea sand concrete material for 3D printing is a novel green building material and has the characteristics of wide material source, low preparation cost and the like. The invention is particularly applicable to marine defense engineering, and construction of offshore concrete buildings/structures in extreme environments.
(2) The seawater and the sea sand are widely distributed in coastal areas and are easy to obtain, the popularization and the application of the seawater and the sea sand in the building engineering can reduce the exploitation of natural sandstone aggregates and fresh water resources, and the environmental benefit and the social benefit are obvious.
(3) Considering that seawater and sea sand contain abundant chloride, the seawater and sea sand concrete is an excellent concrete material for 3D printing aiming at the improvement characteristic of the chloride on the early strength of concrete and the requirement of a 3D printing concrete material on the early strength. However, the problems of reinforcement corrosion and durability degradation and the like in concrete caused by the doping of seawater and sea sand are solved by using the fiber toughening technology to apply the synthetic plastic fiber to the preparation of the seawater and sea sand concrete material, so that the adverse effect of the doping of seawater and sea sand is eliminated.
(4) The doped fiber obviously improves the interface performance between different printing ink layers of the 3D printing material, improves the integrity and the safety of a formed product, and fundamentally breaks through the technical problem of restricting 3D printing construction through the optimal design of the mixing proportion.
(5) By doping the redispersible latex powder, the cellulose and the high-performance polycarboxylate superplasticizer, the working performance of the seawater sea sand concrete is optimized, and the requirements of concrete materials for 3D printing construction are met; by doping the air entraining agent, a closed pore structure is formed, and the durability of the 3D printing concrete material and the construction is further improved.
Detailed Description
The technical solutions of the present invention are described in detail below with reference to examples, but the present invention is not limited to the scope of the examples.
The starting materials referred to in the following examples are commercially available. The processing equipment or apparatus not specifically mentioned is conventional in the art.
Furthermore, it is to be understood that one or more method steps mentioned in the present invention does not exclude that other method steps may also be present before or after the combined steps or that other method steps may also be inserted between these explicitly mentioned steps, unless otherwise indicated; it is also to be understood that a combined connection between one or more devices/apparatus as referred to in the present application does not exclude that further devices/apparatus may be present before or after the combined device/apparatus or that further devices/apparatus may be interposed between two devices/apparatus explicitly referred to, unless otherwise indicated. Moreover, unless otherwise indicated, the numbering of the various method steps is merely a convenient tool for identifying the various method steps, and is not intended to limit the order in which the method steps are arranged or the scope of the invention in which the invention may be practiced, and changes or modifications in the relative relationship may be made without substantially changing the technical content.
The main technical scheme of the invention is as follows:
the preparation process of the seawater sea sand concrete material for 3D printing and the product thereof comprises the following steps:
100 parts of cement, 10-100 parts of active coral powder, 100 parts of sea sand and 600 parts of sea sand, 0.5-20 parts of synthetic fiber, 1-20 parts of redispersible latex powder and 0.1-4 parts of cellulose ether are measured and stirred for the first time for 1-3 minutes to obtain a premixed compound. Wherein the preferable scheme is that the cement comprises 100 parts of cement, 20-50 parts of active coral powder, 500 parts of sea sand 200-sand, 1-5 parts of synthetic fiber, 3-12 parts of redispersible latex powder and 0.5-3 parts of cellulose ether. Most preferably 100 parts of cement, 30-40 parts of active coral powder, 60-80 parts of seawater, 400 parts of sea sand, 2-3 parts of synthetic fiber, 5-10 parts of redispersible latex powder and 1-2 parts of cellulose ether.
Weighing 30-150 parts of seawater, 0.1-4 parts of polycarboxylic acid water reducing agent and 0.01-0.2 part of air entraining agent, adding the materials into a pre-mixed material, stirring and mixing for the second time for more than or equal to 2 minutes, adding 0.5-20 parts of synthetic fiber in batches for 3-5 times in the second stirring process to obtain a final mixture, wherein the slump of the final mixture is 30-180mm, preferably 50-100mm, and preferably 50 +/-5 mm. Obtaining the required seawater sea sand concrete material. Wherein, the preferable scheme is that 40-90 parts of seawater, 0.5-3 parts of polycarboxylic acid water reducing agent and 0.05-0.15 part of air entraining agent are added with 1-5 parts of synthetic fiber in batches for 3-5 times in the second stirring process. The most preferable scheme is that 60-80 parts of seawater, 1-2 parts of polycarboxylic acid water reducing agent and 0.08-0.12 part of air entraining agent are added into 2-3 parts of high elastic modulus polyethylene fiber in batches for 3-5 times in the second stirring process.
Wherein the strength grade of the cement is more than or equal to 32.5 grade; preferably, the strength grade of the cement is selected from one of 42.5 grade or 52.5 grade. Grading the active coral powder according to active coral powder of active coral powder used in cement and concrete (GB/T1596-017) in accordance with the national reference standard, wherein the quality grade of the active coral powder is not lower than two grades; preferably, the quality grade of the active coral powder is first-grade active coral powder. The seawater is natural seawater in coastal areas of China; preferably, special seawater drawing and storing equipment is equipped, the temperature of the obtained seawater is kept below 10 ℃, and the preparation time of the concrete obtained from the seawater is not more than 5 d; further preferably, the temperature of the obtained seawater is kept at 5 ℃, and the preparation of the concrete from the seawater is not more than 2 d. The sea sand is from coastal areas of China, and the maximum grain size is less than 4.75 mm; preferably, the sea sand performance should meet the specification of the sea sand concrete application technical specification (JGJ 206-. The synthetic fiber is synthetic plastic fiber, such as polypropylene fiber, polyester fiber, polyamide fiber, etc.; preferably, the synthetic fiber is high elastic modulus polyethylene fiber, the elastic modulus ranges from 91 to 140N/tex, and the fiber length ranges from 1 to 5 mm; the redispersible latex powder meets the technical regulation of the national label of latex for mortar and concrete and redispersible latex powder (GB T34557-2017). The cellulose ether can be methyl cellulose ether, hydroxyethyl methyl cellulose ether or carboxymethyl cellulose ether. The polycarboxylate superplasticizer is a conventionally used polycarboxylate superplasticizer and can be purchased from the market; preferably, the polycarboxylic acid water reducing agent is a naphthalene water reducing agent. Specifically, the polycarboxylate superplasticizer is produced by Jiangsu Subot new material Co
Naphthalene series high efficiency water reducing agent. The air entraining agent is a powdery material, has good water solubility, and can be selected from rosin resins, alkyl benzene sulfonates and fatty alcohol sulfonates; preferably, the air-entraining agent is a rosin resin-based additive.
And printing the prepared seawater sea sand concrete material layer by a 3D printer according to a specifically set programming program to obtain a seawater sea sand concrete product for 3D printing construction. And (3) curing the seawater sea sand concrete product, wherein the curing mode is natural curing or standard curing, preferably standard curing, the temperature of the standard curing is 18-22 ℃, the humidity of the standard curing is 85-95%, and the curing age of the standard curing is 28 days.
Comparative example 1
Weighing 150 parts of cement, 400 parts of river sand, 3 parts of synthetic fiber, 50 parts of redispersible latex powder and 5 parts of cellulose ether according to the weight part ratio of the common concrete material for 3D printing, and stirring for the first time for 2 minutes to obtain a ready-mixed compound. And then, metering 75 parts of tap water, 1.2 parts of a polycarboxylic acid water reducing agent and 0.2 part of an air entraining agent, adding the obtained mixture into a pre-mixed mixture, stirring and mixing for the second time, wherein the stirring time is 3 minutes, so as to obtain a final mixture, and the slump of the final mixture is 60 +/-5 mm. And then, taking the obtained final mixture as a 3D printing ink material for construction, automatically printing a concrete test piece with the length, width and height of 400mm, 100mm and 100mm by using 3D printing equipment according to set forming, and curing for 28D to obtain the 3D printing common concrete test piece No. 1.
Comparative example 2
According to the weight portion proportion of the common concrete material for 3D printing, 100 portions of cement, 50 portions of active coral powder, 400 portions of river sand, 50 portions of redispersible latex powder and 5 portions of cellulose ether are weighed and stirred for the first time for 2 minutes to obtain a ready-mixed compound. And then, metering 75 parts of tap water, 1.2 parts of a polycarboxylic acid water reducing agent and 0.2 part of an air entraining agent, adding the obtained mixture into a pre-mixed mixture, stirring and mixing for the second time, wherein the stirring time is 3 minutes, so as to obtain a final mixture, and the slump of the final mixture is 60 +/-5 mm. And then, taking the obtained final mixture as a 3D printing ink material for construction, automatically printing a concrete test piece with the length, width and height of 400mm, 100mm and 100mm by using 3D printing equipment according to set forming, and curing for 28D to obtain the 3D printing common concrete test piece No. 2.
Comparative example 3
According to the weight portion ratio of the seawater and sea sand concrete material, 100 portions of cement, 50 portions of active coral powder, 400 portions of river sand, 3 portions of synthetic fiber, 50 portions of redispersible latex powder and 5 portions of cellulose ether are weighed and stirred for the first time for 2 minutes to obtain a ready-mixed compound. And then 75 parts of tap water, 1.2 parts of polycarboxylic acid water reducing agent and 0.2 part of air entraining agent are measured and added into a pre-mixed compound for second stirring and mixing, the mixing time is 3 minutes, a final mixture is obtained, the slump of the final mixture is 60 +/-5 mm, then the mixture is used as an ink material, a 3D printing device is utilized to automatically print a concrete test piece with the length, width, height, 400mm and 100mm, and after 28D curing, the 3D printed seawater sea sand concrete test piece 3# is obtained.
Example 1
The implementation discloses a preparation method of a fiber-reinforced seawater and sea sand concrete material for 3D printing, which comprises the following steps: weighing 100 parts of cement, 50 parts of active coral powder, 400 parts of sea sand, 3 parts of synthetic fiber, 50 parts of redispersible latex powder and 5 parts of cellulose ether according to the weight parts, and stirring for the first time for 2 minutes to obtain a ready-mixed compound. And then 75 parts of seawater, 1.2 parts of polycarboxylic acid water reducing agent and 0.2 part of air entraining agent are measured and added into a pre-mixed compound for stirring and mixing for the second time, the mixing time is 3 minutes, a final mixture is obtained, the slump of the final mixture is 60 +/-5 mm, then the mixture is used as an ink material, a concrete test piece with the length, width, height, 400mm, 100mm and 100mm is automatically printed by using 3D printing equipment according to set forming, and after 28D curing, the fiber reinforced seawater sea sand concrete test piece for 3D printing is obtained, namely, the No. 4 model.
Example 2
The implementation discloses a preparation method of a fiber-reinforced seawater and sea sand concrete material for 3D printing, which comprises the following steps: according to the weight portion ratio, 120 portions of cement, 30 portions of active coral powder, 400 portions of sea sand, 6 portions of synthetic fiber, 50 portions of redispersible emulsion powder and 5 portions of cellulose ether are measured and stirred for the first time for 2 minutes to obtain a ready-mixed compound. And then 75 parts of seawater, 1.2 parts of polycarboxylic acid water reducing agent and 0.2 part of air entraining agent are measured and added into a pre-mixed compound for stirring and mixing for the second time, the mixing time is 3 minutes, a final mixture is obtained, the slump of the final mixture is 60 +/-5 mm, then the mixture is used as an ink material, a concrete test piece with the length, width, height, 400mm, 100mm and 100mm is automatically printed by using 3D printing equipment according to set forming, and after 28D curing, the fiber reinforced seawater sea sand concrete test piece for 3D printing is obtained, namely 5 #.
Example 3
The implementation discloses a preparation method of a fiber-reinforced seawater and sea sand concrete material for 3D printing, which comprises the following steps: according to the weight portion ratio, 120 portions of cement, 10 portions of active coral powder, 400 portions of sea sand, 12 portions of synthetic fiber, 50 portions of redispersible latex powder and 5 portions of cellulose ether are measured and stirred for the first time for 2 minutes to obtain a ready-mixed compound. And then 75 parts of seawater, 1.2 parts of polycarboxylic acid water reducing agent and 0.2 part of air entraining agent are measured and added into a pre-mixed compound for stirring and mixing for the second time, the mixing time is 3 minutes, a final mixture is obtained, the slump of the final mixture is 60 +/-5 mm, then the mixture is used as an ink material, a concrete test piece with the length, width, height, 400mm, 100mm and 100mm is automatically printed by using 3D printing equipment according to set forming, and after 28D curing, the fiber reinforced seawater sea sand concrete test piece for 3D printing 6# is obtained.
Firstly, the mechanical properties and the durability of the concrete materials printed in the comparative examples 1 to 3 and the examples 1 to 3 are tested, and the test results of the compressive strength, the flexural strength, the carbonization depth and the chloride ion diffusion coefficient are shown in table 1, so that the 3D printed seawater sea sand concrete material provided by the invention has good mechanical properties and durability.
TABLE 13D printed concrete base Material Properties
| Content of test | Comparative example 1 | Comparative example 2 | Comparative example 3 | Example 1 | Example 2 | Example 3 |
| 3d compressive Strength (MPa) | 27 | 23 | 26 | 25 | 27 | 29 |
| 28d compressive Strength (MPa) | 38 | 33 | 34 | 35 | 36 | 38 |
| 28d breaking strength (MPa) | 3.8 | 3.2 | 3.7 | 3.6 | 3.9 | 4.2 |
| 28d carbonization property (mm) | 12 | 16 | 15 | 16 | 13 | 12 |
| Diffusion coefficient of chloride ion (0)-12m2/s) | 12.5 | 12.3 | 12.4 | 12.4 | 12.1 | 11.8 |
In addition, a mechanical universal mechanical testing machine is used for carrying out structural failure tests on the test pieces 1-3# (comparison example) and the test pieces 4-6# (embodiment examples 1-3), and the test results show that the 3D printing common concrete test piece and the seawater sea sand concrete test piece have similar bending failure strength, so that the seawater and the sea sand are suitable for being used as 3D printing materials and are suitable for intelligent construction. Particularly, comparing the results of examples 1-3 and comparative example 1, the 3D printing seawater sea sand concrete test piece prepared by the formulation of the present invention has a bending failure strength improved by 350% compared with that of ordinary concrete, and the interface adhesive property is improved by about 2 times, because the fiber toughening effect enables the 3D printing construction to have more excellent overall properties and mechanical properties.
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 should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. The seawater sea sand concrete material for 3D printing is characterized by comprising the following components in parts by weight:
cement: 100 parts of (A);
active coral powder: 10-100 parts;
sea water: 30-150 parts;
sea sand: 100 portions and 600 portions;
synthetic fibers: 0.5-20 parts;
redispersible latex powder: 1-20 parts;
cellulose ether: 1-4 parts;
polycarboxylic acid water reducing agent: 0.1-4 parts;
air entraining agent: 0.01-0.2 portion.
2. The seawater sea sand concrete material for 3D printing according to claim 1, characterized by comprising any one or more of the following conditions:
A1) the cement is selected from portland cement or ordinary portland cement;
A2) the active coral powder is an auxiliary cementing material with a volcanic ash effect, which is prepared by drying and grinding coral;
A3) the seawater is from coastal sea area, and is rich in Na+，K+，Ca2+，Mg2+And Sr2+Cation, and Cl-And SO4 2-An anion;
A4) the sea sand is directly obtained in coastal areas of China, and the maximum grain size is below 4.75 mm;
A5) the synthetic fiber is plastic fiber; preferably, the synthetic fibers are selected from polypropylene fibers, polyester fibers or polyamide fibers;
A6) the cellulose ether and the redispersible latex powder are concrete admixtures;
A7) the polycarboxylic acid water reducing agent and the air entraining agent are concrete admixtures.
3. The method for preparing the seawater sea sand concrete material for 3D printing according to any one of claims 1 to 2 is characterized in that the seawater sea sand concrete material for 3D printing is obtained by weighing the components according to the weight parts, uniformly stirring the weighed components and stirring the components in a metering manner.
4. A method according to claim 3, characterized by the steps of:
1) weighing cement, active coral powder, sea sand, redispersible latex powder and cellulose ether according to the weight part ratio, and fully stirring to obtain a ready-mixed compound;
2) respectively weighing seawater, a polycarboxylic acid water reducing agent, an air entraining agent and synthetic fibers according to the weight part ratio; adding water, a polycarboxylic acid water reducing agent and an air entraining agent into the premixed compound obtained in the step 1) for stirring, and adding synthetic fibers in batches in the stirring process to obtain a final mixture, namely the seawater sea sand concrete material for 3D printing.
5. The method according to claim 4, wherein the synthetic fiber is fed in batches 3 to 5 times in step 2).
6. Use of the seawater sea sand concrete material for 3D printing according to claims 1-2 or the method of any one of claims 3-5 in 3D printing construction.
7. A seawater sea sand concrete product formed by using a 3D printing technology, characterized in that the seawater sea sand concrete product for 3D printing according to claims 1-2 is prepared by using the seawater sea sand concrete material as a raw material.
8. The seawater sea sand concrete product of claim 7, wherein the preparation method comprises: based on the parameter setting of concrete target product, combine 3D printing apparatus through intelligence control system, print out sea water sea sand concrete product.
9. The seawater sea sand concrete product of claim 7, wherein the curing method of the seawater sea sand concrete product is natural curing or standard curing.
10. Use of a seawater sea sand concrete product as claimed in any one of claims 7 to 9 in the technical field of civil engineering materials.
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