CN114656225B - Method for preparing 3D printing concrete - Google Patents
Method for preparing 3D printing concrete Download PDFInfo
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- CN114656225B CN114656225B CN202210172740.8A CN202210172740A CN114656225B CN 114656225 B CN114656225 B CN 114656225B CN 202210172740 A CN202210172740 A CN 202210172740A CN 114656225 B CN114656225 B CN 114656225B
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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
- C04B28/06—Aluminous 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
- B33Y10/00—Processes of additive manufacturing
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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
- B33Y70/10—Composites of different types of material, e.g. mixtures of ceramics and polymers or mixtures of metals and biomaterials
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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
- B33Y80/00—Products made by 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/02—Selection of the hardening environment
- C04B40/0231—Carbon dioxide hardening
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- 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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
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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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/52—Multiple coating or impregnating multiple coating or impregnating with the same composition or with compositions only differing in the concentration of the constituents, is classified as single coating or impregnation
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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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/60—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only artificial stone
- C04B41/61—Coating or impregnation
- C04B41/70—Coating or impregnation for obtaining at least two superposed coatings having different compositions
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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
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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Abstract
The invention discloses a method for preparing 3D printing concrete, which comprises the following steps: 1. printing a 3D printed concrete outline, then placing a steel bar and a porous steel pipe which are bound in advance in the middle of the 3D printed concrete outline, wherein the porous steel pipes are connected by flanges or threads; 2. and pouring light fine aggregate self-leveling concrete among the 3D printed concrete outlines. 3. CO2 2 Maintaining; 4. performing wet curing on the surface of the 3D printed concrete, and injecting water into the porous steel pipe for curing; 5) spraying a mixed solution of nano aluminum oxide and sodium silicate on the outer surface of the 3D printed concrete profile; porous fiber pipes are doped in the lightweight fine aggregate self-leveling concrete and the 3D printing concrete. On one hand, the problems of water shortage and poor maintenance in 3D printed concrete are solved; on the other hand, the problem that the bonding strength between the 3D printing concrete layers is low is solved.
Description
Technical Field
The invention relates to the field of 3D printed concrete, in particular to a method for preparing 3D printed concrete.
Background
The 3D printing technology is an emerging manufacturing technology that has been gradually developed in the late 80 s of the 20 th century, and is an automated construction technology, also called additive manufacturing, which is called the beginning of the "third industrial revolution". The basic principle is as follows: inputting the three-dimensional object model into a computer, slicing and layering the three-dimensional model by adopting slicing software, inputting codes of all layers into a 3D printer, and controlling 'ink' to print layer by layer through the software. In recent years, 3D printing is applied to various fields such as automobiles, aerospace, construction, biomedicine, food, and the like. With the continuous improvement of the technology, the application of the technology in the building industry is receiving wide attention. Compared with the traditional concrete construction process, the 3D printing concrete has unique advantages. Firstly, the construction cost can be greatly reduced by the template-free construction; secondly, the complex shape can be printed with high precision, and materials are saved to the maximum extent; in addition, because 3D printing is automatic construction, manpower can be saved and the construction time can be shortened. At present, the 3D printing technology applied in the building field mainly has three types: a D-type process, a profile process and a concrete printing process. Contour printing and concrete printing belong to extrusion molding and are mainstream technologies of 3D printing in the building field.
Although 3D printing technology has many advantages, the development of 3D printing in the architectural field has been limited. Layer-by-layer printing is the main characteristic of the 3D printing technology, and the integrity of the two continuous layers is poorer than that of integral pouring construction. The construction mode of layer-by-layer accumulation ensures that the printing component inevitably has weak interlayer bonding, if the printing component is not processed, the bonding performance at the interface is obviously lower than that of a matrix, thereby influencing the integrity and the structural use performance of the printing component. The interface between the weak bonding layers is a great challenge for influencing the popularization and application of the 3D printing component in the building industry. Systematic research is carried out aiming at the interface performance, the 3D printing component interface performance is comprehensively improved, and the problem that the 3D printing building needs to be solved urgently is solved.
In addition, in order to improve the plasticity of the 3D concrete, on one hand, an accelerator or a quick-hardening cementitious material is added to the 3D printed concrete, so that more ettringite hydration products are formed in the 3D concrete at an early stage, and on the other hand, the 3D printed concrete is also doped with a material with high water absorption: such as attapulgite, clay, recycled aggregate, recycled cementitious material, etc., which all cause internal water shortage of the 3D printed concrete material, are not favorable for the durability of concrete, and especially the 3D printed concrete has large drying shrinkage and is easy to crack.
Disclosure of Invention
The invention aims to: the invention aims to provide a method for preparing 3D printing concrete, which solves the problems of water shortage and poor maintenance in the 3D printing concrete on one hand; on the other hand, the problem that the bonding strength between the 3D printing concrete layers is low is solved.
The technical scheme is as follows: the method for preparing the 3D printing concrete comprises the following steps:
step 1, printing a 3D printed concrete outline, and then placing a pre-bound reinforcing steel bar in the middle of the 3D printed concrete outline, wherein 10% -30% of the reinforcing steel bar is replaced by a porous steel pipe;
step 2, pouring lightweight fine aggregate self-leveling concrete in the middle of the 3D printed concrete outline;
step 3, placing the 3D printed concrete sample in a closed curing room for CO 2 Maintaining;
step 4, carrying out wet maintenance on the surface of the 3D printed concrete for 1-7 days, injecting water into the steel pipe for maintenance for 1-14 days, wherein the injected water is a saturated lime water solution, discharging the saturated lime water solution from the steel pipe after the maintenance is finished, and injecting expandable foam concrete;
and 5, spraying a mixed solution of gamma-type nano aluminum oxide and sodium silicate on the outer surface of the 3D printed concrete profile, wherein the ratio of the gamma-type nano aluminum oxide to the sodium silicate is 1: 1-1: 3, and the mass concentration of the solution is 30-50%.
Further, in the step 1, the pipe diameter of the porous steel pipe is 10-16-mm, and the aperture of a hole in the porous steel pipe is 0.5-1 mm.
Further, in step 1, the connection between the porous steel pipes is a flange or a threaded connection.
Further, in the step 2, porous fiber pipes are doped in the light fine aggregate self-leveling concrete and the 3D printing concrete, and the doping amount of the fiber pipes is 0.5-2kg/m 3 。
Furthermore, the pipe diameter of the fiber pipe is 0.1-1mm, the hole diameter on the fiber pipe is 0.005-0.01mm, and the length of the fiber pipe is 1-2 cm.
Furthermore, the aggregate for the light fine aggregate self-leveling concrete is one or more of recycled aggregate, zeolite, ceramsite, wood chips and the like, the particle size of the aggregate is less than 5mm, and the aggregate does not need to be pre-wetted in advance.
Further, in step 3, CO in the curing room is controlled 2 The concentration is 40-80%, the humidity is 50-60%, the temperature is 20-50 ℃, and the curing time is 7-24 h.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages:
(1) according to the invention, the reinforcing steel bars and the porous steel pipes are arranged in the 3D printed concrete, so that the integrity of the 3D printed concrete can be improved, in addition, water in the porous steel pipes can be used for supplementing water inside the 3D printed concrete, and then the water is transmitted through the fiber pipes, so that the effect of transferring water inside the 3D printed concrete can be achieved, the self-drying inside the concrete is reduced, and the problem of water shortage inside the 3D printed concrete is solved. In addition, the use of the fiber pipe also improves the crack resistance of the 3D printed concrete.
(2) The interlayer bonding force of the outer 3D printed concrete is enhanced by pouring the light fine aggregate self-leveling concrete into the 3D printed concrete outline, and meanwhile, the fine aggregate self-leveling concrete can flow into the holes in the steel pipe, so that the bonding force between the concrete and the steel pipe is increased; in addition, the light fine aggregate self-leveling concrete can provide heat insulation performance for 3D printing concrete. The lightweight fine aggregate concrete can accelerate the condensation without prewetting, when the porous steel pipe is used for replenishing water to the concrete, the lightweight aggregate can be used as a water storage device for storing water in the concrete, and when the interior of the concrete is lack of water, the lightweight fine aggregate concrete can be used for replenishing water to the interior of the concrete.
(3) The 3D printing concrete is formed by bonding a multilayer structure, has a large specific surface area, is provided with the porous steel pipe and the porous fiber pipe, can transmit CO2 to each position of the 3D concrete by curing with CO2, and has the advantages that the CO2 reacts with the surface of the concrete and the calcium hydroxide inside the concrete, the compactness and the strength of the concrete are improved, and the CO2 is utilized.
(4) The saturated lime water solution is poured into the porous steel pipe, water can be supplemented for the 3D printed concrete, calcium hydroxide can also be supplemented for the 3D concrete, and because the 3D printed concrete contains more mineral admixture, the supplement of the saturated lime water solution can improve the alkalinity of the whole 3D printed concrete on one hand, accelerate the reaction of the mineral admixture on the other hand, and improve the strength of the 3D concrete.
(5) The gamma-type nano aluminum oxide and sodium silicate solution are sprayed on the surface of the 3D concrete, the aim is to further fill and seal holes on the surface of the concrete, and the sodium silicate solution and the nano aluminum oxide can react with saturated lime water solution and calcium carbonate formed on the surface of the concrete due to carbonization curing to form calcium silicate gel, hydrated aluminum silicate and hydrated aluminum carbonate to fill the holes on the surface of the 3D printed concrete, so that water exchange between the 3D printed concrete and the outside is reduced, and drying shrinkage is reduced.
Detailed Description
The technical solution of the present invention is further explained below.
The invention is realized by the following technical scheme: a method of preparing 3D printed concrete comprising the steps of:
(1) printing a 3D printed concrete outline, then placing a steel bar bound in advance in the middle of the 3D printed concrete outline, wherein 10% -30% of the steel bar is replaced by a porous steel pipe, the diameter of the steel pipe is 10-16mm, the aperture of a hole in the steel pipe is 0.5-1mm, and the porous steel pipes are connected by flanges or threads;
(2) and pouring light fine aggregate self-leveling concrete in the middle of the 3D printed concrete outline.
(3) Placing the 3D printed concrete sample in a closed curing room for CO 2 Curing and controlling CO in curing chamber 2 The concentration is 40-80%, the humidity is 50-60%, the temperature is 20-50 ℃, and the curing time is 7-24 h;
(4) carrying out wet maintenance on the surface of the 3D printed concrete for 1-7D, injecting water into the steel pipe for maintenance for 1-14D, wherein the water is saturated lime water solution, discharging the saturated lime water solution from the steel pipe after the maintenance is finished, and injecting expandable foam concrete;
(5) spraying a mixed solution of gamma-type nano aluminum oxide and sodium silicate on the outer surface of the 3D printed concrete profile, wherein the ratio of the gamma-type nano aluminum oxide to the sodium silicate is 1: 1-1: 3, and the mass concentration of the solution is 30-50%;
porous fiber pipes are doped in the lightweight fine aggregate self-leveling concrete and the 3D printing concrete, and the doping amount of the fiber pipes is 0.5-2kg/m 3 The pipe diameter of the fiber pipe is less than 0.1-1mm, the hole diameter on the fiber pipe is 0.005-0.01mm, and the length of the fiber pipe is 1-2 cm.
The aggregate for the light fine aggregate self-leveling concrete is one or more of recycled aggregate, zeolite, ceramsite, wood chips and the like, the particle size of the aggregate is less than 5mm, and the aggregate does not need to be pre-wetted in advance.
In addition:
the mix proportion of the 3D printing concrete of all the embodiments is as follows: 300kg of PII 52.5 cement, 100kg of sulphoaluminate cement, 100kg of attapulgite, 709kg of sand, 1100kg of stone, 160kg of water, 5kg of water reducing agent, 3kg of polyacrylamide and 1kg of porous PVA fiber pipe.
The lightweight fine aggregate self-leveling concrete of all examples: 42.5 kg of sulphoaluminate cement, 180kg of mineral powder, 800kg of light aggregate, 180kg of water, 10kg of active magnesium oxide, 1kg of porous PVA fiber pipe and 6kg of water reducing agent.
Example one
A method of preparing 3D printed concrete comprising the steps of:
(1) printing a 3D printed concrete outline, then placing pre-bound steel bars in the middle of the 3D printed concrete outline, wherein 30% of the steel bars are replaced by porous steel pipes, the diameter of the steel pipes is 16mm, the pore diameter of holes in the steel pipes is smaller than 1mm, and the porous steel pipes are connected by flanges or threads;
(2) and pouring light fine aggregate self-leveling concrete among the 3D printed concrete outlines.
(3) Placing the 3D concrete sample in a closed curing room for CO 2 Curing and controlling CO in curing chamber 2 The concentration is 80%, the humidity is 60%, the temperature is 50 ℃, and the curing time is 24 hours;
(4) carrying out wet maintenance on the surface of the 3D concrete for 7D, and carrying out water injection maintenance on the steel pipe for 14D, wherein the water injection is a saturated lime water solution, discharging the saturated lime water solution in the steel pipe after the maintenance is finished, and injecting the large-expansion foam concrete, wherein the water-cement ratio is 0.5;
(5) spraying a mixed solution of gamma-type nano aluminum oxide and sodium silicate on the outer surface of the 3D printed concrete profile, wherein the ratio of the gamma-type nano aluminum oxide to the sodium silicate is 1:3, and the mass concentration of the solution is 50%;
porous fiber pipes are doped in the light fine aggregate self-leveling concrete and the 3D printing concrete, the pipe diameter of each fiber pipe is 1mm, the pore diameter of each fiber pipe is 0.01mm, and the length of each fiber pipe is 2 cm.
The aggregate for the light fine aggregate self-leveling concrete is ceramsite, the particle size of the aggregate is less than 5mm, and the aggregate does not need to be pre-wetted in advance.
Example two
A method of preparing 3D printed concrete comprising the steps of:
(1) printing a 3D printed concrete outline, then placing pre-bound steel bars in the middle of the 3D printed concrete outline, wherein 10% of the steel bars are replaced by porous steel pipes, the diameter of each steel pipe is 12mm, the pore diameter of each hole in each steel pipe is smaller than 1mm, and the porous steel pipes are connected by flanges or threads;
(2) and pouring light fine aggregate self-leveling concrete among the 3D printed concrete outlines.
(3) Placing the 3D concrete sample in a closed curing room for CO 2 Curing and controlling CO in curing chamber 2 The concentration is 40%, the humidity is 50%, the temperature is 20 ℃, and the curing time is 7 h;
(4) carrying out wet maintenance on the surface of the 3D concrete for 1D, injecting water into the steel pipe for maintenance for 1D, wherein the injected water is a saturated lime water solution, discharging the saturated lime water solution from the steel pipe after the maintenance is finished, and injecting expandable foam concrete, wherein the water-cement ratio is 0.6;
(5) spraying a mixed solution of gamma-type nano aluminum oxide and sodium silicate on the outer surface of the 3D printed concrete profile, wherein the ratio of the gamma-type nano aluminum oxide to the sodium silicate is 1:1, and the mass concentration of the solution is 30%;
porous fiber tubes are doped in the lightweight fine aggregate self-leveling concrete and the 3D printing concrete, the tube diameter of each fiber tube is 0.1mm, the pore diameter of each fiber tube is 0.005mm, and the length of each fiber tube is 1 cm.
The aggregate for the lightweight fine aggregate self-leveling concrete is recycled aggregate, the particle size of the aggregate is less than 5mm, and the aggregate does not need to be pre-wetted in advance.
EXAMPLE III
A method of preparing 3D printed concrete comprising the steps of:
(1) printing a 3D printed concrete outline, then placing a steel bar which is bound in advance in the middle of the 3D printed concrete outline, wherein 20% of the steel bar is replaced by a porous steel pipe, the diameter of the steel pipe is 16mm, the aperture of a hole in the steel pipe is smaller than 1mm, and the porous steel pipes are connected by flanges or threads;
(2) and pouring light fine aggregate self-leveling concrete among the 3D printed concrete outlines.
(3) Placing the 3D concrete sample in a closed curing room for CO 2 Curing and controlling CO in curing chamber 2 The concentration is 50%, the humidity is 55%, the temperature is 30 ℃, and the curing time is 12 h;
(4) carrying out wet maintenance on the surface of the 3D concrete for 7D, and carrying out water injection maintenance on the steel pipe for 14D, wherein the water injection is saturated lime water solution, discharging the saturated lime water solution in the steel pipe after the maintenance is finished, and injecting high-water-cement-ratio expandable foam concrete, wherein the water-cement ratio is 0.6;
(5) spraying a mixed solution of gamma-type nano aluminum oxide and sodium silicate on the outer surface of the 3D printed concrete profile, wherein the ratio of the gamma-type nano aluminum oxide to the sodium silicate is 1:2, and the mass concentration of the solution is 40%;
porous fiber tubes are doped in the light fine aggregate self-leveling concrete and the 3D printing concrete, the tube diameter of each fiber tube is 0.5mm, the hole diameter on each fiber tube is 0.008mm, and the length of each fiber tube is 1.5 cm.
The aggregate for the light fine aggregate self-leveling concrete is zeolite, the particle size of the aggregate is less than 5mm, and the aggregate does not need to be pre-wetted in advance.
Example four
A method of preparing 3D printed concrete comprising the steps of:
(1) printing a 3D printed concrete outline, then placing pre-bound reinforcing steel bars in the middle of the 3D printed concrete outline, wherein 30% of the reinforcing steel bars are replaced by porous steel pipes, the diameter of each steel pipe is 10mm, the pore diameter of each hole in each steel pipe is smaller than 1mm, and the porous steel pipes are connected by flanges or threads;
(2) and pouring light fine aggregate self-leveling concrete among the 3D printed concrete outlines.
(3) Placing the 3D concrete sample in a closed curing room for CO 2 Curing and controlling CO in the curing chamber 2 The concentration is 50%, the humidity is 55%, the temperature is 30 ℃, and the curing time is 12 h;
(4) carrying out wet maintenance on the surface of the 3D concrete for 7D, and carrying out water injection maintenance on the steel pipe for 14D, wherein the water injection is saturated lime water solution, discharging the saturated lime water solution in the steel pipe after the maintenance is finished, and injecting high-water-cement-ratio expandable foam concrete, wherein the water-cement ratio is 0.6;
(5) spraying a mixed solution of gamma-type nano aluminum oxide and sodium silicate on the outer surface of the 3D printed concrete outline, wherein the ratio of the gamma-type nano aluminum oxide to the sodium silicate is 1:2, and the mass concentration of the solution is 40%;
porous fiber pipes are doped in the light fine aggregate self-leveling concrete and the 3D printing concrete, the pipe diameter of each fiber pipe is 1mm, the pore diameter of each fiber pipe is 0.01mm, and the length of each fiber pipe is 1 cm.
The aggregate for the light fine aggregate self-leveling concrete is wood chips, the particle size of the aggregate is less than 5mm, and the aggregate does not need to be pre-wetted in advance.
Comparative example
300kg of PII 52.5 cement, 100kg of sulphoaluminate cement, 100kg of attapulgite, 710kg of sand, 1100kg of stone, 160kg of water, 5kg of water reducing agent and 3kg of polyacrylamide.
The performance assessment indexes are shown in table 1, the compression strength, the 28D concrete interlayer bonding strength (tested after being cut into a non-reinforced sample with a standard size) and the drying shrinkage test are respectively carried out on the concrete prepared in the examples 1 to 4 and the concrete prepared in the comparative example 1, the test methods refer to GB/T50080-2016 standard method for testing the performance of common concrete mixtures, GB 50081-2002-standard method for testing the mechanical performance of common concrete and patent 201911206075.4 for testing the bonding strength between 3D printed concrete layers, the heat conductivity is carried out according to the provisions of GB/T10294-2008-method for measuring the steady-state thermal resistance and the related characteristics of the thermal insulation material and the protection hot plate method, and the test results are shown in table 1.
TABLE 1
As can be seen from Table 1, the 28d compressive strength and bond strength of the examples are also significantly higher than those of the comparative examples, and at the same time, the drying shrinkage properties are lower and the thermal conductivity is lower.
Claims (7)
1. A method for preparing 3D printing concrete is characterized by comprising the following steps:
step 1, printing a 3D printed concrete outline, and then placing a pre-bound reinforcing steel bar in the middle of the 3D printed concrete outline, wherein 10% -30% of the reinforcing steel bar is replaced by a porous steel pipe;
step 2, pouring lightweight fine aggregate self-leveling concrete in the middle of the 3D printed concrete outline;
step 3, placing the 3D printed concrete sample in a closed curing room for CO 2 Maintaining;
step 4, carrying out wet maintenance on the surface of the 3D printed concrete for 1-7 days, injecting water into the steel pipe for maintenance for 1-14 days, wherein the injected water is a saturated lime water solution, discharging the saturated lime water solution from the steel pipe after the maintenance is finished, and injecting expandable foam concrete;
step 5, spraying a mixed solution of gamma-type nano aluminum oxide and sodium silicate on the outer surface of the 3D printed concrete outline, wherein the ratio of the gamma-type nano aluminum oxide to the sodium silicate is 1: 1-1: 3, and the mass concentration of the solution is 30-50%;
in the step 2, porous fiber pipes are doped in the light fine aggregate self-leveling concrete and the 3D printing concrete.
2. The method for preparing 3D printed concrete according to claim 1, wherein in the step 1, the pipe diameter of the porous steel pipe is 10-16mm, and the pore diameter of the pores in the porous steel pipe is 0.5-1 mm.
3. The method for preparing 3D printed concrete according to claim 1 or 2, wherein in the step 1, the connection between the porous steel pipes is a flange or a threaded connection.
4. The method for preparing 3D printed concrete according to claim 1, wherein the mixing amount of the fiber pipes is 0.5-2kg/m 3 。
5. The method for preparing 3D printed concrete according to claim 4, wherein the diameter of the fiber tube is 0.1-1mm, the diameter of the hole on the fiber tube is 0.005-0.01mm, and the length of the fiber tube is 1-2 cm.
6. The method for preparing 3D printed concrete according to claim 1, wherein the aggregate for the lightweight fine aggregate self-leveling concrete is one or more of recycled aggregate, zeolite, ceramsite and wood chips, and the particle size of the aggregate is less than 5 mm.
7. The method for preparing 3D printed concrete according to claim 1, wherein in step 3, CO in a curing room is controlled 2 The concentration is 40-80%, the humidity is 50-60%, the temperature is 20-50 ℃, and the curing time is 7-24 h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210172740.8A CN114656225B (en) | 2022-02-24 | 2022-02-24 | Method for preparing 3D printing concrete |
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| CN115849814A (en) * | 2022-12-02 | 2023-03-28 | 天津市新天钢联合特钢有限公司 | 3D printing base material prepared from metallurgical slag and preparation method thereof |
| CN115947585B (en) * | 2023-02-13 | 2023-11-21 | 南京工业大学 | Copper-nickel slag 3d printing baking-free carbonized ceramic particle and preparation method thereof |
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