CN115466084B - High-specific-strength light EPS heat-insulation concrete material for 3D printing and preparation method thereof - Google Patents

High-specific-strength light EPS heat-insulation concrete material for 3D printing and preparation method thereof Download PDF

Info

Publication number
CN115466084B
CN115466084B CN202210959920.0A CN202210959920A CN115466084B CN 115466084 B CN115466084 B CN 115466084B CN 202210959920 A CN202210959920 A CN 202210959920A CN 115466084 B CN115466084 B CN 115466084B
Authority
CN
China
Prior art keywords
eps
strength
concrete
mixing
stirring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202210959920.0A
Other languages
Chinese (zh)
Other versions
CN115466084A (en
Inventor
于清亮
王子潇
王紫璇
张厚登
陈乾
吴庆尉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wuhan University WHU
Original Assignee
Wuhan University WHU
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wuhan University WHU filed Critical Wuhan University WHU
Priority to CN202210959920.0A priority Critical patent/CN115466084B/en
Publication of CN115466084A publication Critical patent/CN115466084A/en
Application granted granted Critical
Publication of CN115466084B publication Critical patent/CN115466084B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • 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
    • 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
    • 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
    • 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
    • C04B2111/40—Porous or lightweight materials
    • 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
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
    • 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
    • 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
    • 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
    • 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

Abstract

The invention discloses a high-specific-strength light EPS (expandable polystyrene) heat-insulating concrete material for 3D printing and a preparation method thereof, wherein the concrete material comprises the following components: a cementitious material; water; an early strength functional agent; a water reducing agent; polystyrene (EPS) particles; mixing the organic fiber. During preparation, the macroscopic organic fiber is mixed with the cementing material and the quartz sand to obtain a mixed material; uniformly mixing the nano-fibers, the water reducing agent and the mixing water to obtain a suspension for mixing; and mixing the mixed material and the suspension for stirring under stirring to obtain slurry, thus obtaining the high-specific-strength light EPS heat-insulating concrete material for 3D printing. The invention effectively improves the compression strength, the breaking strength and the specific strength of the EPS lightweight concrete, and can improve the dry shrinkage resistance of the EPS concrete. The high-specific-strength EPS lightweight concrete material provided by the invention also has good rheological property, and can be used for 3D printing rapid forming.

Description

High-specific-strength light EPS heat-insulation concrete material for 3D printing and preparation method thereof
Technical Field
The invention belongs to the technical field of materials, relates to a concrete material, and particularly relates to a high-specific-strength light EPS (expandable polystyrene) heat-insulating concrete material for 3D printing and a preparation method thereof.
Background
2021 research report on energy consumption and carbon emission of Chinese buildings: the provincial building carbon peak shape evaluation report shows that the total energy consumption of the whole process of the national building in 2019 is 22.33 hundred million tons of standard coal, wherein the energy consumption of the building in the operation stage is 10.3 hundred million tons of standard coal, and accounts for 21.2 percent of the total energy consumption of the national building. The total carbon emission amount of the whole process of buildings in the whole country in 2019 is 49.97 million tons of carbon dioxide, wherein the carbon emission of the buildings in the operation stage is 21.30 million tons of carbon dioxide, and the carbon emission accounts for 21.6 percent of the carbon emission in the whole country. In the carbon emission of building operation, the direct carbon emission of the building accounts for about 26%, the electric carbon emission accounts for 53%, and the thermal carbon emission accounts for 21%. After 2017, the direct carbon emission of the building is in a descending trend, the electric carbon emission of the building is still maintained at 8% acceleration, and the thermal carbon emission is accelerated by about 3%. Therefore, the electric power, thermal power energy consumption and carbon emission for keeping indoor comfortable temperature in the building operation stage are reduced, and the energy consumption and carbon emission in the whole building process can be effectively reduced. The concrete material with good heat preservation and insulation performance is used for the outer wall of the building, so that the heat preservation and insulation performance of the building can be effectively improved, and the energy consumption and carbon emission in the operation stage of the building are reduced. The EPS particles are introduced into the cement-based material, so that the performances of light heat preservation, sound insulation, noise reduction, shock resistance, energy absorption and the like of concrete can be improved, and the fireproof and high temperature resistance of the EPS particles can also be improved.
However, the EPS particles float upward easily in the mixing and pouring process of EPS concrete and the particles are unevenly distributed in the hardened concrete due to overlarge density difference between the EPS light aggregate and cement paste. In the prior art, surface modification is mostly carried out on EPS particles to reduce the floating phenomenon of the EPS particles, for example, patent CN114315412A discloses modified EPS particles and a modification method thereof, concrete containing the modified EPS particles and a preparation method thereof, wherein the patent discloses that an adhesive material is sprayed on the surface of the EPS particles to obtain EPS particles with the surface adhered with the adhesive material, and then the EPS particles are used for the concrete, and the adhesive material comprises polyvinyl alcohol, epoxy resin, a silane coupling agent and water; for example, patent CN110713391A discloses a light cement insulation board for energy-saving buildings and a preparation method thereof, which disclose that EPS foamed particles are firstly treated by a coupling agent, then soaked with a calcium hydroxide saturated solution, and then introduced with a carbonate solution to obtain calcium carbonate coated modified EPS foamed particles; however, these pretreatment methods not only increase the preparation cost of concrete, but also make the pretreatment process more complicated, which is not conducive to the development of site construction.
In addition, the EPS concrete generally has the bottleneck technical problems that the low apparent density, the high strength, the low heat conductivity coefficient and the high strength cannot be compatible and the like. The EPS particle size and the mixing amount can influence the apparent density, the thermal performance and the mechanical performance of EPS concrete. As the mixing amount of the EPS particles is increased, the heat conductivity coefficient of the EPS concrete is reduced, but the compressive strength of the EPS concrete is obviously reduced, and the drying shrinkage is larger. For the research of high specific strength EPS concrete, the common method is to reduce the water-to-gel ratio of the slurry (generally lower than 0.3), and use mineral admixture to assist the cementing material, so as to improve the compressive strength of the hardened slurry. However, the lower water-cement ratio increases the density of the hardened slurry body and improves the heat conductivity coefficient, thereby reducing the heat insulation performance of the EPS concrete; in addition, the use amount of cementing materials such as cement is increased by adopting a lower water-cement ratio, so that the cost of the EPS concrete is increased, and the carbon emission is increased.
Aiming at the phenomenon of larger shrinkage of EPS light concrete, at present, the macro organic fibers are selected to be used for inhibiting the shrinkage deformation of the EPS concrete, but the dosage of the macro organic fibers is larger, for example, the volume mixing amount of the macro organic fibers accounts for more than 5% of the volume of the concrete. The cost of the EPS concrete can be improved to a certain extent, and the mechanical properties of the EPS concrete after high temperature can be greatly reduced due to the lower melting point of macroscopic organic fibers, poorer high temperature resistance and excessive mixing amount; if the high-temperature resistant macroscopic organic fiber is used, the cost of the EPS concrete is further increased.
The 3D printing construction technology of the concrete can effectively reduce energy consumption and carbon emission in the construction stage. In the current research on 3D printing construction of lightweight concrete, the technical problem is that compared with ordinary concrete, firstly, the lightweight concrete has a large drying shrinkage, which seriously affects the volume stability of the printed and formed concrete. In addition, there is still a conflict between the flowability, setting time and printability of lightweight concrete, i.e. an optimum balance between early strength, flowability, setting time and printable time window is required.
Therefore, the preparation method with low cost and simple process is adopted, and on the basis of solving the problem of upward floating of EPS particles, the light weight, high strength, low heat conductivity coefficient and low drying shrinkage performance of the EPS concrete are realized, so that the preparation method is an effective way for solving the technical problem of the EPS concrete capable of being printed in a 3D mode.
Disclosure of Invention
Aiming at the technical problem of the existing EPS concrete, the invention provides a high-specific-strength light EPS heat-insulating concrete material for 3D printing and a preparation method thereof, and the prepared EPS concrete has high specific strength, high heat-insulating performance and dry shrinkage resistance. In addition, the EPS concrete provided by the invention has the advantages of simple construction mode and low cost, can realize uniform distribution of EPS particles in concrete without processing the EPS particles, has good rheological property, and can be suitable for a 3D printing construction mode.
In order to achieve the above purpose, the invention provides the following technical scheme:
the utility model provides a high than strong light EPS heat preservation concrete material for 3D prints which characterized in that: the paint comprises the following components in parts by mass: 100 parts of a cementing material; 20-30 parts of quartz sand; 30-45 parts of water; a water reducing agent; polystyrene foam particles; a nanofiber; macroscopic organic fibers.
As a preferable scheme, the early strength functional agent is 10-20 parts of quick-hardening cement serving as a cementing material component, the early strength of the material can be improved by adding the early strength functional agent, so that the printing speed is improved, the quick-hardening cement has two functions of a cementing material and the early strength agent, and at the moment, the cementing material is formed by compounding ordinary portland cement and the quick-hardening cement.
Further preferably, the initial setting time of the rapid hardening cement is less than 45s.
Preferably, the particle size of the quartz sand is in the range of 100 to 1000 microns.
As a preferable scheme, the particle size of the EPS particles is 1-5 mm of continuous gradation, and the EPS particles account for 62-74% of the volume of the slurry.
As a preferable scheme, the macroscopic organic fiber accounts for 0.01-0.05% of the volume of the slurry;
preferably, the macroscopic organic fiber has a length of 12 to 16 mm, a diameter of 18 to 40 micrometers, and a Young's modulus of 42GPa or more.
As a preferable scheme, the nanofiber is plant-based nanocellulose aqueous dispersion, wherein the solid content of the nanofiber is 1.5-3.0%; the mass of the nano fiber is 1.0-3.0% of the mass of the cementing material.
As a preferred scheme, the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent, and the water reducing rate is more than 30 percent; the water reducing agent accounts for 0.5-2.0% of the mass of the cementing material.
The invention also provides a preparation method of the high-specific-strength light EPS heat-insulation concrete material for 3D printing, which is characterized by comprising the following steps:
(1) Mixing macroscopic organic fibers with a powder cementing material, an early strength functional agent and quartz sand, and dry-mixing until the fibers are uniformly dispersed in the cementing material and the quartz sand powder to obtain a mixed material;
(2) Uniformly mixing the nano-fibers, the coagulant, the water reducing agent and the mixing water, and stirring until a uniformly mixed suspension for mixing is obtained; the mixture is mixed in the mixed material in the step (1);
(3) Slowly pouring the mixed liquid obtained in the step (2) into the mixed material obtained in the step (1) by stirring the suspension liquid for stirring, stirring at a low speed for 30-60 s in a stirring pot, and then stirring at a high speed for 120-180 s to obtain uniform slurry;
(4) Pouring the polystyrene foam particles into the slurry at a constant speed, stirring at a low speed for 60-120 s, and then stirring at a high speed for 10-30 s to obtain uniformly mixed slurry; and obtaining the high-specific-strength light EPS heat-insulation concrete material for 3D printing.
Aiming at the phenomenon that EPS lightweight aggregate floats upwards and is greatly shrunk in cement paste, the invention adjusts the consistency and the fluidity of the cement paste by using the micro-nano scale and macro scale mixed organic fiber, improves the interface transition region between EPS particles and the cement paste, and realizes the uniform distribution of EPS particles with different sizes in hardened paste. Meanwhile, the mixed fiber with lower mixing amount is doped, so that the drying shrinkage of the EPS concrete in the 28-day age can be effectively reduced.
Aiming at the technical problem that the EPS concrete is difficult to take into account of low density, high strength, low heat conductivity coefficient and high strength, the invention designs the mixing ratio of the EPS concrete by adopting a particle continuous accumulation theoretical model, realizes the closest accumulation of solid powder particles and EPS particles with different particle sizes, and realizes the high specific strength of the EPS concrete.
Compared with the prior art, the technical method and the product provided by the invention have the following beneficial effects:
(1) The EPS concrete prepared by the invention reasonably designs the particle grading of EPS particles by a theoretical calculation method of closest packing, effectively improves the flexural strength of the EPS concrete by doping a very small amount of macroscopic organic fibers, and obtains the EPS concrete material with high specific strength. Can effectively solve the problems of low strength, low specific strength and other mechanical properties of EPS concrete products.
(2) The EPS concrete material prepared by the invention has proper fluidity, better rheological property, good extrudability and constructability, and can be suitable for 3D printing rapid forming.
(3) The EPS heat-insulation concrete prepared by the invention achieves the purposes of light weight, high specific strength, excellent heat-insulation performance and non-flammability through the optimization of the mix proportion design. The raw materials involved in the invention are easy to obtain, the process is simple, and the effect is obvious. The EPS concrete prepared by the invention can be used for heat preservation of external walls, building enclosure structures, roofs and the like, and can effectively improve the heat preservation and insulation effects of buildings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention belong to the protection scope of the present invention.
Example 1:
the embodiment provides a high-specific-strength light EPS heat-insulating concrete material for 3D printing, which considers that Portland cement and rapid-hardening cement are compounded to serve as a cementing material, wherein the rapid-hardening cement serves as an early-strength functional agent, quartz sand and continuous-graded EPS particles serve as aggregate together, and nano fibers and macroscopic organic fibers serve as doped fibers together to prepare the EPS concrete material, and the specific mixture ratio is as follows:
Figure GDA0004071644960000041
(1) Uniformly mixing macroscopic organic fibers with Portland cement, quick-hardening cement and quartz sand according to the corresponding component proportion to obtain a mixed material;
(2) Mixing the water reducing agent, the nano-fibers and water according to the corresponding component proportion to obtain a uniformly mixed suspension for stirring;
(3) And pre-stirring the obtained mixed material in a stirring pot, adding the suspension for stirring at a constant speed, fully stirring, and finally adding the EPS particles into the mixed material at a constant speed and stirring to obtain the required high-specific-strength light EPS heat-insulating concrete material.
Example 2:
the embodiment provides a high-specific-strength light EPS heat-insulating concrete material for 3D printing, which considers that Portland cement and rapid-hardening cement are compounded to serve as a cementing material, wherein the rapid-hardening cement serves as an early-strength functional agent, quartz sand and continuous-graded EPS particles serve as aggregate together, and nano fibers and macroscopic organic fibers serve as doped fibers together to prepare the EPS concrete material, and the specific mixture ratio is as follows:
Figure GDA0004071644960000051
(1) Uniformly mixing the macroscopic organic fibers with the Portland cement, the rapid-hardening cement and the quartz sand according to the corresponding component proportion to obtain a mixed material;
(2) Mixing the water reducing agent, the nano-fibers and water according to the corresponding component proportion to obtain a uniformly mixed suspension for stirring;
(3) And (3) pre-stirring the obtained mixed material in a stirring pot, adding the suspension for stirring at a constant speed, fully stirring, and finally adding the EPS particles into the mixed material at a constant speed and stirring to obtain the required high-specific-strength light EPS heat-insulating concrete material.
Example 3:
the embodiment provides a high-specific-strength light EPS (expandable polystyrene) heat-insulating concrete material for 3D printing, which considers that Portland cement and rapid-hardening cement are compounded to serve as a cementing material, wherein the rapid-hardening cement serves as an early-strength functional agent, quartz sand and continuous-graded EPS (expandable polystyrene) particles serve as aggregate, and nano fibers and macroscopic organic fibers serve as doped fibers to prepare the EPS concrete material, and the concrete mixture ratio is as follows:
Figure GDA0004071644960000052
Figure GDA0004071644960000061
(1) Uniformly mixing macroscopic organic fibers with Portland cement, quick-hardening cement and quartz sand according to the corresponding component proportion to obtain a mixed material;
(2) Mixing the water reducing agent, the nano-fibers and water according to the corresponding component proportion to obtain a uniformly mixed suspension for stirring;
(3) And pre-stirring the obtained mixed material in a stirring pot, adding the suspension for stirring at a constant speed, fully stirring, and finally adding the EPS particles into the mixed material at a constant speed and stirring to obtain the required high-specific-strength light EPS heat-insulating concrete material.
Example 4:
the embodiment provides a high-specific-strength light EPS heat-insulating concrete material for 3D printing, which considers that Portland cement and rapid-hardening cement are compounded to serve as a cementing material, wherein the rapid-hardening cement serves as an early-strength functional agent, quartz sand and continuous-graded EPS particles serve as aggregate together, and nano fibers and macroscopic organic fibers serve as doped fibers together to prepare the EPS concrete material, and the specific mixture ratio is as follows:
Figure GDA0004071644960000062
(1) Uniformly mixing macroscopic organic fibers with Portland cement, quick-hardening cement and quartz sand according to the corresponding component proportion to obtain a mixed material;
(2) Mixing the water reducing agent, the nano-fibers and water according to the corresponding component proportion to obtain a uniformly mixed suspension for stirring;
(3) And pre-stirring the obtained mixed material in a stirring pot, adding the suspension for stirring at a constant speed, fully stirring, and finally adding the EPS particles into the mixed material at a constant speed and stirring to obtain the required high-specific-strength light EPS heat-insulating concrete material.
Comparative example 1:
the comparison example provides a light-weight heat-preservation high-specific-strength EPS concrete material, and considers that only portland cement is taken as a cementing material, quartz sand and EPS particles in continuous gradation are taken as aggregate together, an early-strength functional agent and macroscopic organic fibers are not added, and only nano fibers are added to prepare the EPS concrete material, wherein the specific mixture ratio is as follows:
Figure GDA0004071644960000071
(1) Uniformly mixing the portland cement and the quartz sand according to the corresponding component proportion to obtain a mixed material;
(2) Mixing the water reducing agent, the nano-fibers and water according to the corresponding component proportion to obtain a uniformly mixed suspension for stirring;
(3) And pre-stirring the obtained mixed material in a stirring pot, adding the suspension for stirring at a constant speed, fully stirring, and finally adding the EPS particles into the mixed material at a constant speed and stirring to obtain the required high-specific-strength light EPS heat-insulating concrete material.
The results of the molding property tests of examples 1 to 4 of the present invention and comparative example 1 are shown in Table 1.
The flexural strength and the compressive strength of the invention are measured according to the method for testing the strength of cement mortar (ISO method) (GB/T17671-2021). The dry apparent density and the saturated water absorption rate were measured according to technical standards for lightweight aggregate concrete application (JGJ/T12-2019). The heat conductivity coefficient is measured by a portable heat conduction instrument, and the heat conductivity coefficient of each group can be obtained by averaging the three test blocks of each group. The fluidity, consistency and drying shrinkage were measured according to the Cement mortar Dry shrinkage test method (JC/T603-2004).
TABLE 1 physical and mechanical Properties of groups of EPS concrete
Figure GDA0004071644960000072
As can be seen from Table 1, the strength and specific strength values of the EPS concrete in the four examples are higher than those in the comparative example 1, and the saturated water absorption and thermal conductivity values of the EPS concrete in the four examples are lower than those in the comparative example 1, as compared with those in the comparative example 1. In the four groups of embodiments, the EPS concrete has high specific strength, the specific strength of flexural strength-apparent density is 4000-4600 N.m/kg, and the specific strength of compressive strength-apparent density is 9000-10000 N.m/kg. The method shows that the addition of the rapid hardening cement can adjust the setting time of the EPS concrete and promote the early strength development of the EPS concrete; meanwhile, after the macro organic fibers are doped, the macro organic fibers effectively inhibit the generation and development of cracks of the EPS concrete within a certain doping amount range, the pore structure of the EPS concrete is improved, and the pore diameter of the microstructure is refined, so that the heat conductivity coefficient of the EPS concrete is obviously reduced, and the specific strength value is improved.
TABLE 2 Dry shrinkage of EPS concrete of each group
Figure GDA0004071644960000081
As can be seen from table 2, the four groups of examples exhibited excellent performance of suppressing the drying shrinkage of EPS concrete as compared with comparative example 1, and particularly, the effect of suppressing the drying shrinkage was significant in the later stage after 14 days of age. Among them, the EPS concretes of example 2, example 3, and example 4 had much lower dry shrinkage at 28-day age than comparative example 1.
TABLE 3 rheological Properties of the EPS concrete materials of each group
Group of Dynamic yield stress (Pa) Plastic viscosity (Pa.s)
Example 1 29.70 2.57
Example 2 40.10 3.00
Example 3 37.25 2.67
Example 4 48.03 1.85
Comparative example 1 90.31 2.39
As can be seen from table 3, the low content of the hybrid organic fibers in examples 1, 2 and 3 can greatly reduce the dynamic yield stress and increase the plastic viscosity of the EPS concrete material compared to comparative example 1. In example 3, the plastic viscosity of the EPS concrete material was reduced with increasing the amount of the hybrid organic fiber added, compared to comparative example 1. The concrete material has low dynamic yield stress and proper plastic viscosity, and the concrete material has good rheological property, so that the concrete material is favorably pumped and extruded smoothly, and the concrete material has good printability.
The above embodiments are merely illustrative of the present invention and are not to be construed as limiting the invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications or equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and the technical solution of the present invention is covered by the claims of the present invention.

Claims (5)

1. The utility model provides a high than strong light EPS heat preservation concrete material for 3D prints which characterized in that: the paint comprises the following components in parts by mass: 100 parts of a cementing material; 20-30 parts of quartz sand; an early strength functional agent; 30 to 45 parts of water; a water reducing agent; polystyrene foam particles; a nanofiber; macroscopic organic fibers;
the cementing material is formed by compounding ordinary cement and quick-hardening cement, the early strength functional agent is 10-20 parts of quick-hardening cement, and the initial setting time of the quick-hardening cement is less than 45s;
the macroscopic organic fiber accounts for 0.01-0.05% of the volume of the slurry, has the length of 12-16 mm, the diameter of 18-40 microns and the tensile strength of 1400-1600 MPa; young modulus is more than or equal to 42GPa;
the polystyrene foam particles have a continuous gradation of 1-5 mm in particle size, and are 62-74% of the volume of the slurry.
2. The EPS insulation concrete material with high specific strength and light weight for 3D printing according to claim 1, characterized in that: the particle size range of the quartz sand is 100 to 1000 micrometers.
3. The EPS heat preservation concrete material with high specific strength and light weight for 3D printing as claimed in claim 1, wherein the nanofibers are plant-based nanocellulose aqueous dispersion, wherein the solid content of the nanofibers is 1.5 to 3.0%; the mass of the nano fiber is 1.0-3.0% of the mass of the cementing material.
4. The EPS insulation concrete material with high specific strength and light weight for 3D printing according to claim 1, characterized in that: the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent, and the water reducing rate is more than 30%; the water reducing agent accounts for 0.5-2.0% of the mass of the cementing material.
5. A preparation method of the high-specific-strength light EPS heat preservation concrete material for 3D printing according to any one of claims 1 to 4, characterized by comprising the following steps:
(1) Mixing macroscopic organic fibers with a cementing material, an early strength functional agent and quartz sand, and dry-mixing until the fibers are uniformly dispersed in the powder to obtain a mixed material;
(2) Mixing the nano-fiber, the water reducing agent and the mixing water, and stirring until a uniformly mixed suspension for mixing is obtained;
(3) Slowly pouring the suspension obtained in the step (2) into the mixed material obtained in the step (1), stirring at a low speed for 30-60s in a stirring pot, and then stirring at a high speed for 120-180s to obtain uniform slurry;
(4) Pouring the polystyrene foam particles into the slurry at a constant speed, stirring at a low speed for 60 to 120s, and then stirring at a high speed for 10 to 30s to obtain uniformly mixed slurry; and obtaining the high-specific-strength light EPS heat-insulation concrete material for 3D printing.
CN202210959920.0A 2022-08-11 2022-08-11 High-specific-strength light EPS heat-insulation concrete material for 3D printing and preparation method thereof Active CN115466084B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210959920.0A CN115466084B (en) 2022-08-11 2022-08-11 High-specific-strength light EPS heat-insulation concrete material for 3D printing and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210959920.0A CN115466084B (en) 2022-08-11 2022-08-11 High-specific-strength light EPS heat-insulation concrete material for 3D printing and preparation method thereof

Publications (2)

Publication Number Publication Date
CN115466084A CN115466084A (en) 2022-12-13
CN115466084B true CN115466084B (en) 2023-03-31

Family

ID=84366528

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210959920.0A Active CN115466084B (en) 2022-08-11 2022-08-11 High-specific-strength light EPS heat-insulation concrete material for 3D printing and preparation method thereof

Country Status (1)

Country Link
CN (1) CN115466084B (en)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104891891B (en) * 2015-05-06 2017-04-05 同济大学 A kind of 3D printing cement-based material and preparation method thereof
CN108249847A (en) * 2017-12-25 2018-07-06 芜湖林电子科技有限公司 A kind of 3D printing mortar of high compressive strength
CN115943085A (en) * 2018-10-08 2023-04-07 沙特阿拉伯石油公司 Cement-based direct writing ink for 3D printing of complex-architecture structural body
EP4217328A1 (en) * 2020-09-22 2023-08-02 Atlantis Holdings Ltd. Hybrid fiber reinforced cementitious material
CN114315288A (en) * 2022-01-27 2022-04-12 中交第一公路勘察设计研究院有限公司 Preparation method of 3D printing cement-based material and preparation method of cement-based printing component
CN114853402B (en) * 2022-04-20 2022-12-06 同济大学 Waste soil self-compounding technology-based regenerated powder-doped 3D printing engineering waste soil ink material and preparation method thereof

Also Published As

Publication number Publication date
CN115466084A (en) 2022-12-13

Similar Documents

Publication Publication Date Title
CN110776334B (en) Cement-based wallboard with large hollow rate and ultrahigh toughness and preparation method thereof
CN112694343B (en) High-strength heat-preservation sound-insulation gypsum-based self-leveling mortar and preparation method thereof
CN109776061B (en) Light high-strength type external wall internal thermal insulation gypsum and preparation method thereof
CN102765905B (en) EPS light aggregate concrete composite wall and its construction method
CN110105013A (en) A kind of high-strength cracking resistance foam concrete and preparation method thereof
CN107417202B (en) Foam concrete for wall sandwich layer and preparation method and application thereof
CN109678445B (en) Desulfurized gypsum 3D printing alkali-activated cementing material and using method thereof
CN111170698B (en) Regenerated glass fiber reinforced plastic anti-crack thermal insulation mortar and preparation and construction methods thereof
CN110818364B (en) Light high-strength waterproof concrete and preparation method thereof
CN105439615A (en) Foam concrete
CN108793869B (en) High-strength superfine ordinary silica cement-based self-leveling mortar and preparation method thereof
CN114292073B (en) Aeolian sand anti-freezing concrete capable of being printed in 3D mode and preparation method and using method thereof
CN114195463B (en) Concrete material for building 3D printing and preparation method thereof
CN112062515B (en) High-strength geopolymer closed-cell foam material prepared from silicon carbide and preparation method thereof
CN113831074A (en) Light sound-insulation terrace slurry containing polyurethane particles, preparation method and light sound-insulation terrace
CN108585927A (en) A kind of nano-cellulose aerogel thermal insulation board and preparation method thereof
CN113185224A (en) Novel building mortar taking iron tailing powder as raw material and preparation method thereof
CN113372069B (en) Light building sound insulation material based on fly ash
CN114014694A (en) Hydrophobic heat-preservation foam concrete prefabricated part and preparation method thereof
CN112321237A (en) Solid waste fly ash high-strength foam concrete and preparation method thereof
CN115466084B (en) High-specific-strength light EPS heat-insulation concrete material for 3D printing and preparation method thereof
CN109437802B (en) Sulphoaluminate cement assembled integrated inner wall and preparation method thereof
CN114685183B (en) Light foaming filling method
CN115010514B (en) Inorganic light foam concrete with high impermeability and low thermal conductivity and preparation method thereof
CN112010599A (en) Modified polyphenyl granule light concrete and preparation method thereof

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant