CN109534757B - Building 3D printing rapid prototyping composite material - Google Patents
Building 3D printing rapid prototyping composite material Download PDFInfo
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- CN109534757B CN109534757B CN201910028530.XA CN201910028530A CN109534757B CN 109534757 B CN109534757 B CN 109534757B CN 201910028530 A CN201910028530 A CN 201910028530A CN 109534757 B CN109534757 B CN 109534757B
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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
- 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
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
A building 3D printing rapid prototyping composite material. The composite material comprises the following raw materials in parts by weight: 450 parts of cement, 80-125 parts of slag micro powder, 540 parts of aggregate, 460-8 parts of water reducing agent, 1.0-1.9 parts of composite set control agent and 45-63 parts of volume stabilizer; the composite set retarder consists of a coagulant and a retarder, wherein the weight parts of the coagulant and the retarder are as follows: (0.4-0.8) parts of: (0.6-1.1) parts; the volume stabilizer consists of (25-35) parts of high-calcium fly ash and (20-28) parts of CSA expanding agent. The printing material prepared from the composite material provided by the invention has good cohesiveness and strong stability, and has good pump-out form retention capacity and cohesiveness, so that a printed building has good form and volume stability.
Description
Technical Field
The invention belongs to the field of building materials, and particularly relates to a building 3D printing rapid prototyping composite material.
Background
At present, the initial setting time of common building concrete for building 3D printing materials is 6-10 hours, and the curing time exceeds 24 hours, so that the requirement of 3D printing cannot be met. The gypsum-based building material has good quick-drying and strength in a spraying system, but the gypsum-based building material has many defects in 3D printing due to the reasons of fast setting time, high water absorption, easy deterioration and the like. The quick-drying cement is mainly used for 3D printing, the strength of the cement is excited by strong alkali, so that the strength of the cement can be increased, but later pulverization and the like are great problems. The performance requirement of rapid condensation of the material in a short time in the 3D printing process cannot be met; and generally, the material is flowable, and cannot meet the vertical stacking performance in the 3D printing process, so that the material cannot be used as a 3D printing material. The literature, namely preparation and application research of a cement-based building 3D printing material, provides a cement-based composite material suitable for building 3D printing, and solves the problem that most of materials used for a 3D printing technology in the prior art are organic materials; the technical problems that the existing common cement-based material is long in setting time, generally has fluidity, does not have thixotropic property and is not suitable for the 3D printing process are solved. However, the invention considers that the initial setting time of the cement-based building 3D printing material has too large control range, is not easy to grasp for general technicians, and cannot make intensive study on the volume stability of the cement-based building 3D printing material. Therefore, it is necessary to research a new building 3D printing rapid prototyping material.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a building 3D printing rapid prototyping composite material, and the composite material provided by the invention can ensure that the prepared printing material has good cohesiveness, strong stability and excellent mechanical property, so that the printed building keeps good shape and stable volume.
One of the purposes of the invention is to provide a building 3D printing rapid prototyping composite material.
The invention also aims to provide a use method of the building 3D printing rapid prototyping composite material.
The invention also aims to provide the building 3D printing rapid prototyping composite material and the application of the preparation method thereof.
In order to realize the purpose, the invention discloses the following technical scheme:
the invention discloses a building 3D printing rapid prototyping composite material which comprises the following raw materials in parts by weight: 450 parts of cement, 80-125 parts of slag micro powder, 540 parts of aggregate, 460-8 parts of water reducing agent, 1.0-1.9 parts of composite set control agent and 45-63 parts of volume stabilizer; the composite set retarder consists of a coagulant and a retarder, wherein the weight parts of the coagulant and the retarder are as follows: (0.4-0.8) parts of: (0.6-1.1) parts; the volume stabilizer consists of high-calcium fly ash and a CSA expanding agent, wherein the weight parts of the high-calcium fly ash and the CSA expanding agent are as follows: (25-35) parts: (20-28).
Further, the composite material comprises the following raw materials in parts by weight: 450 parts of cement, 80-100 parts of slag micro powder, 500 parts of aggregate 460, 0.4-0.8 part of water reducing agent, 1.4-1.8 parts of composite set control agent and 45-58 parts of volume stabilizer; the composite set control agent consists of a set accelerator and a set retarder, wherein the set accelerator is 0.6-0.8 part, and the set retarder is 0.8-1.0 part; the volume stabilizer consists of 30-33 parts of high-calcium fly ash and 25-28 parts of CSA (calcium silicate sulfate) expanding agent.
Further, the cement is sulphoaluminate cement, and the 42.5R quick-hardening sulphoaluminate cement is preferably used as a cementing material due to higher setting speed and higher early strength than common silicate.
Further, the fineness of the slag micro powder is 420-500m2The slag micro powder has the main functions of improving the early strength of cement and concrete and improving certain characteristics of the concrete, such as easiness in mixing, improvement of early strength, reduction of hydration heat and the like.
Further, the aggregate is composed of coarse aggregate and fine aggregate; preferably, the coarse aggregate is stone with the particle size of less than 5mm, and the fine aggregate is medium sand with the particle size of 0.25-0.5 mm.
Further, the water reducing agent is a polycarboxylic acid water reducing agent, such as: a polycarboxylic acid PC water reducing agent. The proper polycarboxylic acid water reducing agent is added in the preparation process of the concrete, so that a good water reducing effect can be achieved, and the loss in slump is relatively small; meanwhile, the water reducing agent and the cementing material have good adaptability, no toxic or side effect and no pollution, and can effectively improve the durability of concrete.
Further, in the composite set control agent, the setting accelerator is lithium carbonate, and the retarder is sodium tetraborate. The continuity and safety of 3D printing is mainly controlled by the coagulation time and intensity of the material, which is particularly important. The setting time of the material can be effectively controlled by using the setting accelerator and the retarder. The accelerating agent lithium carbonate has ideal accelerating effect, can improve the early strength while shortening the setting time, and has little influence on the later strength. The retarder sodium tetraborate is an ideal retarder for the quick-hardening sulphoaluminate cement, can play a role in retarding coagulation, can improve early strength, and has no adverse effect on 28-day strength.
The volume stabilizer consisting of the high-calcium fly ash and the CSA expanding agent provided by the invention can ensure that the prepared printing material has good cohesiveness and strong stability, and has good pump-out form retention capacity and cohesiveness, so that the printed building has good form and volume stability. This is because: the invention takes f-CaO hydration in the high-calcium fly ash as an expansion source, fully utilizes the expansion characteristic of the high-calcium fly ash on the premise of ensuring the qualified stability, can compensate plastic shrinkage and early chemical shrinkage of pumped concrete, forms uniform ettringite crystals after a CSA expanding agent is doped into cement to generate expansion action mainly in a crystallization stage, and has certain crystallization pressure and water absorption swelling deformation because crystal growth of the ettringite in the hydration hardening process penetrates through surrounding substances to grow outwards, and the ettringite is converted into the self-compressive stress of the cement under the constraint condition so as to ensure that the structure of the cement has better tensile deformation capability. After the CSA expanding agent is added, ettringite is generated in a cement hydration system and is filled in a water filling space in an original system, so that the cement stone is more compact, and the expansion efficiency is better exerted. After the CSA expanding agent is added, the pore content in a cement system is slightly increased, more unhydrated cement particles exist, and more non-grown ettringite crystals grow in a cross mode, so that the microstructure of the cement stone is more compact, and the mechanical property of the composite material is further improved.
The invention further discloses a using method of the building 3D printing rapid prototyping composite material, which comprises the following steps:
(1) placing cement, slag micro powder, aggregate and high-calcium fly ash into a dry powder stirrer, and uniformly stirring to form premixed dry powder;
(2) and (3) feeding the premixed dry powder into a stirring device, adding water, uniformly mixing, then adding a water reducing agent, a composite set control agent and a CSA expanding agent, and uniformly stirring to print.
Finally, the invention discloses the building 3D printing rapid prototyping composite material and the application of the preparation method thereof in the building field.
Compared with the prior art, the invention has the following beneficial effects:
(1) the volume stabilizer consisting of the high-calcium fly ash and the CSA expanding agent provided by the invention can ensure that the prepared printing material has good cohesiveness and strong stability, and has good pump-out form retention capacity and cohesiveness, so that the printed building has good form and volume stability.
(2) The building prepared by 3D printing through the composite material has short condensation time, good thixotropic property and high compressive strength, and is very suitable for 3D printing.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As introduced in the background art, the initial setting time of the common building concrete of the existing building 3D printing material is 6-10 hours, and the curing time exceeds 24 hours, so that the performance requirement of rapid setting of the material in a short time in the 3D printing process cannot be met. Therefore, the invention provides a building 3D printing rapid prototyping composite material, and the invention is further described with reference to the following specific embodiments.
In the following examples, the high calcium fly ash was obtained from Shandong Haishiki Xingsheng building materials Co; the slag micro powder is purchased from Shandong Changsheng source slag micro powder Co.
Example 1
1. The building 3D printing rapid prototyping composite material comprises the following raw materials in parts by weight:
400 parts of 42.5R quick-hardening sulphoaluminate cement;
80 parts of slag micro powder with the fineness of 450m2/kg；
200 parts of coarse aggregate (stones with the particle size of less than 5 mm);
300 parts of fine aggregate (medium sand with the particle size of 0.25-0.5 mm);
0.8 part of a polycarboxylic acid PC water reducing agent;
a composite set control agent consisting of 0.6 part of lithium carbonate and 0.8 part of sodium tetraborate;
the volume stabilizer consists of 30 parts of high-calcium fly ash and 28 parts of CSA expanding agent.
2. The method for preparing the 3D printing building by simulating the building 3D printing rapid prototyping composite material comprises the following steps:
(1) putting the cement, the slag micro powder, the aggregate and the high-calcium fly ash into a dry powder stirrer according to the proportion, and uniformly stirring to form premixed dry powder;
(2) feeding the premixed dry powder into a stirring device, adding water (the water-cement ratio is 0.35), stirring for 40s, then adding a water reducing agent, a composite set control agent and a CSA (controlled release aqueous epoxy resin) expanding agent, and stirring for 30s to obtain printing slurry;
(3) and (4) placing the printing paste in the step (3) into an extruder, wherein the rotating speed of the extruder is 400r/s, and thus obtaining the printing paste.
Example 2
1. The building 3D printing rapid prototyping composite material comprises the following raw materials in parts by weight:
450 parts of 42.5R quick-hardening sulphoaluminate cement;
100 parts of slag micro powder with the fineness of 500m2/kg；
220 parts of coarse aggregate (stones with the particle size of less than 5 mm);
240 parts of fine aggregate (medium sand with the particle size of 0.25-0.5 mm);
0.4 part of a polycarboxylic acid PC water reducing agent;
a composite set control agent consisting of 0.8 part of lithium carbonate and 1.0 part of sodium tetraborate;
a volume stabilizer consisting of 33 parts of high calcium fly ash and 25 parts of CSA expanding agent.
2. The method for preparing the 3D printing building by simulating the building 3D printing rapid prototyping composite material comprises the following steps:
(1) putting the cement, the slag micro powder, the aggregate and the high-calcium fly ash into a dry powder stirrer according to the proportion, and uniformly stirring to form premixed dry powder;
(2) feeding the premixed dry powder into a stirring device, adding water (the water-cement ratio is 0.32), stirring for 30s, then adding a water reducing agent, a composite set control agent and a CSA (controlled release aqueous epoxy resin) expanding agent, and stirring for 30s to obtain printing slurry;
(3) and (4) placing the printing paste in the step (3) into an extruder, wherein the rotating speed of the extruder is 350r/s, and thus obtaining the printing paste.
Example 3
1. The building 3D printing rapid prototyping composite material comprises the following raw materials in parts by weight:
300 parts of 42.5R quick-hardening sulphoaluminate cement;
125 parts of slag micro powder with the fineness of 500m2/kg；
250 parts of coarse aggregate (stones with the particle size of less than 5 mm);
290 parts of fine aggregate (medium sand with the particle size of 0.25-0.5 mm);
0.2 part of a polycarboxylic acid PC water reducing agent;
a composite set control agent consisting of 0.4 part of lithium carbonate and 0.6 part of sodium tetraborate;
the volume stabilizer consists of 25 parts of high-calcium fly ash and 20 parts of CSA expanding agent.
2. The method for preparing the 3D printing building by simulating the building 3D printing rapid prototyping composite material comprises the following steps:
(1) putting the cement, the slag micro powder, the aggregate and the high-calcium fly ash into a dry powder stirrer according to the proportion, and uniformly stirring to form premixed dry powder;
(2) feeding the premixed dry powder into a stirring device, adding water (the water-cement ratio is 0.32), stirring for 30s, then adding a water reducing agent, a composite set control agent and a CSA (controlled release aqueous epoxy resin) expanding agent, and stirring for 30s to obtain printing slurry;
(3) and (4) placing the printing paste in the step (3) into an extruder, wherein the rotating speed of the extruder is 300r/s, and thus obtaining the printing paste.
Example 4
1. The building 3D printing rapid prototyping composite material comprises the following raw materials in parts by weight:
420 parts of 42.5R quick-hardening sulphoaluminate cement;
90 parts of slag micro powder with the fineness of 420m2/kg；
200 parts of coarse aggregate (stones with the particle size of less than 5 mm);
320 parts of fine aggregate (medium sand with the particle size of 0.25-0.5 mm);
0.6 part of a polycarboxylic acid PC water reducing agent;
a composite set control agent consisting of 0.8 part of lithium carbonate and 1.1 part of sodium tetraborate;
the volume stabilizer consists of 35 parts of high-calcium fly ash and 28 parts of CSA expanding agent.
2. The method for preparing the 3D printing building by simulating the building 3D printing rapid prototyping composite material comprises the following steps:
(1) putting the cement, the slag micro powder, the aggregate and the high-calcium fly ash into a dry powder stirrer according to the proportion, and uniformly stirring to form premixed dry powder;
(2) feeding the premixed dry powder into a stirring device, adding water (the water-cement ratio is 0.32), stirring for 30s, then adding a water reducing agent, a composite set control agent and a CSA (controlled release aqueous epoxy resin) expanding agent, and stirring for 30s to obtain printing slurry;
(3) and (4) placing the printing paste in the step (3) into an extruder, wherein the rotating speed of the extruder is 500r/s, and thus obtaining the printing paste.
Experimental example 1
1. The building 3D printing rapid prototyping composite material comprises the following raw materials in parts by weight:
400 parts of 42.5R quick-hardening sulphoaluminate cement;
80 parts of slag micro powder with the fineness of 450m2/kg；
200 parts of coarse aggregate (stones with the particle size of less than 5 mm);
300 parts of fine aggregate (medium sand with the particle size of 0.25-0.5 mm);
0.8 part of a polycarboxylic acid PC water reducing agent;
and the composite set control agent consists of 0.6 part of lithium carbonate and 0.8 part of sodium tetraborate.
Experimental example 2
1. The building 3D printing rapid prototyping composite material comprises the following raw materials in parts by weight:
400 parts of 42.5R quick-hardening sulphoaluminate cement;
80 parts of slag micro powder with the fineness of 450m2/kg；
200 parts of coarse aggregate (stones with the particle size of less than 5 mm);
300 parts of fine aggregate (medium sand with the particle size of 0.25-0.5 mm);
0.8 part of a polycarboxylic acid PC water reducing agent;
and the composite set control agent consists of 0.6 part of lithium carbonate and 0.8 part of sodium tetraborate.
A volume stabilizer consisting of 30 parts of high calcium fly ash.
Experimental example 3
1. The building 3D printing rapid prototyping composite material comprises the following raw materials in parts by weight:
400 parts of 42.5R quick-hardening sulphoaluminate cement;
80 parts of slag micro powder with the fineness of 450m2/kg；
200 parts of coarse aggregate (stones with the particle size of less than 5 mm);
300 parts of fine aggregate (medium sand with the particle size of 0.25-0.5 mm);
0.8 part of a polycarboxylic acid PC water reducing agent;
volume stabilizer consisting of 28 parts of CSA bulking agent.
And (3) performance detection:
(1) the performance of the samples prepared from the building 3D printing rapid prototyping composite materials of examples 1-4 and test examples 1-3 was tested using the national standard GB/T50080 standard for the test methods for the performance of common concrete mixtures, and the results are shown in table 1.
TABLE 1
(2) The architectural 3D printed rapid prototyping composites of examples 1-3 were tested for volumetric stability and the results are shown in table 2.
TABLE 2
As can be seen from the table 2, the building 3D printing rapid prototyping composite material of the invention has good volume stability, because the invention takes f-CaO hydration in the high-calcium fly ash as an expansion source, fully utilizes the expansion characteristic of the high-calcium fly ash, can compensate plastic shrinkage and early chemical shrinkage of the pumped concrete, and generates ettringite in a cement hydration system after being doped with CSA expanding agent, and fills a water filling space in a protosystem, so that the cement stone is more compact, and the expansion efficiency is better exerted.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (11)
1. The utility model provides a building 3D prints rapid prototyping combined material which characterized in that: the composite material comprises the following raw materials in parts by weight:
300 portions of cement and 450 portions of cement,
80-125 parts of slag micro-powder,
460 and 540 parts of aggregate,
0.2 to 0.8 portion of water reducing agent,
1.0-1.9 parts of composite set control agent, and
45-63 parts of volume stabilizer;
the composite set control agent is composed of a set accelerator and a set retarder, wherein the set accelerator is lithium carbonate, the set retarder is sodium tetraborate, and the weight parts of the set accelerator and the set retarder are as follows: 0.4-0.8 part: 0.6-1.1 parts;
the volume stabilizer consists of high-calcium fly ash and a CSA expanding agent, and the weight parts of the high-calcium fly ash and the CSA expanding agent are as follows: 25-35 parts of: 20-28 parts.
2. The architectural 3D printing rapid prototyping composite material of claim 1, wherein: the composite material comprises the following raw materials in parts by weight:
400 portions of cement and 450 portions of cement,
80-100 parts of slag micro-powder,
460 and 500 portions of aggregate,
0.4 to 0.8 portion of water reducing agent,
1.4-1.8 parts of composite set control agent, and
45-58 parts of volume stabilizer;
the composite set retarder consists of a set accelerator and a set retarder, wherein the set accelerator is 0.6-0.8 part, and the set retarder is 0.8-1.0 part;
the volume stabilizer consists of 30-33 parts of high-calcium fly ash and 25-28 parts of CSA (calcium silicate sulfate) expanding agent.
3. The architectural 3D printing rapid prototyping composite of claim 1 or 2, wherein: the cement is sulphoaluminate cement.
4. The architectural 3D printing rapid prototyping composite of claim 3, wherein: the cement is 42.5R quick hardening sulphoaluminate cement.
5. The architectural 3D printing rapid prototyping composite of claim 1 or 2, wherein: the fineness of the slag micro powder is 420-500m2/kg。
6. The architectural 3D printing rapid prototyping composite of claim 1 or 2, wherein: the aggregate is composed of coarse aggregate and fine aggregate.
7. The architectural 3D printing rapid prototyping composite material of claim 6, wherein: the coarse aggregate is stone with the particle size of less than 5mm, and the fine aggregate is medium sand with the particle size of 0.25-0.5 mm.
8. The architectural 3D printing rapid prototyping composite of claim 1 or 2, wherein: the water reducing agent is a polycarboxylic acid water reducing agent.
9. The architectural 3D printing rapid prototyping composite of claim 1 or 2, wherein: the water reducing agent is a polycarboxylic acid PC water reducing agent.
10. Use of the building 3D printing rapid prototyping composite material as set forth in any one of claims 1-9, wherein: the method comprises the following steps:
(1) placing cement, slag micro powder, aggregate and high-calcium fly ash into a dry powder stirrer, and uniformly stirring to form premixed dry powder;
(2) and (3) feeding the premixed dry powder into a stirring device, adding water, uniformly mixing, then adding a water reducing agent, a composite set control agent and a CSA expanding agent, and uniformly stirring to print.
11. Use of the architectural 3D printed rapid prototyping composite material of any one of claims 1-9 in the field of construction.
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| CN110528884B (en) * | 2019-08-30 | 2020-08-04 | 山东大学 | 3D printing device and method suitable for small concrete member and application |
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