CN111718137A - Moderate-heat 3D printing cement and preparation method thereof - Google Patents
Moderate-heat 3D printing cement and preparation method thereof Download PDFInfo
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- CN111718137A CN111718137A CN201910225070.XA CN201910225070A CN111718137A CN 111718137 A CN111718137 A CN 111718137A CN 201910225070 A CN201910225070 A CN 201910225070A CN 111718137 A CN111718137 A CN 111718137A
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- belite sulphoaluminate
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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
- C04B7/00—Hydraulic cements
- C04B7/345—Hydraulic cements not provided for in one of the groups C04B7/02 - C04B7/34
- C04B7/3453—Belite cements, e.g. self-disintegrating cements based on dicalciumsilicate
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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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- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
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Abstract
The invention discloses moderate heat 3D printing cement which comprises, by weight, 85% -100% of moderate heat Portland cement and 0% -15% of high belite sulphoaluminate cement. The invention also discloses a preparation method of the moderate heat 3D printing cement, which comprises the following steps: weighing moderate heat portland cement; weighing high belite sulphoaluminate cement; and uniformly mixing the moderate heat Portland cement and the high belite sulphoaluminate cement to prepare the moderate heat 3D printing cement. The material prepared by the embodiment of the invention has the advantages of printability, strong cohesiveness, fast coagulability, low hydration heat, low adiabatic temperature rise and difficult cracking and deformation of a printed large-volume component, and well solves the problems of high hydration heat, high internal temperature, easy cracking and the like of the existing 3D printed cement printed large-volume component.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to moderate heat 3D printing cement and a preparation method thereof.
Background
With the continuous improvement of the technological level, the 3D printing technology is rapidly changing the production and living styles of people. In the construction industry, the "contour process" of 3D printing technology is applied, where a nozzle extrudes building material at a given location, as dictated by a design drawing, to build an object by printing layer by layer. Due to the layer-by-layer stacking construction mode, the 3D printing building has high requirements on workability, quick solidification, pressure resistance, fracture resistance and the like of printing materials. Therefore, the material is an important material basis for the development of the 3D printing technology, the realization of the building 3D printing technology cannot be separated from the material, and the development of the material determines whether the 3D printing technology can be widely applied or not to a great extent.
At present, in the field of 3D printing buildings, most of 3D printing materials for buildings are improvement and upgrading of concrete materials on the basis of traditional building raw materials. According to the principle of usability, constructability and economy of building materials, through modification and optimization of a cementing material system mainly comprising cement, mineral admixture, solid waste powder and the like, the key point of application of the current 3D printing technology in building engineering construction is to develop and develop moderate-heat 3D printing cement for buildings. However, the cement which can be used for 3D printing in building construction at the present stage is very short, on one hand, due to the particularity of the construction mode, the performance requirements of various aspects of the moderate-heat 3D printing cement are high, particularly the requirements on cement hydration heat, and on the other hand, the prepared moderate-heat 3D printing cement needs to be matched with the working parameters of a 3D printer.
Therefore, technical personnel in the field are dedicated to developing moderate heat 3D printing cement and a preparation method thereof, so that the prepared moderate heat 3D printing cement has printability, strong cohesiveness and fast coagulability, the moderate heat 3D printing cement can be smoothly sprayed out from a spray head of a printer, continuous printing can be carried out to stack the cement layer by layer, the cement can be fast coagulated, and meanwhile, the problems that the existing 3D printing cement for printing a large-volume component is deformed, and the internal and external temperature difference is large, so that the cement is cracked and the like are solved.
Disclosure of Invention
In view of the above defects in the prior art, the technical problem to be solved by the present invention is to provide a method for preparing moderate heat 3D printing cement, so that the prepared moderate heat 3D printing cement has printability, strong cohesiveness and fast coagulability, and can be smoothly sprayed out from a nozzle of a printer, so that the cement can be continuously printed to be stacked layer by layer and can be rapidly solidified, and meanwhile, the problems of deformation, cracking caused by large temperature difference between the inside and the outside of a large-volume component, and the like when the existing 3D cement is printed are solved.
In order to achieve the above object, the invention provides moderate heat 3D printing cement, which comprises the following components in percentage by weight:
85% -100% of moderate heat portland cement and 0% -15% of high belite sulphoaluminate cement;
wherein the strength grade of the moderate heat Portland cement is 42.5 grade, the 3-day hydration heat of the moderate heat Portland cement is between 220 and 250j/g, the 7-day hydration heat of the moderate heat Portland cement is between 270 and 290j/g, and the specific surface area of the moderate heat Portland cement is 200m2/kg-310m2Per kg, density 3.0m3/kg-3.5m3Per kg, the strength grade of the high belite sulphoaluminate cement is 42.5 grade, and the specific surface area of the high belite sulphoaluminate cement is 400m2/kg-650m2Per kg, density 2.8m3/kg-3.0m3/kg。
The invention also provides a preparation method of the moderate heat 3D printing cement, which comprises the following steps:
s100, weighing moderate heat portland cement;
s200, weighing the high belite sulphoaluminate cement;
s300, uniformly mixing the moderate heat Portland cement and the high belite sulphoaluminate cement to prepare moderate heat 3D printing cement.
The invention also provides application of the moderate heat 3D printing cement in a large-volume component with any direction larger than 500 mm.
The invention has the beneficial effects that:
in the process of preparing the moderate heat 3D printing cement, the embodiment of the invention achieves good constructability and printable effect by modifying and optimizing the cementing material system mainly comprising cement, mineral admixture, solid waste powder and the like and by fine selection and specific proportioning design, so that the prepared moderate heat 3D printing cement meets various performance requirements in the construction of constructional engineering.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
FIG. 1 is a flow chart of a method of making a preferred embodiment of the present invention.
Detailed Description
The technical contents of the preferred embodiments of the present invention will be more clearly and easily understood by referring to the drawings attached to the specification. The present invention may be embodied in many different forms of embodiments and the scope of the invention is not limited to the embodiments set forth herein.
The moderate heat 3D printing cement provided by the invention is prepared by uniformly mixing moderate heat Portland cement and high belite sulphoaluminate cement through specific proportioning design by taking the moderate heat Portland cement and the high belite sulphoaluminate cement as main raw materials.
The raw materials for preparing the moderate heat 3D printing cement comprise 85% -100% of moderate heat portland cement and 0% -15% of high belite sulphoaluminate cement, wherein the strength grade of the moderate heat portland cement is 42.5 grade, initial setting time is more than or equal to 60mins, final setting time is less than or equal to 300mins, and specific surface area is 200m2/kg-310m2Per kg, density 3.0m3/kg-3.5m3The hydration heat of 3d is between 220 and 250j/g, and the hydration heat of 7d is between 270 and 290 j/g; the specific surface area of the high belite sulphoaluminate cement is 400m2/kg-650m2Per kg, density 2.8m3/kg-3.0m3The strength grade is 42.5 grade, the initial setting time is more than or equal to 28mins, and the final setting time is less than or equal to 90 mins.
As shown in fig. 1, a flow chart of a manufacturing method according to a preferred embodiment of the present invention includes the following steps:
s100, weighing moderate heat portland cement;
s200, weighing the high belite sulphoaluminate cement;
s300, uniformly mixing the moderate heat Portland cement and the high belite sulphoaluminate cement to prepare moderate heat 3D printing cement.
And performing performance test on the obtained moderate heat 3D printed cement.
The tests comprise the steps of carrying out the tests on the compressive strength, the hydration heat of 3d and 7d of the material of the embodiment by referring to the national standard GB/T17671-1999 Cement mortar Strength test GB/T12959-2008 Cement hydration Heat determination method, and carrying out the tests on the extrusion performance and the construction performance of the material of the embodiment by using a cement mortar caulking gun.
The following is a detailed description of the embodiments and effects of the present invention by 8 examples.
Example 185% Medium Heat Portland Cement proportioning 15% high belite sulphoaluminate Cement
In the embodiment, the moderate heat portland cement and the high belite sulphoaluminate cement are uniformly mixed according to a certain proportion, wherein the moderate heat portland cement accounts for 85 percent, and the high belite sulphoaluminate cement accounts for 15 percent; wherein the strength grade of the portland cement is 42.5, and the strength grade of the high belite sulphoaluminate cement is 42.5; in the embodiment, moderate heat portland cement and high belite sulphoaluminate cement in the formula amount are stirred to obtain moderate heat 3D printing cement.
Example 287% Medium Heat Portland Cement blend 13% high belite sulphoaluminate Cement
In the embodiment, the moderate heat portland cement and the high belite sulphoaluminate cement are uniformly mixed according to a certain proportion, wherein the moderate heat portland cement accounts for 87 percent, and the high belite sulphoaluminate cement accounts for 13 percent; wherein the strength grade of the moderate heat portland cement is 42.5, and the strength grade of the high belite sulphoaluminate cement is 42.5; in the embodiment, moderate heat portland cement and high belite sulphoaluminate cement in the formula amount are stirred to obtain moderate heat 3D printing cement.
Example 389% Medium Heat Portland Cement blend 11% high belite sulphoaluminate Cement
In the embodiment, the moderate heat portland cement and the high belite sulphoaluminate cement are uniformly mixed according to a certain proportion, wherein the moderate heat portland cement accounts for 89 percent, and the high belite sulphoaluminate cement accounts for 11 percent; wherein the strength grade of the portland cement is 42.5, and the strength grade of the high belite sulphoaluminate cement is 42.5; in the embodiment, moderate heat portland cement and high belite sulphoaluminate cement in the formula amount are stirred to obtain moderate heat 3D printing cement.
Example 490% Medium Heat Portland Cement proportioning 10% high belite sulphoaluminate Cement
In the embodiment, the moderate heat portland cement and the high belite sulphoaluminate cement are uniformly mixed according to a certain proportion, wherein the moderate heat portland cement accounts for 90 percent, and the high belite sulphoaluminate cement accounts for 10 percent; wherein the strength grade of the portland cement is 42.5, and the strength grade of the high belite sulphoaluminate cement is 42.5; in the embodiment, moderate heat portland cement and high belite sulphoaluminate cement in the formula amount are stirred to obtain moderate heat 3D printing cement.
Example 592% moderate heat Portland Cement blend 8% high belite sulphoaluminate Cement
In the embodiment, the moderate heat portland cement and the high belite sulphoaluminate cement are uniformly mixed according to a certain proportion, wherein the moderate heat portland cement accounts for 92 percent, and the high belite sulphoaluminate cement accounts for 8 percent; wherein the strength grade of the portland cement is 42.5, and the strength grade of the high belite sulphoaluminate cement is 42.5; in the embodiment, moderate heat portland cement and high belite sulphoaluminate cement in the formula amount are stirred to obtain moderate heat 3D printing cement.
Example 695% moderate heat Portland Cement blend 5% high belite sulphoaluminate Cement
In the embodiment, the moderate heat portland cement and the high belite sulphoaluminate cement are uniformly mixed according to a certain proportion, wherein the moderate heat portland cement accounts for 95 percent, and the high belite sulphoaluminate cement accounts for 5 percent; wherein the strength grade of the portland cement is 42.5, and the strength grade of the high belite sulphoaluminate cement is 42.5; in the embodiment, moderate heat portland cement and high belite sulphoaluminate cement in the formula amount are stirred to obtain moderate heat 3D printing cement.
Example 797% Medium Heat Portland Cement blend 3% high belite sulphoaluminate Cement
In the embodiment, the moderate heat portland cement and the high belite sulphoaluminate cement are uniformly mixed according to a certain proportion, wherein the moderate heat portland cement accounts for 97 percent, and the high belite sulphoaluminate cement accounts for 3 percent; wherein the strength grade of the portland cement is 42.5, and the strength grade of the high belite sulphoaluminate cement is 42.5; in the embodiment, moderate heat portland cement and high belite sulphoaluminate cement in the formula amount are stirred to obtain moderate heat 3D printing cement.
Example 899% Medium Heat Portland Cement blend 1% high belite sulphoaluminate Cement
In the embodiment, the moderate heat portland cement and the high belite sulphoaluminate cement are uniformly mixed according to a certain proportion, wherein the moderate heat portland cement accounts for 99 percent, and the high belite sulphoaluminate cement accounts for 1 percent; wherein the strength grade of the portland cement is 42.5, and the strength grade of the high belite sulphoaluminate cement is 42.5; in the embodiment, moderate heat portland cement and high belite sulphoaluminate cement in the formula amount are stirred to obtain moderate heat 3D printing cement.
The criteria and methods for measuring the relevant properties of the above examples 1-8 are: the material of the embodiment is tested for compressive strength, hydration heat of 3d and hydration heat of 7d by referring to the national standard GB/T17671-1999 cement mortar strength test and GB/T12959-2008 cement hydration heat determination method, and the material of the embodiment is tested for extrusion simulation and constructability by using a cement mortar caulking gun, wherein:
preparing 3D printing concrete by using moderate heat 3D printing cement for extrusion test:
1) can continuously extrude 50cm without interruption and blockage, and does not generate bleeding and segregation;
2) the width of the extruded ribbon is not more than 1.2 times of the extruded caliber.
Preparing 3D printing concrete by using moderate heat 3D printing cement to perform a constructability test:
1) the longitudinal strain is less than 10 percent under the action of dead weight and is tested once every 1 or 0.5 minute;
2) the longitudinal strain is less than 20% when tested every 1 or 0.5 minutes under the action of 3 times of the self-weight pressure.
The results of the performance testing, extrudability and constructability tests on the moderate heat 3D-printed cements prepared in examples 1-8 are shown in tables 1 and 2:
TABLE 1 Hot 3D printing cement performance detection table
It can be seen from table 1 that in example 4, when the high belite sulphoaluminate cement is added in a proportion of 10%, the initial setting time and the final setting time are moderate in length and strength compared with those of examples 1 to 3 and examples 5 to 8, and therefore, the requirement of moderate-heat 3D printing cement can be better met.
TABLE 2 Hot 3D-PRINTED CEMENT EXTRUBILITY AND BUILDING TABLE
As can be seen from Table 2, the moderate heat 3D printing cement prepared in example 4 has the longest uninterrupted length of 60cm, the highest extrudability, the moderate setting time, the longitudinal strain of the prepared material under 3 times of self weight of less than 20%, the good constructability and the low heat of hydration. Meanwhile, as can be seen from examples 1, 2, 3, 6 and 7, too low or too high belite sulphoaluminate cement (or too high or too low content of medium heat silicate cement) causes problems of easy interruption of printing materials, low constructability and the like.
To sum up the data and analysis thereof in the table 1 and the table 2, the table 2 and the table for testing the extrudability and the constructability of the hot 3D printed cement, the hot 3D printed cement claimed in the present application can be applied to any large-volume component with the direction larger than 500 mm.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (5)
1. A moderate heat 3D printing cement, which comprises the following components in percentage by weight:
85% -100% of moderate heat portland cement and 0% -15% of high belite sulphoaluminate cement;
wherein the strength grade of the moderate heat Portland cement is 42.5 grade, the 3-day hydration heat of the moderate heat Portland cement is between 220 and 250j/g, the 7-day hydration heat of the moderate heat Portland cement is between 270 and 290j/g, and the specific surface area of the moderate heat Portland cement is 200m2/kg-310m2Per kg, density 3.0m3/kg-3.5m3Per kg, the strength grade of the high belite sulphoaluminate cement is 42.5 grade, and the specific surface area of the high belite sulphoaluminate cement is 400m2/kg-650m2Per kg, density 2.8m3/kg-3.0m3/kg。
2. The moderate heat 3D printing cement according to claim 1, wherein the moderate heat portland cement preferably has an initial setting time of 60mins or more and a final setting time of 300mins or less.
3. The moderate heat 3D printing cement as claimed in claim 1, wherein the high belite sulphoaluminate cement has an initial setting time of 28mins or more and a final setting time of 90mins or less.
4. The method for preparing a cement for medium thermal 3D printing according to any of claims 1 to 3, comprising the steps of:
s100, weighing moderate heat portland cement;
s200, weighing the high belite sulphoaluminate cement;
s300, uniformly mixing the moderate heat Portland cement and the high belite sulphoaluminate cement to prepare moderate heat 3D printing cement.
5. Use of the medium thermal 3D printing cement according to any of claims 1-3 in a high volume component of more than 500mm in any direction.
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| CN113149579A (en) * | 2021-05-07 | 2021-07-23 | 湖北工业大学 | Preparation method of super-gelling cement for 3D printing and super-gelling cement for 3D printing |
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