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A cement-based composite material suitable for 3D printing rapid prototyping process

A molding process and composite material technology, which is applied in the field of building materials, can solve problems such as abnormal condensation, strength reduction, and complex proportioning and composition, and achieve the effect of satisfying the setting time, high early strength, and increased strength

Active Publication Date: 2019-08-09
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with this material is that when sulfoaluminate and ordinary Portland cement are not compounded properly, there will be abnormal condensation, strength reduction and volume stability problems, which cannot meet the printing process requirements, and printing for buildings or constructions will have problems. Construction and Durability Issues
The proportion and composition of this material is complex, and the expansion agent used cannot be well maintained, and its shrinkage compensation effect cannot be exerted, so it is not suitable for printing large structural components and buildings
[0006] The above-mentioned published patent materials involved in 3D printing cement-based materials did not fully take into account the special requirements of the 3D printing process characteristics for materials, and the extrudability, stackability, printing time, hour The strength and durability are not detailed, and it does not reflect the technical advantages of 3D printing rapid prototyping

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) In parts by weight, weigh 100 parts of ordinary Portland cement of grade 42.5, 155 parts of fine aggregate, 0.08 part of Wenlun rubber, 1.5 parts of EVA redispersible latex powder, 0.9 part of sepiolite, and 10 parts of strong shrinkage reducing agent are put into a mixer and mixed to obtain ready-mixed dry powder.

[0034] (2) Fully stir and dissolve aluminum sulfate and water at a mass ratio of 1:1 to prepare a liquid as a liquid coagulation accelerator component. Weigh 0.7 parts of the liquid coagulation accelerator component for use.

[0035] (3) In parts by weight, 38 parts of mixing water were weighed, and 0.9 part of 40% polycarboxylate superplasticizer was added to the pre-mixed dry powder in step (1) and fully stirred and mixed.

[0036] (4) Pump the cement-based material prepared in step (3) to the construction 3D printer, add the liquid coagulation accelerator component prepared in step (2) at the extrusion port, stir and mix well, and then extrude suita...

Embodiment 2

[0040] (1) In parts by weight, weigh 100 parts of ordinary Portland cement of grade 52.5, 200 parts of fine aggregate, 20 parts of strength reducing agent, 6.0 parts of EVA redispersible latex powder, hydroxypropyl methyl Put 0.1 part of cellulose ether and 1.0 part of diatomaceous earth into a mixer and mix and stir to obtain a ready-mixed dry powder.

[0041] (2) Fully stir and dissolve aluminum sulfate, diethanolamine and water at a mass ratio of 4.5:0.5:5.0 to prepare a liquid as a liquid coagulation accelerator component. Weigh 2.4 parts of liquid coagulation accelerator components for later use.

[0042] (3) In parts by weight, weigh 35 parts of mixing water and 0.2 parts of polycarboxylate superplasticizer into the pre-mixed dry powder in step (1) and fully stir and mix.

[0043] (4) Pump the cement-based material prepared in step (3) to the construction 3D printer, add the liquid coagulation accelerator component prepared in step (2) at the extrusion port, stir and mi...

Embodiment 3

[0049] (1) In parts by weight, weigh 100 parts of ordinary Portland cement of 42.5R grade, 180 parts of fine aggregate, 10 parts of EVA redispersible latex powder, 0.02 parts of carboxymethyl cellulose, 14.00 parts of agent and 1.5 parts of polypropylene fiber were put into a blender and mixed to obtain ready-mixed dry powder.

[0050] (2) In terms of parts by mass, aluminum sulfate, diethanolamine and water are fully stirred and dissolved at a mass ratio of 3.5:1.5:5.0 to prepare a liquid as a liquid coagulation accelerator component. Weigh 2.5 parts of liquid coagulation accelerator components for later use

[0051] (3) In parts by weight, weigh 40 parts of mixing water and 0.07 parts of polycarboxylate superplasticizer into the pre-mixed dry powder in step (1) and fully stir and mix.

[0052] (4) Pump the cement-based material prepared in step (3) to the construction 3D printer, add the liquid coagulation accelerator component weighed in step (2) at the extrusion port, sti...

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Abstract

The invention relates to a cement-based composite material suitable for making a building structure and components through a 3D printing rapid-forming process. The cement-based composite material is characterized in that an extrudable property is good, a stacking property is good, printing time is controllable, and mechanical properties and durability are excellent. Regarding detailed properties, the material has good thixotropy, controllable condensing and hardening time and good adhesion, hour strength development is rapid, and strength growth is stable at the later stage, requirements for the 3D printing process and rapid construction can be met, and actual application of the 3D printing technology in the building industry is promoted easily. The cement-based composite material includes 100 parts of ordinary Portland cement, 100-300 parts of fine aggregate, 5-20 parts of strength-promoting shrinkage reducing agent, 30-60 parts of mixing water, 0.1-2.0 parts of water reducing agent, 0.5-15 parts of interface reinforcing agent, 0.05-0.2 part of thixotropic agent and 0.5-3.5 parts of liquid coagulating components.

Description

technical field [0001] The invention relates to the technical field of building materials, and further relates to a cement-based composite material suitable for a 3D printing rapid prototyping process. Background technique [0002] 3D printing (3 Dimensional printing) belongs to the category of "additive manufacturing" or "rapid prototyping" technology, which is different from the traditional manufacturing process of subtractive manufacturing and equal material manufacturing. The raw materials used for printing are no longer the ink used by traditional printers, but real raw materials. With the aid of computer software, a series of digital slices are completed for the object to be printed, and the target object is obtained by stacking and forming the thin slices through continuous printing layer by layer by the printer. [0003] The application of 3D printing technology in the construction industry is to pass cement-based materials through extrusion equipment, under the con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04B33Y70/00
CPCB33Y70/00C04B28/04C04B14/06C04B2103/0057C04B14/042C04B22/142C04B22/143C04B24/38C04B2103/302C04B24/383C04B16/0633
Inventor 王子明薛龙刘晓申和庆辛鹏浩
Owner BEIJING UNIV OF TECH
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