A kind of 3D printing cement-based material and preparation method thereof

A cement-based material and 3D printing technology, applied in the field of building materials, can solve problems affecting the connection between printing layers, poor extrusion performance and buildability, and hidden dangers in building safety, so as to achieve excellent buildability and improve work Good performance and construction performance

Active Publication Date: 2017-04-05
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this patent tests some conventional properties of cement-based materials such as setting time, compressive strength and vertical expansion rate, these properties are difficult to truly reflect the construction performance and buildability of printed materials in new construction methods, such as this material Sulphoaluminate cement is used as the main cementitious material, which can make the material have high early strength and rapid setting function. The setting time of the material is adjusted by the composite coagulant to make the setting time within the range of 10-60min. For In terms of general rapid method construction, it can basically meet the construction requirements, but for extrusion method printing construction, due to the rapid loss of fluidity of sulphoaluminate cement paste, it will lead to poor extrusion performance and buildability, and the material is extremely poor. It is easy to cause blockage during transportation and printing, and it will also seriously affect the connection performance between the printing layers, causing many defects between the printing layers and leaving a safety hazard for the building

Method used

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  • A kind of 3D printing cement-based material and preparation method thereof
  • A kind of 3D printing cement-based material and preparation method thereof
  • A kind of 3D printing cement-based material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046]

[0047]

[0048] Character alignment preparation method: Weigh various raw materials according to the formula, and add cement (P.II52.5R Portland cement), active admixture (ultrafine slag powder), water reducer (polycarboxylate water agent), early strength agent (calcium formate), coagulation regulator (sodium citrate), expansion agent (UEA expansion agent), binder (redispersible latex powder), air-entraining agent (saponin), plastic The agent (carboxymethyl cellulose), starch ether, and fiber (polypropylene fiber) are fully stirred evenly to obtain a powdery gelatinous material, which is packaged to form a product.

[0049] During on-site construction, weigh fine aggregate (medium sand with a fineness modulus of 2.5) and coarse aggregate (crushed stone with a particle size smaller than 10mm) in proportion, put them into a special mixer and mix them evenly with powdered cementitious materials, and mix them in 1000kg Add 110kg of water to the material and stir eve...

Embodiment 2

[0052]

[0053]

[0054] Preparation method: Weigh various raw materials according to the formula, and add cement (P.O 42.5 ordinary cement), active admixture (slag powder, fly ash), water reducer (naphthalene-based water reducer), and early strength to the mixer in sequence. agent (sodium metasilicate), coagulant (sodium citrate), expansion agent (ZY concrete expansion agent), binder (redispersible latex powder), air-entraining agent (sodium lauryl sulfate), Plasticizer (lignocellulose), water repellent (calcium stearate), starch ether, fiber (basalt fiber) are fully stirred evenly, and packaged to form a product.

[0055] During on-site construction, weigh fine aggregate (quartz sand of 10-60 mesh) and coarse aggregate (crushed stone with a particle size less than 10mm) in proportion, put them into a special mixer and mix them evenly with powdery cementitious materials, and add them to 1000kg of mixture Stir 120kg of water evenly to prepare the printed concrete mixture...

Embodiment 3

[0058]

[0059]

[0060] Preparation method: Weigh various raw materials according to the formula, and add cement (P.II52.5R Portland cement), active admixture (ultrafine slag powder, silicon powder), water reducer (polycarboxylic acid water reducer), early strength agent (sodium aluminate), expansion agent (UEA expansion agent, quicklime), binder (redispersible latex powder), air-entraining agent (saponin), plastic retainer (methyl hydroxy Propyl cellulose ether), water-repellent (calcium stearate), starch ether, and fiber (polypropylene fiber) are fully stirred evenly to obtain a powdery gelatinous material, which is packaged to form a product.

[0061] During on-site construction, weigh fine aggregate (medium sand with a fineness modulus of 2.5) and coarse aggregate (crushed stone with a particle size smaller than 10mm) in proportion, put them into a special mixer and mix them evenly with powdered cementitious materials, and mix them in 1000kg Add 105kg of water to th...

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Abstract

The invention relates to a 3D printing cement-based material and a preparation method thereof. The 3D printing cement-based material is composed of a powder form gelling material and an aggregate, the powder form gelling material is composed of cement, an active admixture, a water reducer, a hardening accelerator, an adjustable solidification agent, an expanding agent, a binder, an air-entrainer, a plasticity-maintaining agent, a water repellent, starch ether, a powder filling material and fiber, and the aggregate is composed of a fine aggregate and a crude aggregate. Compared with prior art, the 3D printing cement-based material has the advantages of good work performance, constructability performance, mechanical property and endurance performance.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a 3D printing cement-based material and a preparation method thereof. Background technique [0002] 3D printing technology is a technology that uses bondable materials such as powdered metal or plastic to construct objects by layer-by-layer printing based on digital model files. Now, 3D printing technology has begun to try to be used in the construction of houses. Compared with traditional construction technology, the advantages of 3D printing construction technology are reflected in: fast speed - more than 10 times faster than traditional construction technology; complex and diverse buildings that are difficult to build in traditional methods can be produced, and no need to use formwork, reducing construction cost. Cost; does not require a large number of construction workers, reducing safety risks during construction; and reduces waste by-products, can e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B28/08C04B14/02
Inventor 杨钱荣刘巧玲
Owner TONGJI UNIV
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